/// <summary>
/// Hash email address using SHA-256 hashing algorithm.
/// </summary>
/// <param name="digest">Provides the algorithm for SHA-256.</param>
/// <param name="email">The email address to hash.</param>
/// <returns>Hash email address using SHA-256 hashing algorithm.</returns>
private static String ToSha256String(GeneralDigest digest, String email)
{
byte[] data = Encoding.UTF8.GetBytes(email);
byte[] digestBytes = new byte[digest.GetDigestSize()];
digest.BlockUpdate(data, 0, data.Length);
digest.DoFinal(digestBytes, 0);
return(BitConverter.ToString(digestBytes).Replace("-", string.Empty));
}
private static byte[] ComputeDigest(GeneralDigest digest, byte[] input)
{
digest.BlockUpdate(input, 0, input.Length);
var output = new byte[digest.GetDigestSize()];
digest.DoFinal(output, 0);
return(output);
}
private string GetDigestValue(GeneralDigest digest)
{
var buffer = new byte[digest.GetDigestSize()];
digest.DoFinal(buffer, 0);
return(Convert.ToBase64String(buffer));
}
static public byte[] Digest(byte[] data, GeneralDigest digest)
{
var hashed = new byte[digest.GetDigestSize()];
digest.BlockUpdate(data, 0, data.Length);
digest.DoFinal(hashed, 0);
return(hashed);
}
/// <summary>
/// Creates a human readable fingerprint for this certificate. This fingerprint may be
/// compared by a user with an other certificate's fingerprint to proof their equality.
/// </summary>
protected static string CreateFingerprint(GeneralDigest a_digestGenerator, byte[] a_data)
{
var digestData = new byte[a_digestGenerator.GetDigestSize()];
a_digestGenerator.BlockUpdate(a_data, 0, a_data.Length);
a_digestGenerator.DoFinal(digestData, 0);
return(string.Join(":", digestData.Select(x => x.ToString("X2"))));
}
/// <summary>
/// Hash a string value using SHA-256 hashing algorithm.
/// </summary>
/// <param name="digest">Provides the algorithm for SHA-256.</param>
/// <param name="value">The string value (e.g. an email address) to hash.</param>
/// <returns>The hashed value.</returns>
private static String ToSha256String(GeneralDigest digest, String value)
{
byte[] data = Encoding.UTF8.GetBytes(value);
byte[] digestBytes = new byte[digest.GetDigestSize()];
digest.BlockUpdate(data, 0, data.Length);
digest.DoFinal(digestBytes, 0);
// Convert the byte array into an unhyphenated hexadecimal string.
return(BitConverter.ToString(digestBytes).Replace("-", string.Empty));
}
private static byte[] HashIt(GeneralDigest hashAlgo, byte[] data, int offset = 0, int len = 0)
{
byte[] result;
lock (hashAlgo)
{
hashAlgo.Reset();
hashAlgo.BlockUpdate(data, offset, len == 0 ? data.Length - offset : len);
result = new byte[hashAlgo.GetDigestSize()];
hashAlgo.DoFinal(result, 0);
}
return(result);
}
