f4401cd869
alter des.h to be friendly with openssl/des.h (you can include both in the same file) make libkrb to depend on libdes. bump major. massage various portioin of heimdal to be friendly with openssl 0.9.7b.
191 lines
5.4 KiB
Groff
191 lines
5.4 KiB
Groff
.\" $NetBSD: DH_generate_key.3,v 1.12 2003/07/24 14:16:38 itojun Exp $
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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 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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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 "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/dh.h>
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.Ve
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.Vb 1
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\& int DH_generate_key(DH *dh);
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.Ve
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.Vb 1
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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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\&\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 ERR_get_error(3).
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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openssl_dh(3), ERR_get_error(3), openssl_rand(3), DH_size(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIDH_generate_key()\fR and \fIDH_compute_key()\fR are available in all versions
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of SSLeay and OpenSSL.
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