diff options
Diffstat (limited to 'libtommath/bn_mp_karatsuba_sqr.c')
| -rw-r--r-- | libtommath/bn_mp_karatsuba_sqr.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/libtommath/bn_mp_karatsuba_sqr.c b/libtommath/bn_mp_karatsuba_sqr.c index 315ceab..6d8ad6e 100644 --- a/libtommath/bn_mp_karatsuba_sqr.c +++ b/libtommath/bn_mp_karatsuba_sqr.c @@ -12,7 +12,7 @@ * The library is free for all purposes without any express * guarantee it works. * - * Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org + * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com */ /* Karatsuba squaring, computes b = a*a using three @@ -80,8 +80,8 @@ int mp_karatsuba_sqr (mp_int * a, mp_int * b) if (mp_sqr (&x1, &x1x1) != MP_OKAY) goto X1X1; /* x1x1 = x1*x1 */ - /* now calc (x1-x0)**2 */ - if (mp_sub (&x1, &x0, &t1) != MP_OKAY) + /* now calc (x1+x0)**2 */ + if (s_mp_add (&x1, &x0, &t1) != MP_OKAY) goto X1X1; /* t1 = x1 - x0 */ if (mp_sqr (&t1, &t1) != MP_OKAY) goto X1X1; /* t1 = (x1 - x0) * (x1 - x0) */ @@ -89,8 +89,8 @@ int mp_karatsuba_sqr (mp_int * a, mp_int * b) /* add x0y0 */ if (s_mp_add (&x0x0, &x1x1, &t2) != MP_OKAY) goto X1X1; /* t2 = x0x0 + x1x1 */ - if (mp_sub (&t2, &t1, &t1) != MP_OKAY) - goto X1X1; /* t1 = x0x0 + x1x1 - (x1-x0)*(x1-x0) */ + if (s_mp_sub (&t1, &t2, &t1) != MP_OKAY) + goto X1X1; /* t1 = (x1+x0)**2 - (x0x0 + x1x1) */ /* shift by B */ if (mp_lshd (&t1, B) != MP_OKAY) @@ -115,3 +115,7 @@ ERR: return err; } #endif + +/* $Source: /cvs/libtom/libtommath/bn_mp_karatsuba_sqr.c,v $ */ +/* $Revision: 1.5 $ */ +/* $Date: 2006/03/31 14:18:44 $ */ |