Index: openssl/doc/crypto/evp.pod |
=================================================================== |
--- openssl/doc/crypto/evp.pod (revision 105093) |
+++ openssl/doc/crypto/evp.pod (working copy) |
@@ -22,15 +22,25 @@ |
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 |
L<EVP_DigestInit(3)|EVP_DigestInit(3)>, |