AES-XTS block limit.

[openssl.git] / crypto / modes / modes_lcl.h

diff --git a/crypto/modes/modes_lcl.h b/crypto/modes/modes_lcl.h
index 0517808faf00f35e329a7fd2a545666a16d5cf65..aed79ffb4f9cf449615f226dd8a6b7f752fd6583 100644 (file)
--- a/crypto/modes/modes_lcl.h
+++ b/crypto/modes/modes_lcl.h
@@ -133,6 +133,12 @@ struct gcm128_context {
 #endif
 };
 
+/*
+ * The maximum permitted number of cipher blocks per data unit in XTS mode.
+ * Reference IEEE Std 1619-2018.
+ */
+#define XTS_MAX_BLOCKS_PER_DATA_UNIT            (1<<20)
+
 struct xts128_context {
     void *key1, *key2;
     block128_f block1, block2;