v1.2.112 - kfun - asn_sub

NAME

asn_sub - subtract one arbitrary size number from another

SYNOPSIS

string asn_sub(string a, string b, string m)

DESCRIPTION

Compute a minus b modulo m. The modulus must be larger than zero. Arbitrary size numbers are encoded as strings, most significant byte first. The most significant bit in the first byte, when set, indicates that the number is negative and encoded in two's complement.

ERRORS

An error will result if the modulus is less than or equal to zero.

SEE ALSO

kfun/asn_add, kfun/asn_div, kfun/asn_mod, kfun/asn_mult, kfun/asn_pow