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1 // Copyright 2014 The Chromium Authors. All rights reserved. | 1 // Copyright 2014 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 // SHA256 in javascript. | 5 // SHA256 in javascript. |
6 // | 6 // |
7 // SHA256 { | 7 // SHA256 { |
8 // SHA256(); | 8 // SHA256(); |
9 // void reset(); | 9 // void reset(); |
10 // void update(byte[] data, opt_length); | 10 // void update(byte[] data, opt_length); |
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44 SHA256.prototype.reset = function() { | 44 SHA256.prototype.reset = function() { |
45 this._chain = [ | 45 this._chain = [ |
46 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, | 46 0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a, |
47 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]; | 47 0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19]; |
48 | 48 |
49 this._inbuf = 0; | 49 this._inbuf = 0; |
50 this._total = 0; | 50 this._total = 0; |
51 }; | 51 }; |
52 | 52 |
53 /** Hash the next block of 64 bytes | 53 /** Hash the next block of 64 bytes |
54 * @param {Array.<number>} buf A 64 byte buffer | 54 * @param {Array<number>} buf A 64 byte buffer |
55 */ | 55 */ |
56 SHA256.prototype._compress = function(buf) { | 56 SHA256.prototype._compress = function(buf) { |
57 var W = this._W; | 57 var W = this._W; |
58 var k = this._k; | 58 var k = this._k; |
59 | 59 |
60 function _rotr(w, r) { return ((w << (32 - r)) | (w >>> r)); }; | 60 function _rotr(w, r) { return ((w << (32 - r)) | (w >>> r)); }; |
61 | 61 |
62 // get 16 big endian words | 62 // get 16 big endian words |
63 for (var i = 0; i < 64; i += 4) { | 63 for (var i = 0; i < 64; i += 4) { |
64 var w = (buf[i] << 24) | | 64 var w = (buf[i] << 24) | |
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106 this._chain[1] += B; | 106 this._chain[1] += B; |
107 this._chain[2] += C; | 107 this._chain[2] += C; |
108 this._chain[3] += D; | 108 this._chain[3] += D; |
109 this._chain[4] += E; | 109 this._chain[4] += E; |
110 this._chain[5] += F; | 110 this._chain[5] += F; |
111 this._chain[6] += G; | 111 this._chain[6] += G; |
112 this._chain[7] += H; | 112 this._chain[7] += H; |
113 }; | 113 }; |
114 | 114 |
115 /** Update the hash with additional data | 115 /** Update the hash with additional data |
116 * @param {Array.<number>|Uint8Array} bytes The data | 116 * @param {Array<number>|Uint8Array} bytes The data |
117 * @param {number=} opt_length How many bytes to hash, if not all */ | 117 * @param {number=} opt_length How many bytes to hash, if not all */ |
118 SHA256.prototype.update = function(bytes, opt_length) { | 118 SHA256.prototype.update = function(bytes, opt_length) { |
119 if (!opt_length) opt_length = bytes.length; | 119 if (!opt_length) opt_length = bytes.length; |
120 | 120 |
121 this._total += opt_length; | 121 this._total += opt_length; |
122 for (var n = 0; n < opt_length; ++n) { | 122 for (var n = 0; n < opt_length; ++n) { |
123 this._buf[this._inbuf++] = bytes[n]; | 123 this._buf[this._inbuf++] = bytes[n]; |
124 if (this._inbuf == 64) { | 124 if (this._inbuf == 64) { |
125 this._compress(this._buf); | 125 this._compress(this._buf); |
126 this._inbuf = 0; | 126 this._inbuf = 0; |
127 } | 127 } |
128 } | 128 } |
129 }; | 129 }; |
130 | 130 |
131 /** Update the hash with a specified range from a data buffer | 131 /** Update the hash with a specified range from a data buffer |
132 * @param {Array.<number>} bytes The data buffer | 132 * @param {Array<number>} bytes The data buffer |
133 * @param {number} start Starting index of the range in bytes | 133 * @param {number} start Starting index of the range in bytes |
134 * @param {number} end End index, will not be included in range | 134 * @param {number} end End index, will not be included in range |
135 */ | 135 */ |
136 SHA256.prototype.updateRange = function(bytes, start, end) { | 136 SHA256.prototype.updateRange = function(bytes, start, end) { |
137 this._total += (end - start); | 137 this._total += (end - start); |
138 for (var n = start; n < end; ++n) { | 138 for (var n = start; n < end; ++n) { |
139 this._buf[this._inbuf++] = bytes[n]; | 139 this._buf[this._inbuf++] = bytes[n]; |
140 if (this._inbuf == 64) { | 140 if (this._inbuf == 64) { |
141 this._compress(this._buf); | 141 this._compress(this._buf); |
142 this._inbuf = 0; | 142 this._inbuf = 0; |
143 } | 143 } |
144 } | 144 } |
145 }; | 145 }; |
146 | 146 |
147 /** | 147 /** |
148 * Optionally update the hash with additional arguments, and return the | 148 * Optionally update the hash with additional arguments, and return the |
149 * resulting hash value. | 149 * resulting hash value. |
150 * @param {...*} var_args Data buffers to hash | 150 * @param {...*} var_args Data buffers to hash |
151 * @return {Array.<number>} the SHA256 hash value. | 151 * @return {Array<number>} the SHA256 hash value. |
152 */ | 152 */ |
153 SHA256.prototype.digest = function(var_args) { | 153 SHA256.prototype.digest = function(var_args) { |
154 for (var i = 0; i < arguments.length; ++i) | 154 for (var i = 0; i < arguments.length; ++i) |
155 this.update(arguments[i]); | 155 this.update(arguments[i]); |
156 | 156 |
157 var digest = new Array(32); | 157 var digest = new Array(32); |
158 var totalBits = this._total * 8; | 158 var totalBits = this._total * 8; |
159 | 159 |
160 // add pad 0x80 0x00* | 160 // add pad 0x80 0x00* |
161 if (this._inbuf < 56) | 161 if (this._inbuf < 56) |
162 this.update(this._pad, 56 - this._inbuf); | 162 this.update(this._pad, 56 - this._inbuf); |
163 else | 163 else |
164 this.update(this._pad, 64 - (this._inbuf - 56)); | 164 this.update(this._pad, 64 - (this._inbuf - 56)); |
165 | 165 |
166 // add # bits, big endian | 166 // add # bits, big endian |
167 for (var i = 63; i >= 56; --i) { | 167 for (var i = 63; i >= 56; --i) { |
168 this._buf[i] = totalBits & 255; | 168 this._buf[i] = totalBits & 255; |
169 totalBits >>>= 8; | 169 totalBits >>>= 8; |
170 } | 170 } |
171 | 171 |
172 this._compress(this._buf); | 172 this._compress(this._buf); |
173 | 173 |
174 var n = 0; | 174 var n = 0; |
175 for (var i = 0; i < 8; ++i) | 175 for (var i = 0; i < 8; ++i) |
176 for (var j = 24; j >= 0; j -= 8) | 176 for (var j = 24; j >= 0; j -= 8) |
177 digest[n++] = (this._chain[i] >> j) & 255; | 177 digest[n++] = (this._chain[i] >> j) & 255; |
178 | 178 |
179 return digest; | 179 return digest; |
180 }; | 180 }; |
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