1=pod 2 3=head1 NAME 4 5evp - high-level cryptographic functions 6 7=head1 SYNOPSIS 8 9 #include <openssl/evp.h> 10 11=head1 DESCRIPTION 12 13The EVP library provides a high-level interface to cryptographic 14functions. 15 16B<EVP_Seal>I<...> and B<EVP_Open>I<...> provide public key encryption 17and decryption to implement digital "envelopes". 18 19The B<EVP_Sign>I<...> and B<EVP_Verify>I<...> functions implement 20digital signatures. 21 22Symmetric encryption is available with the B<EVP_Encrypt>I<...> 23functions. The B<EVP_Digest>I<...> functions provide message digests. 24 25Algorithms are loaded with OpenSSL_add_all_algorithms(3). 26 27All the symmetric algorithms (ciphers) and digests can be replaced by ENGINE 28modules providing alternative implementations. If ENGINE implementations of 29ciphers or digests are registered as defaults, then the various EVP functions 30will automatically use those implementations automatically in preference to 31built in software implementations. For more information, consult the engine(3) 32man page. 33 34=head1 SEE ALSO 35 36L<EVP_DigestInit(3)|EVP_DigestInit(3)>, 37L<EVP_EncryptInit(3)|EVP_EncryptInit(3)>, 38L<EVP_OpenInit(3)|EVP_OpenInit(3)>, 39L<EVP_SealInit(3)|EVP_SealInit(3)>, 40L<EVP_SignInit(3)|EVP_SignInit(3)>, 41L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>, 42L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>, 43L<engine(3)|engine(3)> 44 45=cut 46