如何导出Diffie-Hellman共享密钥？

问题描述

我使用以下方法导出DH公钥和随机私钥：



使用1024位MODP组2：



G为2，P为：

I use the following method to export DH public key and random private key:

Using 1024 bit of MODP Group 2:

The G is 2 andthe P is:

static	BYTE G_Prime[]={
		0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xC9,0x0F,0xDA,0xA2,0x21,0x68,0xC2,0x34,
		0xC4,0xC6,0x62,0x8B,0x80,0xDC,0x1C,0xD1,0x29,0x02,0x4E,0x08,0x8A,0x67,0xCC,0x74,
		0x02,0x0B,0xBE,0xA6,0x3B,0x13,0x9B,0x22,0x51,0x4A,0x08,0x79,0x8E,0x34,0x04,0xDD,
		0xEF,0x95,0x19,0xB3,0xCD,0x3A,0x43,0x1B,0x30,0x2B,0x0A,0x6D,0xF2,0x5F,0x14,0x37,
		0x4F,0xE1,0x35,0x6D,0x6D,0x51,0xC2,0x45,0xE4,0x85,0xB5,0x76,0x62,0x5E,0x7E,0xC6,
		0xF4,0x4C,0x42,0xE9,0xA6,0x37,0xED,0x6B,0x0B,0xFF,0x5C,0xB6,0xF4,0x06,0xB7,0xED,
		0xEE,0x38,0x6B,0xFB,0x5A,0x89,0x9F,0xA5,0xAE,0x9F,0x24,0x11,0x7C,0x4B,0x1F,0xE6,
		0x49,0x28,0x66,0x51,0xEC,0xE6,0x53,0x81,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,
	};

PublicKey生成的方法：

PublicKey generated method:

struct DH_Struct
{
    HCRYPTPROV hProv;
    HCRYPTKEY hKey;
    HCRYPTKEY hSessionKey;
    BYTE G[128];
    BYTE P[128];
    struct _PublicBlob
    {
        BLOBHEADER header;
        DHPUBKEY DhPubStruct;
        BYTE PublicKey[128];
    }PublicKey;

    struct _PrivateBlob
    {
        BLOBHEADER header;
        DHPUBKEY DhPubStruct;
        BYTE P[128];
        BYTE G[128];
        BYTE PrivateKey[128];
    }PrivateBlob;

    BYTE RemotePublickKey[128];
};

void GetDHPublic(DH_Struct& ret)
{
	HCRYPTPROV hProv;
	BOOL blRet= CryptAcquireContextW(&hProv,
        NULL,        MS_ENH_DSS_DH_PROV,
        PROV_DSS_DH,        CRYPT_VERIFYCONTEXT);

	int bitlength=128*8;
	//DHKEYSIZE << 16 
	HCRYPTKEY hCryptKey;
	blRet=CryptGenKey(hProv, CALG_DH_EPHEM,
		bitlength << 16 |
		CRYPT_EXPORTABLE |		CRYPT_PREGEN,
		&hCryptKey);

	DATA_BLOB P={128,ret.P};
    DATA_BLOB G={128,ret.G};

	blRet=CryptSetKeyParam(hCryptKey,KP_P,(BYTE*)&P,0);
	int _n1=GetLastError();

	blRet=CryptSetKeyParam(hCryptKey,KP_G,(BYTE*)&G,0);
	int _n=GetLastError();

	blRet=CryptSetKeyParam(hCryptKey,KP_X,NULL,0);

	DWORD dwPublicKey=0;	//value=144;
	blRet= CryptExportKey(
        hCryptKey,        NULL,
        PUBLICKEYBLOB,        0,        NULL,        &dwPublicKey);
	blRet= CryptExportKey(
        hCryptKey,        NULL,
        PUBLICKEYBLOB,        0,        (BYTE*)&ret.PublicKey,        &dwPublicKey);

	DWORD dwPrivateKey=0;	//value=400;
	blRet= CryptExportKey(
        hCryptKey,        NULL,
        PRIVATEKEYBLOB,        0,        NULL,        &dwPrivateKey);
	blRet= CryptExportKey(
        hCryptKey,        NULL,
        PRIVATEKEYBLOB,        0,         (BYTE*)&ret.PrivateBlob,        &dwPrivateKey);

}

假设remotePublicKey是另一个客户生成的公钥：

Assuming remotePublicKey the public key generated by another client:

BYTE remotePublicKey[128];

导入此remotePublicKey：

Importing this remotePublicKey:

void ImportKey(DH_Struct& ret)
{
	struct _MyStruct
	{
		PUBLICKEYSTRUC publicHeader;
		DHPUBKEY publicKey;
		byte data[128];
	};

	_MyStruct pkg;
	pkg.publicHeader.bType=PUBLICKEYBLOB;
	pkg.publicHeader.bVersion=0x02;
	pkg.publicHeader.reserved=0;
	pkg.publicHeader.aiKeyAlg=CALG_DH_EPHEM;

	pkg.publicKey.bitlen=1024;
	pkg.publicKey.magic=0x31484400;		//DH1

	memcpy(pkg.data,ret.RemotePublickKey,128);
	int importSize=sizeof(_MyStruct);


	HCRYPTKEY hSession;
	BOOL blRet=CryptImportKey(ret.hProv,
		(BYTE*)&pkg,importSize,
		ret.hKey,0,&hSession);

	ret.hSessionKey=hSession;
}

但是我想获得DH共享密钥，请帮助我，谢谢

But I want to get DH shared key , help me, thank you

推荐答案

这篇关于如何导出Diffie-Hellman共享密钥？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！