212 lines
6.4 KiB
Groff
212 lines
6.4 KiB
Groff
.\" $NetBSD: DH_generate_parameters.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_parameters 3"
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.TH DH_generate_parameters 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_parameters, DH_check \- generate and check Diffie-Hellman parameters
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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 2
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\& DH *DH_generate_parameters(int prime_len, int generator,
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\& void (*callback)(int, int, void *), void *cb_arg);
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.Ve
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.Vb 1
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\& int DH_check(DH *dh, int *codes);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIDH_generate_parameters()\fR generates Diffie-Hellman parameters that can
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be shared among a group of users, and returns them in a newly
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allocated \fB\s-1DH\s0\fR structure. The pseudo-random number generator must be
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seeded prior to calling \fIDH_generate_parameters()\fR.
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.PP
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\&\fBprime_len\fR is the length in bits of the safe prime to be generated.
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\&\fBgenerator\fR is a small number > 1, typically 2 or 5.
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.PP
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A callback function may be used to provide feedback about the progress
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of the key generation. If \fBcallback\fR is not \fB\s-1NULL\s0\fR, it will be
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called as described in BN_generate_prime(3) while a random prime
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number is generated, and when a prime has been found, \fBcallback(3,
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0, cb_arg)\fR is called.
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.PP
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\&\fIDH_check()\fR validates Diffie-Hellman parameters. It checks that \fBp\fR is
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a safe prime, and that \fBg\fR is a suitable generator. In the case of an
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error, the bit flags \s-1DH_CHECK_P_NOT_SAFE_PRIME\s0 or
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\&\s-1DH_NOT_SUITABLE_GENERATOR\s0 are set in \fB*codes\fR.
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\&\s-1DH_UNABLE_TO_CHECK_GENERATOR\s0 is set if the generator cannot be
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checked, i.e. it does not equal 2 or 5.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIDH_generate_parameters()\fR returns a pointer to the \s-1DH\s0 structure, or
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\&\s-1NULL\s0 if the parameter generation fails. The error codes can be
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obtained by ERR_get_error(3).
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.PP
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\&\fIDH_check()\fR returns 1 if the check could be performed, 0 otherwise.
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.SH "NOTES"
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.IX Header "NOTES"
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\&\fIDH_generate_parameters()\fR may run for several hours before finding a
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suitable prime.
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.PP
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The parameters generated by \fIDH_generate_parameters()\fR are not to be
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used in signature schemes.
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.SH "BUGS"
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.IX Header "BUGS"
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If \fBgenerator\fR is not 2 or 5, \fBdh->g\fR=\fBgenerator\fR is not
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a usable generator.
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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),
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DH_free(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIDH_check()\fR is available in all versions of SSLeay and OpenSSL.
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The \fBcb_arg\fR argument to \fIDH_generate_parameters()\fR was added in SSLeay 0.9.0.
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.PP
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In versions before OpenSSL 0.9.5, \s-1DH_CHECK_P_NOT_STRONG_PRIME\s0 is used
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instead of \s-1DH_CHECK_P_NOT_SAFE_PRIME\s0.
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