mirror of
https://github.com/trezor/trezor-firmware.git
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116 lines
2.7 KiB
C
116 lines
2.7 KiB
C
/*
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Public domain by Andrew M. <liquidsun@gmail.com>
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Modified from the amd64-51-30k implementation by
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Daniel J. Bernstein
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Niels Duif
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Tanja Lange
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Peter Schwabe
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Bo-Yin Yang
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*/
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#include "ed25519-donna-portable.h"
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#if defined(ED25519_SSE2)
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#else
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#if defined(HAVE_UINT128) && !defined(ED25519_FORCE_32BIT)
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#define ED25519_64BIT
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#else
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#define ED25519_32BIT
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#endif
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#endif
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#if !defined(ED25519_NO_INLINE_ASM)
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/* detect extra features first so un-needed functions can be disabled throughout */
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#if defined(ED25519_SSE2)
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#if defined(COMPILER_GCC) && defined(CPU_X86)
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#define ED25519_GCC_32BIT_SSE_CHOOSE
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#elif defined(COMPILER_GCC) && defined(CPU_X86_64)
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#define ED25519_GCC_64BIT_SSE_CHOOSE
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#endif
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#else
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#if defined(CPU_X86_64)
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#if defined(COMPILER_GCC)
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#if defined(ED25519_64BIT)
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#define ED25519_GCC_64BIT_X86_CHOOSE
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#else
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#define ED25519_GCC_64BIT_32BIT_CHOOSE
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#endif
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#endif
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#endif
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#endif
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#endif
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#if defined(ED25519_SSE2)
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#include "curve25519-donna-sse2.h"
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#elif defined(ED25519_64BIT)
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#include "curve25519-donna-64bit.h"
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#else
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#include "curve25519-donna-32bit.h"
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#endif
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#include "curve25519-donna-helpers.h"
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/* separate uint128 check for 64 bit sse2 */
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#if defined(HAVE_UINT128) && !defined(ED25519_FORCE_32BIT)
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#include "modm-donna-64bit.h"
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#else
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#include "modm-donna-32bit.h"
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#endif
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typedef unsigned char hash_512bits[64];
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/*
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Timing safe memory compare
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*/
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static int
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ed25519_verify(const unsigned char *x, const unsigned char *y, size_t len) {
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size_t differentbits = 0;
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while (len--)
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differentbits |= (*x++ ^ *y++);
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return (int) (1 & ((differentbits - 1) >> 8));
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}
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/*
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* Arithmetic on the twisted Edwards curve -x^2 + y^2 = 1 + dx^2y^2
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* with d = -(121665/121666) = 37095705934669439343138083508754565189542113879843219016388785533085940283555
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* Base point: (15112221349535400772501151409588531511454012693041857206046113283949847762202,46316835694926478169428394003475163141307993866256225615783033603165251855960);
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*/
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typedef struct ge25519_t {
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bignum25519 x, y, z, t;
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} ge25519;
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typedef struct ge25519_p1p1_t {
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bignum25519 x, y, z, t;
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} ge25519_p1p1;
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typedef struct ge25519_niels_t {
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bignum25519 ysubx, xaddy, t2d;
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} ge25519_niels;
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typedef struct ge25519_pniels_t {
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bignum25519 ysubx, xaddy, z, t2d;
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} ge25519_pniels;
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#include "ed25519-donna-basepoint-table.h"
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#if defined(ED25519_64BIT)
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#include "ed25519-donna-64bit-tables.h"
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#include "ed25519-donna-64bit-x86.h"
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#else
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#include "ed25519-donna-32bit-tables.h"
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#include "ed25519-donna-64bit-x86-32bit.h"
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#endif
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#if defined(ED25519_SSE2)
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#include "ed25519-donna-32bit-sse2.h"
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#include "ed25519-donna-64bit-sse2.h"
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#include "ed25519-donna-impl-sse2.h"
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#else
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#include "ed25519-donna-impl-base.h"
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#endif
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