var sha = require('./sha.js');

module.exports = {
	md5: require('./md5.js'),
	sha1: sha.sha1,
	sha256: sha.sha256,
	sha224: sha.sha224,
	sha384: sha.sha384,
	sha512: sha.sha512,
	ripemd: require('./ripe-md.js'),

	/**
	 * Create a hash on the specified data using the specified algorithm
	 * @param {Integer} algo Hash algorithm type (see RFC4880 9.4)
	 * @param {String} data Data to be hashed
	 * @return {String} hash value
	 */
	digest: function(algo, data) {
		switch(algo) {
		case 1: // - MD5 [HAC]
			return this.md5(data);
		case 2: // - SHA-1 [FIPS180]
			return this.sha1(data);
		case 3: // - RIPE-MD/160 [HAC]
			return this.ripemd(data);
		case 8: // - SHA256 [FIPS180]
			return this.sha256(data);
		case 9: // - SHA384 [FIPS180]
			return this.sha384(data);
		case 10:// - SHA512 [FIPS180]
			return this.sha512(data);
		case 11:// - SHA224 [FIPS180]
			return this.sha224(data);
		default:
			throw new Error('Invalid hash function.');
		}
	},

	/**
	 * Returns the hash size in bytes of the specified hash algorithm type
	 * @param {Integer} algo Hash algorithm type (See RFC4880 9.4)
	 * @return {Integer} Size in bytes of the resulting hash
	 */
	getHashByteLength: function(algo) {
		switch(algo) {
		case 1: // - MD5 [HAC]
			return 16;
		case 2: // - SHA-1 [FIPS180]
		case 3: // - RIPE-MD/160 [HAC]
			return 20;
		case 8: // - SHA256 [FIPS180]
			return 32;
		case 9: // - SHA384 [FIPS180]
			return 48
		case 10:// - SHA512 [FIPS180]
			return 64;
		case 11:// - SHA224 [FIPS180]
			return 28;
		default:
			throw new Error('Invalid hash algorithm.');
		}
	}

}