From 1b5af90b45977f757598f82d61a4cf12aeaf18bb Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bodo=20M=C3=B6ller?= Date: Fri, 27 Aug 2010 11:29:30 +0000 Subject: [PATCH] C conformity fixes: - Move declarations before statements in all blocks. - Where 64-bit type is required, use it explicitly (not 1l). --- crypto/ec/ecp_nistp224.c | 34 ++++++++++++++++++++++------------ 1 file changed, 22 insertions(+), 12 deletions(-) diff --git a/crypto/ec/ecp_nistp224.c b/crypto/ec/ecp_nistp224.c index 72ce299725..2ea80d634f 100644 --- a/crypto/ec/ecp_nistp224.c +++ b/crypto/ec/ecp_nistp224.c @@ -254,9 +254,11 @@ static int BN_to_felem(fslice out[4], const BIGNUM *bn) { u8 b_in[fElemSize]; u8 b_out[fElemSize]; + unsigned num_bytes; + /* BN_bn2bin eats leading zeroes */ memset(b_out, 0, fElemSize); - unsigned num_bytes = BN_num_bytes(bn); + num_bytes = BN_num_bytes(bn); if (num_bytes > fElemSize) { ECerr(EC_F_BN_TO_FELEM, EC_R_BIGNUM_OUT_OF_RANGE); @@ -305,9 +307,10 @@ static void felem_sum64(fslice out[4], const fslice in[4]) /* Assumes in[i] < 2^57 */ static void felem_diff64(fslice out[4], const fslice in[4]) { - static const uint64_t two58p2 = (1l << 58) + (1l << 2); - static const uint64_t two58m2 = (1l << 58) - (1l << 2); - static const uint64_t two58m42m2 = (1l << 58) - (1l << 42) - (1l << 2); + static const uint64_t two58p2 = (((uint64_t) 1) << 58) + (((uint64_t) 1) << 2); + static const uint64_t two58m2 = (((uint64_t) 1) << 58) - (((uint64_t) 1) << 2); + static const uint64_t two58m42m2 = (((uint64_t) 1) << 58) - + (((uint64_t) 1) << 42) - (((uint64_t) 1) << 2); /* Add 0 mod 2^224-2^96+1 to ensure out > in */ out[0] += two58p2; @@ -487,7 +490,7 @@ static void felem_reduce(fslice out[4], const uint128_t in[7]) /* Reduce to unique minimal representation */ static void felem_contract(fslice out[4], const fslice in[4]) { - static const int64_t two56 = (1l << 56); + static const int64_t two56 = ((uint64_t) 1) << 56; /* 0 <= in < 2^225 */ /* if in > 2^224 , reduce in = in - 2^224 + 2^96 - 1 */ int64_t tmp[4], a; @@ -585,15 +588,17 @@ static void felem_contract(fslice out[4], const fslice in[4]) * and 2^225 - 2^97 + 2 */ static fslice felem_is_zero(const fslice in[4]) { - fslice zero = (in[0] | in[1] | in[2] | in[3]); + fslice zero, two224m96p1, two225m97p2; + + zero = in[0] | in[1] | in[2] | in[3]; zero = (((int64_t)(zero) - 1) >> 63) & 1; - fslice two224m96p1 = (in[0] ^ 1) | (in[1] ^ 0x00ffff0000000000) + two224m96p1 = (in[0] ^ 1) | (in[1] ^ 0x00ffff0000000000) | (in[2] ^ 0x00ffffffffffffff) | (in[3] ^ 0x00ffffffffffffff); two224m96p1 = (((int64_t)(two224m96p1) - 1) >> 63) & 1; - fslice two225m97p2 = (in[0] ^ 2) | (in[1] ^ 0x00fffe0000000000) + two225m97p2 = (in[0] ^ 2) | (in[1] ^ 0x00fffe0000000000) | (in[2] ^ 0x00ffffffffffffff) | (in[3] ^ 0x01ffffffffffffff); two225m97p2 = (((int64_t)(two225m97p2) - 1) >> 63) & 1; - return (zero | two224m96p1 | two225m97p2); + return (zero | two224m96p1 | two225m97p2); } /* Invert a field element */ @@ -603,6 +608,7 @@ static void felem_inv(fslice out[4], const fslice in[4]) fslice ftmp[4], ftmp2[4], ftmp3[4], ftmp4[4]; uint128_t tmp[7]; unsigned i; + felem_square(tmp, in); felem_reduce(ftmp, tmp); /* 2 */ felem_mul(tmp, in, ftmp); felem_reduce(ftmp, tmp); /* 2^2 - 1 */ felem_square(tmp, ftmp); felem_reduce(ftmp, tmp); /* 2^3 - 2 */ @@ -959,11 +965,12 @@ static void batch_mul(fslice x_out[4], fslice y_out[4], fslice z_out[4], unsigned i, j, num; unsigned gen_mul = (g_scalar != NULL); fslice nq[12], nqt[12], tmp[12]; - /* set nq to the point at infinity */ - memset(nq, 0, 12 * sizeof(fslice)); fslice bits[4]; u8 byte; + /* set nq to the point at infinity */ + memset(nq, 0, 12 * sizeof(fslice)); + /* Loop over all scalars msb-to-lsb, 4 bits at a time: for each nibble, * double 4 times, then add the precomputed point multiples. * If we are also adding multiples of the generator, then interleave @@ -1087,10 +1094,10 @@ int ec_GFp_nistp224_group_init(EC_GROUP *group) int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p, const BIGNUM *a, const BIGNUM *b, BN_CTX *ctx) { - int ret = 0; BN_CTX *new_ctx = NULL; BIGNUM *curve_p, *curve_a, *curve_b; + if (ctx == NULL) if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0; BN_CTX_start(ctx); @@ -1123,6 +1130,7 @@ int ec_GFp_nistp224_point_get_affine_coordinates(const EC_GROUP *group, { fslice z1[4], z2[4], x_in[4], y_in[4], x_out[4], y_out[4]; uint128_t tmp[7]; + if (EC_POINT_is_at_infinity(group, point)) { ECerr(EC_F_EC_GFP_NISTP224_POINT_GET_AFFINE_COORDINATES, @@ -1180,6 +1188,7 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, EC_POINT *generator = NULL; const EC_POINT *p = NULL; const BIGNUM *p_scalar = NULL; + if (ctx == NULL) if ((ctx = new_ctx = BN_CTX_new()) == NULL) return 0; BN_CTX_start(ctx); @@ -1359,6 +1368,7 @@ int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx) BN_CTX *new_ctx = NULL; BIGNUM *x, *y; EC_POINT *generator = NULL; + /* throw away old precomputation */ EC_EX_DATA_free_data(&group->extra_data, nistp224_pre_comp_dup, nistp224_pre_comp_free, nistp224_pre_comp_clear_free); -- 2.25.1