c实现AES 128位加解密

//对应java的SecureRandom随机密钥 bool sha1prng_key(string str,char *out) { unsigned char result[20];

SHA1((unsigned char*)str.c_str(), strlen(str.c_str()), (unsigned char*)&result); SHA1((unsigned char*)&result, 20, (unsigned char*)&result); for (int i = 0; i < 20; i++) { //cout << hex << i; printf("x ", result[i]&0xFF); } cout << endl; memcpy(out,result,16); return true;

}

//AES/ECB/PKCS5Padding int padding(char *szIn,int len,char *szOut) { //补齐长度为16的倍数 int iC = 16-len;

memcpy(szOut,szIn,len); memset(&szOut[len],iC,iC); return len+iC;

}

//AES/ECB/PKCS5Padding int unpadding(char *szIn,int len,char *szOut) { //去掉补位字节 int iC = (int)szIn[len-1];

memcpy(szOut,szIn,len); memset(&szOut[len-iC],0x0,iC); return len-iC;

}

/********************************************************** 函数名：aes_encrypt 参数：const char* str_in --输入字符 参数：unsigned char* key --key 参数：unsigned char* out --输出字符 返回值:int --0失败 1成功 说明：加密 ********************************************************/ int aes_encrypt(char str_in,int inLen, char key, char out) { char szKey[128];memset(szKey,0x0,sizeof(szKey)); sha1prng_key(key,szKey);

Auto_Pointer_pri app(inLen+32); int len = padding(str_in,inLen,app.v_ptr); printf("padding ...\n"); for (int ucIndex = 0; ucIndex < len; ucIndex++) { printf("x ", app.v_ptr[ucIndex]&0xFF); } printf("\n"); if (!str_in || !key || !out) return 0; /* //加密的初始化向量 unsigned char iv[AES_BLOCK_SIZE]; //16位密码 char tmpIV[] = "0123456789abcdef"; for (int i = 0; i < 16; ++i) iv[i] = tmpIV[i]; */ AES_KEY aes; if (AES_set_encrypt_key((unsigned char*)szKey, 128, &aes) < 0) { return 0; } //分段加密 for (int i=0;i<len;i++){ if(i==0){ //AES_cbc_encrypt((unsigned char*)str_in, (unsigned char*)out, len, &aes, iv, AES_ENCRYPT); AES_ecb_encrypt((unsigned char*)app.v_ptr+i, (unsigned char*)out+i,&aes, AES_ENCRYPT); } } for (int ucIndex = 0; ucIndex < len; ucIndex++) { printf("x ", out[ucIndex]&0xFF); } printf("\n"); return len;

}

/********************************************************** 函数名：aes_decrypt 参数：const char* str_in --输入 参数：unsigned char* key --key 参数：unsigned char* out --输出 返回值：int 　　　　　 --0失败 1成功 说明：　　　　　　　　　　　　　　　 --解密 ********************************************************/ int aes_decrypt(char str_in,int inLen, char key, char out) { char szKey[128];memset(szKey,0x0,sizeof(szKey)); sha1prng_key(key,szKey);

if (!str_in || !key || !out) return 0; /* unsigned char iv[AES_BLOCK_SIZE];//加密的初始化向量 char tmpIV[] = "0123456789abcdef"; for (int i = 0; i < 16; ++i) iv[i] = tmpIV[i]; */ AES_KEY aes; if (AES_set_decrypt_key((unsigned char*)szKey, 128, &aes) < 0) { return 0; } for (int ucIndex = 0; ucIndex < 16; ucIndex++) { printf("x ", aes.rd_key[ucIndex]&0xFF); } printf("\n"); int len = inLen; //分段解密 for(int i=0;i<len;i++){ if(i==0){ //AES_cbc_encrypt((unsigned char*)str_in, (unsigned char*)out, len, &aes, iv, AES_DECRYPT); AES_ecb_encrypt((unsigned char*)str_in+i, (unsigned char*)out+i, &aes,AES_DECRYPT); } } for (int ucIndex = 0; ucIndex < len; ucIndex++) { printf("x ", out[ucIndex]&0xFF); } printf("\n"); int ioLen=unpadding(out,inLen,out); return ioLen;

}