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