185 lines
5.6 KiB
Groff
185 lines
5.6 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "BN_add_word 3"
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.TH BN_add_word 3 "2014-10-15" "1.0.1j" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic
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functions on BIGNUMs with integers
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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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\&
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\& int BN_add_word(BIGNUM *a, BN_ULONG w);
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\&
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\& int BN_sub_word(BIGNUM *a, BN_ULONG w);
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\&
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\& int BN_mul_word(BIGNUM *a, BN_ULONG w);
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\&
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\& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w);
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\&
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\& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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These functions perform arithmetic operations on BIGNUMs with unsigned
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integers. They are much more efficient than the normal \s-1BIGNUM\s0
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arithmetic operations.
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.PP
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\&\fIBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR).
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.PP
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\&\fIBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR).
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.PP
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\&\fIBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=w\*(C'\fR).
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.PP
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\&\fIBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder.
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.PP
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\&\fIBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%w\*(C'\fR).
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.PP
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For \fIBN_div_word()\fR and \fIBN_mod_word()\fR, \fBw\fR must not be 0.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fIBN_add_word()\fR, \fIBN_sub_word()\fR and \fIBN_mul_word()\fR return 1 for success, 0
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on error. The error codes can be obtained by \fIERR_get_error\fR\|(3).
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.PP
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\&\fIBN_mod_word()\fR and \fIBN_div_word()\fR return \fBa\fR%\fBw\fR on success and
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\&\fB(\s-1BN_ULONG\s0)\-1\fR if an error occurred.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIbn\fR\|(3), \fIERR_get_error\fR\|(3), \fIBN_add\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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\&\fIBN_add_word()\fR and \fIBN_mod_word()\fR are available in all versions of
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SSLeay and OpenSSL. \fIBN_div_word()\fR was added in SSLeay 0.8, and
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\&\fIBN_sub_word()\fR and \fIBN_mul_word()\fR in SSLeay 0.9.0.
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.PP
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Before 0.9.8a the return value for \fIBN_div_word()\fR and \fIBN_mod_word()\fR
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in case of an error was 0.
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