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ECSignature: remove use of assert

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This commit is contained in:
Daniel Cousens 2015-08-11 17:21:04 +10:00
parent f2f0747187
commit c1a965d096
1 changed files with 7 additions and 10 deletions
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17
src/ecsignature.js
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@ -1,4 +1,3 @@
var assert = require('assert')
var typeforce = require('typeforce')
var types = require('./types')
@ -13,22 +12,20 @@ function ECSignature (r, s) {
}
ECSignature.parseCompact = function (buffer) {
assert.equal(buffer.length, 65, 'Invalid signature length')
var i = buffer.readUInt8(0) - 27
if (buffer.length !== 65) throw new Error('Invalid signature length')
// At most 3 bits
assert.equal(i, i & 7, 'Invalid signature parameter')
var compressed = !!(i & 4)
var flagByte = buffer.readUInt8(0) - 27
if (flagByte !== (flagByte & 7)) throw new Error('Invalid signature parameter')
// Recovery param only
i = i & 3
var compressed = !!(flagByte & 4)
var recoveryParam = flagByte & 3
var r = BigInteger.fromBuffer(buffer.slice(1, 33))
var s = BigInteger.fromBuffer(buffer.slice(33))
return {
compressed: compressed,
i: i,
i: recoveryParam,
signature: new ECSignature(r, s)
}
}
@ -118,7 +115,7 @@ ECSignature.prototype.toDER = function () {
ECSignature.prototype.toScriptSignature = function (hashType) {
var hashTypeMod = hashType & ~0x80
assert(hashTypeMod > 0x00 && hashTypeMod < 0x04, 'Invalid hashType ' + hashType)
if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
var hashTypeBuffer = new Buffer(1)
hashTypeBuffer.writeUInt8(hashType, 0)