75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
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/// @file sign.c
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/// @brief the implementations for functions in api.h
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///
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///
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#include "api.h"
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#include "rainbow.h"
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#include "rainbow_config.h"
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#include "rainbow_keypair.h"
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#include "randombytes.h"
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#include "utils_hash.h"
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#include <stdlib.h>
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#include <string.h>
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int PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
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unsigned char sk_seed[LEN_SKSEED] = {0};
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randombytes(sk_seed, LEN_SKSEED);
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PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_generate_keypair((pk_t *)pk, (sk_t *)sk, sk_seed);
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return 0;
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}
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int PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_crypto_sign(unsigned char *sm, size_t *smlen, const unsigned char *m, size_t mlen, const unsigned char *sk) {
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unsigned char digest[_HASH_LEN];
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PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
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memcpy(sm, m, mlen);
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smlen[0] = mlen + _SIGNATURE_BYTE;
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return PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_rainbow_sign(sm + mlen, (const sk_t *)sk, digest);
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}
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int PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_crypto_sign_open(unsigned char *m, size_t *mlen, const unsigned char *sm, size_t smlen, const unsigned char *pk) {
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int rc;
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if (_SIGNATURE_BYTE > smlen) {
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rc = -1;
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} else {
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*mlen = smlen - _SIGNATURE_BYTE;
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unsigned char digest[_HASH_LEN];
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PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, sm, *mlen);
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rc = PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_rainbow_verify(digest, sm + mlen[0], (const pk_t *)pk);
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}
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if (!rc) {
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memcpy(m, sm, smlen - _SIGNATURE_BYTE);
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} else { // bad signature
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*mlen = (size_t) -1;
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memset(m, 0, smlen);
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}
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return rc;
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}
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int PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_crypto_sign_signature(
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uint8_t *sig, size_t *siglen,
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const uint8_t *m, size_t mlen, const uint8_t *sk) {
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unsigned char digest[_HASH_LEN];
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PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
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*siglen = _SIGNATURE_BYTE;
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return PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_rainbow_sign(sig, (const sk_t *)sk, digest);
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}
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int PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_crypto_sign_verify(
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const uint8_t *sig, size_t siglen,
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const uint8_t *m, size_t mlen, const uint8_t *pk) {
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if (siglen != _SIGNATURE_BYTE) {
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return -1;
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}
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unsigned char digest[_HASH_LEN];
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PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
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return PQCLEAN_RAINBOWIIICCLASSIC_CLEAN_rainbow_verify(digest, sig, (const pk_t *)pk);
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}
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