ec2_mult.c readability update.

[openssl.git] / crypto / ec / ec2_mult.c

diff --git a/crypto/ec/ec2_mult.c b/crypto/ec/ec2_mult.c
index 8e2b2a27cda3b22d36b71da42ffa931806d2071b..ab631a50a22cbdcc94dc26610f61f9b57dfd5e08 100644 (file)
--- a/crypto/ec/ec2_mult.c
+++ b/crypto/ec/ec2_mult.c
@@ -216,8 +216,8 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, EC_POINT *r,
        const EC_POINT *point, BN_CTX *ctx)
        {
        BIGNUM *x1, *x2, *z1, *z2;
-       int ret = 0, i, j;
-       BN_ULONG mask;
+       int ret = 0, i;
+       BN_ULONG mask,word;
 
        if (r == point)
                {
@@ -251,22 +251,24 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, EC_POINT *r,
        if (!BN_GF2m_add(x2, x2, &group->b)) goto err; /* x2 = x^4 + b */
 
        /* find top most bit and go one past it */
-       i = scalar->top - 1; j = BN_BITS2 - 1;
+       i = scalar->top - 1;
        mask = BN_TBIT;
-       while (!(scalar->d[i] & mask)) { mask >>= 1; j--; }
-       mask >>= 1; j--;
+       word = scalar->d[i];
+       while (!(word & mask)) mask >>= 1;
+       mask >>= 1;
        /* if top most bit was at word break, go to next word */
        if (!mask) 
                {
-               i--; j = BN_BITS2 - 1;
+               i--;
                mask = BN_TBIT;
                }
 
        for (; i >= 0; i--)
                {
-               for (; j >= 0; j--)
+               word = scalar->d[i];
+               while (mask)
                        {
-                       if (scalar->d[i] & mask)
+                       if (word & mask)
                                {
                                if (!gf2m_Madd(group, &point->X, x1, z1, x2, z2, ctx)) goto err;
                                if (!gf2m_Mdouble(group, x2, z2, ctx)) goto err;
@@ -278,7 +280,6 @@ static int ec_GF2m_montgomery_point_multiply(const EC_GROUP *group, EC_POINT *r,
                                }
                        mask >>= 1;
                        }
-               j = BN_BITS2 - 1;
                mask = BN_TBIT;
                }