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

tests/key-alicia-pub

@@ -3,33 +3,33 @@
         Cipher: CURVE25519-ED25519-SALSA20-POLY1305
          Owner: Alicia
           Mail: alicia@local
-        Key-ID: 0x7BDF786564A94A60
-    Public-Key: 1d10ok&9wTrr(Qb7}b$E3%Xzt0oCfQ)6Q$byko!{iSGcW
- Creation Time: 2013-11-19T09:54:59
-      Checksum: C0:18:A5:2A:A4:55:D0:CB:EA:7C:83:5E:D0:54:40:79
-                FB:0C:06:5D:18:CA:5B:03:E5:C7:96:7A:B8:50:01:33
- Serial Number: 0x96DA9F38
+        Key-ID: 0x23E0082C8250DB56
+    Public-Key: 1j-}eBc7.!-B{7%2E<jV8]me1R=A)%E*<A8H*Qbqa]?Py
+ Creation Time: 2013-11-19T14:56:11
+      Checksum: 86:A5:27:8C:C8:8E:2D:3E:14:36:6C:14:B9:1F:FB:2B
+                21:20:E7:D6:7C:E3:B1:C8:3B:49:3F:7E:07:5A:D3:ED
+ Serial Number: 0xC82855BB
    Key Version: 0x00000004
  Random Art ID: +----------------+
-                |      ..o...... |
-                |     o . o      |
-                |      o o       |
-                |       . .      |
-                |        * .     |
-                |       . + .    |
-                |          .     |
+                |                |
+                |           o oo |
+                |          . +o.o|
+                |         .   .+ |
+                |        .    ooo|
+                |              +o|
+                |             .  |
                 |                |
                 +----------------+
 
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-oV5/L9*Z=0i!C0S2[qh.mR^mgmQ&)![&<+&%vyM^J<fDcxKX!BwD5xRO2OX12jOsS[YuH:N
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-xq:e5^F#b{c&nC-j[x0eZoX+-2eir6.ARxh!4a}IoULk(lr2{y]!o}JDT-SVG78A%R5uCeB
-P.r^Ay[+K4p*uHTs*rG%PBJS7o:yTChC>I{sd^{Gj5F<OvqGT/x<<nyz!0i(00xdSsO2InR
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-<Bu^bsPONZlpsp4i5SSLg^KbUk@Hy%0@@r308!.5v/MGe1Ev=lh#&{U
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+Z$.?f+O(WLGGusCX&PG>[rsKPN5&s=Awd:dsWX=DxCkcu?IeDj:5%BZ/j+fvAaCTTvJ1>l{
+dAjEsJ$[aj:Ot3Q?>-pgNxsmT7t)6r<-rpXf7vinEyO>QUXBeuwEwjzL&}yOrOw6Q>ezh?$
+VF&-]npg6giDMi/x}!uXsbctS&VaO]98RT+%Vn38q)mwOxClAjSeu@++t[1s9e7lTbQ{l(F
+P{N#?i6+XygES#Ki5i&XgbQ:NlnZU30@@r308!.(}V3P@1JR#>Y8R*h
 ------ END PCP PUBLICKEY ------