in function EVP_OpenInit (crypto/evp/p_open.c -- rev=1.9) "ret" is set
to "0" at the beginning and is changed upon successful completion to
"1".
In contrast the current documentation says at
"http://www.openssl.org/docs/crypto/EVP_OpenInit.html"
EVP_OpenInit() returns -1 on error or an non zero integer (actually the
recovered secret key size) if successful.
This is an especially nasty documentation bug as wrong error-checking
will cause SIGSEGVs by the function EVP_OpenUpdate (zero-dereference of
b=ctx->cipher->block_size;)
(A check for an invalid ctx might be appropriate (hint,hint,...;-)
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