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.
225 lines
6.6 KiB
Groff
225 lines
6.6 KiB
Groff
.\" $NetBSD: BN_mod_mul_reciprocal.3,v 1.12 2003/07/24 14:16:37 itojun Exp $
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.\" ======================================================================
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.\"
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.IX Title "BN_mod_mul_reciprocal 3"
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.TH BN_mod_mul_reciprocal 3 "0.9.7b" "2002-09-25" "OpenSSL"
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.UC
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.SH "NAME"
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BN_mod_mul_reciprocal, BN_div_recp, BN_RECP_CTX_new, BN_RECP_CTX_init,
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BN_RECP_CTX_free, BN_RECP_CTX_set \- modular multiplication using
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reciprocal
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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/bn.h>
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.Ve
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.Vb 3
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\& BN_RECP_CTX *BN_RECP_CTX_new(void);
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\& void BN_RECP_CTX_init(BN_RECP_CTX *recp);
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\& void BN_RECP_CTX_free(BN_RECP_CTX *recp);
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.Ve
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.Vb 1
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\& int BN_RECP_CTX_set(BN_RECP_CTX *recp, const BIGNUM *m, BN_CTX *ctx);
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.Ve
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.Vb 2
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\& int BN_div_recp(BIGNUM *dv, BIGNUM *rem, BIGNUM *a, BN_RECP_CTX *recp,
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\& BN_CTX *ctx);
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.Ve
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.Vb 2
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\& int BN_mod_mul_reciprocal(BIGNUM *r, BIGNUM *a, BIGNUM *b,
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\& BN_RECP_CTX *recp, BN_CTX *ctx);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\fIBN_mod_mul_reciprocal()\fR can be used to perform an efficient
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BN_mod_mul(3) operation when the operation will be performed
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repeatedly with the same modulus. It computes \fBr\fR=(\fBa\fR*\fBb\fR)%\fBm\fR
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using \fBrecp\fR=1/\fBm\fR, which is set as described below. \fBctx\fR is a
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previously allocated \fB\s-1BN_CTX\s0\fR used for temporary variables.
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.PP
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\&\fIBN_RECP_CTX_new()\fR allocates and initializes a \fB\s-1BN_RECP\s0\fR structure.
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\&\fIBN_RECP_CTX_init()\fR initializes an existing uninitialized \fB\s-1BN_RECP\s0\fR.
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.PP
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\&\fIBN_RECP_CTX_free()\fR frees the components of the \fB\s-1BN_RECP\s0\fR, and, if it
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was created by \fIBN_RECP_CTX_new()\fR, also the structure itself.
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.PP
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\&\fIBN_RECP_CTX_set()\fR stores \fBm\fR in \fBrecp\fR and sets it up for computing
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1/\fBm\fR and shifting it left by BN_num_bits(\fBm\fR)+1 to make it an
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integer. The result and the number of bits it was shifted left will
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later be stored in \fBrecp\fR.
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.PP
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\&\fIBN_div_recp()\fR divides \fBa\fR by \fBm\fR using \fBrecp\fR. It places the quotient
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in \fBdv\fR and the remainder in \fBrem\fR.
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.PP
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The \fB\s-1BN_RECP_CTX\s0\fR structure is defined as follows:
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.PP
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.Vb 8
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\& typedef struct bn_recp_ctx_st
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\& {
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\& BIGNUM N; /* the divisor */
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\& BIGNUM Nr; /* the reciprocal */
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\& int num_bits;
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\& int shift;
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\& int flags;
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\& } BN_RECP_CTX;
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.Ve
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It cannot be shared between threads.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_RECP_CTX_new()\fR returns the newly allocated \fB\s-1BN_RECP_CTX\s0\fR, and \s-1NULL\s0
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on error.
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.PP
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\&\fIBN_RECP_CTX_init()\fR and \fIBN_RECP_CTX_free()\fR have no return values.
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.PP
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For the other functions, 1 is returned for success, 0 on error.
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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_bn(3), ERR_get_error(3), BN_add(3),
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BN_CTX_new(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fB\s-1BN_RECP_CTX\s0\fR was added in SSLeay 0.9.0. Before that, the function
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\&\fIBN_reciprocal()\fR was used instead, and the \fIBN_mod_mul_reciprocal()\fR
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arguments were different.
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