lib/crypto/arm64/poly1305.h

Source file repositories/reference/linux-study-clean/lib/crypto/arm64/poly1305.h

File Facts

System
Linux kernel
Corpus path
lib/crypto/arm64/poly1305.h
Extension
.h
Size
1353 bytes
Lines
43
Domain
Kernel Services
Bucket
lib
Inferred role
Kernel Services: implementation source
Status
source implementation candidate

Why This File Exists

Shared kernel service surface used by multiple subsystems, including helpers, cryptography, virtualization support, and async I/O infrastructure.

Dependency Surface

Detected Declarations

Annotated Snippet

#include <asm/hwcap.h>
#include <asm/simd.h>
#include <linux/cpufeature.h>
#include <linux/jump_label.h>
#include <linux/kernel.h>

asmlinkage void poly1305_block_init(struct poly1305_block_state *state,
				    const u8 raw_key[POLY1305_BLOCK_SIZE]);
asmlinkage void poly1305_blocks_arm64(struct poly1305_block_state *state,
				      const u8 *src, u32 len, u32 hibit);
asmlinkage void poly1305_blocks_neon(struct poly1305_block_state *state,
				     const u8 *src, u32 len, u32 hibit);
asmlinkage void poly1305_emit(const struct poly1305_state *state,
			      u8 digest[POLY1305_DIGEST_SIZE],
			      const u32 nonce[4]);

static __ro_after_init DEFINE_STATIC_KEY_FALSE(have_neon);

static void poly1305_blocks(struct poly1305_block_state *state, const u8 *src,
			    unsigned int len, u32 padbit)
{
	if (static_branch_likely(&have_neon) && likely(may_use_simd())) {
		scoped_ksimd()
			poly1305_blocks_neon(state, src, len, padbit);
	} else {
		poly1305_blocks_arm64(state, src, len, padbit);
	}
}

#define poly1305_mod_init_arch poly1305_mod_init_arch
static void poly1305_mod_init_arch(void)
{
	if (cpu_have_named_feature(ASIMD))
		static_branch_enable(&have_neon);
}

Annotation

Implementation Notes