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| author | jan.nijtmans <nijtmans@users.sourceforge.net> | 2017-09-18 08:31:55 (GMT) |
|---|---|---|
| committer | jan.nijtmans <nijtmans@users.sourceforge.net> | 2017-09-18 08:31:55 (GMT) |
| commit | a187f65cfd5964971d7ed52f09e18fdbb4bf51cc (patch) | |
| tree | 6b7bbde03122d1571d4543d10eccfe88610bd680 /libtommath/bn_mp_exteuclid.c | |
| parent | 0faaca01de4e9fa2039c7fdd34f60b138f665249 (diff) | |
| parent | 30f7e69b182d1267056ee2628a860891f6555aa3 (diff) | |
| download | tcl-a187f65cfd5964971d7ed52f09e18fdbb4bf51cc.zip tcl-a187f65cfd5964971d7ed52f09e18fdbb4bf51cc.tar.gz tcl-a187f65cfd5964971d7ed52f09e18fdbb4bf51cc.tar.bz2 | |
Merge libtommath upstream changes (astyle formatting only). No functional changes. All Tcl-specific modifications are kept.
Diffstat (limited to 'libtommath/bn_mp_exteuclid.c')
| -rw-r--r-- | libtommath/bn_mp_exteuclid.c | 92 |
1 files changed, 67 insertions, 25 deletions
diff --git a/libtommath/bn_mp_exteuclid.c b/libtommath/bn_mp_exteuclid.c index 3c9612e..419146b 100644 --- a/libtommath/bn_mp_exteuclid.c +++ b/libtommath/bn_mp_exteuclid.c @@ -29,47 +29,89 @@ int mp_exteuclid(mp_int *a, mp_int *b, mp_int *U1, mp_int *U2, mp_int *U3) /* initialize, (u1,u2,u3) = (1,0,a) */ mp_set(&u1, 1); - 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, 1); - 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_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: |