75 lines
2.4 KiB
C
75 lines
2.4 KiB
C
/// @file sign.c
|
|
/// @brief the implementations for functions in api.h
|
|
///
|
|
///
|
|
|
|
#include "api.h"
|
|
#include "rainbow.h"
|
|
#include "rainbow_config.h"
|
|
#include "rainbow_keypair.h"
|
|
#include "randombytes.h"
|
|
#include "utils_hash.h"
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
int PQCLEAN_RAINBOWIACLASSIC_CLEAN_crypto_sign_keypair(unsigned char *pk, unsigned char *sk) {
|
|
unsigned char sk_seed[LEN_SKSEED] = {0};
|
|
randombytes(sk_seed, LEN_SKSEED);
|
|
|
|
PQCLEAN_RAINBOWIACLASSIC_CLEAN_generate_keypair((pk_t *)pk, (sk_t *)sk, sk_seed);
|
|
return 0;
|
|
}
|
|
|
|
int PQCLEAN_RAINBOWIACLASSIC_CLEAN_crypto_sign(unsigned char *sm, size_t *smlen, const unsigned char *m, size_t mlen, const unsigned char *sk) {
|
|
unsigned char digest[_HASH_LEN];
|
|
|
|
PQCLEAN_RAINBOWIACLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
|
|
|
|
memcpy(sm, m, mlen);
|
|
smlen[0] = mlen + _SIGNATURE_BYTE;
|
|
|
|
return PQCLEAN_RAINBOWIACLASSIC_CLEAN_rainbow_sign(sm + mlen, (const sk_t *)sk, digest);
|
|
}
|
|
|
|
int PQCLEAN_RAINBOWIACLASSIC_CLEAN_crypto_sign_open(unsigned char *m, size_t *mlen, const unsigned char *sm, size_t smlen, const unsigned char *pk) {
|
|
int rc;
|
|
if (_SIGNATURE_BYTE > smlen) {
|
|
rc = -1;
|
|
} else {
|
|
*mlen = smlen - _SIGNATURE_BYTE;
|
|
|
|
unsigned char digest[_HASH_LEN];
|
|
PQCLEAN_RAINBOWIACLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, sm, *mlen);
|
|
|
|
rc = PQCLEAN_RAINBOWIACLASSIC_CLEAN_rainbow_verify(digest, sm + mlen[0], (const pk_t *)pk);
|
|
}
|
|
if (!rc) {
|
|
memmove(m, sm, smlen - _SIGNATURE_BYTE);
|
|
} else { // bad signature
|
|
*mlen = (size_t) -1;
|
|
memset(m, 0, smlen);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int PQCLEAN_RAINBOWIACLASSIC_CLEAN_crypto_sign_signature(
|
|
uint8_t *sig, size_t *siglen,
|
|
const uint8_t *m, size_t mlen, const uint8_t *sk) {
|
|
unsigned char digest[_HASH_LEN];
|
|
|
|
PQCLEAN_RAINBOWIACLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
|
|
*siglen = _SIGNATURE_BYTE;
|
|
return PQCLEAN_RAINBOWIACLASSIC_CLEAN_rainbow_sign(sig, (const sk_t *)sk, digest);
|
|
}
|
|
|
|
int PQCLEAN_RAINBOWIACLASSIC_CLEAN_crypto_sign_verify(
|
|
const uint8_t *sig, size_t siglen,
|
|
const uint8_t *m, size_t mlen, const uint8_t *pk) {
|
|
if (siglen != _SIGNATURE_BYTE) {
|
|
return -1;
|
|
}
|
|
unsigned char digest[_HASH_LEN];
|
|
PQCLEAN_RAINBOWIACLASSIC_CLEAN_hash_msg(digest, _HASH_LEN, m, mlen);
|
|
return PQCLEAN_RAINBOWIACLASSIC_CLEAN_rainbow_verify(digest, sig, (const pk_t *)pk);
|
|
}
|