Edit File: BN_sub_word.3
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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_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word \- arithmetic functions on BIGNUMs with integers .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& int BN_add_word(BIGNUM *a, BN_ULONG w); \& \& int BN_sub_word(BIGNUM *a, BN_ULONG w); \& \& int BN_mul_word(BIGNUM *a, BN_ULONG w); \& \& BN_ULONG BN_div_word(BIGNUM *a, BN_ULONG w); \& \& BN_ULONG BN_mod_word(const BIGNUM *a, BN_ULONG w); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions perform arithmetic operations on BIGNUMs with unsigned integers. They are much more efficient than the normal \s-1BIGNUM\s0 arithmetic operations. .PP \&\fBBN_add_word()\fR adds \fBw\fR to \fBa\fR (\f(CW\*(C`a+=w\*(C'\fR). .PP \&\fBBN_sub_word()\fR subtracts \fBw\fR from \fBa\fR (\f(CW\*(C`a\-=w\*(C'\fR). .PP \&\fBBN_mul_word()\fR multiplies \fBa\fR and \fBw\fR (\f(CW\*(C`a*=w\*(C'\fR). .PP \&\fBBN_div_word()\fR divides \fBa\fR by \fBw\fR (\f(CW\*(C`a/=w\*(C'\fR) and returns the remainder. .PP \&\fBBN_mod_word()\fR returns the remainder of \fBa\fR divided by \fBw\fR (\f(CW\*(C`a%w\*(C'\fR). .PP For \fBBN_div_word()\fR and \fBBN_mod_word()\fR, \fBw\fR must not be 0. .SH "RETURN VALUES" .IX Header "RETURN VALUES" \&\fBBN_add_word()\fR, \fBBN_sub_word()\fR and \fBBN_mul_word()\fR return 1 for success, 0 on error. The error codes can be obtained by \fBERR_get_error\fR\|(3). .PP \&\fBBN_mod_word()\fR and \fBBN_div_word()\fR return \fBa\fR%\fBw\fR on success and \&\fB(\s-1BN_ULONG\s0)\-1\fR if an error occurred. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBbn\fR\|(3), \fBERR_get_error\fR\|(3), \fBBN_add\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBBN_add_word()\fR and \fBBN_mod_word()\fR are available in all versions of SSLeay and OpenSSL. \fBBN_div_word()\fR was added in SSLeay 0.8, and \&\fBBN_sub_word()\fR and \fBBN_mul_word()\fR in SSLeay 0.9.0. .PP Before 0.9.8a the return value for \fBBN_div_word()\fR and \fBBN_mod_word()\fR in case of an error was 0.