Added support for the Base58-encoded private key format

Author: phedny

src/eckey.js

@@ -15,8 +15,13 @@ Bitcoin.ECKey = (function () {
  // Prepend zero byte to prevent interpretation as negative integer
  this.priv = BigInteger.fromByteArrayUnsigned(input);
  } else if ("string" == typeof input) {
- // Prepend zero byte to prevent interpretation as negative integer
- this.priv = BigInteger.fromByteArrayUnsigned(Crypto.util.base64ToBytes(input));
+ if (input.length == 51 && input[0] == '5') {
+ // Base58 encoded private key
+ this.priv = BigInteger.fromByteArrayUnsigned(ECKey.decodeString(input));
+ } else {
+ // Prepend zero byte to prevent interpretation as negative integer
+ this.priv = BigInteger.fromByteArrayUnsigned(Crypto.util.base64ToBytes(input));
+ }
  }
  };
 
@@ -44,6 +49,14 @@ Bitcoin.ECKey = (function () {
  return addr;
  };
 
+ ECKey.prototype.getExportedPrivateKey = function () {
+ var hash = this.priv.toByteArrayUnsigned();
+ hash.unshift(0x80);
+ var checksum = Crypto.SHA256(Crypto.SHA256(hash, {asBytes: true}), {asBytes: true});
+ var bytes = hash.concat(checksum.slice(0,4));
+ return Bitcoin.Base58.encode(bytes);
+ };
+
  ECKey.prototype.setPub = function (pub) {
  this.pub = pub;
  };
@@ -64,5 +77,31 @@ Bitcoin.ECKey = (function () {
  return ECDSA.verify(hash, sig, this.getPub());
  };
 
+ /**
+ * Parse an exported private key contained in a string.
+ */
+ ECKey.decodeString = function (string) {
+ var bytes = Bitcoin.Base58.decode(string);
+
+ var hash = bytes.slice(0, 33);
+
+ var checksum = Crypto.SHA256(Crypto.SHA256(hash, {asBytes: true}), {asBytes: true});
+
+ if (checksum[0] != bytes[33] ||
+ checksum[1] != bytes[34] ||
+ checksum[2] != bytes[35] ||
+ checksum[3] != bytes[36]) {
+ throw "Checksum validation failed!";
+ }
+
+ var version = hash.shift();
+
+ if (version != 0x80) {
+ throw "Version "+version+" not supported!";
+ }
+
+ return hash;
+ };
+
  return ECKey;
 })();