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This commit is contained in:
junderw 2019-04-21 21:30:21 +09:00
parent a52ef82e4f
commit e28e04427e
No known key found for this signature in database
GPG key ID: B256185D3A971908
45 changed files with 2947 additions and 2948 deletions

77
src/script_signature.js
View file

@ -1,53 +1,52 @@
"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const types = require("./types");
'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
const types = require('./types');
const bip66 = require('bip66');
const typeforce = require('typeforce');
const ZERO = Buffer.alloc(1, 0);
function toDER(x) {
let i = 0;
while (x[i] === 0)
++i;
if (i === x.length)
return ZERO;
x = x.slice(i);
if (x[0] & 0x80)
return Buffer.concat([ZERO, x], 1 + x.length);
return x;
let i = 0;
while (x[i] === 0) ++i;
if (i === x.length) return ZERO;
x = x.slice(i);
if (x[0] & 0x80) return Buffer.concat([ZERO, x], 1 + x.length);
return x;
}
function fromDER(x) {
if (x[0] === 0x00)
x = x.slice(1);
const buffer = Buffer.alloc(32, 0);
const bstart = Math.max(0, 32 - x.length);
x.copy(buffer, bstart);
return buffer;
if (x[0] === 0x00) x = x.slice(1);
const buffer = Buffer.alloc(32, 0);
const bstart = Math.max(0, 32 - x.length);
x.copy(buffer, bstart);
return buffer;
}
// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
function decode(buffer) {
const hashType = buffer.readUInt8(buffer.length - 1);
const hashTypeMod = hashType & ~0x80;
if (hashTypeMod <= 0 || hashTypeMod >= 4)
throw new Error('Invalid hashType ' + hashType);
const decoded = bip66.decode(buffer.slice(0, -1));
const r = fromDER(decoded.r);
const s = fromDER(decoded.s);
const signature = Buffer.concat([r, s], 64);
return { signature, hashType };
const hashType = buffer.readUInt8(buffer.length - 1);
const hashTypeMod = hashType & ~0x80;
if (hashTypeMod <= 0 || hashTypeMod >= 4)
throw new Error('Invalid hashType ' + hashType);
const decoded = bip66.decode(buffer.slice(0, -1));
const r = fromDER(decoded.r);
const s = fromDER(decoded.s);
const signature = Buffer.concat([r, s], 64);
return { signature, hashType };
}
exports.decode = decode;
function encode(signature, hashType) {
typeforce({
signature: types.BufferN(64),
hashType: types.UInt8,
}, { signature, hashType });
const hashTypeMod = hashType & ~0x80;
if (hashTypeMod <= 0 || hashTypeMod >= 4)
throw new Error('Invalid hashType ' + hashType);
const hashTypeBuffer = Buffer.allocUnsafe(1);
hashTypeBuffer.writeUInt8(hashType, 0);
const r = toDER(signature.slice(0, 32));
const s = toDER(signature.slice(32, 64));
return Buffer.concat([bip66.encode(r, s), hashTypeBuffer]);
typeforce(
{
signature: types.BufferN(64),
hashType: types.UInt8,
},
{ signature, hashType },
);
const hashTypeMod = hashType & ~0x80;
if (hashTypeMod <= 0 || hashTypeMod >= 4)
throw new Error('Invalid hashType ' + hashType);
const hashTypeBuffer = Buffer.allocUnsafe(1);
hashTypeBuffer.writeUInt8(hashType, 0);
const r = toDER(signature.slice(0, 32));
const s = toDER(signature.slice(32, 64));
return Buffer.concat([bip66.encode(r, s), hashTypeBuffer]);
}
exports.encode = encode;