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package org.spongycastle.crypto.tls;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* RFC 5246 7.4.1.4.1
*/
public class SignatureAndHashAlgorithm
{
protected short hash;
protected short signature;
/**
* @param hash {@link HashAlgorithm}
* @param signature {@link SignatureAlgorithm}
*/
public SignatureAndHashAlgorithm(short hash, short signature)
{
if (!TlsUtils.isValidUint8(hash))
{
throw new IllegalArgumentException("'hash' should be a uint8");
}
if (!TlsUtils.isValidUint8(signature))
{
throw new IllegalArgumentException("'signature' should be a uint8");
}
if (signature == SignatureAlgorithm.anonymous)
{
throw new IllegalArgumentException("'signature' MUST NOT be \"anonymous\"");
}
this.hash = hash;
this.signature = signature;
}
/**
* @return {@link HashAlgorithm}
*/
public short getHash()
{
return hash;
}
/**
* @return {@link SignatureAlgorithm}
*/
public short getSignature()
{
return signature;
}
public boolean equals(Object obj)
{
if (!(obj instanceof SignatureAndHashAlgorithm))
{
return false;
}
SignatureAndHashAlgorithm other = (SignatureAndHashAlgorithm)obj;
return other.getHash() == getHash() && other.getSignature() == getSignature();
}
public int hashCode()
{
return (getHash() << 16) | getSignature();
}
/**
* Encode this {@link SignatureAndHashAlgorithm} to an {@link OutputStream}.
*
* @param output the {@link OutputStream} to encode to.
* @throws IOException
*/
public void encode(OutputStream output)
throws IOException
{
TlsUtils.writeUint8(getHash(), output);
TlsUtils.writeUint8(getSignature(), output);
}
/**
* Parse a {@link SignatureAndHashAlgorithm} from an {@link InputStream}.
*
* @param input the {@link InputStream} to parse from.
* @return a {@link SignatureAndHashAlgorithm} object.
* @throws IOException
*/
public static SignatureAndHashAlgorithm parse(InputStream input)
throws IOException
{
short hash = TlsUtils.readUint8(input);
short signature = TlsUtils.readUint8(input);
return new SignatureAndHashAlgorithm(hash, signature);
}
}
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