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crypto: support GCM authenticated encryption mode.
This adds two new member functions getAuthTag and setAuthTag that are useful for AES-GCM encryption modes. Use getAuthTag after Cipheriv.final, transmit the tag along with the data and use Decipheriv.setAuthTag to have the encrypted data verified.
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| // Copyright Joyent, Inc. and other Node contributors. | ||
| // | ||
| // Permission is hereby granted, free of charge, to any person obtaining a | ||
| // copy of this software and associated documentation files (the | ||
| // "Software"), to deal in the Software without restriction, including | ||
| // without limitation the rights to use, copy, modify, merge, publish, | ||
| // distribute, sublicense, and/or sell copies of the Software, and to permit | ||
| // persons to whom the Software is furnished to do so, subject to the | ||
| // following conditions: | ||
| // | ||
| // The above copyright notice and this permission notice shall be included | ||
| // in all copies or substantial portions of the Software. | ||
| // | ||
| // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS | ||
| // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
| // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN | ||
| // NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, | ||
| // DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR | ||
| // OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE | ||
| // USE OR OTHER DEALINGS IN THE SOFTWARE. | ||
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| var common = require('../common'); | ||
| var assert = require('assert'); | ||
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| try { | ||
| var crypto = require('crypto'); | ||
| } catch (e) { | ||
| console.log('Not compiled with OPENSSL support.'); | ||
| process.exit(); | ||
| } | ||
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| crypto.DEFAULT_ENCODING = 'buffer'; | ||
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| // | ||
| // Test authenticated encryption modes. | ||
| // | ||
| // !NEVER USE STATIC IVs IN REAL LIFE! | ||
| // | ||
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| var TEST_CASES = [ | ||
| { algo: 'aes-128-gcm', key: 'ipxp9a6i1Mb4USb4', iv: 'X6sIq117H0vR', | ||
| plain: 'Hello World!', ct: '4BE13896F64DFA2C2D0F2C76', | ||
| tag: '272B422F62EB545EAA15B5FF84092447', tampered: false }, | ||
| { algo: 'aes-128-gcm', key: 'ipxp9a6i1Mb4USb4', iv: 'X6sIq117H0vR', | ||
| plain: 'Hello World!', ct: '4BE13596F64DFA2C2D0FAC76', | ||
| tag: '272B422F62EB545EAA15B5FF84092447', tampered: true }, | ||
| { algo: 'aes-256-gcm', key: '3zTvzr3p67VC61jmV54rIYu1545x4TlY', | ||
| iv: '60iP0h6vJoEa', plain: 'Hello node.js world!', | ||
| ct: '58E62CFE7B1D274111A82267EBB93866E72B6C2A', | ||
| tag: '9BB44F663BADABACAE9720881FB1EC7A', tampered: false }, | ||
| { algo: 'aes-256-gcm', key: '3zTvzr3p67VC61jmV54rIYu1545x4TlY', | ||
| iv: '60iP0h6vJoEa', plain: 'Hello node.js world!', | ||
| ct: '58E62CFF7B1D274011A82267EBB93866E72B6C2B', | ||
| tag: '9BB44F663BADABACAE9720881FB1EC7A', tampered: true }, | ||
| ]; | ||
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| var ciphers = crypto.getCiphers(); | ||
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| for (var i in TEST_CASES) { | ||
| var test = TEST_CASES[i]; | ||
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| if (ciphers.indexOf(test.algo) == -1) { | ||
| console.log('skipping unsupported ' + test.algo + ' test'); | ||
| continue; | ||
| } | ||
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| (function() { | ||
| var encrypt = crypto.createCipheriv(test.algo, test.key, test.iv); | ||
| var hex = encrypt.update(test.plain, 'ascii', 'hex'); | ||
| hex += encrypt.final('hex'); | ||
| var auth_tag = encrypt.getAuthTag(); | ||
| // only test basic encryption run if output is marked as tampered. | ||
| if (!test.tampered) { | ||
| assert.equal(hex.toUpperCase(), test.ct); | ||
| assert.equal(auth_tag.toString('hex').toUpperCase(), test.tag); | ||
| } | ||
| })(); | ||
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| (function() { | ||
| var decrypt = crypto.createDecipheriv(test.algo, test.key, test.iv); | ||
| decrypt.setAuthTag(new Buffer(test.tag, 'hex')); | ||
| var msg = decrypt.update(test.ct, 'hex', 'ascii'); | ||
| if (!test.tampered) { | ||
| msg += decrypt.final('ascii'); | ||
| assert.equal(msg, test.plain); | ||
| } else { | ||
| // assert that final throws if input data could not be verified! | ||
| assert.throws(function() { decrypt.final('ascii'); }); | ||
| } | ||
| })(); | ||
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| // after normal operation, test some incorrect ways of calling the API: | ||
| // it's most certainly enough to run these tests with one algorithm only. | ||
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| if (i > 0) { | ||
| continue; | ||
| } | ||
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| (function() { | ||
| // non-authenticating mode: | ||
| var encrypt = crypto.createCipheriv('aes-128-cbc', | ||
| 'ipxp9a6i1Mb4USb4', '6fKjEjR3Vl30EUYC'); | ||
| encrypt.update('blah', 'ascii'); | ||
| encrypt.final(); | ||
| assert.throws(function() { encrypt.getAuthTag(); }); | ||
| })(); | ||
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| (function() { | ||
| // trying to get tag before inputting all data: | ||
| var encrypt = crypto.createCipheriv(test.algo, test.key, test.iv); | ||
| encrypt.update('blah', 'ascii'); | ||
| assert.throws(function() { encrypt.getAuthTag(); }); | ||
| })(); | ||
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| (function() { | ||
| // trying to set tag on encryption object: | ||
| var encrypt = crypto.createCipheriv(test.algo, test.key, test.iv); | ||
| assert.throws(function() { | ||
| encrypt.setAuthTag(new Buffer(test.tag, 'hex')); }); | ||
| })(); | ||
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| (function() { | ||
| // trying to read tag from decryption object: | ||
| var decrypt = crypto.createDecipheriv(test.algo, test.key, test.iv); | ||
| assert.throws(function() { decrypt.getAuthTag(); }); | ||
| })(); | ||
| } |