fromBuffer convenience function for pubkey

lib/pubkey.js

@@ -29,6 +29,10 @@ Pubkey.prototype.fromPrivkey = function(privkey) {
   return this;
 };
 
+Pubkey.prototype.fromBuffer = function(buf) {
+  return this.fromDER(buf);
+};
+
 Pubkey.prototype.fromDER = function(buf) {
   if (buf[0] == 0x04) {
     var xbuf = buf.slice(1, 33);

test/pubkey.js

@@ -40,6 +40,31 @@ describe('Pubkey', function() {
 
   });
 
+  describe('#fromBuffer', function() {
+    
+    it('should parse this uncompressed public key', function() {
+      var pk = new Pubkey();
+      pk.fromBuffer(new Buffer('041ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341', 'hex'));
+      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
+      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
+    });
+
+    it('should parse this compressed public key', function() {
+      var pk = new Pubkey();
+      pk.fromBuffer(new Buffer('031ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
+      pk.point.getX().toString(16).should.equal('1ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a');
+      pk.point.getY().toString(16).should.equal('7baad41d04514751e6851f5304fd243751703bed21b914f6be218c0fa354a341');
+    });
+
+    it('should throw an error on this invalid public key', function() {
+      var pk = new Pubkey();
+      (function() {
+        pk.fromBuffer(new Buffer('091ff0fe0f7b15ffaa85ff9f4744d539139c252a49710fb053bb9f2b933173ff9a', 'hex'));
+      }).should.throw();
+    });
+
+  });
+
   describe('#fromDER', function() {
     
     it('should parse this uncompressed public key', function() {