rm ECSignature, add script.signature instead

src/script_signature.js

@@ -0,0 +1,51 @@
+var bip66 = require('bip66')
+var BigInteger = require('bigi')
+var typeforce = require('typeforce')
+var types = require('./types')
+
+// BIP62: 1 byte hashType flag (only 0x01, 0x02, 0x03, 0x81, 0x82 and 0x83 are allowed)
+function decode (buffer) {
+  var hashType = buffer.readUInt8(buffer.length - 1)
+  var hashTypeMod = hashType & ~0x80
+  if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
+
+  var decode = bip66.decode(buffer.slice(0, -1))
+
+  return {
+    signature: {
+      r: BigInteger.fromDERInteger(decode.r),
+      s: BigInteger.fromDERInteger(decode.s)
+    },
+    hashType: hashType
+  }
+}
+
+function fromRSBuffer (buffer) {
+  typeforce(types.BufferN(64), buffer)
+
+  var r = BigInteger.fromBuffer(buffer.slice(0, 32))
+  var s = BigInteger.fromBuffer(buffer.slice(32, 64))
+  return { r: r, s: s }
+}
+
+function encode (signature, hashType) {
+  var hashTypeMod = hashType & ~0x80
+  if (hashTypeMod <= 0 || hashTypeMod >= 4) throw new Error('Invalid hashType ' + hashType)
+
+  var hashTypeBuffer = new Buffer(1)
+  hashTypeBuffer.writeUInt8(hashType, 0)
+
+  var r = new Buffer(signature.r.toDERInteger())
+  var s = new Buffer(signature.s.toDERInteger())
+
+  return Buffer.concat([
+    bip66.encode(r, s),
+    hashTypeBuffer
+  ])
+}
+
+module.exports = {
+  fromRSBuffer,
+  decode: decode,
+  encode: encode
+}