fixed z85 encoding overflow bug, fixed signature code on big-endian systems.

tests/bart.pub

@@ -3,33 +3,33 @@
         Cipher: CURVE25519-ED25519-SALSA20-POLY1305
          Owner: Bart
           Mail: bart@local
-        Key-ID: 0x7AEFC16D88E43C2B
-    Public-Key: 1e2fw+W4a9:aMM[Z0fQ)4Vn!i}+SRl75j-AHe?mf2MK&8
- Creation Time: 2013-11-19T09:54:59
-      Checksum: 55:DC:88:01:EE:69:EA:C5:02:B6:A8:22:36:50:A1:CC
-                EB:73:3E:EC:2D:74:FC:D9:B2:10:D3:B5:D9:16:72:32
- Serial Number: 0x91FEE742
+        Key-ID: 0x9AD180B48F2746E7
+    Public-Key: 0$U$)i[>V06d$n&N6ehq2.#]UW$MQy8-MrNt!j/uu&Qfb
+ Creation Time: 2013-11-19T14:56:12
+      Checksum: 06:95:B5:78:15:E4:F7:DB:34:B2:02:ED:B5:3F:C9:6D
+                4F:20:1F:94:19:27:32:31:7C:E2:8F:A4:C4:30:29:12
+ Serial Number: 0xEBBF8898
    Key Version: 0x00000004
  Random Art ID: +----------------+
+                |      o         |
+                |     . +        |
+                |. . . . .       |
+                | o .   .        |
+                |= . .   .       |
+                | * o .          |
+                |. . .           |
                 |                |
-                |                |
-                |                |
-                |               o|
-                |        .  o .o.|
-                |         . o*.. |
-                |          =..+  |
-                |           +o   |
                 +----------------+
 
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 ------ END PCP PUBLICKEY ------