0a6a1f1d05
This brings our tree to NetBSD 7.0, as found on -current on the 10-10-2015. This updates: - LLVM to 3.6.1 - GCC to GCC 5.1 - Replace minix/commands/zdump with usr.bin/zdump - external/bsd/libelf has moved to /external/bsd/elftoolchain/ - Import ctwm - Drop sprintf from libminc Change-Id: I149836ac18e9326be9353958bab9b266efb056f0
194 lines
5.9 KiB
Groff
194 lines
5.9 KiB
Groff
.\" $NetBSD: openssl_evp.3,v 1.14 2015/06/12 17:01:15 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "evp 3"
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.TH evp 3 "2009-07-19" "1.0.1n" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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evp \- high\-level cryptographic functions
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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/evp.h>
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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The \s-1EVP\s0 library provides a high-level interface to cryptographic
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functions.
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.PP
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\&\fBEVP_Seal\fR\fI...\fR and \fBEVP_Open\fR\fI...\fR provide public key encryption
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and decryption to implement digital \*(L"envelopes\*(R".
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.PP
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The \fBEVP_Sign\fR\fI...\fR and \fBEVP_Verify\fR\fI...\fR functions implement
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digital signatures.
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.PP
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Symmetric encryption is available with the \fBEVP_Encrypt\fR\fI...\fR
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functions. The \fBEVP_Digest\fR\fI...\fR functions provide message digests.
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.PP
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The \fB\s-1EVP_PKEY\s0\fR\fI...\fR functions provide a high level interface to
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asymmetric algorithms.
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.PP
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Algorithms are loaded with \fIOpenSSL_add_all_algorithms\fR\|(3).
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.PP
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All the symmetric algorithms (ciphers), digests and asymmetric algorithms
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(public key algorithms) can be replaced by \s-1ENGINE\s0 modules providing alternative
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implementations. If \s-1ENGINE\s0 implementations of ciphers or digests are registered
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as defaults, then the various \s-1EVP\s0 functions will automatically use those
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implementations automatically in preference to built in software
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implementations. For more information, consult the \fIengine\fR\|(3) man page.
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.PP
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Although low level algorithm specific functions exist for many algorithms
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their use is discouraged. They cannot be used with an \s-1ENGINE\s0 and \s-1ENGINE\s0
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versions of new algorithms cannot be accessed using the low level functions.
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Also makes code harder to adapt to new algorithms and some options are not
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cleanly supported at the low level and some operations are more efficient
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using the high level interface.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_DigestInit\fR\|(3),
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\&\fIEVP_EncryptInit\fR\|(3),
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\&\fIEVP_OpenInit\fR\|(3),
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\&\fIEVP_SealInit\fR\|(3),
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\&\fIEVP_SignInit\fR\|(3),
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\&\fIEVP_VerifyInit\fR\|(3),
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\&\fIOpenSSL_add_all_algorithms\fR\|(3),
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\&\fIengine\fR\|(3)
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