| Message ID | 20230821161854.419893-6-richard.henderson@linaro.org |
|---|---|
| State | Superseded |
| Headers | show |
| Series | crypto: Provide clmul.h and host accel | expand |
On Mon, 21 Aug 2023 at 18:19, Richard Henderson <richard.henderson@linaro.org> wrote: > > Signed-off-by: Richard Henderson <richard.henderson@linaro.org> > --- > include/crypto/clmul.h | 16 ++++++++++++++++ > crypto/clmul.c | 21 +++++++++++++++++++++ > 2 files changed, 37 insertions(+) > > diff --git a/include/crypto/clmul.h b/include/crypto/clmul.h > index 153b5e3057..c7ad28aa85 100644 > --- a/include/crypto/clmul.h > +++ b/include/crypto/clmul.h > @@ -38,4 +38,20 @@ uint64_t clmul_8x4_odd(uint64_t, uint64_t); > */ > uint64_t clmul_8x4_packed(uint32_t, uint32_t); > > +/** > + * clmul_16x2_even: > + * > + * Perform two 16x16->32 carry-less multiplies. > + * The odd words of the inputs are ignored. > + */ > +uint64_t clmul_16x2_even(uint64_t, uint64_t); > + > +/** > + * clmul_16x2_odd: > + * > + * Perform two 16x16->32 carry-less multiplies. > + * The even bytes of the inputs are ignored. even words Reviewed-by: Ard Biesheuvel <ardb@kernel.org> > + */ > +uint64_t clmul_16x2_odd(uint64_t, uint64_t); > + > #endif /* CRYPTO_CLMUL_H */ > diff --git a/crypto/clmul.c b/crypto/clmul.c > index 82d873fee5..2c87cfbf8a 100644 > --- a/crypto/clmul.c > +++ b/crypto/clmul.c > @@ -58,3 +58,24 @@ 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)); > } > + > +uint64_t clmul_16x2_even(uint64_t n, uint64_t m) > +{ > + uint64_t r = 0; > + > + n &= 0x0000ffff0000ffffull; > + m &= 0x0000ffff0000ffffull; > + > + for (int i = 0; i < 16; ++i) { > + uint64_t mask = (n & 0x0000000100000001ull) * 0xffffffffull; > + r ^= m & mask; > + n >>= 1; > + m <<= 1; > + } > + return r; > +} > + > +uint64_t clmul_16x2_odd(uint64_t n, uint64_t m) > +{ > + return clmul_16x2_even(n >> 16, m >> 16); > +} > -- > 2.34.1 >
diff --git a/include/crypto/clmul.h b/include/crypto/clmul.h index 153b5e3057..c7ad28aa85 100644 --- a/include/crypto/clmul.h +++ b/include/crypto/clmul.h @@ -38,4 +38,20 @@ uint64_t clmul_8x4_odd(uint64_t, uint64_t); */ uint64_t clmul_8x4_packed(uint32_t, uint32_t); +/** + * clmul_16x2_even: + * + * Perform two 16x16->32 carry-less multiplies. + * The odd words of the inputs are ignored. + */ +uint64_t clmul_16x2_even(uint64_t, uint64_t); + +/** + * clmul_16x2_odd: + * + * Perform two 16x16->32 carry-less multiplies. + * The even bytes of the inputs are ignored. + */ +uint64_t clmul_16x2_odd(uint64_t, uint64_t); + #endif /* CRYPTO_CLMUL_H */ diff --git a/crypto/clmul.c b/crypto/clmul.c index 82d873fee5..2c87cfbf8a 100644 --- a/crypto/clmul.c +++ b/crypto/clmul.c @@ -58,3 +58,24 @@ 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)); } + +uint64_t clmul_16x2_even(uint64_t n, uint64_t m) +{ + uint64_t r = 0; + + n &= 0x0000ffff0000ffffull; + m &= 0x0000ffff0000ffffull; + + for (int i = 0; i < 16; ++i) { + uint64_t mask = (n & 0x0000000100000001ull) * 0xffffffffull; + r ^= m & mask; + n >>= 1; + m <<= 1; + } + return r; +} + +uint64_t clmul_16x2_odd(uint64_t n, uint64_t m) +{ + return clmul_16x2_even(n >> 16, m >> 16); +}
Signed-off-by: Richard Henderson <richard.henderson@linaro.org> --- include/crypto/clmul.h | 16 ++++++++++++++++ crypto/clmul.c | 21 +++++++++++++++++++++ 2 files changed, 37 insertions(+)