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author | Richard Henderson <richard.henderson@linaro.org> | 2023-07-10 15:38:28 +0100 |
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committer | Richard Henderson <richard.henderson@linaro.org> | 2023-09-15 13:56:59 +0000 |
commit | 07f348d77c35b6ff1f99075e20bffbf67e772d8b (patch) | |
tree | c494a756066e9c2a880d6e5c23897943d7e834da | |
parent | 005ad32358f12fe9313a4a01918a55e60d4f39e5 (diff) | |
download | qemu-07f348d77c35b6ff1f99075e20bffbf67e772d8b.zip qemu-07f348d77c35b6ff1f99075e20bffbf67e772d8b.tar.gz qemu-07f348d77c35b6ff1f99075e20bffbf67e772d8b.tar.bz2 |
crypto: Add generic 8-bit carry-less multiply routines
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
-rw-r--r-- | crypto/clmul.c | 60 | ||||
-rw-r--r-- | crypto/meson.build | 9 | ||||
-rw-r--r-- | include/crypto/clmul.h | 41 |
3 files changed, 107 insertions, 3 deletions
diff --git a/crypto/clmul.c b/crypto/clmul.c new file mode 100644 index 0000000..82d873f --- /dev/null +++ b/crypto/clmul.c @@ -0,0 +1,60 @@ +/* + * Carry-less multiply operations. + * SPDX-License-Identifier: GPL-2.0-or-later + * + * Copyright (C) 2023 Linaro, Ltd. + */ + +#include "qemu/osdep.h" +#include "crypto/clmul.h" + +uint64_t clmul_8x8_low(uint64_t n, uint64_t m) +{ + uint64_t r = 0; + + for (int i = 0; i < 8; ++i) { + uint64_t mask = (n & 0x0101010101010101ull) * 0xff; + r ^= m & mask; + m = (m << 1) & 0xfefefefefefefefeull; + n >>= 1; + } + return r; +} + +static uint64_t clmul_8x4_even_int(uint64_t n, uint64_t m) +{ + uint64_t r = 0; + + for (int i = 0; i < 8; ++i) { + uint64_t mask = (n & 0x0001000100010001ull) * 0xffff; + r ^= m & mask; + n >>= 1; + m <<= 1; + } + return r; +} + +uint64_t clmul_8x4_even(uint64_t n, uint64_t m) +{ + n &= 0x00ff00ff00ff00ffull; + m &= 0x00ff00ff00ff00ffull; + return clmul_8x4_even_int(n, m); +} + +uint64_t clmul_8x4_odd(uint64_t n, uint64_t m) +{ + return clmul_8x4_even(n >> 8, m >> 8); +} + +static uint64_t unpack_8_to_16(uint64_t x) +{ + return (x & 0x000000ff) + | ((x & 0x0000ff00) << 8) + | ((x & 0x00ff0000) << 16) + | ((x & 0xff000000) << 24); +} + +uint64_t clmul_8x4_packed(uint32_t n, uint32_t m) +{ + return clmul_8x4_even_int(unpack_8_to_16(n), unpack_8_to_16(m)); +} diff --git a/crypto/meson.build b/crypto/meson.build index 5f03a30..9ac1a89 100644 --- a/crypto/meson.build +++ b/crypto/meson.build @@ -48,9 +48,12 @@ if have_afalg endif crypto_ss.add(when: gnutls, if_true: files('tls-cipher-suites.c')) -util_ss.add(files('sm4.c')) -util_ss.add(files('aes.c')) -util_ss.add(files('init.c')) +util_ss.add(files( + 'aes.c', + 'clmul.c', + 'init.c', + 'sm4.c', +)) if gnutls.found() util_ss.add(gnutls) endif diff --git a/include/crypto/clmul.h b/include/crypto/clmul.h new file mode 100644 index 0000000..153b5e3 --- /dev/null +++ b/include/crypto/clmul.h @@ -0,0 +1,41 @@ +/* + * Carry-less multiply operations. + * SPDX-License-Identifier: GPL-2.0-or-later + * + * Copyright (C) 2023 Linaro, Ltd. + */ + +#ifndef CRYPTO_CLMUL_H +#define CRYPTO_CLMUL_H + +/** + * clmul_8x8_low: + * + * Perform eight 8x8->8 carry-less multiplies. + */ +uint64_t clmul_8x8_low(uint64_t, uint64_t); + +/** + * clmul_8x4_even: + * + * Perform four 8x8->16 carry-less multiplies. + * The odd bytes of the inputs are ignored. + */ +uint64_t clmul_8x4_even(uint64_t, uint64_t); + +/** + * clmul_8x4_odd: + * + * Perform four 8x8->16 carry-less multiplies. + * The even bytes of the inputs are ignored. + */ +uint64_t clmul_8x4_odd(uint64_t, uint64_t); + +/** + * clmul_8x4_packed: + * + * Perform four 8x8->16 carry-less multiplies. + */ +uint64_t clmul_8x4_packed(uint32_t, uint32_t); + +#endif /* CRYPTO_CLMUL_H */ |