public byte[] ComputeSHA1(byte[] data, int offset, int count)
{
var digest = new Sha1Digest();
digest.BlockUpdate(data, offset, count);
var output = new byte[20];
digest.DoFinal(output, 0);
return output;
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public Sha1Digest(Sha1Digest t)
: base(t)
{
H1 = t.H1;
H2 = t.H2;
H3 = t.H3;
H4 = t.H4;
H5 = t.H5;
Array.Copy(t.X, 0, X, 0, t.X.Length);
xOff = t.xOff;
}
/**
* Copy constructor. This will copy the state of the provided
* message digest.
*/
public Sha1Digest(Sha1Digest t)
: base(t)
{
H1 = t.H1;
H2 = t.H2;
H3 = t.H3;
H4 = t.H4;
H5 = t.H5;
Array.Copy(t.X, 0, X, 0, t.X.Length);
xOff = t.xOff;
}
public byte[] ComputeSHA1(Stream stream)
{
var digest = new Sha1Digest();
var buffer = new byte[256];
int read;
while ((read = stream.Read(buffer, 0, 256)) > 0)
{
digest.BlockUpdate(buffer, 0, read);
}
var output = new byte[20];
digest.DoFinal(output, 0);
return output;
}
/**
*
* Calulates the keyidentifier using a SHA1 hash over the BIT STRING
* from SubjectPublicKeyInfo as defined in RFC2459.
*
* Example of making a AuthorityKeyIdentifier:
* <pre>
* SubjectPublicKeyInfo apki = new SubjectPublicKeyInfo((ASN1Sequence)new ASN1InputStream(
* publicKey.getEncoded()).readObject());
* AuthorityKeyIdentifier aki = new AuthorityKeyIdentifier(apki);
* </pre>
*
**/
public AuthorityKeyIdentifier(
SubjectPublicKeyInfo spki)
{
IDigest digest = new Sha1Digest();
byte[] resBuf = new byte[digest.GetDigestSize()];
byte[] bytes = spki.PublicKeyData.GetBytes();
digest.BlockUpdate(bytes, 0, bytes.Length);
digest.DoFinal(resBuf, 0);
this.keyidentifier = new DerOctetString(resBuf);
}
/**
* create an AuthorityKeyIdentifier with the GeneralNames tag and
* the serial number provided as well.
*/
public AuthorityKeyIdentifier(
SubjectPublicKeyInfo spki,
GeneralNames name,
BigInteger serialNumber)
{
IDigest digest = new Sha1Digest();
byte[] resBuf = new byte[digest.GetDigestSize()];
byte[] bytes = spki.PublicKeyData.GetBytes();
digest.BlockUpdate(bytes, 0, bytes.Length);
digest.DoFinal(resBuf, 0);
this.keyidentifier = new DerOctetString(resBuf);
this.certissuer = name;
this.certserno = new DerInteger(serialNumber);
}
private static byte[] GetDigest(
SubjectPublicKeyInfo spki)
{
IDigest digest = new Sha1Digest();
byte[] resBuf = new byte[digest.GetDigestSize()];
byte[] bytes = spki.PublicKeyData.GetBytes();
digest.BlockUpdate(bytes, 0, bytes.Length);
digest.DoFinal(resBuf, 0);
return resBuf;
}
internal CombinedHash(CombinedHash t)
{
this.md5 = new MD5Digest(t.md5);
this.sha1 = new Sha1Digest(t.sha1);
}
internal CombinedHash()
{
this.md5 = new MD5Digest();
this.sha1 = new Sha1Digest();
}
private DsaParameters GenerateParameters_FIPS186_2()
{
byte[] seed = new byte[20];
byte[] part1 = new byte[20];
byte[] part2 = new byte[20];
byte[] u = new byte[20];
Sha1Digest sha1 = new Sha1Digest();
int n = (L - 1) / 160;
byte[] w = new byte[L / 8];
for (;;)
{
random.NextBytes(seed);
Hash(sha1, seed, part1);
Array.Copy(seed, 0, part2, 0, seed.Length);
Inc(part2);
Hash(sha1, part2, part2);
for (int i = 0; i != u.Length; i++)
{
u[i] = (byte)(part1[i] ^ part2[i]);
}
u[0] |= (byte)0x80;
u[19] |= (byte)0x01;
BigInteger q = new BigInteger(1, u);
if (!q.IsProbablePrime(certainty))
continue;
byte[] offset = Arrays.Clone(seed);
Inc(offset);
for (int counter = 0; counter < 4096; ++counter)
{
for (int k = 0; k < n; k++)
{
Inc(offset);
Hash(sha1, offset, part1);
Array.Copy(part1, 0, w, w.Length - (k + 1) * part1.Length, part1.Length);
}
Inc(offset);
Hash(sha1, offset, part1);
Array.Copy(part1, part1.Length - ((w.Length - (n) * part1.Length)), w, 0, w.Length - n * part1.Length);
w[0] |= (byte)0x80;
BigInteger x = new BigInteger(1, w);
BigInteger c = x.Mod(q.ShiftLeft(1));
BigInteger p = x.Subtract(c.Subtract(BigInteger.One));
if (p.BitLength != L)
continue;
if (p.IsProbablePrime(certainty))
{
BigInteger g = CalculateGenerator_FIPS186_2(p, q, random);
return new DsaParameters(p, q, g, new DsaValidationParameters(seed, counter));
}
}
}
}
