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openssl/doc/crypto/evp.pod

 =pod
 
 =head1 NAME
 
 evp - high-level cryptographic functions
 
 =head1 SYNOPSIS
 
  #include <openssl/evp.h>
 
 =head1 DESCRIPTION
 
 The EVP library provides a high-level interface to cryptographic
 functions.
 
 B<EVP_Seal>I<...> and B<EVP_Open>I<...> provide public key encryption
 and decryption to implement digital "envelopes".
 
 The B<EVP_Sign>I<...> and B<EVP_Verify>I<...> functions implement
 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
 
 L<EVP_DigestInit(3)|EVP_DigestInit(3)>,
 L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>,
 L<EVP_OpenInit(3)|EVP_OpenInit(3)>,
 L<EVP_SealInit(3)|EVP_SealInit(3)>,
 L<EVP_SignInit(3)|EVP_SignInit(3)>,
 L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>,
 L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>,
 L<engine(3)|engine(3)>
 
 =cut