使用CryptoAPI创建HMAC的步骤如下：http://msdn.microsoft.com/en-us/library/Aa379863
计算HMAC
- 通过调用CryptAcquireContext获取指向Microsoft Cryptographic Service Provider (CSP)的指针。
- 通过调用CryptCreateHash创建一个HMAC哈希对象句柄。在Algid参数中传递CALG_HMAC。在hKey参数中传递对称密钥的句柄。该对称密钥用于计算HMAC。
- 通过调用CryptSetHashParam指定要使用的哈希类型，并将dwParam参数设置为HP_HMAC_INFO的值。pbData参数必须指向已初始化的HMAC_INFO结构。
- 调用CryptHashData开始计算数据的HMAC。第一次调用CryptHashData会使用XOR运算符将密钥值与内部字符串和数据组合。 XOR操作的结果进行哈希，然后哈希目标数据以计算HMAC（由传递给CryptHashData调用的pbData参数指向）。如果需要，可以随后调用CryptHashData以完成目标数据的哈希。
- 调用CryptGetHashParam并将dwParam参数设置为HP_HASHVAL。此调用导致内部哈希完成并使用XOR与密钥组合。 XOR操作的结果进行哈希，然后哈希内部哈希的结果（在上一步中完成）。然后完成外部哈希，并将结果返回到pbData参数中，长度在dwDataLen参数中。
我无论如何都无法使其正常工作。我已按顺序执行了所有步骤，但仍无法运行程序。运行时出现错误：
Error in CryptImportKey 0x8009007
Error in CryptCreatHash 0x8009003
Error in CryptSetHashParam 0x00000057
Error in CryptHashData 0x00000057
Error in CryptGetHashParam 0x00000057
Can anyone help?
#include <iostream>
#include <windows.h>
#include <wincrypt.h>
using namespace std;
#define CALG_HMAC CALG_SHA1
int main()
{
//--------------------------------------------------------------------
// Declare variables.
HCRYPTPROV hProv = NULL;
HCRYPTHASH hHash = NULL;
HCRYPTKEY hKey = NULL;
BYTE DesKeyBlob[] = { 0x70,0x61,0x73,0x73,0x77,0x6F,0x72,0x64 };
HCRYPTHASH hHmacHash = NULL;
PBYTE pbHash = NULL;
DWORD dwDataLen = 20;
BYTE Data[] = {0x6D,0x65,0x73,0x73,0x61,0x67,0x65};
HMAC_INFO HmacInfo;
//--------------------------------------------------------------------
// Zero the HMAC_INFO structure
ZeroMemory(&HmacInfo, sizeof(HmacInfo));
HmacInfo.HashAlgid = CALG_HMAC;
HmacInfo.pbInnerString = (BYTE*)0x36;
HmacInfo.cbInnerString = 0;
HmacInfo.pbOuterString = (BYTE*)0x5C;
HmacInfo.cbOuterString = 0;
// Step 1
if (!CryptAcquireContext(
&hProv, // handle of the CSP
NULL, // key container name
NULL, // CSP name
PROV_RSA_FULL, // provider type
CRYPT_VERIFYCONTEXT)) // no key access is requested
{
printf(" Error in AcquireContext 0x%08x \n",
GetLastError());
}
//--------------------------------------------------------------------
//Step 2
//in step two, we need the hash key used to be imported?
//imports the key used... as hKey1
if(!CryptImportKey(
hProv,
DesKeyBlob,
sizeof(DesKeyBlob),
0,
CRYPT_EXPORTABLE,
&hKey ))
{
printf("Error in !CryptImportKey 0x%08x \n",
GetLastError());
}
if (!CryptCreateHash(
hProv, // handle of the CSP
CALG_HMAC, // hash algorithm to use
hKey, // hash key this shoudl point to a key used to compute the HMAC?
0, // reserved
&hHmacHash // address of hash object handle
)){
printf("Error in CryptCreateHash 0x%08x \n",
GetLastError());
}
// Step 3
if (!CryptSetHashParam(
hHmacHash,//hProv,//hHash,//hHmacHash, // handle of the HMAC hash object
HP_HMAC_INFO, // setting an HMAC_INFO object
(BYTE*)&HmacInfo, // the HMAC_INFO object
0)) // reserved
{
printf("Error in CryptSetHashParam 0x%08x \n",
GetLastError());
}
//Step 4
if (!CryptHashData(
hHmacHash, // handle of the HMAC hash object
Data, // message to hash
sizeof(Data), // number of bytes of data to add
0)) // flags
{
printf("Error in CryptHashData 0x%08x \n",
GetLastError());
}
//Step 5
if (!CryptGetHashParam(
hHmacHash, // handle of the HMAC hash object
HP_HASHVAL, // query on the hash value
pbHash, // pointer to the HMAC hash value
&dwDataLen, // length, in bytes, of the hash
0))
{
printf("Error in CryptGetHashParam 0x%08x \n", GetLastError());
}
// Print the hash to the console.
printf("The hash is: ");
for(DWORD i = 0 ; i < dwDataLen ; i++)
{
printf("%2.2x ",pbHash[i]);
}
printf("\n");
int a;
std::cin >> a;
return 0;
}