95 lines
2.4 KiB
C
95 lines
2.4 KiB
C
/// @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
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PQCLEAN_RAINBOWVCCYCLIC_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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unsigned char pk_seed[LEN_PKSEED] = {0};
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randombytes( pk_seed, LEN_PKSEED );
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_generate_keypair_cyclic( (cpk_t *) pk, (sk_t *) sk, pk_seed, sk_seed );
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return 0;
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}
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int
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PQCLEAN_RAINBOWVCCYCLIC_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_RAINBOWVCCYCLIC_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_RAINBOWVCCYCLIC_CLEAN_rainbow_sign( sm + mlen, (const sk_t *)sk, digest );
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}
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int
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PQCLEAN_RAINBOWVCCYCLIC_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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//TODO: this should not copy out the message if verification fails
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if ( _SIGNATURE_BYTE > smlen ) {
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return -1;
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}
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memcpy( m, sm, smlen - _SIGNATURE_BYTE );
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mlen[0] = smlen - _SIGNATURE_BYTE;
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unsigned char digest[_HASH_LEN];
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PQCLEAN_RAINBOWVCCYCLIC_CLEAN_hash_msg( digest, _HASH_LEN, m, *mlen );
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return PQCLEAN_RAINBOWVCCYCLIC_CLEAN_rainbow_verify_cyclic( digest, sm + mlen[0], (const cpk_t *)pk );
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}
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int PQCLEAN_RAINBOWVCCYCLIC_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_RAINBOWVCCYCLIC_CLEAN_hash_msg( digest, _HASH_LEN, m, mlen );
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*siglen = _SIGNATURE_BYTE;
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return PQCLEAN_RAINBOWVCCYCLIC_CLEAN_rainbow_sign( sig, (const sk_t *)sk, digest );
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}
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int PQCLEAN_RAINBOWVCCYCLIC_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_RAINBOWVCCYCLIC_CLEAN_hash_msg( digest, _HASH_LEN, m, mlen );
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return PQCLEAN_RAINBOWVCCYCLIC_CLEAN_rainbow_verify_cyclic( digest, sig, (const cpk_t *)pk );
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}
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