In message <49ae12ec.5030...@gmail.com> on Wed, 04 Mar 2009 13:34:36 +0800, xh
<xiangshu...@gmail.com> said:
xiangshu129> Hi everyone,
xiangshu129>
xiangshu129> what's the difference between the following two command?
xiangshu129> openssl speed md5
xiangshu129> openssl speed -evp md5
xiangshu129>
xiangshu129> I checked the speed.c file, the -evp will call:
xiangshu129>
xiangshu129> EVP_CIPHER_CTX_init
xiangshu129> EVP_EncryptInit_ex
xiangshu129> EVP_EncryptUpdate
xiangshu129> EVP_EncryptFinal_ex
It will do so for cipher algorithms, but for hash algorithms such as
md5, it will call EVP_Digest() (all depending on the values of
evp_cipher and evp_md).
xiangshu129> but the openssl speed md5 will call
xiangshu129> EVP_Digest
xiangshu129>
xiangshu129> I think the two methods both use the EVP api, there seems no
xiangshu129> difference.
xiangshu129>
xiangshu129> If anything wrong, please correct me.
For hash algorithms, the difference is none, that's correct. For
cipher algorithms, though, there's a difference. Without -evp, the
algorithm's lowest level functions will be called directly (provided
speed knows about the request algorithm specifically), while with
-evp, the EVP routines that you identified above will be called
instead.
Cheers,
Richard
--
Richard Levitte rich...@levitte.org
http://richard.levitte.org/
"Life is a tremendous celebration - and I'm invited!"
-- from a friend's blog, translated from Swedish
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