return the public key string

ryanramage · May 31, 2012 · c3f9291 · c3f9291
1 parent 6a58b30
commit c3f9291
Show file tree

Hide file tree

Showing 4 changed files with 58 additions and 3 deletions.
diff --git a/lib/base64.js b/lib/base64.js
@@ -71,3 +71,43 @@ exports.b64toBA = function (s) {
   }
   return a;
 }
+
+exports.b64to16 = function(s) {
+    var ret = "";
+    var i;
+    var k = 0;
+    var slop;
+    for (i = 0; i < s.length; ++i)
+    {
+        if (s.charAt(i) == "=") break;
+        v = b64map.indexOf(s.charAt(i));
+        if (v < 0) continue;
+        if (k == 0)
+        {
+            ret += jsbn.int2char(v >> 2);
+            slop = v & 3;
+            k = 1;
+        }
+        else if (k == 1)
+        {
+            ret += jsbn.int2char((slop << 2) | (v >> 4));
+            slop = v & 0xf;
+            k = 2;
+        }
+        else if (k == 2)
+        {
+            ret += jsb.int2char(slop);
+            ret += jsbn.int2char(v >> 2);
+            slop = v & 3;
+            k = 3;
+        }
+        else
+        {
+            ret += jsbn.int2char((slop << 2) | (v >> 4));
+            ret += jsbn.int2char(v & 0xf);
+            k = 0;
+        }
+    }
+    if (k == 1) ret += jsbn.int2char(slop << 2);
+    return ret;
+}
diff --git a/lib/rsa.js b/lib/rsa.js
@@ -780,5 +780,5 @@ RSAKey.prototype.readPrivateKeyFromPEMString = _rsapem_readPrivateKeyFromPEMStri
 
 
 
-exports.RSAKey = RSAKey;
+    exports.RSAKey = RSAKey;
 exports.Math = Math;  // so we can seed the rng.
diff --git a/rsa.js b/rsa.js
@@ -4,7 +4,7 @@ if (typeof define !== 'function') {
 
 define(function(require) {
     var rsa = require('./lib/rsa');
-
+    var base64 = require('./lib/base64')
     var my = {};
 
     my.generate = function(passphrase, options, callback) {
@@ -29,7 +29,21 @@ define(function(require) {
         return key;
     }
 
+    my.publicKeyFromString = function(string)
+    {
+        var N = base64.b64to16(string.split("|")[0]);
+        var E = "03";
+        var rsa = new rsa.RSAKey();
+        rsa.setPublic(N, E);
+        return rsa
+    }
 
+    // Returns the ascii-armored version of the public key.
+    my.publicKeyString = function(rsakey)
+    {
+        pubkey = base64.hex2b64(rsakey.n.toString(16));
+        return pubkey;
+    }
 
     return my;
 });
diff --git a/tests/amd-rsa-test.js b/tests/amd-rsa-test.js
@@ -20,7 +20,8 @@ test('Read Private RSA key', function(t) {
         console.log(data.toString());
         var private = rsa.privateFromPEM(data.toString());
         console.log(private);
-
+        var public = rsa.publicKeyString(private);
+        console.log(public);
         t.end();
     })