192 lines
6.0 KiB
Groff
Executable File
192 lines
6.0 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "DH_GENERATE_KEY 3"
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.TH DH_GENERATE_KEY 3 "2020-03-02" "3.0.0-dev" "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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DH_generate_key, DH_compute_key \- perform Diffie\-Hellman key exchange
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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/dh.h>
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.Ve
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.PP
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Deprecated since OpenSSL 3.0, can be hidden entirely by defining
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\&\fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value, see
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\&\fIopenssl_user_macros\fR\|(7):
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.PP
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.Vb 1
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\& int DH_generate_key(DH *dh);
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\&
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\& int DH_compute_key(unsigned char *key, BIGNUM *pub_key, DH *dh);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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Both of the functions described on this page are deprecated.
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Applications should instead use \fIEVP_PKEY_derive_init\fR\|(3)
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and \fIEVP_PKEY_derive\fR\|(3).
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.PP
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\&\fIDH_generate_key()\fR performs the first step of a Diffie-Hellman key
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exchange by generating private and public \s-1DH\s0 values. By calling
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\&\fIDH_compute_key()\fR, these are combined with the other party's public
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value to compute the shared key.
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.PP
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\&\fIDH_generate_key()\fR expects \fBdh\fR to contain the shared parameters
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\&\fBdh\->p\fR and \fBdh\->g\fR. It generates a random private \s-1DH\s0 value
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unless \fBdh\->priv_key\fR is already set, and computes the
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corresponding public value \fBdh\->pub_key\fR, which can then be
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published.
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.PP
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\&\fIDH_compute_key()\fR computes the shared secret from the private \s-1DH\s0 value
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in \fBdh\fR and the other party's public value in \fBpub_key\fR and stores
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it in \fBkey\fR. \fBkey\fR must point to \fBDH_size(dh)\fR bytes of memory.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIDH_generate_key()\fR returns 1 on success, 0 otherwise.
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.PP
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\&\fIDH_compute_key()\fR returns the size of the shared secret on success, \-1
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on error.
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.PP
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The error codes can be obtained by \fIERR_get_error\fR\|(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIEVP_PKEY_derive\fR\|(3),
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\&\fIDH_new\fR\|(3), \fIERR_get_error\fR\|(3), \fIRAND_bytes\fR\|(3), \fIDH_size\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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Both of these functions were deprecated in OpenSSL 3.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2000\-2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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