c语言(openssl)实现rsa/none/pcks1padding算法，匹配java后端

前一篇文章:http://blog.csdn.net/qq372848728/article/details/78687876

int rsa_key_encrypt(EVP_PKEY *key, const unsigned char *orig_data, size_t orig_data_len,    unsigned char *enc_data, size_t &enc_data_len){    EVP_PKEY_CTX *ctx = NULL;    OpenSSL_add_all_ciphers();    ctx = EVP_PKEY_CTX_new(key, NULL);    if (NULL == ctx)    {        printf("ras_pubkey_encryptfailed to open ctx.\n");        EVP_PKEY_free(key);        return -1;    }    if (EVP_PKEY_encrypt_init(ctx) <= 0)    {        printf("ras_pubkey_encryptfailed to EVP_PKEY_encrypt_init.\n");        EVP_PKEY_free(key);        return -1;    }    int ret = EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING);    if (!ret) {        printf("set padding error!");        return 0;    }    //EVP_CIPHER_CTX_set_padding(ctx, EVP_CIPH_NO_PADDING);    if (EVP_PKEY_encrypt(ctx,        enc_data,        &enc_data_len,        orig_data,        orig_data_len) <= 0)    {        printf("ras_pubkey_encryptfailed to EVP_PKEY_encrypt.\n");        EVP_PKEY_CTX_free(ctx);        EVP_PKEY_free(key);        return -1;    }    EVP_PKEY_CTX_free(ctx);    EVP_PKEY_free(key);    return 0;}// 使用密钥解密，这种封装格式只适用公钥加密，私钥解密，这里key必须是私钥  int rsa_key_decrypt(EVP_PKEY *key, const unsigned char *enc_data, size_t enc_data_len,    unsigned char *orig_data, size_t &orig_data_len){    EVP_PKEY_CTX *ctx = NULL;    OpenSSL_add_all_ciphers();    ctx = EVP_PKEY_CTX_new(key, NULL);    if (NULL == ctx)    {        printf("ras_prikey_decryptfailed to open ctx.\n");        EVP_PKEY_free(key);        return -1;    }    if (EVP_PKEY_decrypt_init(ctx) <= 0)    {        printf("ras_prikey_decryptfailed to EVP_PKEY_decrypt_init.\n");        EVP_PKEY_free(key);        return -1;    }    int ret = EVP_PKEY_CTX_set_rsa_padding(ctx, RSA_PKCS1_PADDING);    if (ret = EVP_PKEY_decrypt(ctx,        orig_data,        &orig_data_len,        enc_data,        enc_data_len) <= 0)    {        printf("ras_prikey_decryptfailed to EVP_PKEY_decrypt.\n");        EVP_PKEY_CTX_free(ctx);        EVP_PKEY_free(key);        return -1;    }    EVP_PKEY_CTX_free(ctx);    EVP_PKEY_free(key);    return 0;}EVP_PKEY *generatePubEVPKEY(char * keyChar) {    int ret, flen, bio_len;    BIO *bio = NULL;    RSA *r = NULL;    if ((bio = BIO_new_mem_buf((void *)keyChar, strlen(keyChar))) == NULL)       //从字符串读取RSA公钥    {        //LOGE("BIO_new_mem_buf failed!\n");    }    PEM_read_bio_RSA_PUBKEY(bio, &r, 0, 0);    flen = RSA_size(r);    EVP_PKEY *evp_key = EVP_PKEY_new();//新建一个EVP_PKEY变量    if (evp_key == NULL)    {        RSA_free(r);        return NULL;    }    if (EVP_PKEY_set1_RSA(evp_key, r) != 1)  //保存RSA结构体到EVP_PKEY结构体    {        RSA_free(r);        EVP_PKEY_free(evp_key);        return NULL;    }    RSA_free(r);    return evp_key;}extern EVP_PKEY *generatePriEVPKEY(char *keyChar) {    int ret, flen, bio_len;    BIO *bio = NULL;    RSA *r = NULL;    if ((bio = BIO_new_mem_buf((void *)keyChar, strlen(keyChar))) == NULL)       //从字符串读取RSA公钥    {        //LOGE("BIO_new_mem_buf failed!\n");    }    PEM_read_bio_RSAPrivateKey(bio, &r, 0, 0);    flen = RSA_size(r);    EVP_PKEY *evp_key = EVP_PKEY_new();//新建一个EVP_PKEY变量    if (evp_key == NULL)    {        RSA_free(r);        return NULL;    }    if (EVP_PKEY_set1_RSA(evp_key, r) != 1)  //保存RSA结构体到EVP_PKEY结构体    {        RSA_free(r);        EVP_PKEY_free(evp_key);        return NULL;    }    RSA_free(r);    return evp_key;}

EVP_PKEY *pub_key = generatePubEVPKEY(pubkey1024);//新建一个EVP_PKEY变量
EVP_PKEY *pri_key = generatePriEVPKEY(prikey1024);
调用rsa_key_decrypt/rsa_key_encrypt两个函数即可加解密