Mercurial > dropbear
diff libtommath/bn_mp_exteuclid.c @ 1655:f52919ffd3b1
update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
* make key-generation compliant to FIPS 186.4
* fix includes in tommath_class.h
* update fuzzcorpus instead of error-out
* fixup fuzzing make-targets
* update Makefile.in
* apply necessary patches to ltm sources
* clean-up not required ltm files
* update to vanilla ltm 1.1.0
this already only contains the required files
* remove set/get double
| author | Steffen Jaeckel <s_jaeckel@gmx.de> |
|---|---|
| date | Mon, 16 Sep 2019 15:50:38 +0200 |
| parents | 8bba51a55704 |
| children | 1051e4eea25a |
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--- a/libtommath/bn_mp_exteuclid.c Wed May 15 21:59:45 2019 +0800 +++ b/libtommath/bn_mp_exteuclid.c Mon Sep 16 15:50:38 2019 +0200 @@ -1,4 +1,4 @@ -#include <tommath_private.h> +#include "tommath_private.h" #ifdef BN_MP_EXTEUCLID_C /* LibTomMath, multiple-precision integer library -- Tom St Denis * @@ -9,18 +9,15 @@ * Michael Fromberger but has been written from scratch with * additional optimizations in place. * - * The library is free for all purposes without any express - * guarantee it works. - * - * Tom St Denis, [email protected], http://libtom.org + * SPDX-License-Identifier: Unlicense */ /* Extended euclidean algorithm of (a, b) produces a*u1 + b*u2 = u3 */ -int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3) +int mp_exteuclid(const mp_int *a, const mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3) { - mp_int u1,u2,u3,v1,v2,v3,t1,t2,t3,q,tmp; + mp_int u1, u2, u3, v1, v2, v3, t1, t2, t3, q, tmp; int err; if ((err = mp_init_multi(&u1, &u2, &u3, &v1, &v2, &v3, &t1, &t2, &t3, &q, &tmp, NULL)) != MP_OKAY) { @@ -28,48 +25,90 @@ } /* initialize, (u1,u2,u3) = (1,0,a) */ - mp_set(&u1, 1); - if ((err = mp_copy(a, &u3)) != MP_OKAY) { goto LBL_ERR; } + mp_set(&u1, 1uL); + if ((err = mp_copy(a, &u3)) != MP_OKAY) { + goto LBL_ERR; + } /* initialize, (v1,v2,v3) = (0,1,b) */ - mp_set(&v2, 1); - if ((err = mp_copy(b, &v3)) != MP_OKAY) { goto LBL_ERR; } + mp_set(&v2, 1uL); + if ((err = mp_copy(b, &v3)) != MP_OKAY) { + goto LBL_ERR; + } /* loop while v3 != 0 */ while (mp_iszero(&v3) == MP_NO) { - /* q = u3/v3 */ - if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { goto LBL_ERR; } + /* q = u3/v3 */ + if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { + goto LBL_ERR; + } - /* (t1,t2,t3) = (u1,u2,u3) - (v1,v2,v3)q */ - if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) { goto LBL_ERR; } + /* (t1,t2,t3) = (u1,u2,u3) - (v1,v2,v3)q */ + if ((err = mp_mul(&v1, &q, &tmp)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_sub(&u1, &tmp, &t1)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_mul(&v2, &q, &tmp)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_sub(&u2, &tmp, &t2)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_mul(&v3, &q, &tmp)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_sub(&u3, &tmp, &t3)) != MP_OKAY) { + goto LBL_ERR; + } - /* (u1,u2,u3) = (v1,v2,v3) */ - if ((err = mp_copy(&v1, &u1)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_copy(&v2, &u2)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_copy(&v3, &u3)) != MP_OKAY) { goto LBL_ERR; } + /* (u1,u2,u3) = (v1,v2,v3) */ + if ((err = mp_copy(&v1, &u1)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_copy(&v2, &u2)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_copy(&v3, &u3)) != MP_OKAY) { + goto LBL_ERR; + } - /* (v1,v2,v3) = (t1,t2,t3) */ - if ((err = mp_copy(&t1, &v1)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_copy(&t2, &v2)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { goto LBL_ERR; } + /* (v1,v2,v3) = (t1,t2,t3) */ + if ((err = mp_copy(&t1, &v1)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_copy(&t2, &v2)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_copy(&t3, &v3)) != MP_OKAY) { + goto LBL_ERR; + } } /* make sure U3 >= 0 */ if (u3.sign == MP_NEG) { - if ((err = mp_neg(&u1, &u1)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_neg(&u2, &u2)) != MP_OKAY) { goto LBL_ERR; } - if ((err = mp_neg(&u3, &u3)) != MP_OKAY) { goto LBL_ERR; } + if ((err = mp_neg(&u1, &u1)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_neg(&u2, &u2)) != MP_OKAY) { + goto LBL_ERR; + } + if ((err = mp_neg(&u3, &u3)) != MP_OKAY) { + goto LBL_ERR; + } } /* copy result out */ - if (U1 != NULL) { mp_exch(U1, &u1); } - if (U2 != NULL) { mp_exch(U2, &u2); } - if (U3 != NULL) { mp_exch(U3, &u3); } + if (U1 != NULL) { + mp_exch(U1, &u1); + } + if (U2 != NULL) { + mp_exch(U2, &u2); + } + if (U3 != NULL) { + mp_exch(U3, &u3); + } err = MP_OKAY; LBL_ERR: @@ -78,6 +117,6 @@ } #endif -/* ref: $Format:%D$ */ -/* git commit: $Format:%H$ */ -/* commit time: $Format:%ai$ */ +/* ref: HEAD -> master, tag: v1.1.0 */ +/* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */ +/* commit time: 2019-01-28 20:32:32 +0100 */