diff --git a/crypto_sign/sphincs-shake256-128f-simple/META.yml b/crypto_sign/sphincs-shake256-128f-simple/META.yml
new file mode 100644
index 00000000..d130eaed
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/META.yml
@@ -0,0 +1,27 @@
+name: SPHINCS+
+type: signature
+claimed-nist-level: 1
+length-public-key: 32
+length-signature: 16976
+testvectors-sha256: a14cb8e4f149493fc5979e465e09ce943e8d669186ff5c7c3d11239fa869def6
+principal-submitter: Andreas Hülsing
+auxiliary-submitters:
+ - Jean-Philippe Aumasson
+ - Daniel J. Bernstein,
+ - Christoph Dobraunig
+ - Maria Eichlseder
+ - Scott Fluhrer
+ - Stefan-Lukas Gazdag
+ - Panos Kampanakis
+ - Stefan Kölbl
+ - Tanja Lange
+ - Martin M. Lauridsen
+ - Florian Mendel
+ - Ruben Niederhagen
+ - Christian Rechberger
+ - Joost Rijneveld
+ - Peter Schwabe
+implementations:
+ - name: clean
+ version: https://github.com/sphincs/sphincsplus/commit/492ec4f1f6d3b3dc4b435783bbaaf4e41cdb6f32
+ length-secret-key: 64
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/LICENSE b/crypto_sign/sphincs-shake256-128f-simple/clean/LICENSE
new file mode 100644
index 00000000..670154e3
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/LICENSE
@@ -0,0 +1,116 @@
+CC0 1.0 Universal
+
+Statement of Purpose
+
+The laws of most jurisdictions throughout the world automatically confer
+exclusive Copyright and Related Rights (defined below) upon the creator and
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+ vii. other similar, equivalent or corresponding rights throughout the world
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+2. Waiver. To the greatest extent permitted by, but not in contravention of,
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+any other legal or equitable action to disrupt the quiet enjoyment of the Work
+by the public as contemplated by Affirmer's express Statement of Purpose.
+
+3. Public License Fallback. Should any part of the Waiver for any reason be
+judged legally invalid or ineffective under applicable law, then the Waiver
+shall be preserved to the maximum extent permitted taking into account
+Affirmer's express Statement of Purpose. In addition, to the extent the Waiver
+is so judged Affirmer hereby grants to each affected person a royalty-free,
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+unconditional license to exercise Affirmer's Copyright and Related Rights in
+the Work (i) in all territories worldwide, (ii) for the maximum duration
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+Copyright and Related Rights in the Work or (ii) assert any associated claims
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+4. Limitations and Disclaimers.
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+ a. No trademark or patent rights held by Affirmer are waived, abandoned,
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+For more information, please see
+
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile b/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile
new file mode 100644
index 00000000..cdb3195d
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile
@@ -0,0 +1,22 @@
+# This Makefile can be used with GNU Make or BSD Make
+
+LIB=libsphincs-shake256-128f-simple_clean.a
+HASH = shake256
+THASH = simple
+
+HEADERS = params.h address.h wots.h utils.h fors.h api.h hash.h thash.h
+OBJECTS = address.o wots.o utils.o fors.o sign.o hash_shake256.o thash_shake256_simple.o
+
+CFLAGS=-Wall -Wextra -Wpedantic -Werror -std=c99 -I../../../common $(EXTRAFLAGS)
+
+all: $(LIB)
+
+%.o: %.c $(HEADERS)
+ $(CC) $(CFLAGS) -c -o $@ $<
+
+$(LIB): $(OBJECTS)
+ $(AR) -r $@ $(OBJECTS)
+
+clean:
+ $(RM) $(OBJECTS)
+ $(RM) $(LIB)
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile.Microsoft_nmake b/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile.Microsoft_nmake
new file mode 100644
index 00000000..12936213
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/Makefile.Microsoft_nmake
@@ -0,0 +1,19 @@
+# This Makefile can be used with Microsoft Visual Studio's nmake using the command:
+# nmake /f Makefile.Microsoft_nmake
+
+LIBRARY=libsphincs-shake256-128f-simple_clean.lib
+OBJECTS=address.obj wots.obj utils.obj fors.obj sign.obj hash_shake256.obj thash_shake256_simple.obj
+
+CFLAGS=/nologo /I ..\..\..\common /W4 /WX
+
+all: $(LIBRARY)
+
+# Make sure objects are recompiled if headers change.
+$(OBJECTS): *.h
+
+$(LIBRARY): $(OBJECTS)
+ LIB.EXE /NOLOGO /WX /OUT:$@ $**
+
+clean:
+ -DEL $(OBJECTS)
+ -DEL $(LIBRARY)
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/address.c b/crypto_sign/sphincs-shake256-128f-simple/clean/address.c
new file mode 100644
index 00000000..50badab5
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/address.c
@@ -0,0 +1,80 @@
+#include
+
+#include "params.h"
+#include "utils.h"
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_addr_to_bytes(
+ unsigned char *bytes, const uint32_t addr[8]) {
+ int i;
+
+ for (i = 0; i < 8; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ull_to_bytes(
+ bytes + i * 4, 4, addr[i]);
+ }
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_layer_addr(
+ uint32_t addr[8], uint32_t layer) {
+ addr[0] = layer;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(
+ uint32_t addr[8], uint64_t tree) {
+ #if (SPX_TREE_HEIGHT * (SPX_D - 1)) > 64
+#error Subtree addressing is currently limited to at most 2^64 trees
+ #endif
+ addr[1] = 0;
+ addr[2] = (uint32_t) (tree >> 32);
+ addr[3] = (uint32_t) tree;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ uint32_t addr[8], uint32_t type) {
+ addr[4] = type;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_subtree_addr(
+ uint32_t out[8], const uint32_t in[8]) {
+ out[0] = in[0];
+ out[1] = in[1];
+ out[2] = in[2];
+ out[3] = in[3];
+}
+
+/* These functions are used for OTS addresses. */
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ uint32_t addr[8], uint32_t keypair) {
+ addr[5] = keypair;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ uint32_t out[8], const uint32_t in[8]) {
+ out[0] = in[0];
+ out[1] = in[1];
+ out[2] = in[2];
+ out[3] = in[3];
+ out[5] = in[5];
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_chain_addr(
+ uint32_t addr[8], uint32_t chain) {
+ addr[6] = chain;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_hash_addr(
+ uint32_t addr[8], uint32_t hash) {
+ addr[7] = hash;
+}
+
+/* These functions are used for all hash tree addresses (including FORS). */
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(
+ uint32_t addr[8], uint32_t tree_height) {
+ addr[6] = tree_height;
+}
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ uint32_t addr[8], uint32_t tree_index) {
+ addr[7] = tree_index;
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/address.h b/crypto_sign/sphincs-shake256-128f-simple/clean/address.h
new file mode 100644
index 00000000..16666c00
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/address.h
@@ -0,0 +1,50 @@
+#ifndef SPX_ADDRESS_H
+#define SPX_ADDRESS_H
+
+#include
+
+#define SPX_ADDR_TYPE_WOTS 0
+#define SPX_ADDR_TYPE_WOTSPK 1
+#define SPX_ADDR_TYPE_HASHTREE 2
+#define SPX_ADDR_TYPE_FORSTREE 3
+#define SPX_ADDR_TYPE_FORSPK 4
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_addr_to_bytes(
+ unsigned char *bytes, const uint32_t addr[8]);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_layer_addr(
+ uint32_t addr[8], uint32_t layer);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(
+ uint32_t addr[8], uint64_t tree);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ uint32_t addr[8], uint32_t type);
+
+/* Copies the layer and tree part of one address into the other */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_subtree_addr(
+ uint32_t out[8], const uint32_t in[8]);
+
+/* These functions are used for WOTS and FORS addresses. */
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ uint32_t addr[8], uint32_t keypair);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_chain_addr(
+ uint32_t addr[8], uint32_t chain);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_hash_addr(
+ uint32_t addr[8], uint32_t hash);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ uint32_t out[8], const uint32_t in[8]);
+
+/* These functions are used for all hash tree addresses (including FORS). */
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(
+ uint32_t addr[8], uint32_t tree_height);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ uint32_t addr[8], uint32_t tree_index);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/api.h b/crypto_sign/sphincs-shake256-128f-simple/clean/api.h
new file mode 100644
index 00000000..23f7d77b
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/api.h
@@ -0,0 +1,80 @@
+#ifndef PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_API_H
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_API_H
+
+#include
+#include
+
+#include "params.h"
+
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_ALGNAME "SPHINCS+"
+
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SECRETKEYBYTES 64
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_PUBLICKEYBYTES 32
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_BYTES 16976
+#define PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SEEDBYTES 48
+
+/*
+ * Returns the length of a secret key, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_secretkeybytes(void);
+
+/*
+ * Returns the length of a public key, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_publickeybytes(void);
+
+/*
+ * Returns the length of a signature, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_bytes(void);
+
+/*
+ * Returns the length of the seed required to generate a key pair, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_seedbytes(void);
+
+/*
+ * Generates a SPHINCS+ key pair given a seed.
+ * Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
+ * Format pk: [root || PUB_SEED]
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_seed_keypair(
+ uint8_t *pk, uint8_t *sk, const uint8_t *seed);
+
+/*
+ * Generates a SPHINCS+ key pair.
+ * Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
+ * Format pk: [root || PUB_SEED]
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_keypair(
+ uint8_t *pk, uint8_t *sk);
+
+/**
+ * Returns an array containing a detached signature.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_signature(
+ uint8_t *sig, size_t *siglen,
+ const uint8_t *m, size_t mlen, const uint8_t *sk);
+
+/**
+ * Verifies a detached signature and message under a given public key.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_verify(
+ const uint8_t *sig, size_t siglen,
+ const uint8_t *m, size_t mlen, const uint8_t *pk);
+
+/**
+ * Returns an array containing the signature followed by the message.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign(
+ uint8_t *sm, size_t *smlen,
+ const uint8_t *m, size_t mlen, const uint8_t *sk);
+
+/**
+ * Verifies a given signature-message pair under a given public key.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_open(
+ uint8_t *m, size_t *mlen,
+ const uint8_t *sm, size_t smlen, const uint8_t *pk);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/fors.c b/crypto_sign/sphincs-shake256-128f-simple/clean/fors.c
new file mode 100644
index 00000000..6eacf1a3
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/fors.c
@@ -0,0 +1,165 @@
+#include
+#include
+#include
+
+#include "address.h"
+#include "fors.h"
+#include "hash.h"
+#include "thash.h"
+#include "utils.h"
+
+static void fors_gen_sk(unsigned char *sk, const unsigned char *sk_seed,
+ uint32_t fors_leaf_addr[8]) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_prf_addr(
+ sk, sk_seed, fors_leaf_addr);
+}
+
+static void fors_sk_to_leaf(unsigned char *leaf, const unsigned char *sk,
+ const unsigned char *pub_seed,
+ uint32_t fors_leaf_addr[8]) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ leaf, sk, 1, pub_seed, fors_leaf_addr);
+}
+
+static void fors_gen_leaf(unsigned char *leaf, const unsigned char *sk_seed,
+ const unsigned char *pub_seed,
+ uint32_t addr_idx, const uint32_t fors_tree_addr[8]) {
+ uint32_t fors_leaf_addr[8] = {0};
+
+ /* Only copy the parts that must be kept in fors_leaf_addr. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ fors_leaf_addr, fors_tree_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ fors_leaf_addr, SPX_ADDR_TYPE_FORSTREE);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ fors_leaf_addr, addr_idx);
+
+ fors_gen_sk(leaf, sk_seed, fors_leaf_addr);
+ fors_sk_to_leaf(leaf, leaf, pub_seed, fors_leaf_addr);
+}
+
+/**
+ * Interprets m as SPX_FORS_HEIGHT-bit unsigned integers.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ * Assumes indices has space for SPX_FORS_TREES integers.
+ */
+static void message_to_indices(uint32_t *indices, const unsigned char *m) {
+ unsigned int i, j;
+ unsigned int offset = 0;
+
+ for (i = 0; i < SPX_FORS_TREES; i++) {
+ indices[i] = 0;
+ for (j = 0; j < SPX_FORS_HEIGHT; j++) {
+ indices[i] ^= ((m[offset >> 3] >> (offset & 0x7)) & 0x1) << j;
+ offset++;
+ }
+ }
+}
+
+/**
+ * Signs a message m, deriving the secret key from sk_seed and the FTS address.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_sign(
+ unsigned char *sig, unsigned char *pk,
+ const unsigned char *m,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ const uint32_t fors_addr[8]) {
+ uint32_t indices[SPX_FORS_TREES];
+ unsigned char roots[SPX_FORS_TREES * SPX_N];
+ uint32_t fors_tree_addr[8] = {0};
+ uint32_t fors_pk_addr[8] = {0};
+ uint32_t idx_offset;
+ unsigned int i;
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ fors_tree_addr, fors_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ fors_pk_addr, fors_addr);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ fors_tree_addr, SPX_ADDR_TYPE_FORSTREE);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ fors_pk_addr, SPX_ADDR_TYPE_FORSPK);
+
+ message_to_indices(indices, m);
+
+ for (i = 0; i < SPX_FORS_TREES; i++) {
+ idx_offset = i * (1 << SPX_FORS_HEIGHT);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(
+ fors_tree_addr, 0);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ fors_tree_addr, indices[i] + idx_offset);
+
+ /* Include the secret key part that produces the selected leaf node. */
+ fors_gen_sk(sig, sk_seed, fors_tree_addr);
+ sig += SPX_N;
+
+ /* Compute the authentication path for this leaf node. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash(
+ roots + i * SPX_N, sig, sk_seed, pub_seed,
+ indices[i], idx_offset, SPX_FORS_HEIGHT, fors_gen_leaf,
+ fors_tree_addr);
+ sig += SPX_N * SPX_FORS_HEIGHT;
+ }
+
+ /* Hash horizontally across all tree roots to derive the public key. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ pk, roots, SPX_FORS_TREES, pub_seed, fors_pk_addr);
+}
+
+/**
+ * Derives the FORS public key from a signature.
+ * This can be used for verification by comparing to a known public key, or to
+ * subsequently verify a signature on the derived public key. The latter is the
+ * typical use-case when used as an FTS below an OTS in a hypertree.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_pk_from_sig(
+ unsigned char *pk,
+ const unsigned char *sig, const unsigned char *m,
+ const unsigned char *pub_seed, const uint32_t fors_addr[8]) {
+ uint32_t indices[SPX_FORS_TREES];
+ unsigned char roots[SPX_FORS_TREES * SPX_N];
+ unsigned char leaf[SPX_N];
+ uint32_t fors_tree_addr[8] = {0};
+ uint32_t fors_pk_addr[8] = {0};
+ uint32_t idx_offset;
+ unsigned int i;
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ fors_tree_addr, fors_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ fors_pk_addr, fors_addr);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ fors_tree_addr, SPX_ADDR_TYPE_FORSTREE);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ fors_pk_addr, SPX_ADDR_TYPE_FORSPK);
+
+ message_to_indices(indices, m);
+
+ for (i = 0; i < SPX_FORS_TREES; i++) {
+ idx_offset = i * (1 << SPX_FORS_HEIGHT);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(
+ fors_tree_addr, 0);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ fors_tree_addr, indices[i] + idx_offset);
+
+ /* Derive the leaf from the included secret key part. */
+ fors_sk_to_leaf(leaf, sig, pub_seed, fors_tree_addr);
+ sig += SPX_N;
+
+ /* Derive the corresponding root node of this tree. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_compute_root(
+ roots + i * SPX_N, leaf, indices[i], idx_offset, sig,
+ SPX_FORS_HEIGHT, pub_seed, fors_tree_addr);
+ sig += SPX_N * SPX_FORS_HEIGHT;
+ }
+
+ /* Hash horizontally across all tree roots to derive the public key. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ pk, roots, SPX_FORS_TREES, pub_seed, fors_pk_addr);
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/fors.h b/crypto_sign/sphincs-shake256-128f-simple/clean/fors.h
new file mode 100644
index 00000000..089f09c0
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/fors.h
@@ -0,0 +1,30 @@
+#ifndef SPX_FORS_H
+#define SPX_FORS_H
+
+#include
+
+#include "params.h"
+
+/**
+ * Signs a message m, deriving the secret key from sk_seed and the FTS address.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_sign(
+ unsigned char *sig, unsigned char *pk,
+ const unsigned char *m,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ const uint32_t fors_addr[8]);
+
+/**
+ * Derives the FORS public key from a signature.
+ * This can be used for verification by comparing to a known public key, or to
+ * subsequently verify a signature on the derived public key. The latter is the
+ * typical use-case when used as an FTS below an OTS in a hypertree.
+ * Assumes m contains at least SPX_FORS_HEIGHT * SPX_FORS_TREES bits.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_pk_from_sig(
+ unsigned char *pk,
+ const unsigned char *sig, const unsigned char *m,
+ const unsigned char *pub_seed, const uint32_t fors_addr[8]);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/hash.h b/crypto_sign/sphincs-shake256-128f-simple/clean/hash.h
new file mode 100644
index 00000000..aa2c0e97
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/hash.h
@@ -0,0 +1,22 @@
+#ifndef SPX_HASH_H
+#define SPX_HASH_H
+
+#include
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function(
+ const unsigned char *pub_seed, const unsigned char *sk_seed);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_prf_addr(
+ unsigned char *out, const unsigned char *key, const uint32_t addr[8]);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_gen_message_random(
+ unsigned char *R,
+ const unsigned char *sk_prf, const unsigned char *optrand,
+ const unsigned char *m, unsigned long long mlen);
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_hash_message(
+ unsigned char *digest, uint64_t *tree, uint32_t *leaf_idx,
+ const unsigned char *R, const unsigned char *pk,
+ const unsigned char *m, unsigned long long mlen);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/hash_shake256.c b/crypto_sign/sphincs-shake256-128f-simple/clean/hash_shake256.c
new file mode 100644
index 00000000..4206e917
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/hash_shake256.c
@@ -0,0 +1,90 @@
+#include
+#include
+
+#include "address.h"
+#include "fips202.h"
+#include "hash.h"
+#include "params.h"
+#include "utils.h"
+
+/* For SHAKE256, there is no immediate reason to initialize at the start,
+ so this function is an empty operation. */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function(
+ const unsigned char *pub_seed, const unsigned char *sk_seed) {
+ (void)pub_seed; /* Suppress an 'unused parameter' warning. */
+ (void)sk_seed; /* Suppress an 'unused parameter' warning. */
+}
+
+/*
+ * Computes PRF(key, addr), given a secret key of SPX_N bytes and an address
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_prf_addr(
+ unsigned char *out, const unsigned char *key, const uint32_t addr[8]) {
+ unsigned char buf[SPX_N + SPX_ADDR_BYTES];
+
+ memcpy(buf, key, SPX_N);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_addr_to_bytes(buf + SPX_N, addr);
+
+ shake256(out, SPX_N, buf, SPX_N + SPX_ADDR_BYTES);
+}
+
+/**
+ * Computes the message-dependent randomness R, using a secret seed and an
+ * optional randomization value as well as the message.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_gen_message_random(
+ unsigned char *R,
+ const unsigned char *sk_prf, const unsigned char *optrand,
+ const unsigned char *m, unsigned long long mlen) {
+ uint64_t s_inc[26];
+
+ shake256_inc_init(s_inc);
+ shake256_inc_absorb(s_inc, sk_prf, SPX_N);
+ shake256_inc_absorb(s_inc, optrand, SPX_N);
+ shake256_inc_absorb(s_inc, m, mlen);
+ shake256_inc_finalize(s_inc);
+ shake256_inc_squeeze(R, SPX_N, s_inc);
+}
+
+/**
+ * Computes the message hash using R, the public key, and the message.
+ * Outputs the message digest and the index of the leaf. The index is split in
+ * the tree index and the leaf index, for convenient copying to an address.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_hash_message(
+ unsigned char *digest, uint64_t *tree, uint32_t *leaf_idx,
+ const unsigned char *R, const unsigned char *pk,
+ const unsigned char *m, unsigned long long mlen) {
+#define SPX_TREE_BITS (SPX_TREE_HEIGHT * (SPX_D - 1))
+#define SPX_TREE_BYTES ((SPX_TREE_BITS + 7) / 8)
+#define SPX_LEAF_BITS SPX_TREE_HEIGHT
+#define SPX_LEAF_BYTES ((SPX_LEAF_BITS + 7) / 8)
+#define SPX_DGST_BYTES (SPX_FORS_MSG_BYTES + SPX_TREE_BYTES + SPX_LEAF_BYTES)
+
+ unsigned char buf[SPX_DGST_BYTES];
+ unsigned char *bufp = buf;
+ uint64_t s_inc[26];
+
+ shake256_inc_init(s_inc);
+ shake256_inc_absorb(s_inc, R, SPX_N);
+ shake256_inc_absorb(s_inc, pk, SPX_PK_BYTES);
+ shake256_inc_absorb(s_inc, m, mlen);
+ shake256_inc_finalize(s_inc);
+ shake256_inc_squeeze(buf, SPX_DGST_BYTES, s_inc);
+
+ memcpy(digest, bufp, SPX_FORS_MSG_BYTES);
+ bufp += SPX_FORS_MSG_BYTES;
+
+ #if SPX_TREE_BITS > 64
+#error For given height and depth, 64 bits cannot represent all subtrees
+ #endif
+
+ *tree = PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull(
+ bufp, SPX_TREE_BYTES);
+ *tree &= (~(uint64_t)0) >> (64 - SPX_TREE_BITS);
+ bufp += SPX_TREE_BYTES;
+
+ *leaf_idx = PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull(
+ bufp, SPX_LEAF_BYTES);
+ *leaf_idx &= (~(uint32_t)0) >> (32 - SPX_LEAF_BITS);
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/params.h b/crypto_sign/sphincs-shake256-128f-simple/clean/params.h
new file mode 100644
index 00000000..1efe4dba
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/params.h
@@ -0,0 +1,81 @@
+#ifndef SPX_PARAMS_H
+#define SPX_PARAMS_H
+
+/* Hash output length in bytes. */
+#define SPX_N 16
+/* Height of the hypertree. */
+#define SPX_FULL_HEIGHT 60
+/* Number of subtree layer. */
+#define SPX_D 20
+/* FORS tree dimensions. */
+#define SPX_FORS_HEIGHT 9
+#define SPX_FORS_TREES 30
+/* Winternitz parameter, */
+#define SPX_WOTS_W 16
+
+/* The hash function is defined by linking a different hash.c file, as opposed
+ to setting a #define constant. */
+
+/* For clarity */
+#define SPX_ADDR_BYTES 32
+
+/* WOTS parameters. */
+#if SPX_WOTS_W == 256
+ #define SPX_WOTS_LOGW 8
+#elif SPX_WOTS_W == 16
+ #define SPX_WOTS_LOGW 4
+#else
+ #error SPX_WOTS_W assumed 16 or 256
+#endif
+
+#define SPX_WOTS_LEN1 (8 * SPX_N / SPX_WOTS_LOGW)
+
+/* SPX_WOTS_LEN2 is floor(log(len_1 * (w - 1)) / log(w)) + 1; we precompute */
+#if SPX_WOTS_W == 256
+ #if SPX_N <= 1
+ #define SPX_WOTS_LEN2 1
+ #elif SPX_N <= 256
+ #define SPX_WOTS_LEN2 2
+ #else
+ #error Did not precompute SPX_WOTS_LEN2 for n outside {2, .., 256}
+ #endif
+#elif SPX_WOTS_W == 16
+ #if SPX_N <= 8
+ #define SPX_WOTS_LEN2 2
+ #elif SPX_N <= 136
+ #define SPX_WOTS_LEN2 3
+ #elif SPX_N <= 256
+ #define SPX_WOTS_LEN2 4
+ #else
+ #error Did not precompute SPX_WOTS_LEN2 for n outside {2, .., 256}
+ #endif
+#endif
+
+#define SPX_WOTS_LEN (SPX_WOTS_LEN1 + SPX_WOTS_LEN2)
+#define SPX_WOTS_BYTES (SPX_WOTS_LEN * SPX_N)
+#define SPX_WOTS_PK_BYTES SPX_WOTS_BYTES
+
+/* Subtree size. */
+#define SPX_TREE_HEIGHT (SPX_FULL_HEIGHT / SPX_D)
+
+#if SPX_TREE_HEIGHT * SPX_D != SPX_FULL_HEIGHT
+ #error SPX_D should always divide SPX_FULL_HEIGHT
+#endif
+
+/* FORS parameters. */
+#define SPX_FORS_MSG_BYTES ((SPX_FORS_HEIGHT * SPX_FORS_TREES + 7) / 8)
+#define SPX_FORS_BYTES ((SPX_FORS_HEIGHT + 1) * SPX_FORS_TREES * SPX_N)
+#define SPX_FORS_PK_BYTES SPX_N
+
+/* Resulting SPX sizes. */
+#define SPX_BYTES (SPX_N + SPX_FORS_BYTES + SPX_D * SPX_WOTS_BYTES +\
+ SPX_FULL_HEIGHT * SPX_N)
+#define SPX_PK_BYTES (2 * SPX_N)
+#define SPX_SK_BYTES (2 * SPX_N + SPX_PK_BYTES)
+
+/* Optionally, signing can be made non-deterministic using optrand.
+ This can help counter side-channel attacks that would benefit from
+ getting a large number of traces when the signer uses the same nodes. */
+#define SPX_OPTRAND_BYTES 32
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/sign.c b/crypto_sign/sphincs-shake256-128f-simple/clean/sign.c
new file mode 100644
index 00000000..2ccc587f
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/sign.c
@@ -0,0 +1,344 @@
+#include
+#include
+#include
+
+#include "address.h"
+#include "api.h"
+#include "fors.h"
+#include "hash.h"
+#include "params.h"
+#include "randombytes.h"
+#include "thash.h"
+#include "utils.h"
+#include "wots.h"
+
+/**
+ * Computes the leaf at a given address. First generates the WOTS key pair,
+ * then computes leaf by hashing horizontally.
+ */
+static void wots_gen_leaf(unsigned char *leaf, const unsigned char *sk_seed,
+ const unsigned char *pub_seed,
+ uint32_t addr_idx, const uint32_t tree_addr[8]) {
+ unsigned char pk[SPX_WOTS_BYTES];
+ uint32_t wots_addr[8] = {0};
+ uint32_t wots_pk_addr[8] = {0};
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ wots_addr, SPX_ADDR_TYPE_WOTS);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ wots_pk_addr, SPX_ADDR_TYPE_WOTSPK);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_subtree_addr(
+ wots_addr, tree_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ wots_addr, addr_idx);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_gen_pk(
+ pk, sk_seed, pub_seed, wots_addr);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ wots_pk_addr, wots_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ leaf, pk, SPX_WOTS_LEN, pub_seed, wots_pk_addr);
+}
+
+/*
+ * Returns the length of a secret key, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_secretkeybytes(void) {
+ return PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SECRETKEYBYTES;
+}
+
+/*
+ * Returns the length of a public key, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_publickeybytes(void) {
+ return PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_PUBLICKEYBYTES;
+}
+
+/*
+ * Returns the length of a signature, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_bytes(void) {
+ return PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_BYTES;
+}
+
+/*
+ * Returns the length of the seed required to generate a key pair, in bytes
+ */
+size_t PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_seedbytes(void) {
+ return PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SEEDBYTES;
+}
+
+/*
+ * Generates an SPX key pair given a seed of length
+ * Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
+ * Format pk: [PUB_SEED || root]
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_seed_keypair(
+ uint8_t *pk, uint8_t *sk, const uint8_t *seed) {
+ /* We do not need the auth path in key generation, but it simplifies the
+ code to have just one treehash routine that computes both root and path
+ in one function. */
+ unsigned char auth_path[SPX_TREE_HEIGHT * SPX_N];
+ uint32_t top_tree_addr[8] = {0};
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_layer_addr(
+ top_tree_addr, SPX_D - 1);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ top_tree_addr, SPX_ADDR_TYPE_HASHTREE);
+
+ /* Initialize SK_SEED, SK_PRF and PUB_SEED from seed. */
+ memcpy(sk, seed, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SEEDBYTES);
+
+ memcpy(pk, sk + 2 * SPX_N, SPX_N);
+
+ /* This hook allows the hash function instantiation to do whatever
+ preparation or computation it needs, based on the public seed. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function(pk, sk);
+
+ /* Compute root node of the top-most subtree. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash(
+ sk + 3 * SPX_N, auth_path, sk, sk + 2 * SPX_N, 0, 0, SPX_TREE_HEIGHT,
+ wots_gen_leaf, top_tree_addr);
+
+ memcpy(pk + SPX_N, sk + 3 * SPX_N, SPX_N);
+
+ return 0;
+}
+
+/*
+ * Generates an SPX key pair.
+ * Format sk: [SK_SEED || SK_PRF || PUB_SEED || root]
+ * Format pk: [PUB_SEED || root]
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_keypair(
+ uint8_t *pk, uint8_t *sk) {
+ unsigned char seed[PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SEEDBYTES];
+ randombytes(seed, PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_CRYPTO_SEEDBYTES);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_seed_keypair(
+ pk, sk, seed);
+
+ return 0;
+}
+
+/**
+ * Returns an array containing a detached signature.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_signature(
+ uint8_t *sig, size_t *siglen,
+ const uint8_t *m, size_t mlen, const uint8_t *sk) {
+ const unsigned char *sk_seed = sk;
+ const unsigned char *sk_prf = sk + SPX_N;
+ const unsigned char *pk = sk + 2 * SPX_N;
+ const unsigned char *pub_seed = pk;
+
+ unsigned char optrand[SPX_N];
+ unsigned char mhash[SPX_FORS_MSG_BYTES];
+ unsigned char root[SPX_N];
+ unsigned long long i;
+ uint64_t tree;
+ uint32_t idx_leaf;
+ uint32_t wots_addr[8] = {0};
+ uint32_t tree_addr[8] = {0};
+
+ /* This hook allows the hash function instantiation to do whatever
+ preparation or computation it needs, based on the public seed. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function(
+ pub_seed, sk_seed);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ wots_addr, SPX_ADDR_TYPE_WOTS);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ tree_addr, SPX_ADDR_TYPE_HASHTREE);
+
+ /* Optionally, signing can be made non-deterministic using optrand.
+ This can help counter side-channel attacks that would benefit from
+ getting a large number of traces when the signer uses the same nodes. */
+ randombytes(optrand, SPX_N);
+ /* Compute the digest randomization value. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_gen_message_random(
+ sig, sk_prf, optrand, m, mlen);
+
+ /* Derive the message digest and leaf index from R, PK and M. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_hash_message(
+ mhash, &tree, &idx_leaf, sig, pk, m, mlen);
+ sig += SPX_N;
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(wots_addr, tree);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ wots_addr, idx_leaf);
+
+ /* Sign the message hash using FORS. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_sign(
+ sig, root, mhash, sk_seed, pub_seed, wots_addr);
+ sig += SPX_FORS_BYTES;
+
+ for (i = 0; i < SPX_D; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_layer_addr(tree_addr, i);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(tree_addr, tree);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_subtree_addr(
+ wots_addr, tree_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ wots_addr, idx_leaf);
+
+ /* Compute a WOTS signature. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_sign(
+ sig, root, sk_seed, pub_seed, wots_addr);
+ sig += SPX_WOTS_BYTES;
+
+ /* Compute the authentication path for the used WOTS leaf. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash(
+ root, sig, sk_seed, pub_seed, idx_leaf, 0,
+ SPX_TREE_HEIGHT, wots_gen_leaf, tree_addr);
+ sig += SPX_TREE_HEIGHT * SPX_N;
+
+ /* Update the indices for the next layer. */
+ idx_leaf = (tree & ((1 << SPX_TREE_HEIGHT) - 1));
+ tree = tree >> SPX_TREE_HEIGHT;
+ }
+
+ *siglen = SPX_BYTES;
+
+ return 0;
+}
+
+/**
+ * Verifies a detached signature and message under a given public key.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_verify(
+ const uint8_t *sig, size_t siglen,
+ const uint8_t *m, size_t mlen, const uint8_t *pk) {
+ const unsigned char *pub_seed = pk;
+ const unsigned char *pub_root = pk + SPX_N;
+ unsigned char mhash[SPX_FORS_MSG_BYTES];
+ unsigned char wots_pk[SPX_WOTS_BYTES];
+ unsigned char root[SPX_N];
+ unsigned char leaf[SPX_N];
+ unsigned int i;
+ uint64_t tree;
+ uint32_t idx_leaf;
+ uint32_t wots_addr[8] = {0};
+ uint32_t tree_addr[8] = {0};
+ uint32_t wots_pk_addr[8] = {0};
+
+ if (siglen != SPX_BYTES) {
+ return -1;
+ }
+
+ /* This hook allows the hash function instantiation to do whatever
+ preparation or computation it needs, based on the public seed. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_initialize_hash_function(
+ pub_seed, NULL);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ wots_addr, SPX_ADDR_TYPE_WOTS);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ tree_addr, SPX_ADDR_TYPE_HASHTREE);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_type(
+ wots_pk_addr, SPX_ADDR_TYPE_WOTSPK);
+
+ /* Derive the message digest and leaf index from R || PK || M. */
+ /* The additional SPX_N is a result of the hash domain separator. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_hash_message(
+ mhash, &tree, &idx_leaf, sig, pk, m, mlen);
+ sig += SPX_N;
+
+ /* Layer correctly defaults to 0, so no need to set_layer_addr */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(wots_addr, tree);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ wots_addr, idx_leaf);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_fors_pk_from_sig(
+ root, sig, mhash, pub_seed, wots_addr);
+ sig += SPX_FORS_BYTES;
+
+ /* For each subtree.. */
+ for (i = 0; i < SPX_D; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_layer_addr(tree_addr, i);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_addr(tree_addr, tree);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_subtree_addr(
+ wots_addr, tree_addr);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_keypair_addr(
+ wots_addr, idx_leaf);
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_copy_keypair_addr(
+ wots_pk_addr, wots_addr);
+
+ /* The WOTS public key is only correct if the signature was correct. */
+ /* Initially, root is the FORS pk, but on subsequent iterations it is
+ the root of the subtree below the currently processed subtree. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_pk_from_sig(
+ wots_pk, sig, root, pub_seed, wots_addr);
+ sig += SPX_WOTS_BYTES;
+
+ /* Compute the leaf node using the WOTS public key. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ leaf, wots_pk, SPX_WOTS_LEN, pub_seed, wots_pk_addr);
+
+ /* Compute the root node of this subtree. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_compute_root(
+ root, leaf, idx_leaf, 0, sig, SPX_TREE_HEIGHT,
+ pub_seed, tree_addr);
+ sig += SPX_TREE_HEIGHT * SPX_N;
+
+ /* Update the indices for the next layer. */
+ idx_leaf = (tree & ((1 << SPX_TREE_HEIGHT) - 1));
+ tree = tree >> SPX_TREE_HEIGHT;
+ }
+
+ /* Check if the root node equals the root node in the public key. */
+ if (memcmp(root, pub_root, SPX_N) != 0) {
+ return -1;
+ }
+
+ return 0;
+}
+
+
+/**
+ * Returns an array containing the signature followed by the message.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign(
+ uint8_t *sm, size_t *smlen,
+ const uint8_t *m, size_t mlen, const uint8_t *sk) {
+ size_t siglen;
+
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_signature(
+ sm, &siglen, m, mlen, sk);
+
+ memmove(sm + SPX_BYTES, m, mlen);
+ *smlen = siglen + mlen;
+
+ return 0;
+}
+
+/**
+ * Verifies a given signature-message pair under a given public key.
+ */
+int PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_open(
+ uint8_t *m, size_t *mlen,
+ const uint8_t *sm, size_t smlen, const uint8_t *pk) {
+ /* The API caller does not necessarily know what size a signature should be
+ but SPHINCS+ signatures are always exactly SPX_BYTES. */
+ if (smlen < SPX_BYTES) {
+ memset(m, 0, smlen);
+ *mlen = 0;
+ return -1;
+ }
+
+ *mlen = smlen - SPX_BYTES;
+
+ if (PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_crypto_sign_verify(
+ sm, SPX_BYTES, sm + SPX_BYTES, *mlen, pk)) {
+ memset(m, 0, smlen);
+ *mlen = 0;
+ return -1;
+ }
+
+ /* If verification was successful, move the message to the right place. */
+ memmove(m, sm + SPX_BYTES, *mlen);
+
+ return 0;
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/thash.h b/crypto_sign/sphincs-shake256-128f-simple/clean/thash.h
new file mode 100644
index 00000000..bad72599
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/thash.h
@@ -0,0 +1,10 @@
+#ifndef SPX_THASH_H
+#define SPX_THASH_H
+
+#include
+
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ unsigned char *out, const unsigned char *in, unsigned int inblocks,
+ const unsigned char *pub_seed, uint32_t addr[8]);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/thash_shake256_simple.c b/crypto_sign/sphincs-shake256-128f-simple/clean/thash_shake256_simple.c
new file mode 100644
index 00000000..71729727
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/thash_shake256_simple.c
@@ -0,0 +1,23 @@
+#include
+#include
+
+#include "thash.h"
+#include "address.h"
+#include "params.h"
+
+#include "fips202.h"
+
+/**
+ * Takes an array of inblocks concatenated arrays of SPX_N bytes.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ unsigned char *out, const unsigned char *in, unsigned int inblocks,
+ const unsigned char *pub_seed, uint32_t addr[8]) {
+ unsigned char buf[SPX_N + SPX_ADDR_BYTES + inblocks * SPX_N];
+
+ memcpy(buf, pub_seed, SPX_N);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_addr_to_bytes(buf + SPX_N, addr);
+ memcpy(buf + SPX_N + SPX_ADDR_BYTES, in, inblocks * SPX_N);
+
+ shake256(out, SPX_N, buf, SPX_N + SPX_ADDR_BYTES + inblocks * SPX_N);
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/utils.c b/crypto_sign/sphincs-shake256-128f-simple/clean/utils.c
new file mode 100644
index 00000000..ad1fd0f2
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/utils.c
@@ -0,0 +1,153 @@
+#include
+
+#include "utils.h"
+#include "address.h"
+#include "hash.h"
+#include "params.h"
+#include "thash.h"
+
+/**
+ * Converts the value of 'in' to 'outlen' bytes in big-endian byte order.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ull_to_bytes(
+ unsigned char *out, unsigned int outlen, unsigned long long in) {
+ int i;
+
+ /* Iterate over out in decreasing order, for big-endianness. */
+ for (i = outlen - 1; i >= 0; i--) {
+ out[i] = in & 0xff;
+ in = in >> 8;
+ }
+}
+
+/**
+ * Converts the inlen bytes in 'in' from big-endian byte order to an integer.
+ */
+unsigned long long PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull(
+ const unsigned char *in, unsigned int inlen) {
+ unsigned long long retval = 0;
+ unsigned int i;
+
+ for (i = 0; i < inlen; i++) {
+ retval |= ((unsigned long long)in[i]) << (8 * (inlen - 1 - i));
+ }
+ return retval;
+}
+
+/**
+ * Computes a root node given a leaf and an auth path.
+ * Expects address to be complete other than the tree_height and tree_index.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_compute_root(
+ unsigned char *root, const unsigned char *leaf,
+ uint32_t leaf_idx, uint32_t idx_offset,
+ const unsigned char *auth_path, uint32_t tree_height,
+ const unsigned char *pub_seed, uint32_t addr[8]) {
+ uint32_t i;
+ unsigned char buffer[2 * SPX_N];
+
+ /* If leaf_idx is odd (last bit = 1), current path element is a right child
+ and auth_path has to go left. Otherwise it is the other way around. */
+ if (leaf_idx & 1) {
+ memcpy(buffer + SPX_N, leaf, SPX_N);
+ memcpy(buffer, auth_path, SPX_N);
+ } else {
+ memcpy(buffer, leaf, SPX_N);
+ memcpy(buffer + SPX_N, auth_path, SPX_N);
+ }
+ auth_path += SPX_N;
+
+ for (i = 0; i < tree_height - 1; i++) {
+ leaf_idx >>= 1;
+ idx_offset >>= 1;
+ /* Set the address of the node we're creating. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(addr, i + 1);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ addr, leaf_idx + idx_offset);
+
+ /* Pick the right or left neighbor, depending on parity of the node. */
+ if (leaf_idx & 1) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ buffer + SPX_N, buffer, 2, pub_seed, addr);
+ memcpy(buffer, auth_path, SPX_N);
+ } else {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ buffer, buffer, 2, pub_seed, addr);
+ memcpy(buffer + SPX_N, auth_path, SPX_N);
+ }
+ auth_path += SPX_N;
+ }
+
+ /* The last iteration is exceptional; we do not copy an auth_path node. */
+ leaf_idx >>= 1;
+ idx_offset >>= 1;
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(addr, tree_height);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ addr, leaf_idx + idx_offset);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ root, buffer, 2, pub_seed, addr);
+}
+
+/**
+ * For a given leaf index, computes the authentication path and the resulting
+ * root node using Merkle's TreeHash algorithm.
+ * Expects the layer and tree parts of the tree_addr to be set, as well as the
+ * tree type (i.e. SPX_ADDR_TYPE_HASHTREE or SPX_ADDR_TYPE_FORSTREE).
+ * Applies the offset idx_offset to indices before building addresses, so that
+ * it is possible to continue counting indices across trees.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash(
+ unsigned char *root, unsigned char *auth_path,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ uint32_t leaf_idx, uint32_t idx_offset, uint32_t tree_height,
+ void (*gen_leaf)(
+ unsigned char * /* leaf */,
+ const unsigned char * /* sk_seed */,
+ const unsigned char * /* pub_seed */,
+ uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */),
+ uint32_t tree_addr[8]) {
+ unsigned char stack[(tree_height + 1)*SPX_N];
+ unsigned int heights[tree_height + 1];
+ unsigned int offset = 0;
+ uint32_t idx;
+ uint32_t tree_idx;
+
+ for (idx = 0; idx < (uint32_t)(1 << tree_height); idx++) {
+ /* Add the next leaf node to the stack. */
+ gen_leaf(stack + offset * SPX_N,
+ sk_seed, pub_seed, idx + idx_offset, tree_addr);
+ offset++;
+ heights[offset - 1] = 0;
+
+ /* If this is a node we need for the auth path.. */
+ if ((leaf_idx ^ 0x1) == idx) {
+ memcpy(auth_path, stack + (offset - 1)*SPX_N, SPX_N);
+ }
+
+ /* While the top-most nodes are of equal height.. */
+ while (offset >= 2 && heights[offset - 1] == heights[offset - 2]) {
+ /* Compute index of the new node, in the next layer. */
+ tree_idx = (idx >> (heights[offset - 1] + 1));
+
+ /* Set the address of the node we're creating. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_height(
+ tree_addr, heights[offset - 1] + 1);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_tree_index(
+ tree_addr, tree_idx + (idx_offset >> (heights[offset - 1] + 1)));
+ /* Hash the top-most nodes from the stack together. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ stack + (offset - 2)*SPX_N, stack + (offset - 2)*SPX_N, 2,
+ pub_seed, tree_addr);
+ offset--;
+ /* Note that the top-most node is now one layer higher. */
+ heights[offset - 1]++;
+
+ /* If this is a node we need for the auth path.. */
+ if (((leaf_idx >> heights[offset - 1]) ^ 0x1) == tree_idx) {
+ memcpy(auth_path + heights[offset - 1]*SPX_N,
+ stack + (offset - 1)*SPX_N, SPX_N);
+ }
+ }
+ }
+ memcpy(root, stack, SPX_N);
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/utils.h b/crypto_sign/sphincs-shake256-128f-simple/clean/utils.h
new file mode 100644
index 00000000..6df8d916
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/utils.h
@@ -0,0 +1,48 @@
+#ifndef SPX_UTILS_H
+#define SPX_UTILS_H
+
+#include "params.h"
+#include
+
+/**
+ * Converts the value of 'in' to 'outlen' bytes in big-endian byte order.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ull_to_bytes(
+ unsigned char *out, unsigned int outlen, unsigned long long in);
+
+/**
+ * Converts the inlen bytes in 'in' from big-endian byte order to an integer.
+ */
+unsigned long long PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_bytes_to_ull(
+ const unsigned char *in, unsigned int inlen);
+
+/**
+ * Computes a root node given a leaf and an auth path.
+ * Expects address to be complete other than the tree_height and tree_index.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_compute_root(
+ unsigned char *root, const unsigned char *leaf,
+ uint32_t leaf_idx, uint32_t idx_offset,
+ const unsigned char *auth_path, uint32_t tree_height,
+ const unsigned char *pub_seed, uint32_t addr[8]);
+
+/**
+ * For a given leaf index, computes the authentication path and the resulting
+ * root node using Merkle's TreeHash algorithm.
+ * Expects the layer and tree parts of the tree_addr to be set, as well as the
+ * tree type (i.e. SPX_ADDR_TYPE_HASHTREE or SPX_ADDR_TYPE_FORSTREE).
+ * Applies the offset idx_offset to indices before building addresses, so that
+ * it is possible to continue counting indices across trees.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_treehash(
+ unsigned char *root, unsigned char *auth_path,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ uint32_t leaf_idx, uint32_t idx_offset, uint32_t tree_height,
+ void (*gen_leaf)(
+ unsigned char * /* leaf */,
+ const unsigned char * /* sk_seed */,
+ const unsigned char * /* pub_seed */,
+ uint32_t /* addr_idx */, const uint32_t[8] /* tree_addr */),
+ uint32_t tree_addr[8]);
+
+#endif
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/wots.c b/crypto_sign/sphincs-shake256-128f-simple/clean/wots.c
new file mode 100644
index 00000000..9bdeebab
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/wots.c
@@ -0,0 +1,159 @@
+#include
+#include
+
+#include "utils.h"
+#include "address.h"
+#include "hash.h"
+#include "params.h"
+#include "thash.h"
+#include "wots.h"
+
+// TODO clarify address expectations, and make them more uniform.
+// TODO i.e. do we expect types to be set already?
+// TODO and do we expect modifications or copies?
+
+/**
+ * Computes the starting value for a chain, i.e. the secret key.
+ * Expects the address to be complete up to the chain address.
+ */
+static void wots_gen_sk(unsigned char *sk, const unsigned char *sk_seed,
+ uint32_t wots_addr[8]) {
+ /* Make sure that the hash address is actually zeroed. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_hash_addr(wots_addr, 0);
+
+ /* Generate sk element. */
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_prf_addr(sk, sk_seed, wots_addr);
+}
+
+/**
+ * Computes the chaining function.
+ * out and in have to be n-byte arrays.
+ *
+ * Interprets in as start-th value of the chain.
+ * addr has to contain the address of the chain.
+ */
+static void gen_chain(unsigned char *out, const unsigned char *in,
+ unsigned int start, unsigned int steps,
+ const unsigned char *pub_seed, uint32_t addr[8]) {
+ uint32_t i;
+
+ /* Initialize out with the value at position 'start'. */
+ memcpy(out, in, SPX_N);
+
+ /* Iterate 'steps' calls to the hash function. */
+ for (i = start; i < (start + steps) && i < SPX_WOTS_W; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_hash_addr(addr, i);
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_thash(
+ out, out, 1, pub_seed, addr);
+ }
+}
+
+/**
+ * base_w algorithm as described in draft.
+ * Interprets an array of bytes as integers in base w.
+ * This only works when log_w is a divisor of 8.
+ */
+static void base_w(int *output, const int out_len, const unsigned char *input) {
+ int in = 0;
+ int out = 0;
+ unsigned char total;
+ int bits = 0;
+ int consumed;
+
+ for (consumed = 0; consumed < out_len; consumed++) {
+ if (bits == 0) {
+ total = input[in];
+ in++;
+ bits += 8;
+ }
+ bits -= SPX_WOTS_LOGW;
+ output[out] = (total >> bits) & (SPX_WOTS_W - 1);
+ out++;
+ }
+}
+
+/* Computes the WOTS+ checksum over a message (in base_w). */
+static void wots_checksum(int *csum_base_w, const int *msg_base_w) {
+ int csum = 0;
+ unsigned char csum_bytes[(SPX_WOTS_LEN2 * SPX_WOTS_LOGW + 7) / 8];
+ unsigned int i;
+
+ /* Compute checksum. */
+ for (i = 0; i < SPX_WOTS_LEN1; i++) {
+ csum += SPX_WOTS_W - 1 - msg_base_w[i];
+ }
+
+ /* Convert checksum to base_w. */
+ /* Make sure expected empty zero bits are the least significant bits. */
+ csum = csum << (8 - ((SPX_WOTS_LEN2 * SPX_WOTS_LOGW) % 8));
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_ull_to_bytes(
+ csum_bytes, sizeof(csum_bytes), csum);
+ base_w(csum_base_w, SPX_WOTS_LEN2, csum_bytes);
+}
+
+/* Takes a message and derives the matching chain lengths. */
+static void chain_lengths(int *lengths, const unsigned char *msg) {
+ base_w(lengths, SPX_WOTS_LEN1, msg);
+ wots_checksum(lengths + SPX_WOTS_LEN1, lengths);
+}
+
+/**
+ * WOTS key generation. Takes a 32 byte sk_seed, expands it to WOTS private key
+ * elements and computes the corresponding public key.
+ * It requires the seed pub_seed (used to generate bitmasks and hash keys)
+ * and the address of this WOTS key pair.
+ *
+ * Writes the computed public key to 'pk'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_gen_pk(
+ unsigned char *pk, const unsigned char *sk_seed,
+ const unsigned char *pub_seed, uint32_t addr[8]) {
+ uint32_t i;
+
+ for (i = 0; i < SPX_WOTS_LEN; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_chain_addr(addr, i);
+ wots_gen_sk(pk + i * SPX_N, sk_seed, addr);
+ gen_chain(pk + i * SPX_N, pk + i * SPX_N,
+ 0, SPX_WOTS_W - 1, pub_seed, addr);
+ }
+}
+
+/**
+ * Takes a n-byte message and the 32-byte sk_see to compute a signature 'sig'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_sign(
+ unsigned char *sig, const unsigned char *msg,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ uint32_t addr[8]) {
+ int lengths[SPX_WOTS_LEN];
+ uint32_t i;
+
+ chain_lengths(lengths, msg);
+
+ for (i = 0; i < SPX_WOTS_LEN; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_chain_addr(addr, i);
+ wots_gen_sk(sig + i * SPX_N, sk_seed, addr);
+ gen_chain(sig + i * SPX_N, sig + i * SPX_N, 0, lengths[i], pub_seed, addr);
+ }
+}
+
+/**
+ * Takes a WOTS signature and an n-byte message, computes a WOTS public key.
+ *
+ * Writes the computed public key to 'pk'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_pk_from_sig(
+ unsigned char *pk,
+ const unsigned char *sig, const unsigned char *msg,
+ const unsigned char *pub_seed, uint32_t addr[8]) {
+ int lengths[SPX_WOTS_LEN];
+ uint32_t i;
+
+ chain_lengths(lengths, msg);
+
+ for (i = 0; i < SPX_WOTS_LEN; i++) {
+ PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_set_chain_addr(addr, i);
+ gen_chain(pk + i * SPX_N, sig + i * SPX_N,
+ lengths[i], SPX_WOTS_W - 1 - lengths[i], pub_seed, addr);
+ }
+}
diff --git a/crypto_sign/sphincs-shake256-128f-simple/clean/wots.h b/crypto_sign/sphincs-shake256-128f-simple/clean/wots.h
new file mode 100644
index 00000000..54b6781a
--- /dev/null
+++ b/crypto_sign/sphincs-shake256-128f-simple/clean/wots.h
@@ -0,0 +1,38 @@
+#ifndef SPX_WOTS_H
+#define SPX_WOTS_H
+
+#include "params.h"
+#include
+
+/**
+ * WOTS key generation. Takes a 32 byte seed for the private key, expands it to
+ * a full WOTS private key and computes the corresponding public key.
+ * It requires the seed pub_seed (used to generate bitmasks and hash keys)
+ * and the address of this WOTS key pair.
+ *
+ * Writes the computed public key to 'pk'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_gen_pk(
+ unsigned char *pk, const unsigned char *sk_seed,
+ const unsigned char *pub_seed, uint32_t addr[8]);
+
+/**
+ * Takes a n-byte message and the 32-byte seed for the private key to compute a
+ * signature that is placed at 'sig'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_sign(
+ unsigned char *sig, const unsigned char *msg,
+ const unsigned char *sk_seed, const unsigned char *pub_seed,
+ uint32_t addr[8]);
+
+/**
+ * Takes a WOTS signature and an n-byte message, computes a WOTS public key.
+ *
+ * Writes the computed public key to 'pk'.
+ */
+void PQCLEAN_SPHINCSSHAKE256128FSIMPLE_CLEAN_wots_pk_from_sig(
+ unsigned char *pk,
+ const unsigned char *sig, const unsigned char *msg,
+ const unsigned char *pub_seed, uint32_t addr[8]);
+
+#endif