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-rw-r--r--fs/crypto/fscrypt_private.h20
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/crypto/fscrypt_private.h b/fs/crypto/fscrypt_private.h
index 9aae851409e5..dbced2937ec8 100644
--- a/fs/crypto/fscrypt_private.h
+++ b/fs/crypto/fscrypt_private.h
@@ -76,6 +76,26 @@ static inline int fscrypt_context_size(const union fscrypt_context *ctx)
return 0;
}
+/* Check whether an fscrypt_context has a recognized version number and size */
+static inline bool fscrypt_context_is_valid(const union fscrypt_context *ctx,
+ int ctx_size)
+{
+ return ctx_size >= 1 && ctx_size == fscrypt_context_size(ctx);
+}
+
+/* Retrieve the context's nonce, assuming the context was already validated */
+static inline const u8 *fscrypt_context_nonce(const union fscrypt_context *ctx)
+{
+ switch (ctx->version) {
+ case FSCRYPT_CONTEXT_V1:
+ return ctx->v1.nonce;
+ case FSCRYPT_CONTEXT_V2:
+ return ctx->v2.nonce;
+ }
+ WARN_ON(1);
+ return NULL;
+}
+
#undef fscrypt_policy
union fscrypt_policy {
u8 version;