Mercurial > 510Connectbot
diff src/com/trilead/ssh2/crypto/digest/HashForSSH2Types.java @ 0:0ce5cc452d02
initial version
author | Carl Byington <carl@five-ten-sg.com> |
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date | Thu, 22 May 2014 10:41:19 -0700 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/com/trilead/ssh2/crypto/digest/HashForSSH2Types.java Thu May 22 10:41:19 2014 -0700 @@ -0,0 +1,81 @@ + +package com.trilead.ssh2.crypto.digest; + +import java.math.BigInteger; +import java.security.DigestException; +import java.security.MessageDigest; +import java.security.NoSuchAlgorithmException; + +/** + * HashForSSH2Types. + * + * @author Christian Plattner, plattner@trilead.com + * @version $Id: HashForSSH2Types.java,v 1.1 2007/10/15 12:49:57 cplattne Exp $ + */ +public class HashForSSH2Types { + MessageDigest md; + + public HashForSSH2Types(String type) { + try { + md = MessageDigest.getInstance(type); + } + catch (NoSuchAlgorithmException e) { + throw new RuntimeException("Unsupported algorithm " + type); + } + } + + public void updateByte(byte b) { + /* HACK - to test it with J2ME */ + byte[] tmp = new byte[1]; + tmp[0] = b; + md.update(tmp); + } + + public void updateBytes(byte[] b) { + md.update(b); + } + + public void updateUINT32(int v) { + md.update((byte)(v >> 24)); + md.update((byte)(v >> 16)); + md.update((byte)(v >> 8)); + md.update((byte)(v)); + } + + public void updateByteString(byte[] b) { + updateUINT32(b.length); + updateBytes(b); + } + + public void updateBigInt(BigInteger b) { + updateByteString(b.toByteArray()); + } + + public void reset() { + md.reset(); + } + + public int getDigestLength() { + return md.getDigestLength(); + } + + public byte[] getDigest() { + byte[] tmp = new byte[md.getDigestLength()]; + getDigest(tmp); + return tmp; + } + + public void getDigest(byte[] out) { + getDigest(out, 0); + } + + public void getDigest(byte[] out, int off) { + try { + md.digest(out, off, out.length - off); + } + catch (DigestException e) { + // TODO is this right?! + throw new RuntimeException("Unable to digest", e); + } + } +}