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135 .TH evp 3 "2009-04-11" "0.9.8k" "OpenSSL"
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141 evp \- high\-level cryptographic functions
143 .IX Header "SYNOPSIS"
145 \& #include <openssl/evp.h>
148 .IX Header "DESCRIPTION"
149 The \s-1EVP\s0 library provides a high-level interface to cryptographic
152 \&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption
153 and decryption to implement digital \*(L"envelopes\*(R".
155 The \fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions implement
158 Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
159 functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
161 Algorithms are loaded with \fIOpenSSL_add_all_algorithms\fR\|(3).
163 All the symmetric algorithms (ciphers) and digests can be replaced by \s-1ENGINE\s0
164 modules providing alternative implementations. If \s-1ENGINE\s0 implementations of
165 ciphers or digests are registered as defaults, then the various \s-1EVP\s0 functions
166 will automatically use those implementations automatically in preference to
167 built in software implementations. For more information, consult the \fIengine\fR\|(3)
170 .IX Header "SEE ALSO"
171 \&\fIEVP_DigestInit\fR\|(3),
172 \&\fIEVP_EncryptInit\fR\|(3),
173 \&\fIEVP_OpenInit\fR\|(3),
174 \&\fIEVP_SealInit\fR\|(3),
175 \&\fIEVP_SignInit\fR\|(3),
176 \&\fIEVP_VerifyInit\fR\|(3),
177 \&\fIOpenSSL_add_all_algorithms\fR\|(3),