fixed key generation, now the ed25519 key is derived from a seed

and the curve25519 key is derived from the ed25519 key. the encrypted
part now contains the ed25519 secret.

tests/bart.pub

@@ -1,36 +1,36 @@
 ----- BEGIN PCP PUBLIC KEY -----
-  Generated by: Pretty Curved Privacy Version 0.1.2
+  Generated by: Pretty Curved Privacy Version 0.1.3
         Cipher: CURVE25519-ED25519-SALSA20-POLY1305
          Owner: Bart
           Mail: bart@local
-        Key-ID: 0x955C5AF3D4BABB18
-    Public-Key: 1k2a5(H12:G5bm[.R[Ca^8T[1N%P!9Sqo2M6XGa9wb(Pf
- Creation Time: 2013-11-08T12:21:02
-      Checksum: 05:D9:A2:09:C1:E8:9F:79:ED:85:C2:45:E4:81:E2:C4
-                BA:91:B5:22:2A:6D:20:4A:F8:82:98:3A:F0:5E:B4:CA
- Serial Number: 0xDDE1E3AD
+        Key-ID: 0x6C0EEA95E11E2533
+    Public-Key: 1kz.R2FXS+})++h8W3<NvR734vWVtWLxd?GlkoqHf8$$L
+ Creation Time: 2013-11-10T14:24:46
+      Checksum: AE:31:87:4F:77:52:B4:B5:1C:9E:DD:F5:94:7B:4A:B1
+                06:39:8F:10:DA:C0:32:B6:D0:D5:35:69:BE:F5:37:B2
+ Serial Number: 0x9273DE28
    Key Version: 0x00000002
  Random Art ID: +----------------+
                 |                |
                 |                |
                 |                |
-                |       o        |
-                |      . o       |
-                |     . .        |
-                |    o.oo        |
-                |   o+B*.o       |
+                |                |
+                |        .    o .|
+                |         o  . = |
+                |        . .  = o|
+                |           .+o*+|
                 +----------------+
 
-1k2a5(H12:G5bm[.R[Ca^8T[1N%P!9Sqo2M6XGa9wtpO9d/o}%adp*siueSCw4!g!8J-H*X
-1mqSnSCUyc{?u.Bo3EeyH$VMJnEI(Pe5-MYVA[r[CL>[s0MBTQR1(Z?-TFjMV4W%7]:n+bI
-^=Wb]NgZX995XE/oe@KICx!ujUrKk9zcOkq&yXkjYHo!x(<.zjH?x:B?qN?AgM[^acU5])f
-zz-A4s70B-awtpMnbd<SVs:bCyme#/5zq.Qf%U!e}x)Au[q+3?I0C3K#!G2*W22)OPm9[oW
-jF:.yuX8joMN<Gjj1=CvR4aN&%vt{2vaokZRPp#u+D%(3E01uc$EyMVAY?3Qx]^AbHeh3Bp
-D0$FoPCxg0{UM5=)2RA8ktEo#^acjG%163^fy0DT+YW/vvQTq0kX$vGvqC}^S.38x{RttX1
-U3]N3Z#&=HUSIG*gGm(zfRgEVS%95yujI<W*[NEXE6M3g{Ix[u/5}m8wjIwKwyW8)A>-PDI
-^PCvBA1ELu7PS(h:gK-$}cR3D8Ytox94?KlL{-yp?yhUI<8{s6+g8QC31hTp6M9W6wm}@O&
-t2OmQ3C@p{[sX%$c).&/u-YdN/wm+N*VM8VanKoonHUqD)$gBANhnzG&A*izju2&#qnS-3O
-^1>/(i=Yr:/p)a7GdIx.2YBi{yN-I3@0Y}oaR1B3+D/*e2f]mo6G]%&V&[0!)FrCw8xwp2r
-{mp&==Ue!dh8N-Uk$iT#g^TF{lnpC1iSGcW08!i^9SMfu0]q?}TPI$un%A4S5n{i%3TQ6C4
-%0Hqoxfb4.Gg^pK0P(DJVVV/6t?<1odt65J=(I:fw}UqFn1jB}hi@pvYr:%r@-j2
+1kz.R2FXS+})++h8W3<NvR734vWVtWLxd?GlkoqHfgoXon]}I3NVDk48zBw6q/&L9y{&-<r
+Pb^{Uav$]6*=tHBo5LS]j[xHL@$s7Uf[v5D<j>LR3ope+k8<3jYfckF&!vrcyn+==/LNQPp
+!/<Z]P^9c^e6k/*M69&fx%bb2l}iLq?)%<tr[i*vgX05kLEFBDvnpo>XgHRQ?p6vsX!+h(r
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+C@-<Y@UHgL}>:!9XXH%KQ6sN.m[&(cRapHUtpok.CFaEcI@kQhtJ3--[cU+XKB!Pr1Pn!jo
+W=w}@pzKx$lOH}$k@*!>f!(9Lh8v2*M&E9^08!r69SMfu0*mSYc<emJ:@X+A>@]LR(/(R4w
+Z)G/o=C2W9Pv7hkPcSZXMc#>J{A^N6u6+Z}Eh$L]t2VI)h=$sZe2W{6eFL+T]FC4
 ------ END PCP PUBLICKEY ------