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127 .TH evp 3 "2007-10-24" "0.9.8g" "OpenSSL"
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133 evp \- high\-level cryptographic functions
135 .IX Header "SYNOPSIS"
137 \& #include <openssl/evp.h>
140 .IX Header "DESCRIPTION"
141 The \s-1EVP\s0 library provides a high-level interface to cryptographic
144 \&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption
145 and decryption to implement digital \*(L"envelopes\*(R".
147 The \fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions implement
150 Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
151 functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
153 Algorithms are loaded with \fIOpenSSL_add_all_algorithms\fR\|(3).
155 All the symmetric algorithms (ciphers) and digests can be replaced by \s-1ENGINE\s0
156 modules providing alternative implementations. If \s-1ENGINE\s0 implementations of
157 ciphers or digests are registered as defaults, then the various \s-1EVP\s0 functions
158 will automatically use those implementations automatically in preference to
159 built in software implementations. For more information, consult the \fIengine\fR\|(3)
162 .IX Header "SEE ALSO"
163 \&\fIEVP_DigestInit\fR\|(3),
164 \&\fIEVP_EncryptInit\fR\|(3),
165 \&\fIEVP_OpenInit\fR\|(3),
166 \&\fIEVP_SealInit\fR\|(3),
167 \&\fIEVP_SignInit\fR\|(3),
168 \&\fIEVP_VerifyInit\fR\|(3),
169 \&\fIOpenSSL_add_all_algorithms\fR\|(3),