/*
    Licensed to the Apache Software Foundation (ASF) under one
    or more contributor license agreements.  See the NOTICE file
    distributed with this work for additional information
    regarding copyright ownership.  The ASF licenses this file
    to you under the Apache License, Version 2.0 (the
    "License"); you may not use this file except in compliance
    with the License.  You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

    Unless required by applicable law or agreed to in writing,
    software distributed under the License is distributed on an
    "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    KIND, either express or implied.  See the License for the
    specific language governing permissions and limitations
    under the License.
*/

/* Test HASH function - test driver and function exerciser for SHA256, SHA384, SHA512 API Functions */

var CTX = require("../index");

var chai = require('chai');

var expect = chai.expect;

var ctx = new CTX();


var bytestostring = function(b) {
    var s = "";
    var len = b.length;
    var ch;

    for (var i = 0; i < len; i++) {
        ch = b[i];
        s += ((ch >>> 4) & 15).toString(16);
        s += (ch & 15).toString(16);
    }
    return s;
}

var stringtobytes = function(s) {
    var b = [];
    for (var i = 0; i < s.length; i++)
        b.push(s.charCodeAt(i));
    return b;
}

hextobytes = function(value_hex) {
    // "use strict";
    var len, byte_value, i;

    len = value_hex.length;
    byte_value = [];

    for (i = 0; i < len; i += 2) {
        byte_value[(i / 2)] = parseInt(value_hex.substr(i, 2), 16);
    }
    return byte_value;
};

var hashit = function(sha, B) {
    var R = [];

    if (sha == ctx.HASH256.len) {
        var H = new ctx.HASH256();
        H.process_array(B);
        R = H.hash();
    }
    else if (sha == ctx.HASH384.len) {
        var H = new ctx.HASH384();
        H.process_array(B);
        R = H.hash();
    }
    else if (sha == ctx.HASH512.len) {
        var H = new ctx.HASH512();
        H.process_array(B);
        R = H.hash();
    }
    if (R.length == 0) return null;
    return R;
}

describe('TEST HASH', function() {

    it('test SHA256', function(done) {
        this.timeout(0);

        var vectors = require('../testVectors/sha/SHA256.json');
        var dig;

        for (var vector in vectors) {
            dig = hashit(ctx.HASH256.len, hextobytes(vectors[vector].IN));
            expect(bytestostring(dig)).to.be.equal(vectors[vector].OUT);
        }
        done();
    });

    it('test SHA384', function(done) {
        this.timeout(0);

        var vectors = require('../testVectors/sha/SHA384.json');
        var dig;

        for (var vector in vectors) {
            dig = hashit(ctx.HASH384.len, hextobytes(vectors[vector].IN));
            expect(bytestostring(dig)).to.be.equal(vectors[vector].OUT);
        }
        done();
    });

    it('test SHA512', function(done) {
        this.timeout(0);

        var vectors = require('../testVectors/sha/SHA512.json');
        var dig;

        for (var vector in vectors) {
            dig = hashit(ctx.HASH512.len, hextobytes(vectors[vector].IN));
            expect(bytestostring(dig)).to.be.equal(vectors[vector].OUT);
        }
        done();
    });

});