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Diffstat (limited to 'secure/lib/libcrypto/man/BN_mod_mul_reciprocal.3')
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diff --git a/secure/lib/libcrypto/man/BN_mod_mul_reciprocal.3 b/secure/lib/libcrypto/man/BN_mod_mul_reciprocal.3 new file mode 100644 index 0000000..9f858bd --- /dev/null +++ b/secure/lib/libcrypto/man/BN_mod_mul_reciprocal.3 @@ -0,0 +1,206 @@ +.\" Automatically generated by Pod::Man 2.25 (Pod::Simple 3.23) +.\" +.\" 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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Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.ie \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.el \{\ +. de IX +.. +.\} +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. 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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_init, +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_init(BN_RECP_CTX *recp); +\& 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" +\&\fIBN_mod_mul_reciprocal()\fR can be used to perform an efficient +\&\fIBN_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 +\&\fIBN_RECP_CTX_new()\fR allocates and initializes a \fB\s-1BN_RECP\s0\fR structure. +\&\fIBN_RECP_CTX_init()\fR initializes an existing uninitialized \fB\s-1BN_RECP\s0\fR. +.PP +\&\fIBN_RECP_CTX_free()\fR frees the components of the \fB\s-1BN_RECP\s0\fR, and, if it +was created by \fIBN_RECP_CTX_new()\fR, also the structure itself. +.PP +\&\fIBN_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 +\&\fIBN_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 is defined as follows: +.PP +.Vb 8 +\& typedef struct bn_recp_ctx_st +\& { +\& BIGNUM N; /* the divisor */ +\& BIGNUM Nr; /* the reciprocal */ +\& int num_bits; +\& int shift; +\& int flags; +\& } BN_RECP_CTX; +.Ve +.PP +It cannot be shared between threads. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\fIBN_RECP_CTX_new()\fR returns the newly allocated \fB\s-1BN_RECP_CTX\s0\fR, and \s-1NULL\s0 +on error. +.PP +\&\fIBN_RECP_CTX_init()\fR and \fIBN_RECP_CTX_free()\fR have no return values. +.PP +For the other functions, 1 is returned for success, 0 on error. +The error codes can be obtained by \fIERR_get_error\fR\|(3). +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3), +\&\fIBN_CTX_new\fR\|(3) +.SH "HISTORY" +.IX Header "HISTORY" +\&\fB\s-1BN_RECP_CTX\s0\fR was added in SSLeay 0.9.0. Before that, the function +\&\fIBN_reciprocal()\fR was used instead, and the \fIBN_mod_mul_reciprocal()\fR +arguments were different. |