Update files for OpenSSL-1.0.0f import.
[dragonfly.git] / secure / lib / libcrypto / man / evp.3
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124.\" ========================================================================
125.\"
126.IX Title "evp 3"
e3261593 127.TH evp 3 "2012-01-04" "1.0.0f" "OpenSSL"
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128.\" For nroff, turn off justification. Always turn off hyphenation; it makes
129.\" way too many mistakes in technical documents.
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131.nh
984263bc 132.SH "NAME"
8b0cefbb 133evp \- high\-level cryptographic functions
984263bc 134.SH "SYNOPSIS"
8b0cefbb 135.IX Header "SYNOPSIS"
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136.Vb 1
137\& #include <openssl/evp.h>
138.Ve
139.SH "DESCRIPTION"
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140.IX Header "DESCRIPTION"
141The \s-1EVP\s0 library provides a high-level interface to cryptographic
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142functions.
143.PP
8b0cefbb 144\&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption
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145and decryption to implement digital \*(L"envelopes\*(R".
146.PP
147The \fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions implement
148digital signatures.
149.PP
150Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
151functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
152.PP
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153The \fB\s-1EVP_PKEY\s0\fR\fI...\fR functions provide a high level interface to
154asymmetric algorithms.
155.PP
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156Algorithms are loaded with \fIOpenSSL_add_all_algorithms\fR\|(3).
157.PP
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158All the symmetric algorithms (ciphers), digests and asymmetric algorithms
159(public key algorithms) can be replaced by \s-1ENGINE\s0 modules providing alternative
160implementations. If \s-1ENGINE\s0 implementations of ciphers or digests are registered
161as defaults, then the various \s-1EVP\s0 functions will automatically use those
162implementations automatically in preference to built in software
163implementations. For more information, consult the \fIengine\fR\|(3) man page.
164.PP
165Although low level algorithm specific functions exist for many algorithms
166their use is discouraged. They cannot be used with an \s-1ENGINE\s0 and \s-1ENGINE\s0
167versions of new algorithms cannot be accessed using the low level functions.
168Also makes code harder to adapt to new algorithms and some options are not
169cleanly supported at the low level and some operations are more efficient
170using the high level interface.
984263bc 171.SH "SEE ALSO"
74dab6c2 172.IX Header "SEE ALSO"
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173\&\fIEVP_DigestInit\fR\|(3),
174\&\fIEVP_EncryptInit\fR\|(3),
175\&\fIEVP_OpenInit\fR\|(3),
176\&\fIEVP_SealInit\fR\|(3),
177\&\fIEVP_SignInit\fR\|(3),
178\&\fIEVP_VerifyInit\fR\|(3),
179\&\fIOpenSSL_add_all_algorithms\fR\|(3),
180\&\fIengine\fR\|(3)