diff options
Diffstat (limited to 'crypto/sm2/sm2_crypt.c')
| -rw-r--r-- | crypto/sm2/sm2_crypt.c | 29 |
1 files changed, 12 insertions, 17 deletions
diff --git a/crypto/sm2/sm2_crypt.c b/crypto/sm2/sm2_crypt.c index ef505f64412b..83b97f4edc88 100644 --- a/crypto/sm2/sm2_crypt.c +++ b/crypto/sm2/sm2_crypt.c @@ -1,5 +1,5 @@ /* - * Copyright 2017-2018 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved. * Copyright 2017 Ribose Inc. All Rights Reserved. * Ported from Ribose contributions from Botan. * @@ -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; } @@ -303,6 +294,10 @@ int sm2_decrypt(const EC_KEY *key, C2 = sm2_ctext->C2->data; C3 = sm2_ctext->C3->data; msg_len = sm2_ctext->C2->length; + if (*ptext_len < (size_t)msg_len) { + SM2err(SM2_F_SM2_DECRYPT, SM2_R_BUFFER_TOO_SMALL); + goto done; + } ctx = BN_CTX_new(); if (ctx == NULL) { |