我有两个应用程序,一个用于计算文档的SHA-256哈希值,另一个用于进行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
会产生与制作文档本身的CKM_SHA256_RSA_PKCS
不同的结果。
所以我的问题是,这两个实现有什么区别?
什么信息被添加到CKM_SHA256_RSA_PKCS
机制中的哈希中,该机制会产生完全不同的签名?
答案 0 :(得分:2)
Mechanims CKM_SHA256_RSA_PKCS
做了以下事情:
CKM_SHA256
一样DigestInfo
结构
DigestInfo
结构,就像CKM_RSA_PKCS
一样当涉及构建DER编码的DigestInfo
结构时,有几种方法可能:
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();
}
/// <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;
}