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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 SHA-1 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 big-endian order; since length // is stored in bytes we multiply by 8 and add carry from next int var next, carry; var bits = md.fullMessageLength[0] * 8; for(var i = 0; i < md.fullMessageLength.length - 1; ++i) { next = md.fullMessageLength[i + 1] * 8; carry = (next / 0x100000000) >>> 0; bits += carry; finalBlock.putInt32(bits >>> 0); bits = next >>> 0; } finalBlock.putInt32(bits); var s2 = { h0: _state.h0, h1: _state.h1, h2: _state.h2, h3: _state.h3, h4: _state.h4 }; _update(s2, _w, finalBlock); var rval = forge.util.createBuffer(); rval.putInt32(s2.h0); rval.putInt32(s2.h1); rval.putInt32(s2.h2); rval.putInt32(s2.h3); rval.putInt32(s2.h4); return rval; }; return md; }; // sha-1 padding bytes not initialized yet var _padding = null; var _initialized = false; /** * Initializes the constant tables. */ function _init() { // create padding _padding = String.fromCharCode(128); _padding += forge.util.fillString(String.fromCharCode(0x00), 64); // now initialized _initialized = true; } /** * Updates a SHA-1 state with the given byte buffer. * * @param s the SHA-1 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, e, f, i; var len = bytes.length(); while(len >= 64) { // the w array will be populated with sixteen 32-bit big-endian words // and then extended into 80 32-bit words according to SHA-1 algorithm // and for 32-79 using Max Locktyukhin's optimization // initialize hash value for this chunk a = s.h0; b = s.h1; c = s.h2; d = s.h3; e = s.h4; // round 1 for(i = 0; i < 16; ++i) { t = bytes.getInt32(); w[i] = t; f = d ^ (b & (c ^ d)); t = ((a << 5) | (a >>> 27)) + f + e + 0x5A827999 + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } for(; i < 20; ++i) { t = (w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16]); t = (t << 1) | (t >>> 31); w[i] = t; f = d ^ (b & (c ^ d)); t = ((a << 5) | (a >>> 27)) + f + e + 0x5A827999 + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } // round 2 for(; i < 32; ++i) { t = (w[i - 3] ^ w[i - 8] ^ w[i - 14] ^ w[i - 16]); t = (t << 1) | (t >>> 31); w[i] = t; f = b ^ c ^ d; t = ((a << 5) | (a >>> 27)) + f + e + 0x6ED9EBA1 + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } for(; i < 40; ++i) { t = (w[i - 6] ^ w[i - 16] ^ w[i - 28] ^ w[i - 32]); t = (t << 2) | (t >>> 30); w[i] = t; f = b ^ c ^ d; t = ((a << 5) | (a >>> 27)) + f + e + 0x6ED9EBA1 + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } // round 3 for(; i < 60; ++i) { t = (w[i - 6] ^ w[i - 16] ^ w[i - 28] ^ w[i - 32]); t = (t << 2) | (t >>> 30); w[i] = t; f = (b & c) | (d & (b ^ c)); t = ((a << 5) | (a >>> 27)) + f + e + 0x8F1BBCDC + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } // round 4 for(; i < 80; ++i) { t = (w[i - 6] ^ w[i - 16] ^ w[i - 28] ^ w[i - 32]); t = (t << 2) | (t >>> 30); w[i] = t; f = b ^ c ^ d; t = ((a << 5) | (a >>> 27)) + f + e + 0xCA62C1D6 + t; e = d; d = c; // `>>> 0` necessary to avoid iOS/Safari 10 optimization bug c = ((b << 30) | (b >>> 2)) >>> 0; b = a; a = t; } // 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; s.h4 = (s.h4 + e) | 0; len -= 64; } }