34 lines
742 B
JavaScript
34 lines
742 B
JavaScript
'use strict';
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var Bn = require('./bn');
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var Point = require('./point');
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var Hash = require('./hash');
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var Privkey = require('../privkey');
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var Keypair = require('../keypair');
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function KDF() {
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}
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KDF.buf2keypair = function(buf) {
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return KDF.sha256hmac2keypair(buf);
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};
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KDF.sha256hmac2keypair = function(buf) {
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var privkey = KDF.sha256hmac2privkey(buf);
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var keypair = Keypair().fromPrivkey(privkey);
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return keypair;
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};
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KDF.sha256hmac2privkey = function(buf) {
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var bn;
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var concat = new Buffer([]);
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do {
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var hash = Hash.sha256hmac(buf, concat);
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var bn = Bn.fromBuffer(hash);
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concat = Buffer.concat([concat, new Buffer(0)]);
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} while(!bn.lt(Point.getN()));
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return new Privkey({bn: bn});
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};
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module.exports = KDF;
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