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     evp(3)                 5/Aug/2002 (0.9.7e)                 evp(3)


     NAME
          evp - high-level cryptographic functions

     SYNOPSIS
           #include <openssl/evp.h>


     DESCRIPTION
          The EVP library provides a high-level interface to
          cryptographic functions.

          EVP_Seal... and EVP_Open... provide public key encryption
          and decryption to implement digital "envelopes".

          The EVP_Sign... and EVP_Verify... functions implement
          digital signatures.

          Symmetric encryption is available with the EVP_Encrypt...
          functions.  The EVP_Digest... 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.

     SEE ALSO
          EVP_DigestInit(3), EVP_EncryptInit(3), EVP_OpenInit(3),
          EVP_SealInit(3), EVP_SignInit(3), EVP_VerifyInit(3),
          OpenSSL_add_all_algorithms(3), engine(3)


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