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# Which Problems Are Solved - Upgrading to `zitadel/passwap` v0.12.1 introduced new encoded-hash validation paths that still had review feedback open. - Secret hasher defaults were internally inconsistent (`Hasher.Cost: 4` vs `Limits.Bcrypt.MinCost: 10`), which could reject hashes created by the configured hasher. - New validation error IDs/messages and test coverage needed to be aligned with project conventions and expected behavior branches. # How the Problems Are Solved - Kept the dependency upgrade to `zitadel/passwap` v0.12.1 and completed the validation integration. - Updated `ValidateEncodedHash` error handling in `internal/crypto/passwap.go` to: - use unique random-style error IDs, - return `Errors.Hash.NotSupported` for no-verifier cases, - keep invalid-hash branches mapped to invalid argument errors. - Expanded `TestHasher_ValidateEncodedHash` in `internal/crypto/passwap_test.go` to cover and assert: - bounds error branch, - no-verifier branch, - generic invalid-hash branch, - expected ZITADEL error IDs/messages. - Restored lost inline verifier-context comments for argon2 and md5plain verifier entries. # Additional Changes - Added the missing explanatory `Limits` comment for `SecretHasher` in `cmd/defaults.yaml`. - Corrected `SecretHasher.Limits.Bcrypt.MinCost` from `10` to `4` to match the configured default bcrypt cost and avoid configuration footguns. # Additional Context - Follow-up for PR review feedback in https://github.com/zitadel/zitadel/pull/12179#pullrequestreview-4313121965 --------- Co-authored-by: copilot-swe-agent[bot] <[email protected]> Co-authored-by: Livio Spring <[email protected]>