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/*
* Copyright (c) 2021, [Ribose Inc](https://www.ribose.com).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "ecdsa.h"
#include "utils.h"
#include <string.h>
#include "bn.h"
#include "ec_ossl.h"
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/ec.h>
static bool
ecdsa_decode_sig(const uint8_t *data, size_t len, pgp_ec_signature_t &sig)
{
ECDSA_SIG *esig = d2i_ECDSA_SIG(NULL, &data, len);
if (!esig) {
RNP_LOG("Failed to parse ECDSA sig: %lu", ERR_peek_last_error());
return false;
}
const BIGNUM *r, *s;
ECDSA_SIG_get0(esig, &r, &s);
bn2mpi(r, &sig.r);
bn2mpi(s, &sig.s);
ECDSA_SIG_free(esig);
return true;
}
static bool
ecdsa_encode_sig(uint8_t *data, size_t *len, const pgp_ec_signature_t &sig)
{
bool res = false;
ECDSA_SIG *dsig = ECDSA_SIG_new();
BIGNUM * r = mpi2bn(&sig.r);
BIGNUM * s = mpi2bn(&sig.s);
if (!dsig || !r || !s) {
RNP_LOG("Allocation failed.");
goto done;
}
ECDSA_SIG_set0(dsig, r, s);
r = NULL;
s = NULL;
int outlen;
outlen = i2d_ECDSA_SIG(dsig, &data);
if (outlen < 0) {
RNP_LOG("Failed to encode signature.");
goto done;
}
*len = outlen;
res = true;
done:
ECDSA_SIG_free(dsig);
BN_free(r);
BN_free(s);
return res;
}
rnp_result_t
ecdsa_validate_key(rnp::RNG *rng, const pgp_ec_key_t *key, bool secret)
{
return ec_validate_key(*key, secret);
}
rnp_result_t
ecdsa_sign(rnp::RNG * rng,
pgp_ec_signature_t *sig,
pgp_hash_alg_t hash_alg,
const uint8_t * hash,
size_t hash_len,
const pgp_ec_key_t *key)
{
if (mpi_bytes(&key->x) == 0) {
RNP_LOG("private key not set");
return RNP_ERROR_BAD_PARAMETERS;
}
/* Load secret key to DSA structure*/
EVP_PKEY *evpkey = ec_load_key(key->p, &key->x, key->curve);
if (!evpkey) {
RNP_LOG("Failed to load key");
return RNP_ERROR_BAD_PARAMETERS;
}
rnp_result_t ret = RNP_ERROR_GENERIC;
/* init context and sign */
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(evpkey, NULL);
if (!ctx) {
RNP_LOG("Context allocation failed: %lu", ERR_peek_last_error());
goto done;
}
if (EVP_PKEY_sign_init(ctx) <= 0) {
RNP_LOG("Failed to initialize signing: %lu", ERR_peek_last_error());
goto done;
}
sig->s.len = PGP_MPINT_SIZE;
if (EVP_PKEY_sign(ctx, sig->s.mpi, &sig->s.len, hash, hash_len) <= 0) {
RNP_LOG("Signing failed: %lu", ERR_peek_last_error());
sig->s.len = 0;
goto done;
}
if (!ecdsa_decode_sig(&sig->s.mpi[0], sig->s.len, *sig)) {
RNP_LOG("Failed to parse ECDSA sig: %lu", ERR_peek_last_error());
goto done;
}
ret = RNP_SUCCESS;
done:
EVP_PKEY_CTX_free(ctx);
EVP_PKEY_free(evpkey);
return ret;
}
rnp_result_t
ecdsa_verify(const pgp_ec_signature_t *sig,
pgp_hash_alg_t hash_alg,
const uint8_t * hash,
size_t hash_len,
const pgp_ec_key_t * key)
{
/* Load secret key to DSA structure*/
EVP_PKEY *evpkey = ec_load_key(key->p, NULL, key->curve);
if (!evpkey) {
RNP_LOG("Failed to load key");
return RNP_ERROR_BAD_PARAMETERS;
}
rnp_result_t ret = RNP_ERROR_SIGNATURE_INVALID;
/* init context and sign */
EVP_PKEY_CTX *ctx = EVP_PKEY_CTX_new(evpkey, NULL);
if (!ctx) {
RNP_LOG("Context allocation failed: %lu", ERR_peek_last_error());
goto done;
}
if (EVP_PKEY_verify_init(ctx) <= 0) {
RNP_LOG("Failed to initialize verify: %lu", ERR_peek_last_error());
goto done;
}
pgp_mpi_t sigbuf;
if (!ecdsa_encode_sig(sigbuf.mpi, &sigbuf.len, *sig)) {
goto done;
}
if (EVP_PKEY_verify(ctx, sigbuf.mpi, sigbuf.len, hash, hash_len) > 0) {
ret = RNP_SUCCESS;
}
done:
EVP_PKEY_CTX_free(ctx);
EVP_PKEY_free(evpkey);
return ret;
}
pgp_hash_alg_t
ecdsa_get_min_hash(pgp_curve_t curve)
{
switch (curve) {
case PGP_CURVE_NIST_P_256:
case PGP_CURVE_BP256:
case PGP_CURVE_P256K1:
return PGP_HASH_SHA256;
case PGP_CURVE_NIST_P_384:
case PGP_CURVE_BP384:
return PGP_HASH_SHA384;
case PGP_CURVE_NIST_P_521:
case PGP_CURVE_BP512:
return PGP_HASH_SHA512;
default:
return PGP_HASH_UNKNOWN;
}
}
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