public byte[] Decrypt(Encrypted e)
{
if (e.KeyId != Id)
{
throw ExceptionFactory.MakeInvalidOperation("RSA key: mismatching key id");
}
if (e.Scheme != EncryptionScheme)
{
throw ExceptionFactory.MakeInvalidOperation(
string.Format("RSA key: invalid encryption scheme '{0}', expected '{1}'",
e.Scheme,
EncryptionScheme));
}
using (var rsa = new RSACryptoServiceProvider())
{
rsa.ImportParameters(Parameters);
return(rsa.Decrypt(e.Ciphertext, true));
}
}
public static byte[] DecodeHex(this string s)
{
if (s.Length % 2 != 0)
{
throw ExceptionFactory.MakeInvalidOperation(
"DecodeHex: input length must be multiple of 2");
}
var bytes = new byte[s.Length / 2];
for (var i = 0; i < s.Length / 2; ++i)
{
var b = 0;
for (var j = 0; j < 2; ++j)
{
b <<= 4;
var c = char.ToLower(s[i * 2 + j]);
if (c >= '0' && c <= '9')
{
b |= c - '0';
}
else if (c >= 'a' && c <= 'f')
{
b |= c - 'a' + 10;
}
else
{
throw ExceptionFactory.MakeInvalidOperation(
"DecodeHex: input contains invalid characters");
}
}
bytes[i] = (byte)b;
}
return(bytes);
}
