/// <summary>
/// Computes the hash of certain parameters used in RSA certificates and keys.
/// </summary>
/// <param name="rsaParameters">The cryptographic RSA parameters.</param>
/// <param name="includePrivateParameters">true to include cryptographic RSA private parameters,
/// false to include only public ones.</param>
/// <param name="embeddedData">The embedded data to consider for computing
/// the hash.</param>
/// <returns>The hash.</returns>
public static IHash ComputeRsaHash(RSAParameters rsaParameters, bool includePrivateParameters,
IEnumerable <byte> embeddedData)
{
using (var stream = new MemoryStream())
{
var data = new List <byte[]>();
data.Add(rsaParameters.Exponent);
data.Add(rsaParameters.Modulus);
if (includePrivateParameters)
{
data.Add(new byte[] { 0x01 });
data.Add(rsaParameters.D);
data.Add(rsaParameters.DP);
data.Add(rsaParameters.DQ);
data.Add(rsaParameters.InverseQ);
data.Add(rsaParameters.P);
data.Add(rsaParameters.Q);
}
else
{
data.Add(new byte[] { 0x00 });
}
if (embeddedData != null)
{
data.Add(new byte[] { 0x01 });
data.Add(Sha512Hash.Compute(embeddedData.ToArray()).Hash.ToArray());
}
else
{
data.Add(new byte[] { 0x00 });
}
int i = 0;
foreach (var d in data)
{
var iBytes = BitConverter.GetBytes(i);
if (!BitConverter.IsLittleEndian)
{
iBytes = iBytes.Reverse().ToArray();
}
stream.Write(iBytes, 0, iBytes.Length);
var info = d;
if (!BitConverter.IsLittleEndian)
{
info = info.Reverse().ToArray();
}
stream.Write(info, 0, info.Length);
}
stream.Position = 0;
return(Sha512Hash.Compute(stream));
}
}
private IHash computeHash()
{
using (var stream = new MemoryStream())
{
var signerCertificateHashCountBytes = BitConverter.GetBytes(this.SignerCertificateHash.Hash.Count);
if (!BitConverter.IsLittleEndian)
{
signerCertificateHashCountBytes = signerCertificateHashCountBytes.Reverse().ToArray();
}
stream.Write(signerCertificateHashCountBytes, 0, signerCertificateHashCountBytes.Length);
stream.Write(this.SignerCertificateHash.Hash.ToArray(), 0, this.SignerCertificateHash.Hash.Count);
var signatureCountBytes = BitConverter.GetBytes(this.Signature.Count);
if (!BitConverter.IsLittleEndian)
{
signatureCountBytes = signatureCountBytes.Reverse().ToArray();
}
stream.Write(signatureCountBytes, 0, signatureCountBytes.Length);
stream.Write(this.Signature.ToArray(), 0, this.Signature.Count);
stream.Position = 0;
return(Sha512Hash.Compute(stream));
}
}
