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Diffstat (limited to 'openssl/doc/crypto/evp.pod')
| -rw-r--r-- | openssl/doc/crypto/evp.pod | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/openssl/doc/crypto/evp.pod b/openssl/doc/crypto/evp.pod index b3ca14314..9faa34924 100644 --- a/openssl/doc/crypto/evp.pod +++ b/openssl/doc/crypto/evp.pod @@ -22,14 +22,24 @@ digital signatures. Symmetric encryption is available with the B<EVP_Encrypt>I<...> functions. The B<EVP_Digest>I<...> functions provide message digests. +The B<EVP_PKEY>I<...> functions provide a high level interface to +asymmetric algorithms. + Algorithms are loaded with OpenSSL_add_all_algorithms(3). -All the symmetric algorithms (ciphers) and digests 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. +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. =head1 SEE ALSO |