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This commit adds in the FindPolicyKey and RemovePolicyKey functions to
complement the InsertPolicyKey function. The existing functions were
also refactored slightly.
Change-Id: Iabd275f2186a9e3023d5efd44c772966123e3657
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This changes the crypto package so it now builds in light of the changes
to the util and metadata package. This commit also improves the error
handling, adds tests, and makes it so recovery keys now correspond to
Policy keys (as they are used to recover a directory in the absence of
any metadata).
The only feature addition here is the ability to compute descriptors.
For backwards compatibility, we keep the same descriptor algorithm used
before (double SHA512).
Change-Id: Ia2b53c6e85ce65c57595e6823d3c4c92219bc8dc
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This commit adds in the PassphraseHash function which hashes the
provided passphrase (in key form) using Argon2id. This cost parameters
for Argon2id and that salt are both fed into the function. It also
includes tests and benchmarks for the passphrase hashing.
Change-Id: I060db3e71213c756d45ce5603a0a59d3d7a1e609
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This commit adds in the ability to use the WrappedKeyData from the
metadata package to wrap and unwrap cryptographic keys of any length.
This makes use of several cryptographic primitives:
- Unsalted, SHA256-based HKDF for key stretching
- AES256 in CTR mode for encryption
- SHA256-based HMAC for authentication
Note that the key wrapping/unwrapping uses an "Encrypt then MAC" scheme
for doing authenticated unwrapping. This means we can detect if bogus
metadata has been given. This package also standardizes the length for
fscrypt's internal keys.
This CL is the first to add benchmarks, which can be run with:
go test -bench=. ./...
Change-Id: I2e5fc23a8a8cc36b17ccb3f26f03edcaccc517e1
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