Implement Merkle hash verification
diff --git a/js/encoding/ASN1/base64.js b/js/encoding/ASN1/base64.js
new file mode 100644
index 0000000..1251aed
--- /dev/null
+++ b/js/encoding/ASN1/base64.js
@@ -0,0 +1,78 @@
+// Base64 JavaScript decoder
+// Copyright (c) 2008 Lapo Luchini <lapo@lapo.it>
+
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted, provided that the above
+// copyright notice and this permission notice appear in all copies.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+Base64 = {};
+
+Base64.decode = function(a) {
+ if (Base64.decoder == undefined) {
+ var b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
+ var allow = "= \f\n\r\t\u00A0\u2028\u2029";
+ var dec = [];
+ for (var i = 0; i < 64; ++i)
+ dec[b64.charAt(i)] = i;
+ for (var i = 0; i < allow.length; ++i)
+ dec[allow.charAt(i)] = -1;
+ Base64.decoder = dec;
+ }
+ var out = [];
+ var bits = 0, char_count = 0;
+ for (var i = 0; i < a.length; ++i) {
+ var c = a.charAt(i);
+ if (c == '=')
+ break;
+ c = Base64.decoder[c];
+ if (c == -1)
+ continue;
+ if (c == undefined)
+ throw 'Illegal character at offset ' + i;
+ bits |= c;
+ if (++char_count >= 4) {
+ out[out.length] = (bits >> 16);
+ out[out.length] = (bits >> 8) & 0xFF;
+ out[out.length] = bits & 0xFF;
+ bits = 0;
+ char_count = 0;
+ } else {
+ bits <<= 6;
+ }
+ }
+ switch (char_count) {
+ case 1:
+ throw "Base64 encoding incomplete: at least 2 bits missing";
+ break;
+ case 2:
+ out[out.length] = (bits >> 10);
+ break;
+ case 3:
+ out[out.length] = (bits >> 16);
+ out[out.length] = (bits >> 8) & 0xFF;
+ break;
+ }
+ return out;
+}
+
+Base64.re = /-----BEGIN [^-]+-----([A-Za-z0-9+\/=\s]+)-----END [^-]+-----|begin-base64[^\n]+\n([A-Za-z0-9+\/=\s]+)====/;
+Base64.unarmor = function(a) {
+ var m = Base64.re.exec(a);
+ if (m) {
+ if (m[1])
+ a = m[1];
+ else if (m[2])
+ a = m[2];
+ else
+ throw "RegExp out of sync";
+ }
+ return Base64.decode(a);
+}