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| author | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-10-07 11:37:36 (GMT) |
|---|---|---|
| committer | jan.nijtmans <nijtmans@users.sourceforge.net> | 2019-10-07 11:37:36 (GMT) |
| commit | 1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111 (patch) | |
| tree | 2312b71d74326ff86bcbd4acecb0f10a1c0ad63c /libtommath/bn_mp_exteuclid.c | |
| parent | 1cb1fee6edc063cb49beb0188c2a3db4771846fa (diff) | |
| download | tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.zip tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.tar.gz tcl-1e29c4f4ad0ec8903b99967d45b6ea0ea76c6111.tar.bz2 | |
Update to latest "develop" branch
Diffstat (limited to 'libtommath/bn_mp_exteuclid.c')
| -rw-r--r-- | libtommath/bn_mp_exteuclid.c | 72 |
1 files changed, 18 insertions, 54 deletions
diff --git a/libtommath/bn_mp_exteuclid.c b/libtommath/bn_mp_exteuclid.c index 3af7467..faf47ba 100644 --- a/libtommath/bn_mp_exteuclid.c +++ b/libtommath/bn_mp_exteuclid.c @@ -17,77 +17,41 @@ mp_err mp_exteuclid(const mp_int *a, const mp_int *b, mp_int *U1, mp_int *U2, mp /* initialize, (u1,u2,u3) = (1,0,a) */ mp_set(&u1, 1uL); - if ((err = mp_copy(a, &u3)) != MP_OKAY) { - goto LBL_ERR; - } + if ((err = mp_copy(a, &u3)) != MP_OKAY) goto LBL_ERR; /* initialize, (v1,v2,v3) = (0,1,b) */ mp_set(&v2, 1uL); - if ((err = mp_copy(b, &v3)) != MP_OKAY) { - goto LBL_ERR; - } + if ((err = mp_copy(b, &v3)) != MP_OKAY) goto LBL_ERR; /* loop while v3 != 0 */ while (!MP_IS_ZERO(&v3)) { /* q = u3/v3 */ - if ((err = mp_div(&u3, &v3, &q, NULL)) != MP_OKAY) { - goto LBL_ERR; - } + 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; - } + 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; - } + 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; - } + 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 */ |