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Edit File : BN_RECP_CTX_new.3 \| Size : 6.53 KB
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .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. \(C+ will .\" give a nicer C++. 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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_mod_mul_reciprocal, BN_div_recp, BN_RECP_CTX_new, BN_RECP_CTX_free, BN_RECP_CTX_set \- modular multiplication using reciprocal .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& BN_RECP_CTX BN_RECP_CTX_new(void); \& void BN_RECP_CTX_free(BN_RECP_CTX recp); \& \& int BN_RECP_CTX_set(BN_RECP_CTX recp, const BIGNUM m, BN_CTX ctx); \& \& int BN_div_recp(BIGNUM dv, BIGNUM rem, BIGNUM a, BN_RECP_CTX recp, \& BN_CTX ctx); \& \& int BN_mod_mul_reciprocal(BIGNUM r, BIGNUM a, BIGNUM b, \& BN_RECP_CTX recp, BN_CTX ctx); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fBBN_mod_mul_reciprocal()\fR can be used to perform an efficient \&\fBBN_mod_mul\fR\\|(3) operation when the operation will be performed repeatedly with the same modulus. It computes \fBr\fR=(\fBa\fR\fBb\fR)%\fBm\fR using \fBrecp\fR=1/\fBm\fR, which is set as described below. \fBctx\fR is a previously allocated \fB\s-1BN_CTX\s0\fR used for temporary variables. .PP \&\fBBN_RECP_CTX_new()\fR allocates and initializes a \fB\s-1BN_RECP\s0\fR structure. .PP \&\fBBN_RECP_CTX_free()\fR frees the components of the \fB\s-1BN_RECP\s0\fR, and, if it was created by \fBBN_RECP_CTX_new()\fR, also the structure itself. If \fBrecp\fR is \s-1NULL,\s0 nothing is done. .PP \&\fBBN_RECP_CTX_set()\fR stores \fBm\fR in \fBrecp\fR and sets it up for computing 1/\fBm\fR and shifting it left by BN_num_bits(\fBm\fR)+1 to make it an integer. The result and the number of bits it was shifted left will later be stored in \fBrecp\fR. .PP \&\fBBN_div_recp()\fR divides \fBa\fR by \fBm\fR using \fBrecp\fR. It places the quotient in \fBdv\fR and the remainder in \fBrem\fR. .PP The \fB\s-1BN_RECP_CTX\s0\fR structure cannot be shared between threads. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_RECP_CTX_new()\fR returns the newly allocated \fB\s-1BN_RECP_CTX\s0\fR, and \s-1NULL\s0 on error. .PP \&\fBBN_RECP_CTX_free()\fR has no return value. .PP For the other functions, 1 is returned for success, 0 on error. The error codes can be obtained by \fBERR_get_error\fR\\|(3). .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBERR_get_error\fR\\|(3), \fBBN_add\fR\\|(3), \&\fBBN_CTX_new\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_RECP_CTX_init()\fR was removed in OpenSSL 1.1.0 .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>. Back

Edit File : BN_RECP_CTX_new.3 | Size : 6.53 KB

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.\" ========================================================================
.\"
.IX Title "BN_MOD_MUL_RECIPROCAL 3"
.TH BN_MOD_MUL_RECIPROCAL 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
BN_mod_mul_reciprocal, BN_div_recp, BN_RECP_CTX_new, BN_RECP_CTX_free, BN_RECP_CTX_set \- modular multiplication using reciprocal
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/bn.h>
\&
\& BN_RECP_CTX *BN_RECP_CTX_new(void);
\& void BN_RECP_CTX_free(BN_RECP_CTX *recp);
\&
\& int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *m, BN_CTX *ctx);
\&
\& int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *a, BN_RECP_CTX *recp,
\&                 BN_CTX *ctx);
\&
\& int BN_mod_mul_reciprocal(BIGNUM *r, BIGNUM *a, BIGNUM *b,
\&                           BN_RECP_CTX *recp, BN_CTX *ctx);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBBN_mod_mul_reciprocal()\fR can be used to perform an efficient
\&\fBBN_mod_mul\fR\|(3) operation when the operation will be performed
repeatedly with the same modulus. It computes \fBr\fR=(\fBa\fR*\fBb\fR)%\fBm\fR
using \fBrecp\fR=1/\fBm\fR, which is set as described below.  \fBctx\fR is a
previously allocated \fB\s-1BN_CTX\s0\fR used for temporary variables.
.PP
\&\fBBN_RECP_CTX_new()\fR allocates and initializes a \fB\s-1BN_RECP\s0\fR structure.
.PP
\&\fBBN_RECP_CTX_free()\fR frees the components of the \fB\s-1BN_RECP\s0\fR, and, if it
was created by \fBBN_RECP_CTX_new()\fR, also the structure itself.
If \fBrecp\fR is \s-1NULL,\s0 nothing is done.
.PP
\&\fBBN_RECP_CTX_set()\fR stores \fBm\fR in \fBrecp\fR and sets it up for computing
1/\fBm\fR and shifting it left by BN_num_bits(\fBm\fR)+1 to make it an
integer. The result and the number of bits it was shifted left will
later be stored in \fBrecp\fR.
.PP
\&\fBBN_div_recp()\fR divides \fBa\fR by \fBm\fR using \fBrecp\fR. It places the quotient
in \fBdv\fR and the remainder in \fBrem\fR.
.PP
The \fB\s-1BN_RECP_CTX\s0\fR structure cannot be shared between threads.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBBN_RECP_CTX_new()\fR returns the newly allocated \fB\s-1BN_RECP_CTX\s0\fR, and \s-1NULL\s0
on error.
.PP
\&\fBBN_RECP_CTX_free()\fR has no return value.
.PP
For the other functions, 1 is returned for success, 0 on error.
The error codes can be obtained by \fBERR_get_error\fR\|(3).
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3),
\&\fBBN_CTX_new\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
\&\fBBN_RECP_CTX_init()\fR was removed in OpenSSL 1.1.0
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2017 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.

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