191 lines
5.4 KiB
Groff
191 lines
5.4 KiB
Groff
.\" $NetBSD: DH_generate_key.3,v 1.10 2002/08/09 16:15:38 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 "0.9.6g" "2000-07-22" "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), openssl_err(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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