[gnutls-dev] Symmetric cipher API

[Sam Varshavchik]

Recently I converted some code that uses OpenSSL's EVP_CIPHER symmetric 
cipher API. I wrote a wrapper that mapped the following functions to their 
gcrypt equivalents: EVP_CIPHER_CTX_init(), EVP_CIPHER_CTX_cleanup(), 
EVP_(Encrypt|Decrypt)Init_ex(), EVP_(Encrypt|Decrypt)Update(), and 
EVP_(Encrypt|Decrypt)Final_ex().

If you are interested, I'll be happy to contribute this code. I also thought 
that it's better to make this a native libgcrypt API. This should be only a 
matter of renaming the function names and arguments to follow libgcrypt's 
naming conventions, and all the EVP function become now just some 
lightweight wrappers (or probably even macros).

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