因此，我正在考虑使用哪个加密 C++ 库（我已经想出了如何在 C# 中进行等效操作）来验证许可证文件签名哈希。
阅读有关 CNG 的 Microsoft 文档，似乎不可能从字节流中生成代码中的 ECDSA 密钥，尽管这对于 RSA 密钥是可能的（我认为，不是 100% 肯定）。
因为我想要生成代码字节流，所以我查看了 crypto++，我设法编译了测试套件，但是 cryptolib.lib 是一个超大的 90 兆字节，我正面临着一系列链接错误，只是试图做一些基本的事情。所以我现在不太热衷于加密++。
所以我想转而使用微软在其桌面 Windows 操作系统中提供的东西，但我又回到了我最初的问题，即没有代码字节流生成的密钥。
专家能否证实这真的不可能？此外，他们能否提出替代方案，我很高兴使用长（2048？）密钥回退到 RSA。
以下代码为我编译并运行。可以在MSDN 文章 - 使用 CNG 签名数据中找到它。我想知道它是否可以改编。此代码是否 (a) 即时创建 ECDSA 密钥 (b) 签署哈希 (c) 将密钥保存到证书存储 (d) 检索密钥并验证签名哈希。如果是这样，那么我猜它是演示代码。我需要的是一个硬编码 ECDSA 密钥的示例，而不是动态创建的。
// CngECDSA.cpp : Defines the entry point for the console application.
// Based on https://msdn.microsoft.com/en-us/library/windows/desktop/aa376304(v=vs.85).aspx
#include "stdafx.h"
#include <Windows.h>
#include <stdint.h>
#include <Bcrypt.h>
#include <ncrypt.h>
#pragma comment(lib, "bcrypt")
#pragma comment(lib, "ncrypt")
#define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0)
#define STATUS_UNSUCCESSFUL ((NTSTATUS)0xC0000001L)
static const BYTE rgbMsg[] =
{
0x04, 0x87, 0xec, 0x66, 0xa8, 0xbf, 0x17, 0xa6,
0xe3, 0x62, 0x6f, 0x1a, 0x55, 0xe2, 0xaf, 0x5e,
0xbc, 0x54, 0xa4, 0xdc, 0x68, 0x19, 0x3e, 0x94,
};
BYTE value[] =
{ 0x02,0x00,0x00,0x00 };
void __cdecl wmain(
int argc,
__in_ecount(argc) LPWSTR *wargv)
{
NCRYPT_PROV_HANDLE hProv = NULL;
NCRYPT_KEY_HANDLE hKey = NULL;
BCRYPT_KEY_HANDLE hTmpKey = NULL;
SECURITY_STATUS secStatus = ERROR_SUCCESS;
BCRYPT_ALG_HANDLE hHashAlg = NULL,
hSignAlg = NULL;
BCRYPT_HASH_HANDLE hHash = NULL;
NTSTATUS status = STATUS_UNSUCCESSFUL;
DWORD cbData = 0,
cbHash = 0,
cbBlob = 0,
cbSignature = 0,
cbHashObject = 0;
PBYTE pbHashObject = NULL;
PBYTE pbHash = NULL,
pbBlob = NULL,
pbSignature = NULL;
UNREFERENCED_PARAMETER(argc);
UNREFERENCED_PARAMETER(wargv);
//open an algorithm handle
if (!NT_SUCCESS(status = BCryptOpenAlgorithmProvider(
&hHashAlg,
BCRYPT_SHA1_ALGORITHM,
NULL,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptOpenAlgorithmProvider\n", status);
goto Cleanup;
}
if (!NT_SUCCESS(status = BCryptOpenAlgorithmProvider(
&hSignAlg,
BCRYPT_ECDSA_P256_ALGORITHM,
NULL,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptOpenAlgorithmProvider\n", status);
goto Cleanup;
}
//calculate the size of the buffer to hold the hash object
if (!NT_SUCCESS(status = BCryptGetProperty(
hHashAlg,
BCRYPT_OBJECT_LENGTH,
(PBYTE)&cbHashObject,
sizeof(DWORD),
&cbData,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptGetProperty\n", status);
goto Cleanup;
}
//allocate the hash object on the heap
pbHashObject = (PBYTE)HeapAlloc(GetProcessHeap(), 0, cbHashObject);
if (NULL == pbHashObject)
{
wprintf(L"**** memory allocation failed\n");
goto Cleanup;
}
//calculate the length of the hash
if (!NT_SUCCESS(status = BCryptGetProperty(
hHashAlg,
BCRYPT_HASH_LENGTH,
(PBYTE)&cbHash,
sizeof(DWORD),
&cbData,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptGetProperty\n", status);
goto Cleanup;
}
//allocate the hash buffer on the heap
pbHash = (PBYTE)HeapAlloc(GetProcessHeap(), 0, cbHash);
if (NULL == pbHash)
{
wprintf(L"**** memory allocation failed\n");
goto Cleanup;
}
//create a hash
if (!NT_SUCCESS(status = BCryptCreateHash(
hHashAlg,
&hHash,
pbHashObject,
cbHashObject,
NULL,
0,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptCreateHash\n", status);
goto Cleanup;
}
//hash some data
if (!NT_SUCCESS(status = BCryptHashData(
hHash,
(PBYTE)rgbMsg,
sizeof(rgbMsg),
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptHashData\n", status);
goto Cleanup;
}
//close the hash
if (!NT_SUCCESS(status = BCryptFinishHash(
hHash,
pbHash,
cbHash,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptFinishHash\n", status);
goto Cleanup;
}
//open handle to KSP
if (FAILED(secStatus = NCryptOpenStorageProvider(
&hProv,
MS_KEY_STORAGE_PROVIDER,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptOpenStorageProvider\n", secStatus);
goto Cleanup;
}
//create a persisted key
if (FAILED(secStatus = NCryptCreatePersistedKey(
hProv,
&hKey,
NCRYPT_ECDSA_P256_ALGORITHM,
L"my ecc key",
0,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptCreatePersistedKey\n", secStatus);
goto Cleanup;
}
//create key on disk
if (FAILED(secStatus = NCryptFinalizeKey(hKey, 0)))
{
wprintf(L"**** Error 0x%x returned by NCryptFinalizeKey\n", secStatus);
goto Cleanup;
}
//sign the hash
if (FAILED(secStatus = NCryptSignHash(
hKey,
NULL,
pbHash,
cbHash,
NULL,
0,
&cbSignature,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptSignHash\n", secStatus);
goto Cleanup;
}
//allocate the signature buffer
pbSignature = (PBYTE)HeapAlloc(GetProcessHeap(), 0, cbSignature);
if (NULL == pbSignature)
{
wprintf(L"**** memory allocation failed\n");
goto Cleanup;
}
if (FAILED(secStatus = NCryptSignHash(
hKey,
NULL,
pbHash,
cbHash,
pbSignature,
cbSignature,
&cbSignature,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptSignHash\n", secStatus);
goto Cleanup;
}
if (FAILED(secStatus = NCryptExportKey(
hKey,
NULL,
BCRYPT_ECCPUBLIC_BLOB,
NULL,
NULL,
0,
&cbBlob,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptExportKey\n", secStatus);
goto Cleanup;
}
pbBlob = (PBYTE)HeapAlloc(GetProcessHeap(), 0, cbBlob);
if (NULL == pbBlob)
{
wprintf(L"**** memory allocation failed\n");
goto Cleanup;
}
if (FAILED(secStatus = NCryptExportKey(
hKey,
NULL,
BCRYPT_ECCPUBLIC_BLOB,
NULL,
pbBlob,
cbBlob,
&cbBlob,
0)))
{
wprintf(L"**** Error 0x%x returned by NCryptExportKey\n", secStatus);
goto Cleanup;
}
if (!NT_SUCCESS(status = BCryptImportKeyPair(
hSignAlg,
NULL,
BCRYPT_ECCPUBLIC_BLOB,
&hTmpKey,
pbBlob,
cbBlob,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptImportKeyPair\n", status);
goto Cleanup;
}
if (!NT_SUCCESS(status = BCryptVerifySignature(
hTmpKey,
NULL,
pbHash,
cbHash,
pbSignature,
cbSignature,
0)))
{
wprintf(L"**** Error 0x%x returned by BCryptVerifySignature\n", status);
goto Cleanup;
}
wprintf(L"Success!\n");
Cleanup:
if (hHashAlg)
{
BCryptCloseAlgorithmProvider(hHashAlg, 0);
}
if (hSignAlg)
{
BCryptCloseAlgorithmProvider(hSignAlg, 0);
}
if (hHash)
{
BCryptDestroyHash(hHash);
}
if (pbHashObject)
{
HeapFree(GetProcessHeap(), 0, pbHashObject);
}
if (pbHash)
{
HeapFree(GetProcessHeap(), 0, pbHash);
}
if (pbSignature)
{
HeapFree(GetProcessHeap(), 0, pbSignature);
}
if (pbBlob)
{
HeapFree(GetProcessHeap(), 0, pbBlob);
}
if (hTmpKey)
{
BCryptDestroyKey(hTmpKey);
}
if (hKey)
{
NCryptDeleteKey(hKey, 0);
}
if (hProv)
{
NCryptFreeObject(hProv);
}
}
为了清楚起见，我的目标是 384 位，为了与 OpenSsl 和 C# 兼容，曲线名称是 NIST 推荐的曲线secp384r1 – {1.3.132.0.34} ，我将使用两次 SHA256 哈希（就像比特币一样）。