openssl的AES加密（base64编码）

【 base64编码/解码】
AES加密后为乱码，使用base64编码后显示正常

/*************************************************Function:          base64EncodeDescription:        base64 编码Input:1.input          需编码的数据字符串2.length       实际长度（不可使用strlen求取，字符串中可能含有结束符等）3.newLineOutput:            Return:         转化后的字符串指针Others:
*************************************************/
char * base64Encode(const char *buffer, int length, bool newLine)
{BIO *bmem = NULL;BIO *b64 = NULL;BUF_MEM *bptr;b64 = BIO_new(BIO_f_base64());if (!newLine) {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);char *buff = (char *)malloc(bptr->length + 1);memcpy(buff, bptr->data, bptr->length);buff[bptr->length] = 0;BIO_free_all(b64);return buff;
}/*************************************************Function:            base64DecodeDescription:        base64 解码Input:1.input          需解码的数据字符串2.length       实际长度（不可使用strlen求取，字符串中可能含有结束符等）3.newLineOutput:            Return:         转化后的字符串指针Others:
*************************************************/
char * base64Decode(char *input, int length, bool newLine)
{BIO *b64 = NULL;BIO *bmem = NULL;char *buffer = (char *)malloc(length);memset(buffer, 0, length);b64 = BIO_new(BIO_f_base64());if (!newLine) {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;
}

【 AES加密/解密】
AES算法的块（block）的长度固定为16字节。假设一个字符串在AES加密前的长度为cleanLen，加密后的长度为cipherLen，则二者有下面的关系，其中的“/”是整除。

cipherLen = (clearLen/16 + 1) * 16
比如：（注意第二行，即使48刚好能被16整除，也要额外追加一个16字节的块）

clearLen	cipherLen
47	48
48	64
49	64

#define AES_DEBUG/*************************************************Function:         aes_ecb_pkcs5padding_encryptDescription:        AES加密Input:Output:          Return:         Others:
*************************************************/
int aes_ecb_pkcs5padding_encrypt(const char *in, char *out, const unsigned char *key, const int keybits)
{AES_KEY aes;unsigned char *input_string;unsigned char *encrypt_string;unsigned int surplus_len;char b; char *tmp_out;const char *tmp_in;int encrypt_quit = 0;if(in == NULL || out == NULL){#ifdef AES_DEBUGprintf("[%s] [%d] \"in\" or \"out\" point error!!\n", __FILE__, __LINE__);#endif}input_string = (unsigned char*)calloc(AES_BLOCK_SIZE, sizeof(unsigned char));if (input_string == NULL) {#ifdef AES_DEBUGprintf("[%s] [%d] input_string error!!\n", __FILE__, __LINE__);#endiffprintf(stderr, "Unable to allocate memory for input_string\n");exit(-1);}encrypt_string = (unsigned char*)calloc(AES_BLOCK_SIZE, sizeof(unsigned char));if (encrypt_string == NULL) {#ifdef AES_DEBUGprintf("[%s] [%d] encrypt_string error!!\n", __FILE__, __LINE__);#endiffprintf(stderr, "Unable to allocate memory for encrypt_string\n");return -1;}memset(encrypt_string, 0, AES_BLOCK_SIZE);// set encrypt keyif (AES_set_encrypt_key(key, 128, &aes) < 0) {#ifdef AES_DEBUGprintf("[%s] [%d] AES_set_encrypt_key error!!\n", __FILE__, __LINE__);#endiffprintf(stderr, "Unable to set encryption key in AES\n");return -1;}tmp_in = in;tmp_out = out;while(!encrypt_quit){if(strlen(tmp_in) == 0){#ifdef AES_DEBUGprintf("[%s] [%d] (strlen(tmp_in) == 0) \n", __FILE__, __LINE__);#endifsurplus_len = AES_BLOCK_SIZE;b = '\0'+surplus_len;memset(input_string, b, AES_BLOCK_SIZE);encrypt_quit = 1;}else if(strlen(tmp_in)/AES_BLOCK_SIZE > 0){#ifdef AES_DEBUGprintf("[%s] [%d] (strlen(tmp_in)/AES_BLOCK_SIZE > 0) \n", __FILE__, __LINE__);#endifmemcpy(input_string, tmp_in, AES_BLOCK_SIZE);}else{// daisy 加密数据应为16字节的整数倍，若不是则需填充。//填充方式为:surplus_len = AES_BLOCK_SIZE - (strlen(tmp_in)%AES_BLOCK_SIZE)//(即以所需不齐的数值作为填充值，填充剩余空缺)#ifdef AES_DEBUGprintf("[%s] [%d] else \n", __FILE__, __LINE__);#endifsurplus_len = AES_BLOCK_SIZE - (strlen(tmp_in)%AES_BLOCK_SIZE);b = '\0'+surplus_len;memset(input_string, b, AES_BLOCK_SIZE);memcpy(input_string, tmp_in, strlen(tmp_in));encrypt_quit = 1;}#ifdef AES_DEBUGprintf("input_string: %s\n", input_string);#endifmemset(encrypt_string, 0, AES_BLOCK_SIZE);AES_ecb_encrypt(input_string, encrypt_string, &aes, AES_ENCRYPT);#ifdef AES_DEBUGprintf("encrypt_string: %s\n", encrypt_string);#endifmemcpy(tmp_out, encrypt_string, AES_BLOCK_SIZE);tmp_out += AES_BLOCK_SIZE;tmp_in += AES_BLOCK_SIZE;}free(input_string);free(encrypt_string);return 0;
}/*************************************************Function:            aes_ecb_pkcs5padding_decryptDescription:        AES解密Input:Output:          Return:         Others:
*************************************************/
int aes_ecb_pkcs5padding_decrypt(char* in, char* key, char* out)
{if(!in || !key || !out) return 0;AES_KEY aes;if(AES_set_decrypt_key((unsigned char*)key, 128, &aes) < 0){return 0;}int len=strlen(in), en_len=0;while(en_len<len){AES_decrypt((unsigned char*)in, (unsigned char*)out, &aes);in+=AES_BLOCK_SIZE;out+=AES_BLOCK_SIZE;en_len+=AES_BLOCK_SIZE;}return 1;
}

【坑】
AES加密后的实际长度（不可使用strlen求取，字符串中可能含有结束符等）
简单粗暴的方法。判断从当前指针指向的字符开始，往后3位均为空，则判定当前到达字符串末尾

【实际调用接口】

#include <openssl/pem.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/bio.h>
#include <openssl/buffer.h>
#include "openssl/aes.h"void main()
{int num = 0;const unsigned char *aes_key = "1234567890123456";const char *data = "laodainiubi123456789";// 加密的数据char aes_encrypt_out[256];char aes_decrypt_out[256];memset(aes_encrypt_out, 0, sizeof(aes_encrypt_out));memset(aes_decrypt_out, 0, sizeof(aes_decrypt_out));printf("data = %s \n", data);aes_ecb_pkcs5padding_encrypt(data, aes_encrypt_out, aes_key, strlen(aes_key)*8);printf("aes_encrypt_out = %s  \n", aes_encrypt_out);// daisy 实际长度（不可使用strlen求取，字符串中可能含有结束符等）// 简单粗暴的方法。判断从当前指针指向的字符开始，往后3位均为空，则判定当前到达字符串末尾while(!((*(aes_encrypt_out + num) == NULL) && (*(aes_encrypt_out + num + 1) == NULL) \&& (*(aes_encrypt_out + num + 2) == NULL) && (*(aes_encrypt_out + num + 3) == NULL))){//      printf("*(aes_encrypt_out + %d) = %c \n", num, *(aes_encrypt_out + num));num++;}printf("num = %d \n", num);char * encode = base64Encode(aes_encrypt_out, num, false);printf("after base64Encode:%s\n", encode);char * decode = base64Decode(encode, strlen(encode), false);printf("after base64Decode:%s\n", decode);aes_ecb_pkcs5padding_decrypt(decode, aes_key, aes_decrypt_out);printf("aes_decrypt_out = %s  \n", aes_decrypt_out);
}

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openssl的AES加密（base64编码）

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