diff options
Diffstat (limited to 'crypto/ec/curve448/arch_32/f_impl32.c')
-rw-r--r-- | crypto/ec/curve448/arch_32/f_impl32.c | 104 |
1 files changed, 104 insertions, 0 deletions
diff --git a/crypto/ec/curve448/arch_32/f_impl32.c b/crypto/ec/curve448/arch_32/f_impl32.c new file mode 100644 index 0000000000..812c06d84a --- /dev/null +++ b/crypto/ec/curve448/arch_32/f_impl32.c @@ -0,0 +1,104 @@ +/* + * Copyright 2017-2021 The OpenSSL Project Authors. All Rights Reserved. + * Copyright 2014 Cryptography Research, Inc. + * + * Licensed under the Apache License 2.0 (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + * + * Originally written by Mike Hamburg + */ + +#include "openssl/macros.h" +#include "internal/numbers.h" + +#ifdef UINT128_MAX +/* We have support for 128 bit ints, so do nothing here */ +NON_EMPTY_TRANSLATION_UNIT +#else + +# include "../field.h" + +void gf_mul(gf_s * RESTRICT cs, const gf as, const gf bs) +{ + const uint32_t *a = as->limb, *b = bs->limb; + uint32_t *c = cs->limb; + uint64_t accum0 = 0, accum1 = 0, accum2 = 0; + uint32_t mask = (1 << 28) - 1; + uint32_t aa[8], bb[8]; + int i, j; + + for (i = 0; i < 8; i++) { + aa[i] = a[i] + a[i + 8]; + bb[i] = b[i] + b[i + 8]; + } + + for (j = 0; j < 8; j++) { + accum2 = 0; + for (i = 0; i < j + 1; i++) { + accum2 += widemul(a[j - i], b[i]); + accum1 += widemul(aa[j - i], bb[i]); + accum0 += widemul(a[8 + j - i], b[8 + i]); + } + accum1 -= accum2; + accum0 += accum2; + accum2 = 0; + for (i = j + 1; i < 8; i++) { + accum0 -= widemul(a[8 + j - i], b[i]); + accum2 += widemul(aa[8 + j - i], bb[i]); + accum1 += widemul(a[16 + j - i], b[8 + i]); + } + accum1 += accum2; + accum0 += accum2; + c[j] = ((uint32_t)(accum0)) & mask; + c[j + 8] = ((uint32_t)(accum1)) & mask; + accum0 >>= 28; + accum1 >>= 28; + } + + accum0 += accum1; + accum0 += c[8]; + accum1 += c[0]; + c[8] = ((uint32_t)(accum0)) & mask; + c[0] = ((uint32_t)(accum1)) & mask; + + accum0 >>= 28; + accum1 >>= 28; + c[9] += ((uint32_t)(accum0)); + c[1] += ((uint32_t)(accum1)); +} + +void gf_mulw_unsigned(gf_s * RESTRICT cs, const gf as, uint32_t b) +{ + const uint32_t *a = as->limb; + uint32_t *c = cs->limb; + uint64_t accum0 = 0, accum8 = 0; + uint32_t mask = (1 << 28) - 1; + int i; + + assert(b <= mask); + + for (i = 0; i < 8; i++) { + accum0 += widemul(b, a[i]); + accum8 += widemul(b, a[i + 8]); + c[i] = accum0 & mask; + accum0 >>= 28; + c[i + 8] = accum8 & mask; + accum8 >>= 28; + } + + accum0 += accum8 + c[8]; + c[8] = ((uint32_t)accum0) & mask; + c[9] += (uint32_t)(accum0 >> 28); + + accum8 += c[0]; + c[0] = ((uint32_t)accum8) & mask; + c[1] += (uint32_t)(accum8 >> 28); +} + +void gf_sqr(gf_s * RESTRICT cs, const gf as) +{ + gf_mul(cs, as, as); /* Performs better with a dedicated square */ +} +#endif |