lib/crypto/arm64/sha256.h

Source file repositories/reference/linux-study-clean/lib/crypto/arm64/sha256.h

File Facts

System
Linux kernel
Corpus path
lib/crypto/arm64/sha256.h
Extension
.h
Size
2351 bytes
Lines
75
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

scoped_ksimd() {
			if (static_branch_likely(&have_ce))
				sha256_ce_transform(state, data, nblocks);
			else
				sha256_block_neon(state, data, nblocks);
		}
	} else {
		sha256_block_data_order(state, data, nblocks);
	}
}

static_assert(offsetof(struct __sha256_ctx, state) == 0);
static_assert(offsetof(struct __sha256_ctx, bytecount) == 32);
static_assert(offsetof(struct __sha256_ctx, buf) == 40);
asmlinkage void sha256_ce_finup2x(const struct __sha256_ctx *ctx,
				  const u8 *data1, const u8 *data2, int len,
				  u8 out1[SHA256_DIGEST_SIZE],
				  u8 out2[SHA256_DIGEST_SIZE]);

#define sha256_finup_2x_arch sha256_finup_2x_arch
static bool sha256_finup_2x_arch(const struct __sha256_ctx *ctx,
				 const u8 *data1, const u8 *data2, size_t len,
				 u8 out1[SHA256_DIGEST_SIZE],
				 u8 out2[SHA256_DIGEST_SIZE])
{
	/* The assembly requires len >= SHA256_BLOCK_SIZE && len <= INT_MAX. */
	if (static_branch_likely(&have_ce) && len >= SHA256_BLOCK_SIZE &&
	    len <= INT_MAX && likely(may_use_simd())) {
		scoped_ksimd()
			sha256_ce_finup2x(ctx, data1, data2, len, out1, out2);
		kmsan_unpoison_memory(out1, SHA256_DIGEST_SIZE);
		kmsan_unpoison_memory(out2, SHA256_DIGEST_SIZE);
		return true;
	}
	return false;
}

static bool sha256_finup_2x_is_optimized_arch(void)
{
	return static_key_enabled(&have_ce);
}

#define sha256_mod_init_arch sha256_mod_init_arch
static void sha256_mod_init_arch(void)
{
	if (cpu_have_named_feature(ASIMD)) {
		static_branch_enable(&have_neon);
		if (cpu_have_named_feature(SHA2))
			static_branch_enable(&have_ce);
	}
}

Annotation

Implementation Notes