我正在实现RSA算法,在该算法中,我分别从.crt和.pem证书读取公共和私有密钥。它可以正确加密数据,但问题出在解密上。有时它可以很好地解密,有时它会出现以下错误:
解密消息时出错:error:04099079:rsa 例程:RSA_padding_check_PKCS1_OAEP_mgf1:oaep解码错误。
如果满足以下条件,则解密失败
if ((decrypt_len = RSA_private_decrypt(strlen(c), (unsigned char*)c,
(unsigned char*)decrypt, rsa, RSA_PKCS1_OAEP_PADDING)) == -1)
代码块如下:
void DecryptRSA(const char *message)
{
char *privateCertPath = "privateCertificate.pem";
const char *msg = message; //message in base64 characters
BIO *bo = BIO_new_file(privateCertPath, "rb");
EVP_PKEY *pri;
OpenSSL_add_all_algorithms();
pri = PEM_read_bio_PrivateKey(bo, NULL, NULL, NULL);
if (pri == NULL) {
/* Error */
}
RSA* rsa = EVP_PKEY_get1_RSA(pri);
unsigned char *decrypt = (unsigned char *) malloc(RSA_size(rsa));
int decrypt_len;
char *err = (char *) malloc(130);
string msgascii = base64_decode(msg); //converting
const char *c = msgascii.c_str();
if ((decrypt_len = RSA_private_decrypt(strlen(c), (unsigned char*)c,
(unsigned char*)decrypt, rsa, RSA_PKCS1_OAEP_PADDING)) == -1)
{
ERR_load_crypto_strings();
ERR_error_string(ERR_get_error(), err);
fprintf(stderr, "Error decrypting message: %s\n", err);
}
printf("%s", decrypt);
RSA_free(rsa);
BIO_free(bo);
free((char*)msg);
free((char*)c);
free(decrypt);
free(err);
}
答案 0 :(得分:1)
在if条件中使用strlen(c)导致当加密字符包含空字符时char数组终止,所以我改用msgascii.size()来解决问题。