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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

/**
 * RFC 5246 7.4.1.4.1
 */
public class HashAlgorithm
{
    public static final short none = 0;
    public static final short md5 = 1;
    public static final short sha1 = 2;
    public static final short sha224 = 3;
    public static final short sha256 = 4;
    public static final short sha384 = 5;
    public static final short sha512 = 6;

    /*
     * RFC 8422
     */
    public static final short Intrinsic = 8;

    public static String getName(short hashAlgorithm)
    {
        switch (hashAlgorithm)
        {
        case none:
            return "none";
        case md5:
            return "md5";
        case sha1:
            return "sha1";
        case sha224:
            return "sha224";
        case sha256:
            return "sha256";
        case sha384:
            return "sha384";
        case sha512:
            return "sha512";
        case Intrinsic:
            return "Intrinsic";
        default:
            return "UNKNOWN";
        }
    }

    public static int getOutputSize(short hashAlgorithm)
    {
        switch (hashAlgorithm)
        {
        case md5:
            return 16;
        case sha1:
            return 20;
        case sha224:
            return 28;
        case sha256:
            return 32;
        case sha384:
            return 48;
        case sha512:
            return 64;
        default:
            return -1;
        }
    }

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

    public static boolean isPrivate(short hashAlgorithm)
    {
        return 224 <= hashAlgorithm && hashAlgorithm <= 255; 
    }

    public static boolean isRecognized(short hashAlgorithm)
    {
        switch (hashAlgorithm)
        {
        case md5:
        case sha1:
        case sha224:
        case sha256:
        case sha384:
        case sha512:
        case Intrinsic:
            return true;
        default:
            return false;
        }
    }
}