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ghash: add pmull support on aarch64

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This commit is contained in:
Frank Denis 2020-10-02 21:16:18 +02:00 committed by Andrew Kelley
parent 83eda21488
commit 1bc2b68916
1 changed files with 19 additions and 1 deletions
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20
lib/std/crypto/ghash.zig
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@ -105,6 +105,17 @@ pub const Ghash = struct {
return product[0];
}
inline fn clmul_pmull(x: u64, y: u64) u64 {
const Vector = std.meta.Vector;
const product = asm (
\\ pmull %[out].1q, %[x].1d, %[y].1d
: [out] "=w" (-> Vector(2, u64))
: [x] "w" (@bitCast(Vector(2, u64), @as(u128, x))),
[y] "w" (@bitCast(Vector(2, u64), @as(u128, y)))
);
return product[0];
}
fn clmul_soft(x: u64, y: u64) u64 {
const x0 = x & 0x1111111111111111;
const x1 = x & 0x2222222222222222;
@ -127,7 +138,14 @@ pub const Ghash = struct {
const has_pclmul = comptime std.Target.x86.featureSetHas(std.Target.current.cpu.features, .pclmul);
const has_avx = comptime std.Target.x86.featureSetHas(std.Target.current.cpu.features, .avx);
const clmul = if (std.Target.current.cpu.arch == .x86_64 and has_pclmul and has_avx) clmul_pclmul else clmul_soft;
const has_armaes = comptime std.Target.aarch64.featureSetHas(std.Target.current.cpu.features, .aes);
const clmul = if (std.Target.current.cpu.arch == .x86_64 and has_pclmul and has_avx) impl: {
break :impl clmul_pclmul;
} else if (std.Target.current.cpu.arch == .aarch64 and has_armaes) impl: {
break :impl clmul_pmull;
} else impl: {
break :impl clmul_soft;
};
fn blocks(st: *Ghash, msg: []const u8) void {
assert(msg.len % 16 == 0); // GHASH blocks() expects full blocks