使用openssl解密c#的DESCryptoServiceProvider的密文_descryptoserviceprovider openssl cbc-优快云博客

本文链接：https://blog.youkuaiyun.com/dragoo1/article/details/22586281

本文介绍如何使用C#进行DES加密，并通过C++与OpenSSL库实现相同的加密效果及解密过程。文章展示了具体的代码示例，包括C#中的CBC模式加密流程和C++中利用OpenSSL进行解密的方法。

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c#加密（dec,cbc)：

private void button1_Click(object sender, EventArgs e)
{
    string input = "d";
    byte[] key = new byte[] { 0x1d, 0x80, 0x6a, 0x0b, 0xc2, 0x04, 0xbf, 0x0d };   //密钥
    byte[] iv = new byte[] { 0xce, 0xa8, 0xd9, 0x61, 0x16, 0x7f, 0x6a, 0xa9 };    //初始化向量
    DES des_cbc = new DESCryptoServiceProvider();
    byte[] inbuff = ASCIIEncoding.ASCII.GetBytes(input);
    MemoryStream ms = new MemoryStream();
    CryptoStream cs = new CryptoStream(ms, des_cbc.CreateEncryptor(key, iv), CryptoStreamMode.Write);
    cs.Write(inbuff, 0, inbuff.Length);
    cs.Close();
    byte[] ciphertext = ms.ToArray();

    //the result: ciphertext={ 0x18, 0x12, 0xe0, 0x4e, 0x83, 0x31, 0x25, 0xec};
}

c++ openssl解密

#include <iostream>
using namespace std;

#include <openssl/evp.h>
#pragma comment(lib, "libeay32.lib")

int main()
{
    unsigned char key[8] = { 0x1d, 0x80, 0x6a, 0x0b, 0xc2, 0x04, 0xbf, 0x0d };    //密钥
    unsigned char iv[8] = { 0xce, 0xa8, 0xd9, 0x61, 0x16, 0x7f, 0x6a, 0xa9 };    //初始化向量

    unsigned char ciphertext[8]={ 0x18, 0x12, 0xe0, 0x4e, 0x83, 0x31, 0x25, 0xec};
    int input_length = 8;    //密文长度

    EVP_CIPHER_CTX de;
    EVP_CIPHER_CTX_init(&de);
    EVP_DecryptInit_ex(&de, EVP_des_cbc(), NULL, key, iv);
    EVP_CIPHER_CTX_set_padding(&de, 8);

    int plaintext_len = input_length+8;
    unsigned char* cbc_out = new unsigned char[plaintext_len];
    memset(cbc_out,0,plaintext_len);

    //output_length and output_length1 need to be different.
    int output_length1 = 0;
    int ret1 = EVP_DecryptUpdate(&de, cbc_out, &plaintext_len, ciphertext, input_length);
    if(!EVP_DecryptFinal_ex(&de, cbc_out+plaintext_len, &output_length1))
    {
        printf("ERROR in EVP_DecryptFinal_ex\n");
        return 1;
    }
    //the result:cbc_out={'d', 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x07, 0x00},output_length1=1
    delete[] cbc_out;
    EVP_CIPHER_CTX_cleanup(&de);
}

参考：http://blogs.inxsasia.com/hiran/2010/07/des-with-openssl-vs-descryptoserviceprovider-in-net.html

http://stackoverflow.com/questions/5727646/what-is-the-length-parameter-of-aes-evp-decrypt

安装开源openssl:http://blog.youkuaiyun.com/dragoo1/article/details/22398473

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下面内容只是参考：

1.c++ openssl 实现c#加密相同结果

#include <iostream>
using namespace std;

#include <openssl/evp.h>
#pragma comment(lib, "libeay32.lib")

int main()
{
	unsigned char key[8] = { 29, 128, 106, 11, 194, 4, 191, 13 };
	unsigned char iv[8] = { 206, 168, 217, 97, 22, 127, 106, 169};
	
	static unsigned char cbc_data[40]={
		'd',0x00,0x00,0x00,0x00,0x00,0x00,0x00,
			0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
			0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
			0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
			0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
	};

	unsigned char cbc_out[40];
	memset(cbc_out,0,40);

	EVP_CIPHER_CTX ctx;
	EVP_CIPHER_CTX_init(&ctx);
	EVP_EncryptInit_ex(&ctx, EVP_des_cbc(), NULL, key, iv);

	EVP_CIPHER_CTX_set_padding(&ctx, 8);
	//output_length and output_length1 need to be different.
	int output_length = sizeof(cbc_data);
	int input_length = 1;
	int output_length1 = 0;
	EVP_EncryptUpdate(&ctx, cbc_out, &output_length, cbc_data, input_length);
	EVP_EncryptFinal_ex(&ctx, cbc_out+output_length, &output_length1);
	output_length += output_length1;
}

2.vc++解密：

#include <stdio.h>
#include <windows.h>
#include <wincrypt.h>

typedef struct
{
	BLOBHEADER header;
	DWORD cbKeySize;
	BYTE rgbKeyData[8];
}KeyBlob;

int main(int argc, char* argv[])
{
	unsigned char key[8] = { 0x1d, 0x80, 0x6a, 0x0b, 0xc2, 0x04, 0xbf, 0x0d };    //密钥
	unsigned char iv[8] = { 0xce, 0xa8, 0xd9, 0x61, 0x16, 0x7f, 0x6a, 0xa9 };    //初始化向量

	unsigned char ciphertext[8]={ 0x18, 0x12, 0xe0, 0x4e, 0x83, 0x31, 0x25, 0xec};
	DWORD length = 8;    //密文长度

	// init
	HCRYPTPROV hProv = NULL;
	HCRYPTKEY hSessionKey = NULL;
	DWORD dwDataLen = 0;

	KeyBlob blob;
	blob.header.bType = PLAINTEXTKEYBLOB;
	blob.header.bVersion = CUR_BLOB_VERSION;
	blob.header.reserved = 0;
	blob.header.aiKeyAlg = CALG_DES;
	blob.cbKeySize = 8;
	memcpy(blob.rgbKeyData, key, 8);

	BYTE IV[9] = {0};
	memcpy( IV, iv, 8 );

	// start
	CryptAcquireContext(&hProv,NULL, MS_DEF_PROV, PROV_RSA_FULL,0); 
	CryptImportKey(hProv, (BYTE*)&blob, sizeof(blob), 0, 0, &hSessionKey);
	CryptSetKeyParam(hSessionKey, KP_IV, (BYTE*)IV, 0);

	// Do
	BOOL ret = CryptDecrypt(hSessionKey,NULL,TRUE,0,(BYTE*)ciphertext,&length);

	CryptDestroyKey(hSessionKey);
	CryptReleaseContext(hProv, 0);

	return 0;
}

参考：http://bbs.youkuaiyun.com/topics/390566435