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evp(3)				    OpenSSL				evp(3)

NAME
       evp - high-level	cryptographic functions

SYNOPSIS
	#include <openssl/evp.h>

DESCRIPTION
       The EVP library provides	a high-level interface to cryptographic
       functions.

       EVP_Seal... and EVP_Open... provide public key encryption and
       decryption to implement digital "envelopes".

       The EVP_Sign... and EVP_Verify... functions implement digital
       signatures.

       Symmetric encryption is available with the EVP_Encrypt...  functions.
       The EVP_Digest... functions provide message digests.

       The EVP_PKEY... functions provide a high	level interface	to asymmetric
       algorithms.

       Algorithms are loaded with OpenSSL_add_all_algorithms(3).

       All the symmetric algorithms (ciphers), digests and asymmetric
       algorithms (public key algorithms) can be replaced by ENGINE modules
       providing alternative implementations. If ENGINE	implementations	of
       ciphers or digests are registered as defaults, then the various EVP
       functions will automatically use	those implementations automatically in
       preference to built in software implementations.	For more information,
       consult the engine(3) man page.

       Although	low level algorithm specific functions exist for many
       algorithms their	use is discouraged. They cannot	be used	with an	ENGINE
       and ENGINE versions of new algorithms cannot be accessed	using the low
       level functions.	 Also makes code harder	to adapt to new	algorithms and
       some options are	not cleanly supported at the low level and some
       operations are more efficient using the high level interface.

SEE ALSO
       EVP_DigestInit(3), EVP_EncryptInit(3), EVP_OpenInit(3),
       EVP_SealInit(3),	EVP_SignInit(3), EVP_VerifyInit(3),
       OpenSSL_add_all_algorithms(3), engine(3)

1.0.1e				  2013-02-11				evp(3)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO

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