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| author | Eric Biggers <ebiggers@google.com> | 2022-04-30 22:08:53 -0700 |
|---|---|---|
| committer | Eric Biggers <ebiggers@google.com> | 2022-05-09 16:18:54 -0700 |
| commit | bfb9700bdf35417454a9bb8b67221d89d7c6e75a (patch) | |
| tree | f9644b43e0dee61186f19064ad432b0341ae5ef9 /fs/crypto/policy.c | |
| parent | a7a5bc5fe8acc9381e38a34ef18f1115c5c22079 (diff) | |
| download | lwn-bfb9700bdf35417454a9bb8b67221d89d7c6e75a.tar.gz lwn-bfb9700bdf35417454a9bb8b67221d89d7c6e75a.zip | |
fscrypt: factor out fscrypt_policy_to_key_spec()
Factor out a function that builds the fscrypt_key_specifier for an
fscrypt_policy. Before this was only needed when finding the key for a
file, but now it will also be needed for test_dummy_encryption support.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Link: https://lore.kernel.org/r/20220501050857.538984-4-ebiggers@kernel.org
Diffstat (limited to 'fs/crypto/policy.c')
| -rw-r--r-- | fs/crypto/policy.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/crypto/policy.c b/fs/crypto/policy.c index ed3d623724cd..2a11276913a9 100644 --- a/fs/crypto/policy.c +++ b/fs/crypto/policy.c @@ -32,6 +32,26 @@ bool fscrypt_policies_equal(const union fscrypt_policy *policy1, return !memcmp(policy1, policy2, fscrypt_policy_size(policy1)); } +int fscrypt_policy_to_key_spec(const union fscrypt_policy *policy, + struct fscrypt_key_specifier *key_spec) +{ + switch (policy->version) { + case FSCRYPT_POLICY_V1: + key_spec->type = FSCRYPT_KEY_SPEC_TYPE_DESCRIPTOR; + memcpy(key_spec->u.descriptor, policy->v1.master_key_descriptor, + FSCRYPT_KEY_DESCRIPTOR_SIZE); + return 0; + case FSCRYPT_POLICY_V2: + key_spec->type = FSCRYPT_KEY_SPEC_TYPE_IDENTIFIER; + memcpy(key_spec->u.identifier, policy->v2.master_key_identifier, + FSCRYPT_KEY_IDENTIFIER_SIZE); + return 0; + default: + WARN_ON(1); + return -EINVAL; + } +} + static const union fscrypt_policy * fscrypt_get_dummy_policy(struct super_block *sb) { |