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index.js
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index.js
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'use strict';
var Buffer = require('safe-buffer').Buffer;
var createHash = require('create-hash');
var stream = require('readable-stream');
var inherits = require('inherits');
var sign = require('./sign');
var verify = require('./verify');
var algorithms = require('./algorithms.json');
Object.keys(algorithms).forEach(function (key) {
algorithms[key].id = Buffer.from(algorithms[key].id, 'hex');
algorithms[key.toLowerCase()] = algorithms[key];
});
function Sign(algorithm) {
stream.Writable.call(this);
var data = algorithms[algorithm];
if (!data) { throw new Error('Unknown message digest'); }
this._hashType = data.hash;
this._hash = createHash(data.hash);
this._tag = data.id;
this._signType = data.sign;
}
inherits(Sign, stream.Writable);
Sign.prototype._write = function _write(data, _, done) {
this._hash.update(data);
done();
};
Sign.prototype.update = function update(data, enc) {
this._hash.update(typeof data === 'string' ? Buffer.from(data, enc) : data);
return this;
};
Sign.prototype.sign = function signMethod(key, enc) {
this.end();
var hash = this._hash.digest();
var sig = sign(hash, key, this._hashType, this._signType, this._tag);
return enc ? sig.toString(enc) : sig;
};
function Verify(algorithm) {
stream.Writable.call(this);
var data = algorithms[algorithm];
if (!data) { throw new Error('Unknown message digest'); }
this._hash = createHash(data.hash);
this._tag = data.id;
this._signType = data.sign;
}
inherits(Verify, stream.Writable);
Verify.prototype._write = function _write(data, _, done) {
this._hash.update(data);
done();
};
Verify.prototype.update = function update(data, enc) {
this._hash.update(typeof data === 'string' ? Buffer.from(data, enc) : data);
return this;
};
Verify.prototype.verify = function verifyMethod(key, sig, enc) {
var sigBuffer = typeof sig === 'string' ? Buffer.from(sig, enc) : sig;
this.end();
var hash = this._hash.digest();
return verify(sigBuffer, hash, key, this._signType, this._tag);
};
function createSign(algorithm) {
return new Sign(algorithm);
}
function createVerify(algorithm) {
return new Verify(algorithm);
}
module.exports = {
Sign: createSign,
Verify: createVerify,
createSign: createSign,
createVerify: createVerify
};