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The Bouncy Castle Java APIs for TLS and DTLS, including a provider for the JSSE.

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package org.bouncycastle.tls;

/**
 * RFC 5246 7.4.1.4.1 (in RFC 2246, there were no specific values assigned)
 */
public class SignatureAlgorithm
{
    public static final short anonymous = 0;
    public static final short rsa = 1;
    public static final short dsa = 2;
    public static final short ecdsa = 3;

    public static String getName(short signatureAlgorithm)
    {
        switch (signatureAlgorithm)
        {
        case anonymous:
            return "anonymous";
        case rsa:
            return "rsa";
        case dsa:
            return "dsa";
        case ecdsa:
            return "ecdsa";
        default:
            return "UNKNOWN";
        }
    }

    public static String getText(short signatureAlgorithm)
    {
        return getName(signatureAlgorithm) + "(" + signatureAlgorithm + ")";
    }
}