Ananth Bhaskararaman
769e35369c
Mirrors the existing kdf_ss_derive / kdf_kb_hmac_derive helpers, wrapping OpenSSL's "HKDF" EVP_KDF. Inputs and output are passed as struct iovec; salt and info are optional (pass NULL or an empty iovec to omit). If salt is omitted HKDF substitutes HashLen zero-bytes per RFC 5869. The digest is a parameter now, so reimplement the existing SHA256-only kdf_hkdf_sha256() as a thin wrapper around the new helper, keeping the OpenSSL HKDF plumbing in one place. Add test vectors against RFC 5869 Appendix A.1 and against the kernel's fscrypt v2 master-key identifier construction (HKDF-SHA512 with empty salt and info "fscrypt\x00\x01"), so future consumers can rely on the helper matching that exact derivation.
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