/// <inheritdoc/>
protected override byte[] HashFinal()
{
var output = new byte[digest.GetDigestSize()];
digest.DoFinal(output, 0);
return(output);
}
public static byte[] Digest(Org.BouncyCastle.Crypto.IDigest d, byte[] b, int offset, int len)
{
d.BlockUpdate(b, offset, len);
byte[] r = new byte[d.GetDigestSize()];
d.DoFinal(r, 0);
return(r);
}
} // End Function GetBouncyAlgorithm
protected override byte[] HashData(byte[] data, int offset, int count,
System.Security.Cryptography.HashAlgorithmName hashAlgorithm)
{
Org.BouncyCastle.Crypto.IDigest digest = GetBouncyAlgorithm(hashAlgorithm);
byte[] retValue = new byte[digest.GetDigestSize()];
digest.BlockUpdate(data, offset, count);
digest.DoFinal(retValue, 0);
return(retValue);
} // End Function HashData
public static byte[] Digest(System.IO.Stream data, Org.BouncyCastle.Crypto.IDigest messageDigest)
{
byte[] buf = new byte[8192];
int n;
while ((n = data.Read(buf, 0, buf.Length)) > 0)
{
messageDigest.BlockUpdate(buf, 0, n);
}
byte[] r = new byte[messageDigest.GetDigestSize()];
messageDigest.DoFinal(r, 0);
return(r);
}
} // End Function HashData
protected override byte[] HashData(System.IO.Stream data,
System.Security.Cryptography.HashAlgorithmName hashAlgorithm)
{
Org.BouncyCastle.Crypto.IDigest digest = GetBouncyAlgorithm(hashAlgorithm);
byte[] buffer = new byte[4096];
int cbSize;
while ((cbSize = data.Read(buffer, 0, buffer.Length)) > 0)
{
digest.BlockUpdate(buffer, 0, cbSize);
}
byte[] hash = new byte[digest.GetDigestSize()];
digest.DoFinal(hash, 0);
return(hash);
} // End Function HashData
public WindowsPrng()
{
// Don't use the bugged CryptoAPI
// this.m_rnd = new Org.BouncyCastle.Crypto.Prng.CryptoApiRandomGenerator();
Org.BouncyCastle.Crypto.IDigest digest = Org.BouncyCastle.Security.DigestUtilities.GetDigest("SHA256");
if (digest == null)
{
return;
}
Org.BouncyCastle.Crypto.Prng.DigestRandomGenerator prng =
new Org.BouncyCastle.Crypto.Prng.DigestRandomGenerator(digest);
prng.AddSeedMaterial(NextCounterValue());
prng.AddSeedMaterial(GetNextBytes(digest.GetDigestSize()));
this.m_rnd = prng;
}
private static byte[] GetByteRangeDigest(PdfDocument document, PdfPKCS7 pkcs7, PdfSignature signature, string digestAlg)
{
Org.BouncyCastle.Crypto.IDigest digest = Org.BouncyCastle.Security.DigestUtilities.GetDigest(digestAlg);
iText.Kernel.Pdf.PdfArray b = signature.GetByteRange();
iText.IO.Source.RandomAccessFileOrArray rf = document.GetReader().GetSafeFile();
Stream rg = null;
try
{
rg = new iText.IO.Source.RASInputStream(new iText.IO.Source.RandomAccessSourceFactory().CreateRanged(rf.CreateSourceView(), b.ToLongArray(
)));
byte[] buf = new byte[8192];
int rd;
while ((rd = rg.Read(buf, 0, buf.Length)) > 0)
{
digest.BlockUpdate(buf, 0, rd);
}
byte[] dig = new byte[digest.GetDigestSize()];
digest.DoFinal(dig, 0);
return(dig);
}
catch (Exception e)
{
throw new iText.Kernel.PdfException(e);
}
finally
{
try
{
if (rg != null)
{
rg.Dispose();
}
}
catch (System.IO.IOException e)
{
// this really shouldn't ever happen - the source view we use is based on a Safe view, which is a no-op anyway
throw new iText.Kernel.PdfException(e);
}
}
}
