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Diffstat (limited to 'include/crypto')
-rw-r--r--include/crypto/xts.h26
1 files changed, 24 insertions, 2 deletions
diff --git a/include/crypto/xts.h b/include/crypto/xts.h
index ede6b97b24cc..77b630672b2c 100644
--- a/include/crypto/xts.h
+++ b/include/crypto/xts.h
@@ -2,8 +2,7 @@
#define _CRYPTO_XTS_H
#include <crypto/b128ops.h>
-#include <linux/crypto.h>
-#include <crypto/algapi.h>
+#include <crypto/internal/skcipher.h>
#include <linux/fips.h>
struct scatterlist;
@@ -51,4 +50,27 @@ static inline int xts_check_key(struct crypto_tfm *tfm,
return 0;
}
+static inline int xts_verify_key(struct crypto_skcipher *tfm,
+ const u8 *key, unsigned int keylen)
+{
+ /*
+ * key consists of keys of equal size concatenated, therefore
+ * the length must be even.
+ */
+ if (keylen % 2) {
+ crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+ return -EINVAL;
+ }
+
+ /* ensure that the AES and tweak key are not identical */
+ if ((fips_enabled || crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_WEAK_KEY) &&
+ !crypto_memneq(key, key + (keylen / 2), keylen / 2)) {
+ crypto_skcipher_set_flags(tfm, CRYPTO_TFM_RES_WEAK_KEY);
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
#endif /* _CRYPTO_XTS_H */