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129 .\" ========================================================================
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131 .IX Title "evp 3"
132 .TH evp 3 "2006-11-19" "0.9.8d" "OpenSSL"
133 .SH "NAME"
134 evp \- high\-level cryptographic functions
135 .SH "SYNOPSIS"
136 .IX Header "SYNOPSIS"
137 .Vb 1
138 \& #include <openssl/evp.h>
139 .Ve
140 .SH "DESCRIPTION"
141 .IX Header "DESCRIPTION"
142 The \s-1EVP\s0 library provides a high-level interface to cryptographic
143 functions.
144 .PP
145 \&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption
146 and decryption to implement digital \*(L"envelopes\*(R".
147 .PP
148 The \fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions implement
149 digital signatures.
150 .PP
151 Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
152 functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
153 .PP
154 Algorithms are loaded with \fIOpenSSL_add_all_algorithms\fR\|(3).
155 .PP
156 All the symmetric algorithms (ciphers) and digests can be replaced by \s-1ENGINE\s0
157 modules providing alternative implementations. If \s-1ENGINE\s0 implementations of
158 ciphers or digests are registered as defaults, then the various \s-1EVP\s0 functions
159 will automatically use those implementations automatically in preference to
160 built in software implementations. For more information, consult the \fIengine\fR\|(3)
161 man page.
162 .SH "SEE ALSO"
163 .IX Header "SEE ALSO"
164 \&\fIEVP_DigestInit\fR\|(3),
165 \&\fIEVP_EncryptInit\fR\|(3),
166 \&\fIEVP_OpenInit\fR\|(3),
167 \&\fIEVP_SealInit\fR\|(3),
168 \&\fIEVP_SignInit\fR\|(3),
169 \&\fIEVP_VerifyInit\fR\|(3),
170 \&\fIOpenSSL_add_all_algorithms\fR\|(3),
171 \&\fIengine\fR\|(3)