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Update SM2 ecdh api

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This commit is contained in:
Zhi Guan
2023-01-13 09:40:32 +08:00
parent c932069224
commit fd88d8cad6
4 changed files with 23 additions and 6 deletions
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3
include/gmssl/sm2.h
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@@ -365,7 +365,8 @@ int sm2_do_encrypt_fixlen(const SM2_KEY *key, const uint8_t *in, size_t inlen, i
int sm2_encrypt_fixlen(const SM2_KEY *key, const uint8_t *in, size_t inlen, int point_size, uint8_t *out, size_t *outlen);
int sm2_ecdh(const SM2_KEY *key, const SM2_POINT *peer_public, SM2_POINT *out);
int sm2_do_ecdh(const SM2_KEY *key, const SM2_POINT *peer_public, SM2_POINT *out);
int sm2_ecdh(const SM2_KEY *key, const uint8_t *peer_public, size_t peer_public_len, SM2_POINT *out);
typedef uint8_t sm2_bn_t[32];

18
src/sm2_lib.c
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@@ -814,7 +814,7 @@ int sm2_decrypt(const SM2_KEY *key, const uint8_t *in, size_t inlen, uint8_t *ou
return 1;
}
int sm2_ecdh(const SM2_KEY *key, const SM2_POINT *peer_public, SM2_POINT *out)
int sm2_do_ecdh(const SM2_KEY *key, const SM2_POINT *peer_public, SM2_POINT *out)
{
if (!key || !peer_public || !out) {
error_print();
@@ -827,6 +827,22 @@ int sm2_ecdh(const SM2_KEY *key, const SM2_POINT *peer_public, SM2_POINT *out)
return 1;
}
int sm2_ecdh(const SM2_KEY *key, const uint8_t *peer_public, size_t peer_public_len, SM2_POINT *out)
{
SM2_POINT point;
if (sm2_point_from_octets(&point, peer_public, peer_public_len) != 1) {
error_print();
return -1;
}
if (sm2_do_ecdh(key, &point, out) != 1) {
error_print();
return -1;
}
return 1;
}
// (x1, y1) = k * G
// r = e + x1
// s = (k - r * d)/(1 + d) = (k +r - r * d - r)/(1 + d) = (k + r - r(1 +d))/(1 + d) = (k + r)/(1 + d) - r

4
src/tls12.c
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@@ -472,7 +472,7 @@ int tls12_do_connect(TLS_CONNECT *conn)
tls_trace("generate secrets\n");
SM2_KEY client_ecdh;
sm2_key_generate(&client_ecdh);
sm2_ecdh(&client_ecdh, &server_ecdhe_public, &server_ecdhe_public);
sm2_do_ecdh(&client_ecdh, &server_ecdhe_public, &server_ecdhe_public);
memcpy(pre_master_secret, &server_ecdhe_public, 32); // 这个做法很不优雅
// ECDHE和ECC的PMS结构是不一样的吗？
@@ -942,7 +942,7 @@ int tls12_do_accept(TLS_CONNECT *conn)
// generate secrets
tls_trace("generate secrets\n");
sm2_ecdh(&server_ecdhe_key, &client_ecdhe_point, &client_ecdhe_point);
sm2_do_ecdh(&server_ecdhe_key, &client_ecdhe_point, &client_ecdhe_point);
memcpy(pre_master_secret, (uint8_t *)&client_ecdhe_point, 32); // 这里应该修改一下表示方式，比如get_xy()
tls_prf(pre_master_secret, 32, "master secret",
client_random, 32, server_random, 32,

4
src/tls13.c
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@@ -1564,7 +1564,7 @@ int tls13_do_connect(TLS_CONNECT *conn)
uint8_t client_write_iv[12]
uint8_t server_write_iv[12]
*/
sm2_ecdh(&client_ecdhe, &server_ecdhe_public, &server_ecdhe_public);
sm2_do_ecdh(&client_ecdhe, &server_ecdhe_public, &server_ecdhe_public);
/* [1] */ tls13_hkdf_extract(digest, zeros, psk, early_secret);
/* [5] */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret);
/* [6] */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&server_ecdhe_public, handshake_secret);
@@ -2042,7 +2042,7 @@ int tls13_do_accept(TLS_CONNECT *conn)
digest_update(&dgst_ctx, record + 5, recordlen - 5);
sm2_ecdh(&server_ecdhe, &client_ecdhe_public, &client_ecdhe_public);
sm2_do_ecdh(&server_ecdhe, &client_ecdhe_public, &client_ecdhe_public);
/* 1 */ tls13_hkdf_extract(digest, zeros, psk, early_secret);
/* 5 */ tls13_derive_secret(early_secret, "derived", &null_dgst_ctx, handshake_secret);
/* 6 */ tls13_hkdf_extract(digest, handshake_secret, (uint8_t *)&client_ecdhe_public, handshake_secret);