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author | 2020-11-16 00:10:28 +0100 | |
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committer | 2020-11-16 00:10:28 +0100 | |
commit | e06ec920f7a5d784e674c4c4b4e6d1da3dc7391d (patch) | |
tree | 55713f725f77b44ebfec86e4eec3ce33e71458ca /node_modules/buffer-equal-constant-time/index.js | |
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api, login, auth
Diffstat (limited to 'node_modules/buffer-equal-constant-time/index.js')
-rw-r--r-- | node_modules/buffer-equal-constant-time/index.js | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/node_modules/buffer-equal-constant-time/index.js b/node_modules/buffer-equal-constant-time/index.js new file mode 100644 index 0000000..5462c1f --- /dev/null +++ b/node_modules/buffer-equal-constant-time/index.js @@ -0,0 +1,41 @@ +/*jshint node:true */ +'use strict'; +var Buffer = require('buffer').Buffer; // browserify +var SlowBuffer = require('buffer').SlowBuffer; + +module.exports = bufferEq; + +function bufferEq(a, b) { + + // shortcutting on type is necessary for correctness + if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) { + return false; + } + + // buffer sizes should be well-known information, so despite this + // shortcutting, it doesn't leak any information about the *contents* of the + // buffers. + if (a.length !== b.length) { + return false; + } + + var c = 0; + for (var i = 0; i < a.length; i++) { + /*jshint bitwise:false */ + c |= a[i] ^ b[i]; // XOR + } + return c === 0; +} + +bufferEq.install = function() { + Buffer.prototype.equal = SlowBuffer.prototype.equal = function equal(that) { + return bufferEq(this, that); + }; +}; + +var origBufEqual = Buffer.prototype.equal; +var origSlowBufEqual = SlowBuffer.prototype.equal; +bufferEq.restore = function() { + Buffer.prototype.equal = origBufEqual; + SlowBuffer.prototype.equal = origSlowBufEqual; +}; |