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Diffstat (limited to 'fs/crypto/policy.c')
-rw-r--r--fs/crypto/policy.c20
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)
{