[CRYPTO] xts: XTS blockcipher mode implementation without partial blocks
XTS currently considered to be the successor of the LRW mode by the IEEE1619
workgroup. LRW was discarded, because it was not secure if the encyption key
itself is encrypted with LRW.
XTS does not have this problem. The implementation is pretty straightforward,
a new function was added to gf128mul to handle GF(128) elements in ble format.
Four testvectors from the specification
http://grouper.ieee.org/groups/1619/email/pdf00086.pdf
were added, and they verify on my system.
Signed-off-by: Rik Snel <rsnel@cube.dyndns.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
diff --git a/crypto/tcrypt.c b/crypto/tcrypt.c
index de6435e..18d489c 100644
--- a/crypto/tcrypt.c
+++ b/crypto/tcrypt.c
@@ -955,6 +955,10 @@
AES_LRW_ENC_TEST_VECTORS);
test_cipher("lrw(aes)", DECRYPT, aes_lrw_dec_tv_template,
AES_LRW_DEC_TEST_VECTORS);
+ test_cipher("xts(aes)", ENCRYPT, aes_xts_enc_tv_template,
+ AES_XTS_ENC_TEST_VECTORS);
+ test_cipher("xts(aes)", DECRYPT, aes_xts_dec_tv_template,
+ AES_XTS_DEC_TEST_VECTORS);
//CAST5
test_cipher("ecb(cast5)", ENCRYPT, cast5_enc_tv_template,
@@ -1138,6 +1142,10 @@
AES_LRW_ENC_TEST_VECTORS);
test_cipher("lrw(aes)", DECRYPT, aes_lrw_dec_tv_template,
AES_LRW_DEC_TEST_VECTORS);
+ test_cipher("xts(aes)", ENCRYPT, aes_xts_enc_tv_template,
+ AES_XTS_ENC_TEST_VECTORS);
+ test_cipher("xts(aes)", DECRYPT, aes_xts_dec_tv_template,
+ AES_XTS_DEC_TEST_VECTORS);
break;
case 11:
@@ -1313,6 +1321,10 @@
aes_lrw_speed_template);
test_cipher_speed("lrw(aes)", DECRYPT, sec, NULL, 0,
aes_lrw_speed_template);
+ test_cipher_speed("xts(aes)", ENCRYPT, sec, NULL, 0,
+ aes_xts_speed_template);
+ test_cipher_speed("xts(aes)", DECRYPT, sec, NULL, 0,
+ aes_xts_speed_template);
break;
case 201:
