public byte[] SignWithSHA1(byte[] data)
{
byte[] hash = new SHA1CryptoServiceProvider().ComputeHash(data);
byte[] buf = new byte[hash.Length + PKIUtil.SHA1_ASN_ID.Length];
Array.Copy(PKIUtil.SHA1_ASN_ID, 0, buf, 0, PKIUtil.SHA1_ASN_ID.Length);
Array.Copy(hash, 0, buf, PKIUtil.SHA1_ASN_ID.Length, hash.Length);
BigInteger x = new BigInteger(buf);
//Debug.WriteLine(x.ToHexString());
int padLen = (_publickey._n.bitCount() + 7) / 8;
x = RSAUtil.PKCS1PadType1(x, padLen);
byte[] result = Sign(x.getBytes());
return(result);
}
public void VerifyWithSHA1(byte[] data, byte[] expected)
{
BigInteger result = VerifyBI(data);
byte[] finaldata = RSAUtil.StripPKCS1Pad(result, 1).getBytes();
if (finaldata.Length != PKIUtil.SHA1_ASN_ID.Length + expected.Length)
{
throw new VerifyException("result is too short");
}
else
{
byte[] r = new byte[finaldata.Length];
Array.Copy(PKIUtil.SHA1_ASN_ID, 0, r, 0, PKIUtil.SHA1_ASN_ID.Length);
Array.Copy(expected, 0, r, PKIUtil.SHA1_ASN_ID.Length, expected.Length);
if (SSHUtil.memcmp(r, finaldata) != 0)
{
throw new VerifyException("failed to verify");
}
}
}
