/// <summary>
/// Initializes this instance of an RSA signature algorithm.
/// </summary>
/// <param name="rsa">RSA cryptographic service provider to use.</param>
/// <param name="hashAlgorithm">Hash algorithm used to compute data digests for signing.</param>
private void InitializeAlgorithm(RSACryptoServiceProvider rsa, HashAlgorithm hashAlgorithm)
{
if (!(hashAlgorithm is SHA1) && !(hashAlgorithm is SHA256))
{
throw new SecurityException("Unacceptable hash algorithm");
}
if (!KEYSIZE_MAP.ContainsKey(rsa.KeySize))
{
throw new SecurityException("Unacceptable RSA key size: " + rsa.KeySize);
}
this.rsa = rsa;
int hashSize = KEYSIZE_MAP[rsa.KeySize];
if (hashSize != hashAlgorithm.HashSize)
{
throw new SecurityException("Unexpected hash size: " + hashAlgorithm.HashSize + " (expected " + hashSize + ")");
}
this.hashAlgorithm = hashAlgorithm;
//Compute the identity.
RSAParameters parameters = rsa.ExportParameters(false);
this.identity = new RSAIdentity(parameters);
}
public RSASignature(byte[] data, RSAIdentity identity, byte[] signature)
: base(data, identity)
{
this.signature = signature;
}
