From 396cb5657bd08c3c8114902259f09306c21c897c Mon Sep 17 00:00:00 2001 From: =?utf8?q?Bodo=20M=C3=B6ller?= Date: Fri, 27 Aug 2010 13:17:59 +0000 Subject: [PATCH] More C language police work. --- crypto/ec/ecp_nistp224.c | 96 ++++++++++++++++++++++------------------ 1 file changed, 53 insertions(+), 43 deletions(-) diff --git a/crypto/ec/ecp_nistp224.c b/crypto/ec/ecp_nistp224.c index 2ea80d634f..e0ca2dca17 100644 --- a/crypto/ec/ecp_nistp224.c +++ b/crypto/ec/ecp_nistp224.c @@ -68,27 +68,15 @@ #include #include "ec_lcl.h" -typedef __uint128_t uint128_t; /* nonstandard; implemented by gcc on 64-bit platforms */ +#if defined(__GNUC__) && (__GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ >= 1)) + /* even with gcc, the typedef won't work for 32-bit platforms */ + typedef __uint128_t uint128_t; /* nonstandard; implemented by gcc on 64-bit platforms */ +#else + #error "Need GCC 3.1 or later to define type uint128_t" +#endif typedef uint8_t u8; -static const u8 nistp224_curve_params[5*28] = { - 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* p */ - 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00, - 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01, - 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* a */ - 0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF, - 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE, - 0xB4,0x05,0x0A,0x85,0x0C,0x04,0xB3,0xAB,0xF5,0x41, /* b */ - 0x32,0x56,0x50,0x44,0xB0,0xB7,0xD7,0xBF,0xD8,0xBA, - 0x27,0x0B,0x39,0x43,0x23,0x55,0xFF,0xB4, - 0xB7,0x0E,0x0C,0xBD,0x6B,0xB4,0xBF,0x7F,0x32,0x13, /* x */ - 0x90,0xB9,0x4A,0x03,0xC1,0xD3,0x56,0xC2,0x11,0x22, - 0x34,0x32,0x80,0xD6,0x11,0x5C,0x1D,0x21, - 0xbd,0x37,0x63,0x88,0xb5,0xf7,0x23,0xfb,0x4c,0x22, /* y */ - 0xdf,0xe6,0xcd,0x43,0x75,0xa0,0x5a,0x07,0x47,0x64, - 0x44,0xd5,0x81,0x99,0x85,0x00,0x7e,0x34 -}; /******************************************************************************/ /* INTERNAL REPRESENTATION OF FIELD ELEMENTS @@ -108,8 +96,27 @@ static const u8 nistp224_curve_params[5*28] = { typedef uint64_t fslice; -/* Field element size (and group order size), in bytes: 28*8 = 224 */ -static const unsigned fElemSize = 28; +/* Field element represented as a byte arrary. + * 28*8 = 224 bits is also the group order size for the elliptic curve. */ +typedef u8 felem_bytearray[28]; + +static const felem_bytearray nistp224_curve_params[5] = { + {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* p */ + 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00,0x00,0x00,0x00, + 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x01}, + {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF, /* a */ + 0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0xFF,0xFF,0xFF,0xFF, + 0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFE}, + {0xB4,0x05,0x0A,0x85,0x0C,0x04,0xB3,0xAB,0xF5,0x41, /* b */ + 0x32,0x56,0x50,0x44,0xB0,0xB7,0xD7,0xBF,0xD8,0xBA, + 0x27,0x0B,0x39,0x43,0x23,0x55,0xFF,0xB4}, + {0xB7,0x0E,0x0C,0xBD,0x6B,0xB4,0xBF,0x7F,0x32,0x13, /* x */ + 0x90,0xB9,0x4A,0x03,0xC1,0xD3,0x56,0xC2,0x11,0x22, + 0x34,0x32,0x80,0xD6,0x11,0x5C,0x1D,0x21}, + {0xbd,0x37,0x63,0x88,0xb5,0xf7,0x23,0xfb,0x4c,0x22, /* y */ + 0xdf,0xe6,0xcd,0x43,0x75,0xa0,0x5a,0x07,0x47,0x64, + 0x44,0xd5,0x81,0x99,0x85,0x00,0x7e,0x34} +}; /* Precomputed multiples of the standard generator * b_0*G + b_1*2^56*G + b_2*2^112*G + b_3*2^168*G for @@ -252,14 +259,14 @@ static void flip_endian(u8 *out, const u8 *in, unsigned len) /* From OpenSSL BIGNUM to internal representation */ static int BN_to_felem(fslice out[4], const BIGNUM *bn) { - u8 b_in[fElemSize]; - u8 b_out[fElemSize]; + felem_bytearray b_in; + felem_bytearray b_out; unsigned num_bytes; /* BN_bn2bin eats leading zeroes */ - memset(b_out, 0, fElemSize); + memset(b_out, 0, sizeof b_out); num_bytes = BN_num_bytes(bn); - if (num_bytes > fElemSize) + if (num_bytes > sizeof b_out) { ECerr(EC_F_BN_TO_FELEM, EC_R_BIGNUM_OUT_OF_RANGE); return 0; @@ -278,10 +285,10 @@ static int BN_to_felem(fslice out[4], const BIGNUM *bn) /* From internal representation to OpenSSL BIGNUM */ static BIGNUM *felem_to_BN(BIGNUM *out, const fslice in[4]) { - u8 b_in[fElemSize], b_out[fElemSize]; + felem_bytearray b_in, b_out; felem_to_bin28(b_in, in); - flip_endian(b_out, b_in, fElemSize); - return BN_bin2bn(b_out, fElemSize, out); + flip_endian(b_out, b_in, sizeof b_out); + return BN_bin2bn(b_out, sizeof b_out, out); } /******************************************************************************/ @@ -959,7 +966,7 @@ static void select_point(const fslice bits[4], const fslice pre_comp[16][3][4], * of the generator, using certain (large) precomputed multiples in g_pre_comp. * Output point (X, Y, Z) is stored in x_out, y_out, z_out */ static void batch_mul(fslice x_out[4], fslice y_out[4], fslice z_out[4], - const u8 scalars[][fElemSize], const unsigned num_points, const u8 *g_scalar, + const felem_bytearray scalars[], const unsigned num_points, const u8 *g_scalar, const fslice pre_comp[][16][3][4], const fslice g_pre_comp[16][3][4]) { unsigned i, j, num; @@ -1104,9 +1111,9 @@ int ec_GFp_nistp224_group_set_curve(EC_GROUP *group, const BIGNUM *p, if (((curve_p = BN_CTX_get(ctx)) == NULL) || ((curve_a = BN_CTX_get(ctx)) == NULL) || ((curve_b = BN_CTX_get(ctx)) == NULL)) goto err; - BN_bin2bn(nistp224_curve_params, fElemSize, curve_p); - BN_bin2bn(nistp224_curve_params + 28, fElemSize, curve_a); - BN_bin2bn(nistp224_curve_params + 56, fElemSize, curve_b); + BN_bin2bn(nistp224_curve_params[0], sizeof(felem_bytearray), curve_p); + BN_bin2bn(nistp224_curve_params[1], sizeof(felem_bytearray), curve_a); + BN_bin2bn(nistp224_curve_params[2], sizeof(felem_bytearray), curve_b); if ((BN_cmp(curve_p, p)) || (BN_cmp(curve_a, a)) || (BN_cmp(curve_b, b))) { @@ -1175,10 +1182,10 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, int i, j; BN_CTX *new_ctx = NULL; BIGNUM *x, *y, *z, *tmp_scalar; - u8 g_secret[fElemSize]; - u8 (*secrets)[fElemSize] = NULL; + felem_bytearray g_secret; + felem_bytearray *secrets = NULL; fslice (*pre_comp)[16][3][4] = NULL; - u8 tmp[fElemSize]; + felem_bytearray tmp; unsigned num_bytes; int have_pre_comp = 0; size_t num_points = num; @@ -1231,7 +1238,7 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, * treat the generator as a random point */ num_points = num_points + 1; } - secrets = OPENSSL_malloc(num_points * fElemSize); + secrets = OPENSSL_malloc(num_points * sizeof(felem_bytearray)); pre_comp = OPENSSL_malloc(num_points * 16 * 3 * 4 * sizeof(fslice)); if ((num_points) && ((secrets == NULL) || (pre_comp == NULL))) @@ -1242,7 +1249,7 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, /* we treat NULL scalars as 0, and NULL points as points at infinity, * i.e., they contribute nothing to the linear combination */ - memset(secrets, 0, num_points * fElemSize); + memset(secrets, 0, num_points * sizeof(felem_bytearray)); memset(pre_comp, 0, num_points * 16 * 3 * 4 * sizeof(fslice)); for (i = 0; i < num_points; ++i) { @@ -1262,7 +1269,7 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, { num_bytes = BN_num_bytes(p_scalar); /* reduce scalar to 0 <= scalar < 2^224 */ - if ((num_bytes > fElemSize) || (BN_is_negative(p_scalar))) + if ((num_bytes > sizeof(felem_bytearray)) || (BN_is_negative(p_scalar))) { /* this is an unusual input, and we don't guarantee * constant-timeness */ @@ -1307,10 +1314,10 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, /* the scalar for the generator */ if ((scalar != NULL) && (have_pre_comp)) { - memset(g_secret, 0, fElemSize); + memset(g_secret, 0, sizeof g_secret); num_bytes = BN_num_bytes(scalar); /* reduce scalar to 0 <= scalar < 2^224 */ - if ((num_bytes > fElemSize) || (BN_is_negative(scalar))) + if ((num_bytes > sizeof(felem_bytearray)) || (BN_is_negative(scalar))) { /* this is an unusual input, and we don't guarantee * constant-timeness */ @@ -1326,14 +1333,14 @@ int ec_GFp_nistp224_points_mul(const EC_GROUP *group, EC_POINT *r, flip_endian(g_secret, tmp, num_bytes); /* do the multiplication with generator precomputation*/ batch_mul(x_out, y_out, z_out, - (const u8 (*)[fElemSize]) secrets, num_points, + (const felem_bytearray (*)) secrets, num_points, g_secret, (const fslice (*)[16][3][4]) pre_comp, (const fslice (*)[3][4]) g_pre_comp); } else /* do the multiplication without generator precomputation */ batch_mul(x_out, y_out, z_out, - (const u8 (*)[fElemSize]) secrets, num_points, + (const felem_bytearray (*)) secrets, num_points, NULL, (const fslice (*)[16][3][4]) pre_comp, NULL); /* reduce the output to its unique minimal representation */ felem_contract(x_in, x_out); @@ -1383,8 +1390,8 @@ int ec_GFp_nistp224_precompute_mult(EC_GROUP *group, BN_CTX *ctx) generator = EC_POINT_new(group); if (generator == NULL) goto err; - BN_bin2bn(nistp224_curve_params + 84, fElemSize, x); - BN_bin2bn(nistp224_curve_params + 112, fElemSize, y); + BN_bin2bn(nistp224_curve_params[3], sizeof (felem_bytearray), x); + BN_bin2bn(nistp224_curve_params[4], sizeof (felem_bytearray), y); if (!EC_POINT_set_affine_coordinates_GFp(group, generator, x, y, ctx)) goto err; if ((pre = nistp224_pre_comp_new()) == NULL) @@ -1478,4 +1485,7 @@ int ec_GFp_nistp224_have_precompute_mult(const EC_GROUP *group) else return 0; } + +#else +static void *dummy=&dummy; #endif -- 2.40.0