wolf SSL / wolfSSL

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

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wolfssl/wolfcrypt/fe_operations.h@0:d92f9d21154c, 2015-06-26 (annotated)

Committer:
wolfSSL
Date:
Fri Jun 26 00:39:20 2015 +0000
Revision:
0:d92f9d21154c
wolfSSL 3.6.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wolfSSL 0:d92f9d21154c 1 /* fe_operations.h
wolfSSL 0:d92f9d21154c 2 *
wolfSSL 0:d92f9d21154c 3 * Copyright (C) 2006-2015 wolfSSL Inc.
wolfSSL 0:d92f9d21154c 4 *
wolfSSL 0:d92f9d21154c 5 * This file is part of wolfSSL. (formerly known as CyaSSL)
wolfSSL 0:d92f9d21154c 6 *
wolfSSL 0:d92f9d21154c 7 * wolfSSL is free software; you can redistribute it and/or modify
wolfSSL 0:d92f9d21154c 8 * it under the terms of the GNU General Public License as published by
wolfSSL 0:d92f9d21154c 9 * the Free Software Foundation; either version 2 of the License, or
wolfSSL 0:d92f9d21154c 10 * (at your option) any later version.
wolfSSL 0:d92f9d21154c 11 *
wolfSSL 0:d92f9d21154c 12 * wolfSSL is distributed in the hope that it will be useful,
wolfSSL 0:d92f9d21154c 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
wolfSSL 0:d92f9d21154c 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
wolfSSL 0:d92f9d21154c 15 * GNU General Public License for more details.
wolfSSL 0:d92f9d21154c 16 *
wolfSSL 0:d92f9d21154c 17 * You should have received a copy of the GNU General Public License
wolfSSL 0:d92f9d21154c 18 * along with this program; if not, write to the Free Software
wolfSSL 0:d92f9d21154c 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
wolfSSL 0:d92f9d21154c 20 */
wolfSSL 0:d92f9d21154c 21
wolfSSL 0:d92f9d21154c 22 #ifndef WOLF_CRYPT_FE_OPERATIONS_H
wolfSSL 0:d92f9d21154c 23 #define WOLF_CRYPT_FE_OPERATIONS_H
wolfSSL 0:d92f9d21154c 24
wolfSSL 0:d92f9d21154c 25 #include <wolfssl/wolfcrypt/settings.h>
wolfSSL 0:d92f9d21154c 26
wolfSSL 0:d92f9d21154c 27 #if defined(HAVE_CURVE25519) || defined(HAVE_ED25519)
wolfSSL 0:d92f9d21154c 28
wolfSSL 0:d92f9d21154c 29 #ifndef CURVED25519_SMALL
wolfSSL 0:d92f9d21154c 30 #include <stdint.h>
wolfSSL 0:d92f9d21154c 31 #endif
wolfSSL 0:d92f9d21154c 32 #include <wolfssl/wolfcrypt/types.h>
wolfSSL 0:d92f9d21154c 33
wolfSSL 0:d92f9d21154c 34 /*
wolfSSL 0:d92f9d21154c 35 fe means field element.
wolfSSL 0:d92f9d21154c 36 Here the field is \Z/(2^255-19).
wolfSSL 0:d92f9d21154c 37 An element t, entries t[0]...t[9], represents the integer
wolfSSL 0:d92f9d21154c 38 t[0]+2^26 t[1]+2^51 t[2]+2^77 t[3]+2^102 t[4]+...+2^230 t[9].
wolfSSL 0:d92f9d21154c 39 Bounds on each t[i] vary depending on context.
wolfSSL 0:d92f9d21154c 40 */
wolfSSL 0:d92f9d21154c 41
wolfSSL 0:d92f9d21154c 42 #ifdef CURVED25519_SMALL
wolfSSL 0:d92f9d21154c 43 #define F25519_SIZE 32
wolfSSL 0:d92f9d21154c 44 typedef byte fe[32];
wolfSSL 0:d92f9d21154c 45 #else
wolfSSL 0:d92f9d21154c 46 typedef int32_t fe[10];
wolfSSL 0:d92f9d21154c 47 #endif
wolfSSL 0:d92f9d21154c 48
wolfSSL 0:d92f9d21154c 49 WOLFSSL_LOCAL int curve25519(byte * q, byte * n, byte * p);
wolfSSL 0:d92f9d21154c 50 WOLFSSL_LOCAL void fe_copy(fe, const fe);
wolfSSL 0:d92f9d21154c 51 WOLFSSL_LOCAL void fe_add(fe, const fe, const fe);
wolfSSL 0:d92f9d21154c 52 WOLFSSL_LOCAL void fe_neg(fe,const fe);
wolfSSL 0:d92f9d21154c 53 WOLFSSL_LOCAL void fe_sub(fe, const fe, const fe);
wolfSSL 0:d92f9d21154c 54 WOLFSSL_LOCAL void fe_invert(fe, const fe);
wolfSSL 0:d92f9d21154c 55 WOLFSSL_LOCAL void fe_mul(fe,const fe,const fe);
wolfSSL 0:d92f9d21154c 56
wolfSSL 0:d92f9d21154c 57 /* default to be faster but take more memory */
wolfSSL 0:d92f9d21154c 58 #ifndef CURVED25519_SMALL
wolfSSL 0:d92f9d21154c 59
wolfSSL 0:d92f9d21154c 60 /* Based On Daniel J Bernstein's curve25519 and ed25519 Public Domain ref10
wolfSSL 0:d92f9d21154c 61 work. */
wolfSSL 0:d92f9d21154c 62
wolfSSL 0:d92f9d21154c 63 WOLFSSL_LOCAL void fe_0(fe);
wolfSSL 0:d92f9d21154c 64 WOLFSSL_LOCAL void fe_1(fe);
wolfSSL 0:d92f9d21154c 65 WOLFSSL_LOCAL int fe_isnonzero(const fe);
wolfSSL 0:d92f9d21154c 66 WOLFSSL_LOCAL int fe_isnegative(const fe);
wolfSSL 0:d92f9d21154c 67 WOLFSSL_LOCAL void fe_tobytes(unsigned char *, const fe);
wolfSSL 0:d92f9d21154c 68 WOLFSSL_LOCAL void fe_sq(fe, const fe);
wolfSSL 0:d92f9d21154c 69 WOLFSSL_LOCAL void fe_sq2(fe,const fe);
wolfSSL 0:d92f9d21154c 70 WOLFSSL_LOCAL void fe_frombytes(fe,const unsigned char *);
wolfSSL 0:d92f9d21154c 71 WOLFSSL_LOCAL void fe_cswap(fe,fe,unsigned int);
wolfSSL 0:d92f9d21154c 72 WOLFSSL_LOCAL void fe_mul121666(fe,fe);
wolfSSL 0:d92f9d21154c 73 WOLFSSL_LOCAL void fe_cmov(fe,const fe,unsigned int);
wolfSSL 0:d92f9d21154c 74 WOLFSSL_LOCAL void fe_pow22523(fe,const fe);
wolfSSL 0:d92f9d21154c 75
wolfSSL 0:d92f9d21154c 76 /* 64 type needed for SHA512 */
wolfSSL 0:d92f9d21154c 77 WOLFSSL_LOCAL uint64_t load_3(const unsigned char *in);
wolfSSL 0:d92f9d21154c 78 WOLFSSL_LOCAL uint64_t load_4(const unsigned char *in);
wolfSSL 0:d92f9d21154c 79 #endif /* not defined CURVED25519_SMALL */
wolfSSL 0:d92f9d21154c 80
wolfSSL 0:d92f9d21154c 81 /* Use less memory and only 32bit types or less, but is slower
wolfSSL 0:d92f9d21154c 82 Based on Daniel Beer's public domain work. */
wolfSSL 0:d92f9d21154c 83 #ifdef CURVED25519_SMALL
wolfSSL 0:d92f9d21154c 84 static const byte c25519_base_x[F25519_SIZE] = {9};
wolfSSL 0:d92f9d21154c 85 static const byte f25519_zero[F25519_SIZE] = {0};
wolfSSL 0:d92f9d21154c 86 static const byte f25519_one[F25519_SIZE] = {1};
wolfSSL 0:d92f9d21154c 87 static const byte fprime_zero[F25519_SIZE] = {0};
wolfSSL 0:d92f9d21154c 88 static const byte fprime_one[F25519_SIZE] = {1};
wolfSSL 0:d92f9d21154c 89
wolfSSL 0:d92f9d21154c 90 WOLFSSL_LOCAL void fe_load(byte *x, word32 c);
wolfSSL 0:d92f9d21154c 91 WOLFSSL_LOCAL void fe_normalize(byte *x);
wolfSSL 0:d92f9d21154c 92 WOLFSSL_LOCAL void fe_inv__distinct(byte *r, const byte *x);
wolfSSL 0:d92f9d21154c 93
wolfSSL 0:d92f9d21154c 94 /* Conditional copy. If condition == 0, then zero is copied to dst. If
wolfSSL 0:d92f9d21154c 95 * condition == 1, then one is copied to dst. Any other value results in
wolfSSL 0:d92f9d21154c 96 * undefined behaviour.
wolfSSL 0:d92f9d21154c 97 */
wolfSSL 0:d92f9d21154c 98 WOLFSSL_LOCAL void fe_select(byte *dst, const byte *zero, const byte *one,
wolfSSL 0:d92f9d21154c 99 byte condition);
wolfSSL 0:d92f9d21154c 100
wolfSSL 0:d92f9d21154c 101 /* Multiply a point by a small constant. The two pointers are not
wolfSSL 0:d92f9d21154c 102 * required to be distinct.
wolfSSL 0:d92f9d21154c 103 *
wolfSSL 0:d92f9d21154c 104 * The constant must be less than 2^24.
wolfSSL 0:d92f9d21154c 105 */
wolfSSL 0:d92f9d21154c 106 WOLFSSL_LOCAL void fe_mul_c(byte *r, const byte *a, word32 b);
wolfSSL 0:d92f9d21154c 107 WOLFSSL_LOCAL void fe_mul__distinct(byte *r, const byte *a, const byte *b);
wolfSSL 0:d92f9d21154c 108
wolfSSL 0:d92f9d21154c 109 /* Compute one of the square roots of the field element, if the element
wolfSSL 0:d92f9d21154c 110 * is square. The other square is -r.
wolfSSL 0:d92f9d21154c 111 *
wolfSSL 0:d92f9d21154c 112 * If the input is not square, the returned value is a valid field
wolfSSL 0:d92f9d21154c 113 * element, but not the correct answer. If you don't already know that
wolfSSL 0:d92f9d21154c 114 * your element is square, you should square the return value and test.
wolfSSL 0:d92f9d21154c 115 */
wolfSSL 0:d92f9d21154c 116 WOLFSSL_LOCAL void fe_sqrt(byte *r, const byte *x);
wolfSSL 0:d92f9d21154c 117
wolfSSL 0:d92f9d21154c 118 /* Conditional copy. If condition == 0, then zero is copied to dst. If
wolfSSL 0:d92f9d21154c 119 * condition == 1, then one is copied to dst. Any other value results in
wolfSSL 0:d92f9d21154c 120 * undefined behaviour.
wolfSSL 0:d92f9d21154c 121 */
wolfSSL 0:d92f9d21154c 122 WOLFSSL_LOCAL void fprime_select(byte *dst, const byte *zero, const byte *one,
wolfSSL 0:d92f9d21154c 123 byte condition);
wolfSSL 0:d92f9d21154c 124 WOLFSSL_LOCAL void fprime_add(byte *r, const byte *a, const byte *modulus);
wolfSSL 0:d92f9d21154c 125 WOLFSSL_LOCAL void fprime_sub(byte *r, const byte *a, const byte *modulus);
wolfSSL 0:d92f9d21154c 126 WOLFSSL_LOCAL void fprime_mul(byte *r, const byte *a, const byte *b,
wolfSSL 0:d92f9d21154c 127 const byte *modulus);
wolfSSL 0:d92f9d21154c 128 WOLFSSL_LOCAL void fprime_copy(byte *x, const byte *a);
wolfSSL 0:d92f9d21154c 129 #endif /* CURVED25519_SMALL */
wolfSSL 0:d92f9d21154c 130 #endif /* HAVE_CURVE25519 or HAVE_ED25519 */
wolfSSL 0:d92f9d21154c 131 #endif /* WOLF_CRYPT_FE_OPERATIONS_H */
wolfSSL 0:d92f9d21154c 132
wolfSSL 0:d92f9d21154c 133