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crypto: Streaming interface for Hash

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This commit is contained in:
isaacs 2012-10-29 11:31:59 -07:00
parent 3d3a0b3046
commit 90de2ddb77
2 changed files with 32 additions and 1 deletions
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17
lib/crypto.js
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@ -37,6 +37,9 @@ try {
var crypto = false;
}
var stream = require('stream');
var util = require('util');
// This is here because many functions accepted binary strings without
// any explicit encoding in older versions of node, and we don't want
// to break them unnecessarily.
@ -148,12 +151,24 @@ exports.createCredentials = function(options, context) {
exports.createHash = exports.Hash = Hash;
function Hash(algorithm) {
function Hash(algorithm, options) {
if (!(this instanceof Hash))
return new Hash(algorithm);
this._binding = new binding.Hash(algorithm);
stream.Transform.call(this, options);
}
util.inherits(Hash, stream.Transform);
Hash.prototype._transform = function(chunk, output, callback) {
this._binding.update(chunk);
callback();
};
Hash.prototype._flush = function(output, callback) {
output(this._binding.digest());
callback();
};
Hash.prototype.update = function(data, encoding) {
encoding = encoding || exports.DEFAULT_ENCODING;

16
test/simple/test-crypto.js
View File

@ -373,6 +373,18 @@ var a2 = crypto.createHash('sha256').update('Test123').digest('base64');
var a3 = crypto.createHash('sha512').update('Test123').digest(); // binary
var a4 = crypto.createHash('sha1').update('Test123').digest('buffer');
// stream interface
var a5 = crypto.createHash('sha512');
a5.end('Test123');
a5 = a5.read();
var a6 = crypto.createHash('sha512');
a6.write('Te');
a6.write('st');
a6.write('123');
a6.end();
a6 = a6.read();
assert.equal(a0, '8308651804facb7b9af8ffc53a33a22d6a1c8ac2', 'Test SHA1');
assert.equal(a1, 'h\u00ea\u00cb\u0097\u00d8o\fF!\u00fa+\u000e\u0017\u00ca' +
'\u00bd\u008c', 'Test MD5 as binary');
@ -392,6 +404,10 @@ assert.deepEqual(a4,
new Buffer('8308651804facb7b9af8ffc53a33a22d6a1c8ac2', 'hex'),
'Test SHA1');
// stream interface should produce the same result.
assert.deepEqual(a5, a3, 'stream interface is consistent');
assert.deepEqual(a6, a3, 'stream interface is consistent');
// Test multiple updates to same hash
var h1 = crypto.createHash('sha1').update('Test123').digest('hex');
var h2 = crypto.createHash('sha1').update('Test').update('123').digest('hex');