Add native HKDF bindings - #525
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Expose HkdfSuite configured with MessageDigest, returning allocation-free DigestBytes from extract and filling caller-provided output buffers during expand. Preserve BoringSSL errors and enforce RFC 5869 PRK and output-length requirements. Cover RFC SHA-1 and SHA-256 vectors, independent SHA-384 and SHA-512 vectors, empty inputs, block boundaries, digest-dependent output limits, and short and long PRKs. Document RFC argument semantics.
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HkdfSuite, configured withMessageDigest, for RFC 5869 extraction and expansion using BoringSSL’s native HKDF functions.Extraction returns allocation-free
DigestBytes. Expansion fills a caller-provided buffer, accepts PRKs of at least the digest output length, and enforces the RFC output limit. Both operations returnErrorStackon failure.Tests cover RFC SHA-1/SHA-256 vectors, independent SHA-384/SHA-512 vectors, empty inputs, block boundaries, output limits, and short/long PRKs. A tested example derives an AES-256-GCM key and uses it to encrypt and decrypt a message.