bugfix in encryption key computing, added new feature: derived public keys

tests/key-alicia-pub

@@ -3,34 +3,34 @@
         Cipher: CURVE25519-ED25519-SALSA20-POLY1305
          Owner: Alicia
           Mail: alicia@local
-        Key-ID: 0xE2942C2B6C96F6CC
-    Public-Key: 1mZ?-e4^0JA&[}#=t1$/&aI<i:eM^bA/uIJ0O.iRBn#pv
- Creation Time: 2013-10-28T18:43:53
-      Checksum: 1D:33:59:F1:B2:2F:21:73:3A:F6:5E:0D:63:47:76:42
-                93:3B:EF:36:D3:20:8E:43:F5:4D:A9:39:9F:09:43:69
- Serial Number: 0x90C7B055
+        Key-ID: 0x44713DD4E010C582
+    Public-Key: 0#17WjFuf7fj](Ij)l%NCBRo:TwopP(6qSXlEzxb0rr91
+ Creation Time: 2013-11-01T15:52:56
+      Checksum: A0:AF:A6:F1:07:9F:90:EE:95:AF:D7:EE:44:7E:E8:A7
+                ED:C0:71:A4:B3:BF:CD:2B:9C:0E:EC:1D:63:0B:14:A5
+ Serial Number: 0x2E2A200A
    Key Version: 0x00000001
  Random Art ID: +----------------+
+                |+.  .  .o       |
+                |oo o o o        |
+                |  o + . .       |
+                | . . .   .      |
+                |  .     o       |
+                |         .      |
                 |                |
                 |                |
-                |        .       |
-                |         o      |
-                |        . .     |
-                |        ....    |
-                |      ..o...= . |
-                |      .+   o.+..|
                 +----------------+
 
-1mZ?-e4^0JA&[}#=t1$/&aI<i:eM^bA/uIJ0O.iRBu%.Sv}/uK[e:!VVu[(jqvxj3QIzoG<
-/@!Wi0UUCA}6NMwWT$%=Om%gAzYhPvNTZ$mm%*l5YCA>s8fWoUI)[[l?@](l[bY3wzfJg8$
-+RsBj5+]c/(!ZwWu-lDPCkCGb.GJM$HLPU@np=ZQTh-1[#RaNGdOWb(]ZY=K]fSdMfU4q)Z
-T7dmxE:Cmst2o73w4RJ*A%?1idZ2&a^:kXsxnrxCXc5zt>n{QOQY{99oj&^!WH%6b&8@r]o
-OLEzsx9t]B1/vjj:SUBt3*enaKb?.>2eZdMKvFLQ?7DeedmCz-0FGzc!t#o)&Tg%:jV$8iH
-Iq.#9vqGT/x<<nyz!0i(0i&$kp^ylwen6]g:ytRVULL%s>UF39qu9sT6xka@S9F&fyO%Vgo
-AtD^cLtsGtT.DiNQ5&dSeOe2Oa:ETxg&Z[fB+I7uU-Z9OstL?nWLq@O&)a+:vtW1NUrt>4(
-ZaW2D^?xt:CzJ=ARPhD2P6AW5t(E@MD?rpY5MlYFhYv*VU7%6bZ>#hU:<Gv5FX0OCR#PiK}
-UMFAiwkJ)laaDw53N>kW2r9nA8y5>OCb!u.i3dQ8NK3.<>A62Jy[^p}rzi:f*R-]cll:p!D
-hB:kv7pVUjpj*-.5Bg8NBT:HpC:nA*X3)]<eSQP)Qgc4fDlOZ$^lPE4]hBx?i9:bjPqucW%
-0096109cnzKomKzJcU^k?C=*@OGUI&18tAgfFq^Wi8!R6ac}Deld[lkk0OYPaf}2{5Arw$e
-Kg$$@/G+8v$i*m)d@U?H5.hN
+0#17WjFuf7fj](Ij)l%NCBRo:TwopP(6qSXlEzxb0ypKov}/uK2Q6/xr-Mq6bH=dy8-biEa
+o$IOLG(OLj{dO?B}Vh)-e0X:73@MH9Z=i&FhqqkV{j>wxmJcC0*vL4O<Q+.q)ty:VOAGbyR
+/3CTX4w{:GavB1[71)Y+O]jo*Fl[k0wyG=rBrVbmSRO3cS/7ZgaC@I8z:iqmr!JQPm3!i#0
+46m2#Gp9537DU[]VwU2cj0FBbXSnsG(v0R>Mj3sOZNR^3k}OXM!N<]}+!SFY>qoT%H6{tZb
+WCdrzhvQK7Cc]Prn5yvZvyo*@3:xd-plZ92qy@XnqMuc#N7EdRWP30RnxhloN6ZMTNGKOaR
+ETo@7vqGT/x<<nyz!0i(05F-mcd)9K><iy/NSYGQ?-sv*4zeW%*<hX}ErwDIo+=6DyWlED0
+5<F%P*cZ0d^3{dA*&DBPG&/(:I3P!t{DA?5jZMIHUs9$+g$yx>]?.C}AEPsc+IVii?J?Tl3
+dZ/BB=?og/UGl-AaP(aSG0VxQ9SQMbbnWW1IMzrX<D9YMxa$@J!V)BS#DQU6PgEP!<<baUG
+7S+q0l2]Zq5t96oB2Gp3/Oli/&<+lBrd4K>{}<bJYekq/as^20FMPcYdrY0BgrvTaThiB$c
+HvxporF*#>>aRm^KrTa#B5oo2uW)@BgRl6kE<bjZgg=EcBl{@>2fFLmGh8)t>BX6q?qucW%
+00961016?#e^3NT/77sIVp)H[P%U=36VHc+)7i+Klv>OpXx.Cyv*-/qUB>>TOr/21J^s(4B
+H<GklM1BcPYtTx*%-jvuJp6a
 ------ END PCP PUBLICKEY ------