public static byte[] Create(string message, HashAlgorithms hashAlgorithm, X509Certificate2 certificate)
{
RSACryptoServiceProvider csp = (RSACryptoServiceProvider)certificate.PrivateKey;
if (csp == null)
{
throw new Exception("Valid certificate was not found");
}
UnicodeEncoding encoding = new UnicodeEncoding();
byte[] data = encoding.GetBytes(message); //current message encripted in bytes
byte[] hash = null; //hash result
if (hashAlgorithm.Equals(HashAlgorithms.SHA1))
{
SHA1Managed sha1 = new SHA1Managed();
hash = sha1.ComputeHash(data);
}
else if (hashAlgorithm.Equals(HashAlgorithms.SHA256))
{
SHA256Managed sha256 = new SHA256Managed();
hash = sha256.ComputeHash(data);
}
return(csp.SignHash(hash, CryptoConfig.MapNameToOID(hashAlgorithm.ToString())));
}
public static bool Verify(string message, HashAlgorithms hashAlgorithm, byte[] signature, X509Certificate2 certificate)
{
RSACryptoServiceProvider csp = (RSACryptoServiceProvider)certificate.PublicKey.Key;
UnicodeEncoding encoding = new UnicodeEncoding();
byte[] data = encoding.GetBytes(message);
byte[] hash = null;
if (hashAlgorithm.Equals(HashAlgorithms.SHA1))
{
SHA1Managed sha1 = new SHA1Managed();
hash = sha1.ComputeHash(data);
}
else if (hashAlgorithm.Equals(HashAlgorithms.SHA256))
{
SHA256Managed sha256 = new SHA256Managed();
hash = sha256.ComputeHash(data);
}
return(csp.VerifyHash(hash, CryptoConfig.MapNameToOID(hashAlgorithm.ToString()), signature));
}
