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我有两个应用程序,一个计算文档的 SHA-256 哈希值,另一个进行 RSA 签名。尝试不同的事情我得出的结论是,制作CKM_SHA256然后制作CKM_RSA_PKCS会产生不同的结果,而不仅仅是制作CKM_SHA256_RSA_PKCS文档本身。

所以我的问题是,这两种实现有什么区别?什么信息被添加到CKM_SHA256_RSA_PKCS机制中的散列中,从而产生完全不同的签名?

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1 回答 1

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MechanimsCKM_SHA256_RSA_PKCS做了以下事情:

  1. CKM_SHA256像一样计算数据的 SHA256 哈希值
  2. 构造RFC 8017中定义的DER 编码DigestInfo结构
  3. DigestInfo用私钥签名结构就像这样CKM_RSA_PKCS

在构建 DER 编码结构时,有几种方法是可能的DigestInfo

  1. Pkcs11Admin应用程序中,我确实使用了 BouncyCastle库:
public static byte[] CreateDigestInfo(byte[] hash, string hashOid)
{
    DerObjectIdentifier derObjectIdentifier = new DerObjectIdentifier(hashOid);
    AlgorithmIdentifier algorithmIdentifier = new AlgorithmIdentifier(derObjectIdentifier, null);
    DigestInfo digestInfo = new DigestInfo(algorithmIdentifier, hash);
    return digestInfo.GetDerEncoded();
}
  1. Pkcs11Interop.X509Store库中,我确实使用了预计算数组:
/// <summary>
/// Creates DER encoded PKCS#1 DigestInfo structure defined in RFC 8017
/// </summary>
/// <param name="hash">Hash value</param>
/// <param name="hashAlgorithm">Hash algorithm</param>
/// <returns>DER encoded PKCS#1 DigestInfo structure or null</returns>
private static byte[] CreatePkcs1DigestInfo(byte[] hash, HashAlgorithmName hashAlgorithm)
{
    if (hash == null || hash.Length == 0)
        throw new ArgumentNullException(nameof(hash));

    byte[] pkcs1DigestInfo = null;

    if (hashAlgorithm == HashAlgorithmName.MD5)
    {
        if (hash.Length != 16)
            throw new ArgumentException("Invalid lenght of hash value");

        pkcs1DigestInfo = new byte[] { 0x30, 0x20, 0x30, 0x0C, 0x06, 0x08, 0x2A, 0x86, 0x48, 0x86, 0xF7, 0x0D, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
    }
    else if (hashAlgorithm == HashAlgorithmName.SHA1)
    {
        if (hash.Length != 20)
            throw new ArgumentException("Invalid lenght of hash value");

        pkcs1DigestInfo = new byte[] { 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2B, 0x0E, 0x03, 0x02, 0x1A, 0x05, 0x00, 0x04, 0x14, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
    }
    else if (hashAlgorithm == HashAlgorithmName.SHA256)
    {
        if (hash.Length != 32)
            throw new ArgumentException("Invalid lenght of hash value");

        pkcs1DigestInfo = new byte[] { 0x30, 0x31, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20, 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 };
        Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
    }
    else if (hashAlgorithm == HashAlgorithmName.SHA384)
    {
        if (hash.Length != 48)
            throw new ArgumentException("Invalid lenght of hash value");

        pkcs1DigestInfo = new byte[] { 0x30, 0x41, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30, 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, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
    }
    else if (hashAlgorithm == HashAlgorithmName.SHA512)
    {
        if (hash.Length != 64)
            throw new ArgumentException("Invalid lenght of hash value");

        pkcs1DigestInfo = new byte[] { 0x30, 0x51, 0x30, 0x0D, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40, 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, 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 };
        Array.Copy(hash, 0, pkcs1DigestInfo, pkcs1DigestInfo.Length - hash.Length, hash.Length);
    }

    return pkcs1DigestInfo;
}
于 2018-05-11T21:17:01.667 回答