feat(format): rename default prefix from ak to ak_v1 for versioned key format#28
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…enumeration OWASP API2:2023: move hash verification before ensure_valid() so a caller with a wrong secret always receives 401 InvalidKey, regardless of whether the key is inactive or expired. Adds regression test and updates mermaid flow diagrams to reflect the STATE_CHECK step after COMPARE. Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
…re-hashing Bcrypt silently truncates input at 72 bytes. Concatenating key_secret (64 chars) with a pepper could push the combined string past that limit, causing the tail characters to be ignored — two distinct secrets could produce the same hash. Fix: _apply_pepper() now computes HMAC-SHA256(pepper, secret), producing a fixed 32-byte digest that is always well within bcrypt's input limit. The pepper remains cryptographically bound to the secret as the HMAC key. This is a breaking change: hashes stored under the old concatenation scheme will not verify with the new implementation; affected keys must be re-issued. Also updates README, docs/index.md, and docs/schema.mermaid to document the NIST SP 800-132 compliance entry, the OWASP API2:2023 bullet (missing from docs/index.md), the STATE_CHECK node (missing from the docs/index.md diagram), and the NOTE_ARGON annotation to cover both Argon2 and Bcrypt strategies. Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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