Copyright © 2001 - 2005 SILC Project SILC Project Website | SILC Toolkit Reference Manual Index

SILC Toolkit Reference Manual
SILC Core Library
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Introduction to SILC RNG
SILC RNG Interface
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SILC PKCS API
SILC PKCS#1 API
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SILC SFTP Library
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SILC Client Library
Using SILC Client Library Tutorial
Arguments for command_reply Client Operation
SilcStatus Error Arguments in command_reply Client Operation
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Client Library Interface Reference
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SILC Math Library
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Function silc_mp_modinv
SYNOPSIS

        void silc_mp_modinv(SilcMPInt *inv, SilcMPInt *a, SilcMPInt *n);

DESCRIPTION

        Find multiplicative inverse using Euclid's extended algorithm.
        Computes inverse such that a * inv mod n = 1, where 0 < a < n.
        Algorithm goes like this:

        g(0) = n    v(0) = 0
        g(1) = a    v(1) = 1

        y = g(i-1) / g(i)
        g(i+1) = g(i-1) - y * g(i) = g(i)-1 mod g(i)
        v(i+1) = v(i-1) - y * v(i)

        do until g(i) = 0, then inverse = v(i-1). If inverse is negative then n,
        is added to inverse making it positive again. (Sometimes the algorithm
        has a variable u defined too and it behaves just like v, except that
        initalize values are swapped (i.e. u(0) = 1, u(1) = 0). However, u is
        not needed by the algorithm so it does not have to be included.)

SILC MP Interface
SilcMPInt
silc_mp_init
silc_mp_uninit
silc_mp_size
silc_mp_sizeinbase
silc_mp_set
silc_mp_set_ui
silc_mp_set_si
silc_mp_set_str
silc_mp_get_ui
silc_mp_get_str
silc_mp_add
silc_mp_add_ui
silc_mp_sub
silc_mp_sub_ui
silc_mp_mul
silc_mp_mul_ui
silc_mp_mul_2exp
silc_mp_sqrt
silc_mp_div
silc_mp_div_ui
silc_mp_div_qr
silc_mp_div_2exp
silc_mp_div_2exp_qr
silc_mp_mod
silc_mp_mod_ui
silc_mp_mod_2exp
silc_mp_pow
silc_mp_pow_ui
silc_mp_pow_mod
silc_mp_pow_mod_ui
silc_mp_modinv
silc_mp_gcd
silc_mp_gcdext
silc_mp_cmp
silc_mp_cmp_si
silc_mp_cmp_ui
silc_mp_mp2bin
silc_mp_mp2bin_noalloc
silc_mp_bin2mp
silc_mp_abs
silc_mp_neg
silc_mp_and
silc_mp_or
silc_mp_xor

Copyright © 2001 - 2005 SILC Project SILC Project Website | SILC Toolkit Reference Manual Index