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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.
-
-L<B<EVP_Seal>I<...>|EVP_SealInit(3)> and L<B<EVP_Open>I<...>|EVP_OpenInit(3)>
-provide public key encryption and decryption to implement digital "envelopes".
-
-The L<B<EVP_DigestSign>I<...>|EVP_DigestSignInit(3)> and
-L<B<EVP_DigestVerify>I<...>|EVP_DigestVerifyInit(3)> functions implement
-digital signatures and Message Authentication Codes (MACs). Also see the older
-L<B<EVP_Sign>I<...>|EVP_SignInit(3)> and L<B<EVP_Verify>I<...>|EVP_VerifyInit(3)>
-functions.
-
-Symmetric encryption is available with the L<B<EVP_Encrypt>I<...>|EVP_EncryptInit(3)>
-functions.  The L<B<EVP_Digest>I<...>|EVP_DigestInit(3)> functions provide message digests.
-
-Authenticated encryption with additional data (AEAD) is available with
-the L<B<EVP_AEAD>I<...>|EVP_AEAD_CTX_init(3)> functions.
-
-The B<EVP_PKEY>I<...> functions provide a high level interface to
-asymmetric algorithms. To create a new EVP_PKEY see
-L<EVP_PKEY_new(3)|EVP_PKEY_new(3)>. EVP_PKEYs can be associated
-with a private key of a particular algorithm by using the functions
-described on the L<EVP_PKEY_set1_RSA(3)|EVP_PKEY_set1_RSA(3)> page, or
-new keys can be generated using L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>.
-EVP_PKEYs can be compared using L<EVP_PKEY_cmp(3)|EVP_PKEY_cmp(3)>, or printed using
-L<EVP_PKEY_print_private(3)|EVP_PKEY_print_private(3)>.
-
-The EVP_PKEY functions support the full range of asymmetric algorithm operations:
-
-=over
-
-=item For key agreement see L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>
-
-=item For signing and verifying see L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
-L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)> and L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>.
-However, note that
-these functions do not perform a digest of the data to be signed. Therefore
-normally you would use the L<B<EVP_DigestSign>I<...>|EVP_DigestSignInit(3)>
-functions for this purpose.
-
-=item For encryption and decryption see L<EVP_PKEY_encrypt(3)|EVP_PKEY_encrypt(3)>
-and L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)> respectively. However, note that
-these functions perform encryption and decryption only. As public key
-encryption is an expensive operation, normally you would wrap
-an encrypted message in a "digital envelope" using the L<B<EVP_Seal>I<...>|EVP_SealInit(3)> and
-L<B<EVP_Open>I<...>|EVP_OpenInit(3)> functions.
-
-=back
-
-The L<EVP_BytesToKey(3)|EVP_BytesToKey(3)> function provides some limited support for password
-based encryption. Careful selection of the parameters will provide a PKCS#5 PBKDF1 compatible
-implementation. However, new applications should not typically use this (preferring, for example,
-PBKDF2 from PCKS#5).
-
-Algorithms are loaded with L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>.
-
-All the symmetric algorithms (ciphers), digests and asymmetric algorithms
-(public key algorithms) can be replaced by L<ENGINE|engine(3)> 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_AEAD_CTX_init(3)|EVP_AEAD_CTX_init(3)>,
-L<EVP_OpenInit(3)|EVP_OpenInit(3)>,
-L<EVP_SealInit(3)|EVP_SealInit(3)>,
-L<EVP_DigestSignInit(3)|EVP_DigestSignInit(3)>,
-L<EVP_SignInit(3)|EVP_SignInit(3)>,
-L<EVP_VerifyInit(3)|EVP_VerifyInit(3)>,
-L<EVP_PKEY_new(3)|EVP_PKEY_new(3)>,
-L<EVP_PKEY_set1_RSA(3)|EVP_PKEY_set1_RSA(3)>,
-L<EVP_PKEY_keygen(3)|EVP_PKEY_keygen(3)>,
-L<EVP_PKEY_print_private(3)|EVP_PKEY_print_private(3)>,
-L<EVP_PKEY_decrypt(3)|EVP_PKEY_decrypt(3)>,
-L<EVP_PKEY_encrypt(3)|EVP_PKEY_encrypt(3)>,
-L<EVP_PKEY_sign(3)|EVP_PKEY_sign(3)>,
-L<EVP_PKEY_verify(3)|EVP_PKEY_verify(3)>,
-L<EVP_PKEY_verify_recover(3)|EVP_PKEY_verify_recover(3)>,
-L<EVP_PKEY_derive(3)|EVP_PKEY_derive(3)>,
-L<EVP_BytesToKey(3)|EVP_BytesToKey(3)>,
-L<OpenSSL_add_all_algorithms(3)|OpenSSL_add_all_algorithms(3)>,
-L<engine(3)|engine(3)>
-
-=cut