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134 .TH EVP 7ossl "2023-09-19" "3.0.11" "OpenSSL"
140 evp \- high\-level cryptographic functions
148 The \s-1EVP\s0 library provides a high-level interface to cryptographic
151 The \fBEVP_Seal\fR\fI\s-1XXX\s0\fR and \fBEVP_Open\fR\fI\s-1XXX\s0\fR
154 The \fBEVP_DigestSign\fR\fI\s-1XXX\s0\fR and
155 \&\fBEVP_DigestVerify\fR\fI\s-1XXX\s0\fR functions implement
157 \&\fBEVP_Sign\fR\fI\s-1XXX\s0\fR and \fBEVP_Verify\fR\fI\s-1XXX\s0\fR
160 Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI\s-1XXX\s0\fR
161 functions.  The \fBEVP_Digest\fR\fI\s-1XXX\s0\fR functions provide message digests.
163 The \fB\s-1EVP_PKEY\s0\fR\fI\s-1XXX\s0\fR functions provide a high-level interface to
164 asymmetric algorithms. To create a new \s-1EVP_PKEY\s0 see
171 key back into an \s-1\fBOSSL_PARAM\s0\fR\|(3) array.
173 The \s-1EVP_PKEY\s0 functions support the full range of asymmetric algorithm operations:
185 based encryption. Careful selection of the parameters will provide a PKCS#5 \s-1PBKDF1\s0 compatible
187 \&\s-1PBKDF2\s0 from PCKS#5).
189 The \fBEVP_Encode\fR\fI\s-1XXX\s0\fR and
190 \&\fBEVP_Decode\fR\fI\s-1XXX\s0\fR functions implement base 64 encoding
194 (public key algorithms) can be replaced by \s-1ENGINE\s0 modules providing alternative
195 implementations. If \s-1ENGINE\s0 implementations of ciphers or digests are registered
196 as defaults, then the various \s-1EVP\s0 functions will automatically use those
200 Although low-level algorithm specific functions exist for many algorithms
201 their use is discouraged. They cannot be used with an \s-1ENGINE\s0 and \s-1ENGINE\s0
202 versions of new algorithms cannot be accessed using the low-level functions.
204 cleanly supported at the low-level and some operations are more efficient
205 using the high-level interface.
231 Copyright 2000\-2021 The OpenSSL Project Authors. All Rights Reserved.
235 in the file \s-1LICENSE\s0 in the source distribution or at