diff options
| -rw-r--r-- | crypto/sm2/sm2_crypt.c | 23 | ||||
| -rw-r--r-- | crypto/sm2/sm2_pmeth.c | 2 | ||||
| -rw-r--r-- | include/crypto/sm2.h | 3 | ||||
| -rw-r--r-- | test/sm2_internal_test.c | 2 |
4 files changed, 10 insertions, 20 deletions
diff --git a/crypto/sm2/sm2_crypt.c b/crypto/sm2/sm2_crypt.c index ef505f6441..1188abfc6b 100644 --- a/crypto/sm2/sm2_crypt.c +++ b/crypto/sm2/sm2_crypt.c @@ -61,29 +61,20 @@ static size_t ec_field_size(const EC_GROUP *group) return field_size; } -int sm2_plaintext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len, - size_t *pt_size) +int sm2_plaintext_size(const unsigned char *ct, size_t ct_size, size_t *pt_size) { - const size_t field_size = ec_field_size(EC_KEY_get0_group(key)); - const int md_size = EVP_MD_size(digest); - size_t overhead; + struct SM2_Ciphertext_st *sm2_ctext = NULL; - if (md_size < 0) { - SM2err(SM2_F_SM2_PLAINTEXT_SIZE, SM2_R_INVALID_DIGEST); - return 0; - } - if (field_size == 0) { - SM2err(SM2_F_SM2_PLAINTEXT_SIZE, SM2_R_INVALID_FIELD); - return 0; - } + sm2_ctext = d2i_SM2_Ciphertext(NULL, &ct, ct_size); - overhead = 10 + 2 * field_size + (size_t)md_size; - if (msg_len <= overhead) { + if (sm2_ctext == NULL) { SM2err(SM2_F_SM2_PLAINTEXT_SIZE, SM2_R_INVALID_ENCODING); return 0; } - *pt_size = msg_len - overhead; + *pt_size = sm2_ctext->C2->length; + SM2_Ciphertext_free(sm2_ctext); + return 1; } diff --git a/crypto/sm2/sm2_pmeth.c b/crypto/sm2/sm2_pmeth.c index b42a14c32f..27025fbf3a 100644 --- a/crypto/sm2/sm2_pmeth.c +++ b/crypto/sm2/sm2_pmeth.c @@ -151,7 +151,7 @@ static int pkey_sm2_decrypt(EVP_PKEY_CTX *ctx, const EVP_MD *md = (dctx->md == NULL) ? EVP_sm3() : dctx->md; if (out == NULL) { - if (!sm2_plaintext_size(ec, md, inlen, outlen)) + if (!sm2_plaintext_size(in, inlen, outlen)) return -1; else return 1; diff --git a/include/crypto/sm2.h b/include/crypto/sm2.h index 76ee80baff..50851a83ce 100644 --- a/include/crypto/sm2.h +++ b/include/crypto/sm2.h @@ -60,8 +60,7 @@ int sm2_verify(const unsigned char *dgst, int dgstlen, int sm2_ciphertext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len, size_t *ct_size); -int sm2_plaintext_size(const EC_KEY *key, const EVP_MD *digest, size_t msg_len, - size_t *pt_size); +int sm2_plaintext_size(const unsigned char *ct, size_t ct_size, size_t *pt_size); int sm2_encrypt(const EC_KEY *key, const EVP_MD *digest, diff --git a/test/sm2_internal_test.c b/test/sm2_internal_test.c index 2bb73947ff..41827bb82f 100644 --- a/test/sm2_internal_test.c +++ b/test/sm2_internal_test.c @@ -185,7 +185,7 @@ static int test_sm2_crypt(const EC_GROUP *group, if (!TEST_mem_eq(ctext, ctext_len, expected, ctext_len)) goto done; - if (!TEST_true(sm2_plaintext_size(key, digest, ctext_len, &ptext_len)) + if (!TEST_true(sm2_plaintext_size(ctext, ctext_len, &ptext_len)) || !TEST_int_eq(ptext_len, msg_len)) goto done; |