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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/crypto/BN_add_word.pod | |
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Diffstat (limited to 'openssl/doc/crypto/BN_add_word.pod')
-rw-r--r-- | openssl/doc/crypto/BN_add_word.pod | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/openssl/doc/crypto/BN_add_word.pod b/openssl/doc/crypto/BN_add_word.pod new file mode 100644 index 000000000..70667d289 --- /dev/null +++ b/openssl/doc/crypto/BN_add_word.pod @@ -0,0 +1,61 @@ +=pod + +=head1 NAME + +BN_add_word, BN_sub_word, BN_mul_word, BN_div_word, BN_mod_word - arithmetic +functions on BIGNUMs with integers + +=head1 SYNOPSIS + + #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); + +=head1 DESCRIPTION + +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 B<w> to B<a> (C<a+=w>). + +BN_sub_word() subtracts B<w> from B<a> (C<a-=w>). + +BN_mul_word() multiplies B<a> and B<w> (C<a*=w>). + +BN_div_word() divides B<a> by B<w> (C<a/=w>) and returns the remainder. + +BN_mod_word() returns the remainder of B<a> divided by B<w> (C<a%w>). + +For BN_div_word() and BN_mod_word(), B<w> must not be 0. + +=head1 RETURN VALUES + +BN_add_word(), BN_sub_word() and BN_mul_word() return 1 for success, 0 +on error. The error codes can be obtained by L<ERR_get_error(3)|ERR_get_error(3)>. + +BN_mod_word() and BN_div_word() return B<a>%B<w> on success and +B<(BN_ULONG)-1> if an error occurred. + +=head1 SEE ALSO + +L<bn(3)|bn(3)>, L<ERR_get_error(3)|ERR_get_error(3)>, L<BN_add(3)|BN_add(3)> + +=head1 HISTORY + +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 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. + +=cut |