使用openssl的aes各种加密算法

#include <stdio.h>

#include <string.h>

#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <errno.h>

#include <stdlib.h>

#include <unistd.h>

#include <openssl/aes.h>

//g++ -g -o -Wall -m64 AesTest AesTest.cpp -lssl -lcrypto

//g++ -g -o -Wall AesTest AesTest.cpp -lssl -lcrypto

int main(int argc, char **argv)

{//由于与直接对接用的char，那么加解密要强制转换

    char Source[1024];

    char *InputData=NULL;

    char *EncryptData=NULL;

    char *DecryptData=NULL;

    unsigned char Key[AES_BLOCK_SIZE+1];    //建议用unsigned char

    unsigned char ivec[AES_BLOCK_SIZE];     //建议用unsigned char

    AES_KEY AesKey;

    int DataLen=0,SetDataLen=0, i;

    memset(Source, 0x00, sizeof(Source));

    strcpy(Source, "1234567890abcde");  //要加密的数据

    DataLen = strlen(Source);

    memset(Key, 0x00, sizeof(Key));

    memcpy(Key, "0123456789abcdef", AES_BLOCK_SIZE);

 // set the encryption length

    SetDataLen = 0;

    if ((DataLen%AES_BLOCK_SIZE) == 0)

    {

        SetDataLen = DataLen;

    }

    else

    {

        SetDataLen = ((DataLen/AES_BLOCK_SIZE)+1) * AES_BLOCK_SIZE;

    }

    printf("SetDataLen:%d...\n", SetDataLen);   //取16的倍数

    InputData = (char *)calloc(SetDataLen+1, sizeof(char));

    if(InputData == NULL)   //注意要SetDataLen+1

    {

        fprintf(stderr, "Unable to allocate memory for InputData\n");

        exit(-1);

    }

    memcpy(InputData, Source, DataLen);

    EncryptData = (char *)calloc(SetDataLen+1, sizeof(char));

    if(EncryptData == NULL) //注意要SetDataLen+1

    {

        fprintf(stderr, "Unable to allocate memory for EncryptData\n");

        exit(-1);

    }

    DecryptData = (char *)calloc(SetDataLen+1, sizeof(char));

    if(DecryptData == NULL) //注意要SetDataLen+1

    {

        fprintf(stderr, "Unable to allocate memory for DecryptData\n");

        exit(-1);

    }

    memset(&AesKey, 0x00, sizeof(AES_KEY));

    if(AES_set_encrypt_key(Key, 128, &AesKey) < 0)

    {//设置加密密钥

        fprintf(stderr, "Unable to set encryption key in AES...\n");

        exit(-1);

    }

    for(i=0; i<AES_BLOCK_SIZE; i++)

    {//必须要有

        ivec[i] = 0;

    }

    //加密

    AES_cbc_encrypt((unsigned char *)InputData, (unsigned char *)EncryptData,

        SetDataLen, &AesKey, ivec, AES_ENCRYPT);   

    memset(&AesKey, 0x00, sizeof(AES_KEY));

    if(AES_set_decrypt_key(Key, 128, &AesKey) < 0)

    {//设置解密密钥

        fprintf(stderr, "Unable to set encryption key in AES...\n");

        exit(-1);

    }

    for(i=0; i<AES_BLOCK_SIZE; i++)

    {//必须要有

        ivec[i] = 0;

    }

    //解密

    AES_cbc_encrypt((unsigned char *)EncryptData, (unsigned char *)DecryptData,

        SetDataLen, &AesKey, ivec, AES_DECRYPT); 

    printf("DecryptData:%s...\n", (char *)DecryptData);

    if(InputData != NULL)

    {

        free(InputData);

        InputData = NULL;

    }

    if(EncryptData != NULL)

    {

        free(EncryptData);

        EncryptData = NULL;

    }

    if(DecryptData != NULL)

    {

        free(DecryptData);

        DecryptData = NULL;

    }

    exit(0);

}

OpenSSL支持多种不同的加密算法

加密：

AES, Blowfish, Camellia, SEED, CAST-128, DES, IDEA, RC2, RC4, RC5, Triple DES, GOST 28147-89[4]

散列函数：

MD5, MD2, SHA-1, SHA-2, RIPEMD-160, MDC-2, GOST R 34.11-94[4]

公开密钥加密：

RSA, DSA, Diffie–Hellman key exchange, Elliptic curve, GOST R 34.10-2001[4]
巴特西

使用openssl的aes各种加密算法

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