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=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. 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. =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