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+/**
+ * Message Digest Algorithm 5 with 128-bit digest (MD5) implementation.
+ *
+ * @author Dave Longley
+ *
+ * Copyright (c) 2010-2014 Digital Bazaar, Inc.
+ */
+var forge = require('./forge');
+require('./md');
+require('./util');
+
+var md5 = module.exports = forge.md5 = forge.md5 || {};
+forge.md.md5 = forge.md.algorithms.md5 = md5;
+
+/**
+ * Creates an MD5 message digest object.
+ *
+ * @return a message digest object.
+ */
+md5.create = function() {
+ // do initialization as necessary
+ if(!_initialized) {
+ _init();
+ }
+
+ // MD5 state contains four 32-bit integers
+ var _state = null;
+
+ // input buffer
+ var _input = forge.util.createBuffer();
+
+ // used for word storage
+ var _w = new Array(16);
+
+ // message digest object
+ var md = {
+ algorithm: 'md5',
+ blockLength: 64,
+ digestLength: 16,
+ // 56-bit length of message so far (does not including padding)
+ messageLength: 0,
+ // true message length
+ fullMessageLength: null,
+ // size of message length in bytes
+ messageLengthSize: 8
+ };
+
+ /**
+ * Starts the digest.
+ *
+ * @return this digest object.
+ */
+ md.start = function() {
+ // up to 56-bit message length for convenience
+ md.messageLength = 0;
+
+ // full message length (set md.messageLength64 for backwards-compatibility)
+ md.fullMessageLength = md.messageLength64 = [];
+ var int32s = md.messageLengthSize / 4;
+ for(var i = 0; i < int32s; ++i) {
+ md.fullMessageLength.push(0);
+ }
+ _input = forge.util.createBuffer();
+ _state = {
+ h0: 0x67452301,
+ h1: 0xEFCDAB89,
+ h2: 0x98BADCFE,
+ h3: 0x10325476
+ };
+ return md;
+ };
+ // start digest automatically for first time
+ md.start();
+
+ /**
+ * Updates the digest with the given message input. The given input can
+ * treated as raw input (no encoding will be applied) or an encoding of
+ * 'utf8' maybe given to encode the input using UTF-8.
+ *
+ * @param msg the message input to update with.
+ * @param encoding the encoding to use (default: 'raw', other: 'utf8').
+ *
+ * @return this digest object.
+ */
+ md.update = function(msg, encoding) {
+ if(encoding === 'utf8') {
+ msg = forge.util.encodeUtf8(msg);
+ }
+
+ // update message length
+ var len = msg.length;
+ md.messageLength += len;
+ len = [(len / 0x100000000) >>> 0, len >>> 0];
+ for(var i = md.fullMessageLength.length - 1; i >= 0; --i) {
+ md.fullMessageLength[i] += len[1];
+ len[1] = len[0] + ((md.fullMessageLength[i] / 0x100000000) >>> 0);
+ md.fullMessageLength[i] = md.fullMessageLength[i] >>> 0;
+ len[0] = (len[1] / 0x100000000) >>> 0;
+ }
+
+ // add bytes to input buffer
+ _input.putBytes(msg);
+
+ // process bytes
+ _update(_state, _w, _input);
+
+ // compact input buffer every 2K or if empty
+ if(_input.read > 2048 || _input.length() === 0) {
+ _input.compact();
+ }
+
+ return md;
+ };
+
+ /**
+ * Produces the digest.
+ *
+ * @return a byte buffer containing the digest value.
+ */
+ md.digest = function() {
+ /* Note: Here we copy the remaining bytes in the input buffer and
+ add the appropriate MD5 padding. Then we do the final update
+ on a copy of the state so that if the user wants to get
+ intermediate digests they can do so. */
+
+ /* Determine the number of bytes that must be added to the message
+ to ensure its length is congruent to 448 mod 512. In other words,
+ the data to be digested must be a multiple of 512 bits (or 128 bytes).
+ This data includes the message, some padding, and the length of the
+ message. Since the length of the message will be encoded as 8 bytes (64
+ bits), that means that the last segment of the data must have 56 bytes
+ (448 bits) of message and padding. Therefore, the length of the message
+ plus the padding must be congruent to 448 mod 512 because
+ 512 - 128 = 448.
+
+ In order to fill up the message length it must be filled with
+ padding that begins with 1 bit followed by all 0 bits. Padding
+ must *always* be present, so if the message length is already
+ congruent to 448 mod 512, then 512 padding bits must be added. */
+
+ var finalBlock = forge.util.createBuffer();
+ finalBlock.putBytes(_input.bytes());
+
+ // compute remaining size to be digested (include message length size)
+ var remaining = (
+ md.fullMessageLength[md.fullMessageLength.length - 1] +
+ md.messageLengthSize);
+
+ // add padding for overflow blockSize - overflow
+ // _padding starts with 1 byte with first bit is set (byte value 128), then
+ // there may be up to (blockSize - 1) other pad bytes
+ var overflow = remaining & (md.blockLength - 1);
+ finalBlock.putBytes(_padding.substr(0, md.blockLength - overflow));
+
+ // serialize message length in bits in little-endian order; since length
+ // is stored in bytes we multiply by 8 and add carry
+ var bits, carry = 0;
+ for(var i = md.fullMessageLength.length - 1; i >= 0; --i) {
+ bits = md.fullMessageLength[i] * 8 + carry;
+ carry = (bits / 0x100000000) >>> 0;
+ finalBlock.putInt32Le(bits >>> 0);
+ }
+
+ var s2 = {
+ h0: _state.h0,
+ h1: _state.h1,
+ h2: _state.h2,
+ h3: _state.h3
+ };
+ _update(s2, _w, finalBlock);
+ var rval = forge.util.createBuffer();
+ rval.putInt32Le(s2.h0);
+ rval.putInt32Le(s2.h1);
+ rval.putInt32Le(s2.h2);
+ rval.putInt32Le(s2.h3);
+ return rval;
+ };
+
+ return md;
+};
+
+// padding, constant tables for calculating md5
+var _padding = null;
+var _g = null;
+var _r = null;
+var _k = null;
+var _initialized = false;
+
+/**
+ * Initializes the constant tables.
+ */
+function _init() {
+ // create padding
+ _padding = String.fromCharCode(128);
+ _padding += forge.util.fillString(String.fromCharCode(0x00), 64);
+
+ // g values
+ _g = [
+ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
+ 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12,
+ 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2,
+ 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9];
+
+ // rounds table
+ _r = [
+ 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
+ 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
+ 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
+ 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21];
+
+ // get the result of abs(sin(i + 1)) as a 32-bit integer
+ _k = new Array(64);
+ for(var i = 0; i < 64; ++i) {
+ _k[i] = Math.floor(Math.abs(Math.sin(i + 1)) * 0x100000000);
+ }
+
+ // now initialized
+ _initialized = true;
+}
+
+/**
+ * Updates an MD5 state with the given byte buffer.
+ *
+ * @param s the MD5 state to update.
+ * @param w the array to use to store words.
+ * @param bytes the byte buffer to update with.
+ */
+function _update(s, w, bytes) {
+ // consume 512 bit (64 byte) chunks
+ var t, a, b, c, d, f, r, i;
+ var len = bytes.length();
+ while(len >= 64) {
+ // initialize hash value for this chunk
+ a = s.h0;
+ b = s.h1;
+ c = s.h2;
+ d = s.h3;
+
+ // round 1
+ for(i = 0; i < 16; ++i) {
+ w[i] = bytes.getInt32Le();
+ f = d ^ (b & (c ^ d));
+ t = (a + f + _k[i] + w[i]);
+ r = _r[i];
+ a = d;
+ d = c;
+ c = b;
+ b += (t << r) | (t >>> (32 - r));
+ }
+ // round 2
+ for(; i < 32; ++i) {
+ f = c ^ (d & (b ^ c));
+ t = (a + f + _k[i] + w[_g[i]]);
+ r = _r[i];
+ a = d;
+ d = c;
+ c = b;
+ b += (t << r) | (t >>> (32 - r));
+ }
+ // round 3
+ for(; i < 48; ++i) {
+ f = b ^ c ^ d;
+ t = (a + f + _k[i] + w[_g[i]]);
+ r = _r[i];
+ a = d;
+ d = c;
+ c = b;
+ b += (t << r) | (t >>> (32 - r));
+ }
+ // round 4
+ for(; i < 64; ++i) {
+ f = c ^ (b | ~d);
+ t = (a + f + _k[i] + w[_g[i]]);
+ r = _r[i];
+ a = d;
+ d = c;
+ c = b;
+ b += (t << r) | (t >>> (32 - r));
+ }
+
+ // update hash state
+ s.h0 = (s.h0 + a) | 0;
+ s.h1 = (s.h1 + b) | 0;
+ s.h2 = (s.h2 + c) | 0;
+ s.h3 = (s.h3 + d) | 0;
+
+ len -= 64;
+ }
+}