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authormarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
committermarha <marha@users.sourceforge.net>2010-03-30 12:36:28 +0000
commitff48c0d9098080b51ea12710029135916d117806 (patch)
tree96e6af9caf170ba21a1027b24e306a07e27d7b75 /openssl/doc/crypto/evp.pod
parentbb731f5ac92655c4860a41fa818a7a63005f8369 (diff)
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svn merge -r514:HEAD ^/branches/released .
Diffstat (limited to 'openssl/doc/crypto/evp.pod')
-rw-r--r--openssl/doc/crypto/evp.pod22
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