59 lines
1.8 KiB
JavaScript
59 lines
1.8 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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const types = require("./types");
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const bip66 = require('bip66');
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const typeforce = require('typeforce');
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const ZERO = Buffer.alloc(1, 0);
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function toDER(x) {
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let i = 0;
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while (x[i] === 0)
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++i;
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if (i === x.length)
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return ZERO;
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x = x.slice(i);
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if (x[0] & 0x80)
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return Buffer.concat([ZERO, x], 1 + x.length);
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return x;
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}
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function fromDER(x) {
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if (x[0] === 0x00)
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x = x.slice(1);
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const buffer = Buffer.alloc(32, 0);
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const bstart = Math.max(0, 32 - x.length);
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x.copy(buffer, bstart);
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return buffer;
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}
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// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
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function decode(buffer) {
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const hashType = buffer.readUInt8(buffer.length - 1);
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const hashTypeMod = hashType & ~0x80;
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if (hashTypeMod <= 0 || hashTypeMod >= 4)
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throw new Error('Invalid hashType ' + hashType);
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const decode = bip66.decode(buffer.slice(0, -1));
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const r = fromDER(decode.r);
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const s = fromDER(decode.s);
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return {
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signature: Buffer.concat([r, s], 64),
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hashType: hashType
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};
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}
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exports.decode = decode;
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function encode(signature, hashType) {
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typeforce({
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signature: types.BufferN(64),
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hashType: types.UInt8
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}, { signature, hashType });
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const hashTypeMod = hashType & ~0x80;
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if (hashTypeMod <= 0 || hashTypeMod >= 4)
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throw new Error('Invalid hashType ' + hashType);
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const hashTypeBuffer = Buffer.allocUnsafe(1);
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hashTypeBuffer.writeUInt8(hashType, 0);
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const r = toDER(signature.slice(0, 32));
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const s = toDER(signature.slice(32, 64));
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return Buffer.concat([
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bip66.encode(r, s),
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hashTypeBuffer
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]);
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}
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exports.encode = encode;
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