From 32b3a978091f2c6b318d7cebaa192b08321ead7f Mon Sep 17 00:00:00 2001
From: Leon <leon.botros@gmail.com>
Date: Mon, 10 Jun 2019 20:40:49 +0200
Subject: [PATCH] add sha3_384

---
 common/fips202.c | 43 +++++++++++++++++++++++++++++++++++++++++++
 common/fips202.h | 12 ++++++++++++
 2 files changed, 55 insertions(+)

diff --git a/common/fips202.c b/common/fips202.c
index 0fb29fab..794e25a0 100644
--- a/common/fips202.c
+++ b/common/fips202.c
@@ -718,6 +718,49 @@ void sha3_256(uint8_t *output, const uint8_t *input, size_t inlen) {
     }
 }
 
+void sha3_384_inc_init(sha3_384incctx *state) {
+    keccak_inc_init(state->ctx);
+}
+
+void sha3_384_inc_absorb(sha3_384incctx *state, const uint8_t *input, size_t inlen) {
+    keccak_inc_absorb(state->ctx, SHA3_384_RATE, input, inlen);
+}
+
+void sha3_384_inc_finalize(uint8_t *output, sha3_384incctx *state) {
+    uint8_t t[SHA3_384_RATE];
+    keccak_inc_finalize(state->ctx, SHA3_384_RATE, 0x06);
+
+    keccak_squeezeblocks(t, 1, state->ctx, SHA3_384_RATE);
+
+    for (size_t i = 0; i < 48; i++) {
+        output[i] = t[i];
+    }
+}
+
+/*************************************************
+ * Name:        sha3_384
+ *
+ * Description: SHA3-256 with non-incremental API
+ *
+ * Arguments:   - uint8_t *output:      pointer to output
+ *              - const uint8_t *input: pointer to input
+ *              - size_t inlen:   length of input in bytes
+ **************************************************/
+void sha3_384(uint8_t *output, const uint8_t *input, size_t inlen) {
+    uint64_t s[25];
+    uint8_t t[SHA3_384_RATE];
+
+    /* Absorb input */
+    keccak_absorb(s, SHA3_384_RATE, input, inlen, 0x06);
+
+    /* Squeeze output */
+    keccak_squeezeblocks(t, 1, s, SHA3_384_RATE);
+
+    for (size_t i = 0; i < 48; i++) {
+        output[i] = t[i];
+    }
+}
+
 void sha3_512_inc_init(sha3_512incctx *state) {
     keccak_inc_init(state->ctx);
 }
diff --git a/common/fips202.h b/common/fips202.h
index 622d736a..5d62b284 100644
--- a/common/fips202.h
+++ b/common/fips202.h
@@ -7,6 +7,7 @@
 #define SHAKE128_RATE 168
 #define SHAKE256_RATE 136
 #define SHA3_256_RATE 136
+#define SHA3_384_RATE 104
 #define SHA3_512_RATE 72
 
 
@@ -35,6 +36,11 @@ typedef struct {
     uint64_t ctx[26];
 } sha3_256incctx;
 
+// Context for incremental API
+typedef struct {
+    uint64_t ctx[26];
+} sha3_384incctx;
+
 // Context for incremental API
 typedef struct {
     uint64_t ctx[26];
@@ -69,6 +75,12 @@ void sha3_256_inc_finalize(uint8_t *output, sha3_256incctx *state);
 
 void sha3_256(uint8_t *output, const uint8_t *input, size_t inlen);
 
+void sha3_384_inc_init(sha3_384incctx *state);
+void sha3_384_inc_absorb(sha3_384incctx *state, const uint8_t *input, size_t inlen);
+void sha3_384_inc_finalize(uint8_t *output, sha3_384incctx *state);
+
+void sha3_384(uint8_t *output, const uint8_t *input, size_t inlen);
+
 void sha3_512_inc_init(sha3_512incctx *state);
 void sha3_512_inc_absorb(sha3_512incctx *state, const uint8_t *input, size_t inlen);
 void sha3_512_inc_finalize(uint8_t *output, sha3_512incctx *state);