Parsing of PKCS#8 encrypted private key files added and PKCS#12 basis

PKCS#8 encrypted key file support has been added to x509parse_key() with
support for some PCKS#12 PBE functions (pbeWithSHAAnd128BitRC4,
pbeWithSHAAnd3-KeyTripleDES-CBC and pbeWithSHAAnd2-KeyTripleDES-CBC)

ChangeLog

diff --git a/ChangeLog b/ChangeLog
index 0a4bfb1..37308c1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,10 @@
 PolarSSL ChangeLog
 
 = Branch 1.2
+Features
+   * Parsing of PKCS#8 encrypted private key files
+   * PKCS#12 PBE and derivation functions
+
 Change
    * HAVEGE random generator disabled by default
    * Internally split up x509parse_key() into a (PEM) handler function