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rsa - 在 Windows 中使用 CryptoAPI Next Generation (CNG) 进行 RSA 加密/解密的错误？

转载 作者：行者123 更新时间：2023-12-01 06:45:11 40 4
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我已经编写了一个代码来使用之前使用 CNG 生成的硬编码 RSA key 对来加密和解密数据。这是一个简单的程序，它简单地生成一些随机输入数据，使用公钥对其进行加密，然后使用私钥对生成的加密缓冲区进行解密。我打印了所有的输入、中间和输出阶段，以比较解密后的明文与原始输入明文是否相同，并将整个加密-解密重复 10 次。

但是，我观察到，在某些情况下，加密和解密都很好，但在其他情况下，解密后的明文与输入的明文根本不匹配。此类错误案例完全是随机和任意的，并且这些错误似乎没有任何模式。

这是 CNG 的 RSA 实现中的错误还是我做错了什么？

代码如下:

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <bcrypt.h>

#define NT_SUCCESS(Status)          (((NTSTATUS)(Status)) >= 0)
#define STATUS_UNSUCCESSFUL         ((NTSTATUS)0xC0000001L)

#define PrivateKeySize 283
#define PublicKeySize 155
#define InputDataSize 128

PUCHAR encryptedBuffer;
ULONG encryptedBufferSize = 128;


VOID printMem(PVOID Mem, int length)
{
    int i;
    for (i = 0; i < length; i++)
        printf("%02x ", ((unsigned char *)Mem)[i]);
}

VOID Decrypt()
{
    unsigned char PrivateKey[PrivateKeySize] = {0x52, 0x53, 0x41, 0x32, 0x00, 0x04, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x40, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0xB7, 0x50, 0x52, 0xDD, 0x58, 0xE4, 0x96, 0xAF, 0x91, 0xE5, 0xB2, 0x7B, 0x0A, 0xE6, 0xAA, 0x1F, 0x71, 0x8A, 0x66, 0xC3, 0xF0, 0x21, 0xD8, 0xE6, 0x2C, 0xD6, 0x25, 0x2E, 0x77, 0x3C, 0x61, 0x08, 0x1B, 0x69, 0xE7, 0x58, 0xDF, 0x3B, 0x07, 0xFE, 0xF1, 0xDB, 0xBF, 0xA6, 0x35, 0xDF, 0xC7, 0x49, 0x06, 0xC8, 0xDB, 0x74, 0x2A, 0xB9, 0xED, 0xB3, 0x04, 0x80, 0x75, 0x5F, 0x71, 0x2C, 0xD0, 0x14, 0x0E, 0x81, 0x18, 0x00, 0x5E, 0x34, 0x5A, 0xC2, 0x3A, 0x84, 0x63, 0xB1, 0x6B, 0x04, 0x21, 0x49, 0x7F, 0xE0, 0xF3, 0x52, 0x5E, 0x61, 0x43, 0xB1, 0x8F, 0x7C, 0xF2, 0x74, 0x29, 0x28, 0x69, 0x20, 0x36, 0xC0, 0x92, 0x17, 0x42, 0x99, 0x72, 0xE5, 0xE7, 0x82, 0xBE, 0x8E, 0x3B, 0x3F, 0xC9, 0x0A, 0xE1, 0xC4, 0x63, 0x68, 0x73, 0x1D, 0x67, 0x8D, 0xC0, 0xA3, 0xB4, 0xBA, 0xF0, 0xB7, 0xB0, 0x9B, 0xBB, 0x3F, 0xB8, 0x6E, 0xC0, 0x34, 0x1E, 0xA0, 0x01, 0x4B, 0x6D, 0x47, 0x73, 0x3F, 0xA5, 0x39, 0x05, 0x27, 0xD4, 0xD1, 0x38, 0x34, 0x32, 0x2C, 0x5B, 0x03, 0x5F, 0x16, 0x21, 0x64, 0x04, 0xD5, 0x19, 0xDB, 0xE7, 0x80, 0xDA, 0xBD, 0xC4, 0x1E, 0xAB, 0x61, 0xC8, 0x84, 0xDF, 0x54, 0x16, 0x77, 0x98, 0x9B, 0x90, 0x03, 0x83, 0xC4, 0x8D, 0x25, 0xB1, 0x32, 0x67, 0x77, 0x6A, 0x1C, 0x64, 0x2D, 0xFA, 0x9E, 0xB9, 0x26, 0xB5, 0xF8, 0x47, 0x4A, 0x9C, 0x35, 0x89, 0x5F, 0x12, 0x0E, 0xFF, 0x60, 0x87, 0x1E, 0x27, 0xC1, 0xC5, 0x7C, 0x77, 0x0A, 0xAE, 0x11, 0x37, 0xE3, 0x42, 0x9B, 0xAF, 0x9D, 0xBC, 0xC2, 0x52, 0xF8, 0x85, 0xBA, 0xED, 0x8E, 0xC3, 0x73, 0x04, 0x0A, 0x53, 0xD2, 0x1D, 0xEF, 0xA0, 0x6A, 0xCD, 0xBE, 0x93, 0x49, 0x34, 0x3A, 0xBD, 0xDF, 0x6A, 0x33, 0x25, 0x91, 0xFC, 0xE7};
    BCRYPT_ALG_HANDLE hAlgorithm = NULL;
    BCRYPT_KEY_HANDLE hKey = NULL;
    ULONG plaintextSize = 128;
    PUCHAR decryptedBuffer;
    ULONG decryptedBufferSize;
    NTSTATUS status;

    status = BCryptOpenAlgorithmProvider(&hAlgorithm,
                                            BCRYPT_RSA_ALGORITHM,
                                            NULL,
                                            0);
    if (!NT_SUCCESS(status)) {
        printf("Failed to get algorithm provider..status : %08x\n",status);
        goto cleanup;
    }

    status = BCryptImportKeyPair( hAlgorithm,
                                  NULL,
                                  BCRYPT_RSAPRIVATE_BLOB,
                                  &hKey,
                                  PrivateKey,
                                  PrivateKeySize,
                                  BCRYPT_NO_KEY_VALIDATION);
    if (!NT_SUCCESS(status)) {
        printf("Failed to import Private key..status : %08x\n",status);
        goto cleanup;
    }

    status = BCryptDecrypt( hKey,
                            encryptedBuffer,
                            encryptedBufferSize,
                            NULL,
                            NULL,
                            0,
                            NULL,
                            0,
                            &decryptedBufferSize,
                            0);
    if (!NT_SUCCESS(status)) {
        printf("Failed to get required size of buffer..status : %08x\n", status);
        goto cleanup;
    }

    decryptedBuffer = (PUCHAR)HeapAlloc (GetProcessHeap (), 0, decryptedBufferSize);
    if (decryptedBuffer == NULL) {
        printf("failed to allocate memory for buffer\n");
        goto cleanup;
    }

    status = BCryptDecrypt( hKey,
                            encryptedBuffer,
                            encryptedBufferSize,
                            NULL,
                            NULL,
                            0,
                            decryptedBuffer,
                            decryptedBufferSize,
                            &decryptedBufferSize,
                            0);
    if (!NT_SUCCESS(status)) {
        printf("Failed decrypt buffer..status : %08x\n",status);
        goto cleanup;
    }

    printf("Decrypted buffer\n");
    printMem(decryptedBuffer, decryptedBufferSize);
    printf("\n\n");

cleanup:
    HeapFree(GetProcessHeap(), 0, decryptedBuffer);

    BCryptDestroyKey(hKey);

    BCryptCloseAlgorithmProvider(hAlgorithm, 0);
}


VOID Encrypt()
{
    unsigned char PublicKey[PublicKeySize] = {0x52, 0x53, 0x41, 0x31, 0x00, 0x04, 0x00, 0x00, 0x03, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  0x00, 0x00, 0x00, 0x00,  0x01, 0x00, 0x01, 0xB7,  0x50, 0x52, 0xDD, 0x58, 0xE4, 0x96, 0xAF, 0x91,  0xE5, 0xB2, 0x7B, 0x0A,  0xE6, 0xAA, 0x1F, 0x71,  0x8A, 0x66, 0xC3, 0xF0, 0x21, 0xD8, 0xE6, 0x2C,  0xD6, 0x25, 0x2E, 0x77,  0x3C, 0x61, 0x08, 0x1B,  0x69, 0xE7, 0x58, 0xDF, 0x3B, 0x07, 0xFE, 0xF1,  0xDB, 0xBF, 0xA6, 0x35,  0xDF, 0xC7, 0x49, 0x06,  0xC8, 0xDB, 0x74, 0x2A, 0xB9, 0xED, 0xB3, 0x04,  0x80, 0x75, 0x5F, 0x71,  0x2C, 0xD0, 0x14, 0x0E,  0x81, 0x18, 0x00, 0x5E, 0x34, 0x5A, 0xC2, 0x3A,  0x84, 0x63, 0xB1, 0x6B,  0x04, 0x21, 0x49, 0x7F,  0xE0, 0xF3, 0x52, 0x5E, 0x61, 0x43, 0xB1, 0x8F,  0x7C, 0xF2, 0x74, 0x29,  0x28, 0x69, 0x20, 0x36,  0xC0, 0x92, 0x17, 0x42, 0x99, 0x72, 0xE5, 0xE7,  0x82, 0xBE, 0x8E, 0x3B,  0x3F, 0xC9, 0x0A, 0xE1,  0xC4, 0x63, 0x68, 0x73, 0x1D, 0x67, 0x8D, 0xC0,  0xA3, 0xB4, 0xBA, 0xF0,  0xB7, 0xB0, 0x9B};
    unsigned char InputData[InputDataSize];
    BCRYPT_ALG_HANDLE hAlgorithm = NULL;
    BCRYPT_KEY_HANDLE hKey = NULL;
    NTSTATUS status;

    for (int i=0; i<128; i++)
        InputData[i] = (unsigned char)rand();

    printf("Random Data is \n");
    printMem(InputData, InputDataSize);
    printf("\n\n");

    status = BCryptOpenAlgorithmProvider(    &hAlgorithm,
                                            BCRYPT_RSA_ALGORITHM,
                                            NULL,
                                            0 );
    if (!NT_SUCCESS(status)) {
        printf("Failed to get algorithm provider..status : %08x\n",status);
        goto cleanup;
    }

    status = BCryptImportKeyPair( hAlgorithm,
                                  NULL,
                                  BCRYPT_RSAPUBLIC_BLOB,
                                  &hKey,
                                  PublicKey,
                                  155,
                                  BCRYPT_NO_KEY_VALIDATION );
    if (!NT_SUCCESS(status)) {
        printf("Failed to import Private key..status : %08x\n",status);
        goto cleanup;

    }

    status = BCryptEncrypt( hKey,
                            InputData,
                            InputDataSize,
                            NULL,
                            NULL,
                            0,
                            NULL,
                            0,
                            &encryptedBufferSize,
                            0
                            );
    if (!NT_SUCCESS(status)) {
        printf("Failed to get required size of buffer..status : %08x\n",status);
        goto cleanup;
    }

    encryptedBuffer = (PUCHAR)HeapAlloc (GetProcessHeap (), 0, encryptedBufferSize);

    if (encryptedBuffer == NULL) {
        printf("failed to allocate memory for blindedFEKBuffer\n");
        goto cleanup;
    }

    status = BCryptEncrypt( hKey,
                            InputData,
                            InputDataSize,
                            NULL,
                            NULL,
                            0,
                            encryptedBuffer,
                            encryptedBufferSize,
                            &encryptedBufferSize,
                            0
                            );

    if (!NT_SUCCESS(status))    {
        printf("Failed encrypt data..status : %08x\n",status);
        goto cleanup;
    }

printf("Encrypted Data\n");
printMem(encryptedBuffer, encryptedBufferSize);
printf("\n\n");

cleanup:
            if(hKey)
                BCryptDestroyKey(hKey);
            if(hAlgorithm)
                BCryptCloseAlgorithmProvider(hAlgorithm, 0);
}


int __cdecl wmain(
                   int argc,
                   __in_ecount(argc) LPWSTR *wargv)
{

    int i;
    for (i=0; i<10; i++)
    {
        Encrypt();
        Decrypt();
    }

}

最佳答案

这不是 CNG 中的错误，而是原始 RSA 加密工作方式的产物。您正在加密的一些随机值大于 key 的模数(模数是 RSA key 中 2 个素数相乘的值)，这意味着值环绕(如果您设置 InputData[0] = 0 你将看到输入和输出始终匹配)。

您还想通过 BCRYPT_PAD_PKCS1或 BCRYPT_PAD_OAEP到 BCryptEncrypt 的 dwFlags 参数/BCryptDecrypt因为原始 RSA 加密不安全。如果您使用 BCRYPT_PAD_OAEP您还必须提供 BCRYPT_OAEP_PADDING_INFO structure .

关于rsa - 在 Windows 中使用 CryptoAPI Next Generation (CNG) 进行 RSA 加密/解密的错误？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/6316158/

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