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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /include/crypto/xts.h
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'include/crypto/xts.h')
-rw-r--r--include/crypto/xts.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/include/crypto/xts.h b/include/crypto/xts.h
new file mode 100644
index 0000000000..15b16c4853
--- /dev/null
+++ b/include/crypto/xts.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _CRYPTO_XTS_H
+#define _CRYPTO_XTS_H
+
+#include <crypto/b128ops.h>
+#include <crypto/internal/skcipher.h>
+#include <linux/fips.h>
+
+#define XTS_BLOCK_SIZE 16
+
+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)
+ return -EINVAL;
+
+ /*
+ * In FIPS mode only a combined key length of either 256 or
+ * 512 bits is allowed, c.f. FIPS 140-3 IG C.I.
+ */
+ if (fips_enabled && keylen != 32 && keylen != 64)
+ return -EINVAL;
+
+ /*
+ * Ensure that the AES and tweak key are not identical when
+ * in FIPS mode or the FORBID_WEAK_KEYS flag is set.
+ */
+ if ((fips_enabled || (crypto_skcipher_get_flags(tfm) &
+ CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)) &&
+ !crypto_memneq(key, key + (keylen / 2), keylen / 2))
+ return -EINVAL;
+
+ return 0;
+}
+
+#endif /* _CRYPTO_XTS_H */