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Linux 2.6 - man page for bn_sub_word (linux section 3SSL)

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BN_add_word(3SSL)			     OpenSSL				BN_add_word(3SSL)

       BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic functions on
       BIGNUMs with integers

	#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);

       These functions perform arithmetic operations on BIGNUMs with unsigned integers. They are
       much more efficient than the normal BIGNUM arithmetic operations.

       BN_add_word() adds w to a ("a+=w").

       BN_sub_word() subtracts w from a ("a-=w").

       BN_mul_word() multiplies a and w ("a*=w").

       BN_div_word() divides a by w ("a/=w") and returns the remainder.

       BN_mod_word() returns the remainder of a divided by w ("a%w").

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

       BN_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).

       BN_mod_word() and BN_div_word() return a%w on success and (BN_ULONG)-1 if an error

       bn(3), ERR_get_error(3), BN_add(3)

       BN_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 BN_sub_word() and BN_mul_word() in SSLeay

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

1.0.0e					    2005-07-25				BN_add_word(3SSL)
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