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Title "BN_add_word 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic functions on BIGNUMs with integers 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 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.

\fIBN_add_word() adds w to a (\*(C`a+=w\*(C').

\fIBN_sub_word() subtracts w from a (\*(C`a-=w\*(C').

\fIBN_mul_word() multiplies a and w (\*(C`a*=w\*(C').

\fIBN_div_word() divides a by w (\*(C`a/=w\*(C') and returns the remainder.

\fIBN_mod_word() returns the remainder of a divided by w (\*(C`a%w\*(C').

For BN_div_word() and BN_mod_word(), w must not be 0.

Header "RETURN VALUES" \fIBN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 on error. The error codes can be obtained by ERR_get_error\|(3).

\fIBN_mod_word() and BN_div_word() return a%w on success and \fB(\s-1BN_ULONG\s0)-1 if an error occurred.

Header "SEE ALSO" \fIbn\|(3), ERR_get_error\|(3), BN_add\|(3) Header "HISTORY" \fIBN_add_word() and BN_mod_word() are available in all versions of SSLeay and OpenSSL. BN_div_word() was added in SSLeay 0.8, and \fIBN_sub_word() and BN_mul_word() in SSLeay 0.9.0.

Before 0.9.8a the return value for BN_div_word() and BN_mod_word() in case of an error was 0.