fs/crypto/hkdf.c

File Facts

System

Linux kernel

Corpus path

fs/crypto/hkdf.c

Extension

.c

Size

4020 bytes

Lines

101

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• fscrypt_private.h

Detected Declarations

• function HKDF
• function fscrypt_hkdf_expand

Annotated Snippet

if (okmlen - i < HKDF_HASHLEN) {
			hmac_sha512_final(&ctx, tmp);
			memcpy(&okm[i], tmp, okmlen - i);
			memzero_explicit(tmp, sizeof(tmp));
		} else {
			hmac_sha512_final(&ctx, &okm[i]);
		}
		counter++;
	}
}

Annotation

• Immediate include surface: `fscrypt_private.h`.
• Detected declarations: `function HKDF`, `function fscrypt_hkdf_expand`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: source implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.