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Diffstat (limited to 'secure/lib/libcrypto/man/DH_set_method.3')
| -rw-r--r-- | secure/lib/libcrypto/man/DH_set_method.3 | 276 |
1 files changed, 276 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/DH_set_method.3 b/secure/lib/libcrypto/man/DH_set_method.3 new file mode 100644 index 0000000..c510eb5 --- /dev/null +++ b/secure/lib/libcrypto/man/DH_set_method.3 @@ -0,0 +1,276 @@ +.\" Automatically generated by Pod::Man version 1.15 +.\" Wed Feb 19 16:42:50 2003 +.\" +.\" Standard preamble: +.\" ====================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Ip \" List item +.br +.ie \\n(.$>=3 .ne \\$3 +.el .ne 3 +.IP "\\$1" \\$2 +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R + +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used +.\" to do unbreakable dashes and therefore won't be available. \*(C` and +.\" \*(C' expand to `' in nroff, nothing in troff, for use with C<> +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr +.\" for titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and +.\" index entries marked with X<> in POD. Of course, you'll have to process +.\" the output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it +.\" makes way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. 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By modifying the method, alternative implementations +such as hardware accelerators may be used. \s-1IMPORTANT:\s0 See the \s-1NOTES\s0 section for +important information about how these \s-1DH\s0 \s-1API\s0 functions are affected by the use +of \fB\s-1ENGINE\s0\fR \s-1API\s0 calls. +.PP +Initially, the default \s-1DH_METHOD\s0 is the OpenSSL internal implementation, as +returned by \fIDH_OpenSSL()\fR. +.PP +\&\fIDH_set_default_method()\fR makes \fBmeth\fR the default method for all \s-1DH\s0 +structures created later. \fB\s-1NB\s0\fR: This is true only whilst no \s-1ENGINE\s0 has been set +as a default for \s-1DH\s0, so this function is no longer recommended. +.PP +\&\fIDH_get_default_method()\fR returns a pointer to the current default \s-1DH_METHOD\s0. +However, the meaningfulness of this result is dependant on whether the \s-1ENGINE\s0 +\&\s-1API\s0 is being used, so this function is no longer recommended. +.PP +\&\fIDH_set_method()\fR selects \fBmeth\fR to perform all operations using the key \fBdh\fR. +This will replace the \s-1DH_METHOD\s0 used by the \s-1DH\s0 key and if the previous method +was supplied by an \s-1ENGINE\s0, the handle to that \s-1ENGINE\s0 will be released during the +change. It is possible to have \s-1DH\s0 keys that only work with certain \s-1DH_METHOD\s0 +implementations (eg. from an \s-1ENGINE\s0 module that supports embedded +hardware-protected keys), and in such cases attempting to change the \s-1DH_METHOD\s0 +for the key can have unexpected results. +.PP +\&\fIDH_new_method()\fR allocates and initializes a \s-1DH\s0 structure so that \fBengine\fR will +be used for the \s-1DH\s0 operations. If \fBengine\fR is \s-1NULL\s0, the default \s-1ENGINE\s0 for \s-1DH\s0 +operations is used, and if no default \s-1ENGINE\s0 is set, the \s-1DH_METHOD\s0 controlled by +\&\fIDH_set_default_method()\fR is used. +.SH "THE DH_METHOD STRUCTURE" +.IX Header "THE DH_METHOD STRUCTURE" +.Vb 4 +\& typedef struct dh_meth_st +\& { +\& /* name of the implementation */ +\& const char *name; +.Ve +.Vb 2 +\& /* generate private and public DH values for key agreement */ +\& int (*generate_key)(DH *dh); +.Ve +.Vb 2 +\& /* compute shared secret */ +\& int (*compute_key)(unsigned char *key, BIGNUM *pub_key, DH *dh); +.Ve +.Vb 4 +\& /* compute r = a ^ p mod m (May be NULL for some implementations) */ +\& int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM *a, const BIGNUM *p, +\& const BIGNUM *m, BN_CTX *ctx, +\& BN_MONT_CTX *m_ctx); +.Ve +.Vb 2 +\& /* called at DH_new */ +\& int (*init)(DH *dh); +.Ve +.Vb 2 +\& /* called at DH_free */ +\& int (*finish)(DH *dh); +.Ve +.Vb 1 +\& int flags; +.Ve +.Vb 1 +\& char *app_data; /* ?? */ +.Ve +.Vb 1 +\& } DH_METHOD; +.Ve +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIDH_OpenSSL()\fR and \fIDH_get_default_method()\fR return pointers to the respective +\&\fB\s-1DH_METHOD\s0\fRs. +.PP +\&\fIDH_set_default_method()\fR returns no value. +.PP +\&\fIDH_set_method()\fR returns non-zero if the provided \fBmeth\fR was successfully set as +the method for \fBdh\fR (including unloading the \s-1ENGINE\s0 handle if the previous +method was supplied by an \s-1ENGINE\s0). +.PP +\&\fIDH_new_method()\fR returns \s-1NULL\s0 and sets an error code that can be obtained by +ERR_get_error(3) if the allocation fails. Otherwise it +returns a pointer to the newly allocated structure. +.SH "NOTES" +.IX Header "NOTES" +As of version 0.9.7, \s-1DH_METHOD\s0 implementations are grouped together with other +algorithmic APIs (eg. \s-1RSA_METHOD\s0, \s-1EVP_CIPHER\s0, etc) in \fB\s-1ENGINE\s0\fR modules. If a +default \s-1ENGINE\s0 is specified for \s-1DH\s0 functionality using an \s-1ENGINE\s0 \s-1API\s0 function, +that will override any \s-1DH\s0 defaults set using the \s-1DH\s0 \s-1API\s0 (ie. +\&\fIDH_set_default_method()\fR). For this reason, the \s-1ENGINE\s0 \s-1API\s0 is the recommended way +to control default implementations for use in \s-1DH\s0 and other cryptographic +algorithms. +.SH "SEE ALSO" +.IX Header "SEE ALSO" +dh(3), DH_new(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fIDH_set_default_method()\fR, \fIDH_get_default_method()\fR, \fIDH_set_method()\fR, +\&\fIDH_new_method()\fR and \fIDH_OpenSSL()\fR were added in OpenSSL 0.9.4. +.PP +\&\fIDH_set_default_openssl_method()\fR and \fIDH_get_default_openssl_method()\fR replaced +\&\fIDH_set_default_method()\fR and \fIDH_get_default_method()\fR respectively, and +\&\fIDH_set_method()\fR and \fIDH_new_method()\fR were altered to use \fB\s-1ENGINE\s0\fRs rather than +\&\fB\s-1DH_METHOD\s0\fRs during development of the engine version of OpenSSL 0.9.6. For +0.9.7, the handling of defaults in the \s-1ENGINE\s0 \s-1API\s0 was restructured so that this +change was reversed, and behaviour of the other functions resembled more closely +the previous behaviour. The behaviour of defaults in the \s-1ENGINE\s0 \s-1API\s0 now +transparently overrides the behaviour of defaults in the \s-1DH\s0 \s-1API\s0 without +requiring changing these function prototypes. |
