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Implementing SHA1 hashing is quiet easy on S60 2nd Edition devices.
You will need the SHA1 cpp sources from http://mikie.iki.fi/lxr/source/ContextNetwork/src/SHA1.cpp
Once you have SHA1.h and SHA1.cpp
Just write a function
SHA1 * sha1 = new SHA1;
unsigned int message_digest_array;
for (int i=0;i<5;i++)
Thats it you now have your SHA1'ed password in iShaPass.