/*
- * Copyright 2017 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved.
* Copyright 2017 Ribose Inc. All Rights Reserved.
* Ported from Ribose contributions from Botan.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
-#include <openssl/sm2.h>
+#include "internal/sm2.h"
+#include "internal/sm2err.h"
+#include "internal/ec_int.h" /* ec_group_do_inverse_ord() */
+#include "internal/numbers.h"
+#include <openssl/err.h>
#include <openssl/evp.h>
+#include <openssl/err.h>
#include <openssl/bn.h>
#include <string.h>
-static BIGNUM *compute_msg_hash(const EVP_MD *digest,
- const EC_KEY *key,
- const char *user_id,
- const uint8_t *msg, size_t msg_len)
+int sm2_compute_z_digest(uint8_t *out,
+ const EVP_MD *digest,
+ const uint8_t *id,
+ const size_t id_len,
+ const EC_KEY *key)
{
- EVP_MD_CTX *hash = EVP_MD_CTX_new();
- const int md_size = EVP_MD_size(digest);
- uint8_t *za = OPENSSL_zalloc(md_size);
- BIGNUM *e = NULL;
+ int rc = 0;
+ const EC_GROUP *group = EC_KEY_get0_group(key);
+ BN_CTX *ctx = NULL;
+ EVP_MD_CTX *hash = NULL;
+ BIGNUM *p = NULL;
+ BIGNUM *a = NULL;
+ BIGNUM *b = NULL;
+ BIGNUM *xG = NULL;
+ BIGNUM *yG = NULL;
+ BIGNUM *xA = NULL;
+ BIGNUM *yA = NULL;
+ int p_bytes = 0;
+ uint8_t *buf = NULL;
+ uint16_t entl = 0;
+ uint8_t e_byte = 0;
+
+ hash = EVP_MD_CTX_new();
+ ctx = BN_CTX_new();
+ if (hash == NULL || ctx == NULL) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ p = BN_CTX_get(ctx);
+ a = BN_CTX_get(ctx);
+ b = BN_CTX_get(ctx);
+ xG = BN_CTX_get(ctx);
+ yG = BN_CTX_get(ctx);
+ xA = BN_CTX_get(ctx);
+ yA = BN_CTX_get(ctx);
- if (za == NULL)
+ if (yA == NULL) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
goto done;
+ }
- if (hash == NULL)
+ if (!EVP_DigestInit(hash, digest)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
goto done;
+ }
- if (SM2_compute_userid_digest(za, digest, user_id, key) == 0)
+ /* Z = h(ENTL || ID || a || b || xG || yG || xA || yA) */
+
+ if (id_len >= (UINT16_MAX / 8)) {
+ /* too large */
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, SM2_R_ID_TOO_LARGE);
goto done;
+ }
+
+ entl = (uint16_t)(8 * id_len);
- if (EVP_DigestInit(hash, digest) == 0)
+ e_byte = entl >> 8;
+ if (!EVP_DigestUpdate(hash, &e_byte, 1)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
goto done;
+ }
+ e_byte = entl & 0xFF;
+ if (!EVP_DigestUpdate(hash, &e_byte, 1)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
+ goto done;
+ }
- if (EVP_DigestUpdate(hash, za, md_size) == 0)
+ if (id_len > 0 && !EVP_DigestUpdate(hash, id, id_len)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EVP_LIB);
goto done;
+ }
- if (EVP_DigestUpdate(hash, msg, msg_len) == 0)
+ if (!EC_GROUP_get_curve(group, p, a, b, ctx)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_EC_LIB);
goto done;
+ }
- /* reuse za buffer to hold H(ZA || M) */
- if (EVP_DigestFinal(hash, za, NULL) == 0)
+ p_bytes = BN_num_bytes(p);
+ buf = OPENSSL_zalloc(p_bytes);
+ if (buf == NULL) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_MALLOC_FAILURE);
goto done;
+ }
- e = BN_bin2bn(za, md_size, NULL);
+ if (BN_bn2binpad(a, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || BN_bn2binpad(b, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || !EC_POINT_get_affine_coordinates(group,
+ EC_GROUP_get0_generator(group),
+ xG, yG, ctx)
+ || BN_bn2binpad(xG, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || BN_bn2binpad(yG, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || !EC_POINT_get_affine_coordinates(group,
+ EC_KEY_get0_public_key(key),
+ xA, yA, ctx)
+ || BN_bn2binpad(xA, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || BN_bn2binpad(yA, buf, p_bytes) < 0
+ || !EVP_DigestUpdate(hash, buf, p_bytes)
+ || !EVP_DigestFinal(hash, out, NULL)) {
+ SM2err(SM2_F_SM2_COMPUTE_Z_DIGEST, ERR_R_INTERNAL_ERROR);
+ goto done;
+ }
+
+ rc = 1;
done:
- OPENSSL_free(za);
+ OPENSSL_free(buf);
+ BN_CTX_free(ctx);
+ EVP_MD_CTX_free(hash);
+ return rc;
+}
+
+static BIGNUM *sm2_compute_msg_hash(const EVP_MD *digest,
+ const EC_KEY *key,
+ const uint8_t *id,
+ const size_t id_len,
+ const uint8_t *msg, size_t msg_len)
+{
+ EVP_MD_CTX *hash = EVP_MD_CTX_new();
+ const int md_size = EVP_MD_size(digest);
+ uint8_t *z = NULL;
+ BIGNUM *e = NULL;
+
+ if (md_size < 0) {
+ SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, SM2_R_INVALID_DIGEST);
+ goto done;
+ }
+
+ z = OPENSSL_zalloc(md_size);
+ if (hash == NULL || z == NULL) {
+ SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_MALLOC_FAILURE);
+ goto done;
+ }
+
+ if (!sm2_compute_z_digest(z, digest, id, id_len, key)) {
+ /* SM2err already called */
+ goto done;
+ }
+
+ if (!EVP_DigestInit(hash, digest)
+ || !EVP_DigestUpdate(hash, z, md_size)
+ || !EVP_DigestUpdate(hash, msg, msg_len)
+ /* reuse z buffer to hold H(Z || M) */
+ || !EVP_DigestFinal(hash, z, NULL)) {
+ SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_EVP_LIB);
+ goto done;
+ }
+
+ e = BN_bin2bn(z, md_size, NULL);
+ if (e == NULL)
+ SM2err(SM2_F_SM2_COMPUTE_MSG_HASH, ERR_R_INTERNAL_ERROR);
+
+ done:
+ OPENSSL_free(z);
EVP_MD_CTX_free(hash);
return e;
}
-static
-ECDSA_SIG *SM2_sig_gen(const EC_KEY *key, const BIGNUM *e)
+static ECDSA_SIG *sm2_sig_gen(const EC_KEY *key, const BIGNUM *e)
{
const BIGNUM *dA = EC_KEY_get0_private_key(key);
const EC_GROUP *group = EC_KEY_get0_group(key);
const BIGNUM *order = EC_GROUP_get0_order(group);
-
ECDSA_SIG *sig = NULL;
EC_POINT *kG = NULL;
BN_CTX *ctx = NULL;
BIGNUM *tmp = NULL;
kG = EC_POINT_new(group);
- if (kG == NULL)
- goto done;
-
ctx = BN_CTX_new();
- if (ctx == NULL)
+ if (kG == NULL || ctx == NULL) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
goto done;
+ }
BN_CTX_start(ctx);
-
k = BN_CTX_get(ctx);
rk = BN_CTX_get(ctx);
x1 = BN_CTX_get(ctx);
tmp = BN_CTX_get(ctx);
-
- if (tmp == NULL)
+ if (tmp == NULL) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
goto done;
+ }
- /* These values are returned and so should not be allocated out of the context */
+ /*
+ * These values are returned and so should not be allocated out of the
+ * context
+ */
r = BN_new();
s = BN_new();
- if (r == NULL || s == NULL)
+ if (r == NULL || s == NULL) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
goto done;
+ }
for (;;) {
- BN_priv_rand_range(k, order);
-
- if (EC_POINT_mul(group, kG, k, NULL, NULL, ctx) == 0)
- goto done;
-
- if (EC_POINT_get_affine_coordinates_GFp(group, kG, x1, NULL, ctx) == 0)
+ if (!BN_priv_rand_range(k, order)) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
goto done;
+ }
- if (BN_mod_add(r, e, x1, order, ctx) == 0)
+ if (!EC_POINT_mul(group, kG, k, NULL, NULL, ctx)
+ || !EC_POINT_get_affine_coordinates(group, kG, x1, NULL,
+ ctx)
+ || !BN_mod_add(r, e, x1, order, ctx)) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
goto done;
+ }
/* try again if r == 0 or r+k == n */
if (BN_is_zero(r))
continue;
- BN_add(rk, r, k);
+ if (!BN_add(rk, r, k)) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_INTERNAL_ERROR);
+ goto done;
+ }
if (BN_cmp(rk, order) == 0)
continue;
- BN_add(s, dA, BN_value_one());
- BN_mod_inverse(s, s, order, ctx);
-
- BN_mod_mul(tmp, dA, r, order, ctx);
- BN_sub(tmp, k, tmp);
-
- BN_mod_mul(s, s, tmp, order, ctx);
+ if (!BN_add(s, dA, BN_value_one())
+ || !ec_group_do_inverse_ord(group, s, s, ctx)
+ || !BN_mod_mul(tmp, dA, r, order, ctx)
+ || !BN_sub(tmp, k, tmp)
+ || !BN_mod_mul(s, s, tmp, order, ctx)) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_BN_LIB);
+ goto done;
+ }
sig = ECDSA_SIG_new();
-
- if (sig == NULL)
+ if (sig == NULL) {
+ SM2err(SM2_F_SM2_SIG_GEN, ERR_R_MALLOC_FAILURE);
goto done;
+ }
/* takes ownership of r and s */
ECDSA_SIG_set0(sig, r, s);
}
done:
-
if (sig == NULL) {
BN_free(r);
BN_free(s);
BN_CTX_free(ctx);
EC_POINT_free(kG);
return sig;
-
}
-static
-int SM2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig, const BIGNUM *e)
+static int sm2_sig_verify(const EC_KEY *key, const ECDSA_SIG *sig,
+ const BIGNUM *e)
{
int ret = 0;
const EC_GROUP *group = EC_KEY_get0_group(key);
const BIGNUM *order = EC_GROUP_get0_order(group);
BN_CTX *ctx = NULL;
EC_POINT *pt = NULL;
-
BIGNUM *t = NULL;
BIGNUM *x1 = NULL;
const BIGNUM *r = NULL;
const BIGNUM *s = NULL;
ctx = BN_CTX_new();
- if (ctx == NULL)
- goto done;
pt = EC_POINT_new(group);
- if (pt == NULL)
+ if (ctx == NULL || pt == NULL) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_MALLOC_FAILURE);
goto done;
+ }
BN_CTX_start(ctx);
-
t = BN_CTX_get(ctx);
x1 = BN_CTX_get(ctx);
-
- if (x1 == NULL)
+ if (x1 == NULL) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_MALLOC_FAILURE);
goto done;
+ }
/*
- B1: verify whether r' in [1,n-1], verification failed if not
- B2: vefify whether s' in [1,n-1], verification failed if not
- B3: set M'~=ZA || M'
- B4: calculate e'=Hv(M'~)
- B5: calculate t = (r' + s') modn, verification failed if t=0
- B6: calculate the point (x1', y1')=[s']G + [t]PA
- B7: calculate R=(e'+x1') modn, verfication pass if yes, otherwise failed
+ * B1: verify whether r' in [1,n-1], verification failed if not
+ * B2: vefify whether s' in [1,n-1], verification failed if not
+ * B3: set M'~=ZA || M'
+ * B4: calculate e'=Hv(M'~)
+ * B5: calculate t = (r' + s') modn, verification failed if t=0
+ * B6: calculate the point (x1', y1')=[s']G + [t]PA
+ * B7: calculate R=(e'+x1') modn, verfication pass if yes, otherwise failed
*/
ECDSA_SIG_get0(sig, &r, &s);
- if (BN_cmp(r, BN_value_one()) < 0)
- goto done;
- if (BN_cmp(s, BN_value_one()) < 0)
- goto done;
-
- if (BN_cmp(order, r) <= 0)
- goto done;
- if (BN_cmp(order, s) <= 0)
- goto done;
-
- if (BN_mod_add(t, r, s, order, ctx) == 0)
+ if (BN_cmp(r, BN_value_one()) < 0
+ || BN_cmp(s, BN_value_one()) < 0
+ || BN_cmp(order, r) <= 0
+ || BN_cmp(order, s) <= 0) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, SM2_R_BAD_SIGNATURE);
goto done;
+ }
- if (BN_is_zero(t) == 1)
+ if (!BN_mod_add(t, r, s, order, ctx)) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_BN_LIB);
goto done;
+ }
- if (EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx) == 0)
+ if (BN_is_zero(t)) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, SM2_R_BAD_SIGNATURE);
goto done;
+ }
- if (EC_POINT_get_affine_coordinates_GFp(group, pt, x1, NULL, ctx) == 0)
+ if (!EC_POINT_mul(group, pt, s, EC_KEY_get0_public_key(key), t, ctx)
+ || !EC_POINT_get_affine_coordinates(group, pt, x1, NULL, ctx)) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_EC_LIB);
goto done;
+ }
- if (BN_mod_add(t, e, x1, order, ctx) == 0)
+ if (!BN_mod_add(t, e, x1, order, ctx)) {
+ SM2err(SM2_F_SM2_SIG_VERIFY, ERR_R_BN_LIB);
goto done;
+ }
if (BN_cmp(r, t) == 0)
ret = 1;
return ret;
}
-ECDSA_SIG *SM2_do_sign(const EC_KEY *key,
+ECDSA_SIG *sm2_do_sign(const EC_KEY *key,
const EVP_MD *digest,
- const char *user_id, const uint8_t *msg, size_t msg_len)
+ const uint8_t *id,
+ const size_t id_len,
+ const uint8_t *msg, size_t msg_len)
{
BIGNUM *e = NULL;
ECDSA_SIG *sig = NULL;
- e = compute_msg_hash(digest, key, user_id, msg, msg_len);
- if (e == NULL)
+ e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len);
+ if (e == NULL) {
+ /* SM2err already called */
goto done;
+ }
- sig = SM2_sig_gen(key, e);
+ sig = sm2_sig_gen(key, e);
done:
BN_free(e);
return sig;
}
-int SM2_do_verify(const EC_KEY *key,
+int sm2_do_verify(const EC_KEY *key,
const EVP_MD *digest,
const ECDSA_SIG *sig,
- const char *user_id, const uint8_t *msg, size_t msg_len)
+ const uint8_t *id,
+ const size_t id_len,
+ const uint8_t *msg, size_t msg_len)
{
BIGNUM *e = NULL;
- int ret = -1;
+ int ret = 0;
- e = compute_msg_hash(digest, key, user_id, msg, msg_len);
- if (e == NULL)
+ e = sm2_compute_msg_hash(digest, key, id, id_len, msg, msg_len);
+ if (e == NULL) {
+ /* SM2err already called */
goto done;
+ }
- ret = SM2_sig_verify(key, sig, e);
+ ret = sm2_sig_verify(key, sig, e);
done:
BN_free(e);
return ret;
}
-int SM2_sign(int type, const unsigned char *dgst, int dgstlen,
+int sm2_sign(const unsigned char *dgst, int dgstlen,
unsigned char *sig, unsigned int *siglen, EC_KEY *eckey)
{
BIGNUM *e = NULL;
ECDSA_SIG *s = NULL;
+ int sigleni;
int ret = -1;
- if (type != NID_sm3)
- goto done;
-
- if (dgstlen != 32) /* expected length of SM3 hash */
- goto done;
-
e = BN_bin2bn(dgst, dgstlen, NULL);
+ if (e == NULL) {
+ SM2err(SM2_F_SM2_SIGN, ERR_R_BN_LIB);
+ goto done;
+ }
- s = SM2_sig_gen(eckey, e);
-
- *siglen = i2d_ECDSA_SIG(s, &sig);
+ s = sm2_sig_gen(eckey, e);
- ECDSA_SIG_free(s);
+ sigleni = i2d_ECDSA_SIG(s, &sig);
+ if (sigleni < 0) {
+ SM2err(SM2_F_SM2_SIGN, ERR_R_INTERNAL_ERROR);
+ goto done;
+ }
+ *siglen = (unsigned int)sigleni;
- ret = 0;
+ ret = 1;
done:
ECDSA_SIG_free(s);
return ret;
}
-int SM2_verify(int type, const unsigned char *dgst, int dgstlen,
+int sm2_verify(const unsigned char *dgst, int dgstlen,
const unsigned char *sig, int sig_len, EC_KEY *eckey)
{
ECDSA_SIG *s = NULL;
int derlen = -1;
int ret = -1;
- if (type != NID_sm3)
- goto done;
-
s = ECDSA_SIG_new();
- if (s == NULL)
+ if (s == NULL) {
+ SM2err(SM2_F_SM2_VERIFY, ERR_R_MALLOC_FAILURE);
goto done;
- if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
+ }
+ if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL) {
+ SM2err(SM2_F_SM2_VERIFY, SM2_R_INVALID_ENCODING);
goto done;
+ }
/* Ensure signature uses DER and doesn't have trailing garbage */
derlen = i2d_ECDSA_SIG(s, &der);
- if (derlen != sig_len || memcmp(sig, der, derlen) != 0)
+ if (derlen != sig_len || memcmp(sig, der, derlen) != 0) {
+ SM2err(SM2_F_SM2_VERIFY, SM2_R_INVALID_ENCODING);
goto done;
+ }
e = BN_bin2bn(dgst, dgstlen, NULL);
+ if (e == NULL) {
+ SM2err(SM2_F_SM2_VERIFY, ERR_R_BN_LIB);
+ goto done;
+ }
- ret = SM2_sig_verify(eckey, s, e);
+ ret = sm2_sig_verify(eckey, s, e);
done:
OPENSSL_free(der);
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