C语言openssl aes-128-ecb加解密 opensslaes加密解密c

【C语言openssl aes-128-ecb加解密】openssl aes-128-ecb方式对密码进行md5后的加解密
openssl版本：1.0.2g 其他的自行验证
编译：gcc aes_128_ecb.c -o aes_128_ecb -lssl -lcrypto

执行结果： ./aes_128_ecb passwd: 12345 strMd516: A46B755EA8F1B4DD strBase64Encrypt: cFeeVowosk4cR5gIg7i6ZQ== aes_128_ecb_decrypt OK strAESDecrypt passwd is: 12345

/********************************************* **aes_128_ecb.c **encrypte decrypt the password *********************************************/ #include #include #include #include #include #include #include #include int aes_128_ecb_encrypt(char *in, char *key, char *out) { int ret = 0, len = 0, len1 = 0, len2 = 0; unsigned char *result = NULL; EVP_CIPHER_CTX *ctx; ctx = EVP_CIPHER_CTX_new(); ret = EVP_EncryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, (const unsigned char*)key, NULL); if (ret != 1) { printf("EVP_EncryptInit_ex error\n"); EVP_CIPHER_CTX_free(ctx); return 0; } result = (unsigned char *)malloc(AES_BLOCK_SIZE*64); ret = EVP_EncryptUpdate(ctx, result, &len1, (const unsigned char*)in, strlen(in)); if (ret != 1) { printf("EVP_EncryptUpdate error\n"); EVP_CIPHER_CTX_free(ctx); free(result); return 0; } ret = EVP_EncryptFinal_ex(ctx, result + len1, &len2); if (ret != 1) { printf("EVP_EncryptFinal_ex error\n"); EVP_CIPHER_CTX_free(ctx); free(result); return 0; }while (len < (len1+len2)) { out[len] = result[len]; len++; } EVP_CIPHER_CTX_free(ctx); free(result); return (len1+len2); } int aes_128_ecb_decrypt(char *in, char *key, char *out) { int ret = 0, len = 0, len1 = 0, len2 = 0; unsigned char *result = NULL; EVP_CIPHER_CTX *ctx; ctx = EVP_CIPHER_CTX_new(); ret = EVP_DecryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, (const unsigned char*)key, NULL); if (ret != 1) { printf("EVP_DecryptInit_ex error\n"); EVP_CIPHER_CTX_free(ctx); return 0; } result = (unsigned char *)malloc(AES_BLOCK_SIZE*64); ret = EVP_DecryptUpdate(ctx, result, &len1, (const unsigned char*)in,get_str_len(in)); //不可使用strlen求取，字符串中可能含有结束符等if (ret != 1) { printf("EVP_DecryptUpdate error\n"); EVP_CIPHER_CTX_free(ctx); free(result); return 0; } ret = EVP_DecryptFinal_ex(ctx, result + len1, &len2); if (ret != 1) { printf("EVP_DecryptFinal_ex error\n"); EVP_CIPHER_CTX_free(ctx); free(result); return 0; } while (len < (len1+len2)) { out[len] = result[len]; len++; } EVP_CIPHER_CTX_free(ctx); free(result); return 1; } // base64 编码 char *base64_encode(const char *buffer, int length) { BIO *bmem = NULL; BIO *b64 = NULL; BUF_MEM *bptr; char *buff = NULL; b64 = BIO_new(BIO_f_base64()); BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); bmem = BIO_new(BIO_s_mem()); b64 = BIO_push(b64, bmem); BIO_write(b64, buffer, length); BIO_flush(b64); BIO_get_mem_ptr(b64, &bptr); BIO_set_close(b64, BIO_NOCLOSE); buff = (char *)malloc(bptr->length + 1); memcpy(buff, bptr->data, bptr->length); buff[bptr->length] = 0; BIO_free_all(b64); return buff; }// base64 解码 char *base64_decode(char *input, int length) { BIO *b64 = NULL; BIO *bmem = NULL; char *buffer = NULL; buffer = (char *)malloc(length); memset(buffer, 0, length); b64 = BIO_new(BIO_f_base64()); BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); bmem = BIO_new_mem_buf(input, length); bmem = BIO_push(b64, bmem); BIO_read(bmem, buffer, length); BIO_free_all(bmem); return buffer; }int md5_16(const char *src, char *out) { unsigned char c[MD5_DIGEST_LENGTH]; int i = 0; MD5_CTX ctx; MD5_Init(&ctx); MD5_Update(&ctx, src, strlen(src)); MD5_Final(c, &ctx); for (i = 0; i < MD5_DIGEST_LENGTH / 2; i++) { sprintf(out+i*2, "%02X", c[i+4]); } return 1; }int get_str_len(const char *in) { int num = 0; if(in == NULL) { return 0; } while (!((*(in + num) == NULL) && (*(in + num + 1) == NULL) \ && (*(in + num + 2) == NULL) && (*(in + num + 3) == NULL) \ && (*(in + num + 4) == NULL)&& (*(in + num + 5) == NULL) \ && (*(in + num + 6) == NULL)&& (*(in + num + 7) == NULL))) { num++; } return num; }int main(int argc, char const *argv[]) { char strAESEncrypt[1024] = {0}, strAESDecrypt[1024] = {0}, *strBase64Encrypt = NULL, *pStrBase64Decrypt = NULL, strMd516[17] = {0}; int nAESEncryptLen = 0; char strKey[128] = "0123456789ABCDEF"; char *passwd = "12345"; md5_16(strKey, strMd516); printf("passwd: %s\n", passwd); printf("strMd516: %s\n", strMd516); // 加密部分 nAESEncryptLen = aes_128_ecb_encrypt(passwd, strMd516, strAESEncrypt); strBase64Encrypt = base64_encode(strAESEncrypt, nAESEncryptLen); printf("strBase64Encrypt: %s\n", strBase64Encrypt); // 解密部分 pStrBase64Decrypt = base64_decode(strBase64Encrypt, strlen(strBase64Encrypt)); if (aes_128_ecb_decrypt(pStrBase64Decrypt, strMd516, strAESDecrypt) == 1) { printf("aes_128_ecb_decrypt OK\n"); printf("strAESDecrypt passwd is: %s\n", strAESDecrypt); }return 0; }