wolf SSL / wolfSSL

wolfSSL SSL/TLS library, support up to TLS1.3

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wolfssl/wolfcrypt/fe_operations.h@11:cee25a834751, 2017-05-30 (annotated)

Committer:
wolfSSL
Date:
Tue May 30 01:44:10 2017 +0000
Revision:
11:cee25a834751
wolfSSL 3.11.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 11:cee25a834751 1 /* fe_operations.h
wolfSSL 11:cee25a834751 2 *
wolfSSL 11:cee25a834751 3 * Copyright (C) 2006-2016 wolfSSL Inc.
wolfSSL 11:cee25a834751 4 *
wolfSSL 11:cee25a834751 5 * This file is part of wolfSSL.
wolfSSL 11:cee25a834751 6 *
wolfSSL 11:cee25a834751 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 11:cee25a834751 8 * it under the terms of the GNU General Public License as published by
wolfSSL 11:cee25a834751 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 11:cee25a834751 10 * (at your option) any later version.
wolfSSL 11:cee25a834751 11 *
wolfSSL 11:cee25a834751 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 11:cee25a834751 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 11:cee25a834751 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 11:cee25a834751 15 * GNU General Public License for more details.
wolfSSL 11:cee25a834751 16 *
wolfSSL 11:cee25a834751 17 * You should have received a copy of the GNU General Public License
wolfSSL 11:cee25a834751 18 * along with this program; if not, write to the Free Software
wolfSSL 11:cee25a834751 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335, USA
wolfSSL 11:cee25a834751 20 */
wolfSSL 11:cee25a834751 21
wolfSSL 11:cee25a834751 22
wolfSSL 11:cee25a834751 23 #ifndef WOLF_CRYPT_FE_OPERATIONS_H
wolfSSL 11:cee25a834751 24 #define WOLF_CRYPT_FE_OPERATIONS_H
wolfSSL 11:cee25a834751 25
wolfSSL 11:cee25a834751 26 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 11:cee25a834751 27
wolfSSL 11:cee25a834751 28 #if defined(HAVE_CURVE25519) || defined(HAVE_ED25519)
wolfSSL 11:cee25a834751 29
wolfSSL 11:cee25a834751 30 #ifndef CURVED25519_SMALL
wolfSSL 11:cee25a834751 31 #include <stdint.h>
wolfSSL 11:cee25a834751 32 #endif
wolfSSL 11:cee25a834751 33 #include <wolfssl/wolfcrypt/types.h>
wolfSSL 11:cee25a834751 34
wolfSSL 11:cee25a834751 35 /*
wolfSSL 11:cee25a834751 36 fe means field element.
wolfSSL 11:cee25a834751 37 Here the field is \Z/(2^255-19).
wolfSSL 11:cee25a834751 38 An element t, entries t[0]...t[9], represents the integer
wolfSSL 11:cee25a834751 39 t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
wolfSSL 11:cee25a834751 40 Bounds on each t[i] vary depending on context.
wolfSSL 11:cee25a834751 41 */
wolfSSL 11:cee25a834751 42
wolfSSL 11:cee25a834751 43 #ifdef CURVED25519_SMALL
wolfSSL 11:cee25a834751 44 #define F25519_SIZE 32
wolfSSL 11:cee25a834751 45 typedef byte fe[32];
wolfSSL 11:cee25a834751 46 #elif defined(HAVE___UINT128_T)
wolfSSL 11:cee25a834751 47 typedef int64_t fe[5];
wolfSSL 11:cee25a834751 48 #else
wolfSSL 11:cee25a834751 49 typedef int32_t fe[10];
wolfSSL 11:cee25a834751 50 #endif
wolfSSL 11:cee25a834751 51
wolfSSL 11:cee25a834751 52 #if! defined FREESCALE_LTC_ECC
wolfSSL 11:cee25a834751 53 WOLFSSL_LOCAL int curve25519(byte * q, byte * n, byte * p);
wolfSSL 11:cee25a834751 54 #endif
wolfSSL 11:cee25a834751 55 WOLFSSL_LOCAL void fe_copy(fe, const fe);
wolfSSL 11:cee25a834751 56 WOLFSSL_LOCAL void fe_add(fe, const fe, const fe);
wolfSSL 11:cee25a834751 57 WOLFSSL_LOCAL void fe_neg(fe,const fe);
wolfSSL 11:cee25a834751 58 WOLFSSL_LOCAL void fe_sub(fe, const fe, const fe);
wolfSSL 11:cee25a834751 59 WOLFSSL_LOCAL void fe_invert(fe, const fe);
wolfSSL 11:cee25a834751 60 WOLFSSL_LOCAL void fe_mul(fe,const fe,const fe);
wolfSSL 11:cee25a834751 61
wolfSSL 11:cee25a834751 62 /* default to be faster but take more memory */
wolfSSL 11:cee25a834751 63 #ifndef CURVED25519_SMALL
wolfSSL 11:cee25a834751 64
wolfSSL 11:cee25a834751 65 /* Based On Daniel J Bernstein's curve25519 and ed25519 Public Domain ref10
wolfSSL 11:cee25a834751 66 work. */
wolfSSL 11:cee25a834751 67
wolfSSL 11:cee25a834751 68 WOLFSSL_LOCAL void fe_0(fe);
wolfSSL 11:cee25a834751 69 WOLFSSL_LOCAL void fe_1(fe);
wolfSSL 11:cee25a834751 70 WOLFSSL_LOCAL int fe_isnonzero(const fe);
wolfSSL 11:cee25a834751 71 WOLFSSL_LOCAL int fe_isnegative(const fe);
wolfSSL 11:cee25a834751 72 WOLFSSL_LOCAL void fe_tobytes(unsigned char *, const fe);
wolfSSL 11:cee25a834751 73 WOLFSSL_LOCAL void fe_sq(fe, const fe);
wolfSSL 11:cee25a834751 74 WOLFSSL_LOCAL void fe_sq2(fe,const fe);
wolfSSL 11:cee25a834751 75 WOLFSSL_LOCAL void fe_frombytes(fe,const unsigned char *);
wolfSSL 11:cee25a834751 76 WOLFSSL_LOCAL void fe_cswap(fe, fe, int);
wolfSSL 11:cee25a834751 77 WOLFSSL_LOCAL void fe_mul121666(fe,fe);
wolfSSL 11:cee25a834751 78 WOLFSSL_LOCAL void fe_cmov(fe,const fe, int);
wolfSSL 11:cee25a834751 79 WOLFSSL_LOCAL void fe_pow22523(fe,const fe);
wolfSSL 11:cee25a834751 80
wolfSSL 11:cee25a834751 81 /* 64 type needed for SHA512 */
wolfSSL 11:cee25a834751 82 WOLFSSL_LOCAL uint64_t load_3(const unsigned char *in);
wolfSSL 11:cee25a834751 83 WOLFSSL_LOCAL uint64_t load_4(const unsigned char *in);
wolfSSL 11:cee25a834751 84 #endif /* not defined CURVED25519_SMALL */
wolfSSL 11:cee25a834751 85
wolfSSL 11:cee25a834751 86 /* Use less memory and only 32bit types or less, but is slower
wolfSSL 11:cee25a834751 87 Based on Daniel Beer's public domain work. */
wolfSSL 11:cee25a834751 88 #ifdef CURVED25519_SMALL
wolfSSL 11:cee25a834751 89 static const byte c25519_base_x[F25519_SIZE] = {9};
wolfSSL 11:cee25a834751 90 static const byte f25519_zero[F25519_SIZE] = {0};
wolfSSL 11:cee25a834751 91 static const byte f25519_one[F25519_SIZE] = {1};
wolfSSL 11:cee25a834751 92 static const byte fprime_zero[F25519_SIZE] = {0};
wolfSSL 11:cee25a834751 93 static const byte fprime_one[F25519_SIZE] = {1};
wolfSSL 11:cee25a834751 94
wolfSSL 11:cee25a834751 95 WOLFSSL_LOCAL void fe_load(byte *x, word32 c);
wolfSSL 11:cee25a834751 96 WOLFSSL_LOCAL void fe_normalize(byte *x);
wolfSSL 11:cee25a834751 97 WOLFSSL_LOCAL void fe_inv__distinct(byte *r, const byte *x);
wolfSSL 11:cee25a834751 98
wolfSSL 11:cee25a834751 99 /* Conditional copy. If condition == 0, then zero is copied to dst. If
wolfSSL 11:cee25a834751 100 * condition == 1, then one is copied to dst. Any other value results in
wolfSSL 11:cee25a834751 101 * undefined behavior.
wolfSSL 11:cee25a834751 102 */
wolfSSL 11:cee25a834751 103 WOLFSSL_LOCAL void fe_select(byte *dst, const byte *zero, const byte *one,
wolfSSL 11:cee25a834751 104 byte condition);
wolfSSL 11:cee25a834751 105
wolfSSL 11:cee25a834751 106 /* Multiply a point by a small constant. The two pointers are not
wolfSSL 11:cee25a834751 107 * required to be distinct.
wolfSSL 11:cee25a834751 108 *
wolfSSL 11:cee25a834751 109 * The constant must be less than 2^24.
wolfSSL 11:cee25a834751 110 */
wolfSSL 11:cee25a834751 111 WOLFSSL_LOCAL void fe_mul_c(byte *r, const byte *a, word32 b);
wolfSSL 11:cee25a834751 112 WOLFSSL_LOCAL void fe_mul__distinct(byte *r, const byte *a, const byte *b);
wolfSSL 11:cee25a834751 113
wolfSSL 11:cee25a834751 114 /* Compute one of the square roots of the field element, if the element
wolfSSL 11:cee25a834751 115 * is square. The other square is -r.
wolfSSL 11:cee25a834751 116 *
wolfSSL 11:cee25a834751 117 * If the input is not square, the returned value is a valid field
wolfSSL 11:cee25a834751 118 * element, but not the correct answer. If you don't already know that
wolfSSL 11:cee25a834751 119 * your element is square, you should square the return value and test.
wolfSSL 11:cee25a834751 120 */
wolfSSL 11:cee25a834751 121 WOLFSSL_LOCAL void fe_sqrt(byte *r, const byte *x);
wolfSSL 11:cee25a834751 122
wolfSSL 11:cee25a834751 123 /* Conditional copy. If condition == 0, then zero is copied to dst. If
wolfSSL 11:cee25a834751 124 * condition == 1, then one is copied to dst. Any other value results in
wolfSSL 11:cee25a834751 125 * undefined behavior.
wolfSSL 11:cee25a834751 126 */
wolfSSL 11:cee25a834751 127 WOLFSSL_LOCAL void fprime_select(byte *dst, const byte *zero, const byte *one,
wolfSSL 11:cee25a834751 128 byte condition);
wolfSSL 11:cee25a834751 129 WOLFSSL_LOCAL void fprime_add(byte *r, const byte *a, const byte *modulus);
wolfSSL 11:cee25a834751 130 WOLFSSL_LOCAL void fprime_sub(byte *r, const byte *a, const byte *modulus);
wolfSSL 11:cee25a834751 131 WOLFSSL_LOCAL void fprime_mul(byte *r, const byte *a, const byte *b,
wolfSSL 11:cee25a834751 132 const byte *modulus);
wolfSSL 11:cee25a834751 133 WOLFSSL_LOCAL void fprime_copy(byte *x, const byte *a);
wolfSSL 11:cee25a834751 134 #endif /* CURVED25519_SMALL */
wolfSSL 11:cee25a834751 135 #endif /* HAVE_CURVE25519 or HAVE_ED25519 */
wolfSSL 11:cee25a834751 136 #endif /* WOLF_CRYPT_FE_OPERATIONS_H */
wolfSSL 11:cee25a834751 137
wolfSSL 11:cee25a834751 138