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[CRYPTO] xts: XTS blockcipher mode implementation without partial blocks

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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 <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
This commit is contained in:
Rik Snel 2007-09-19 20:23:13 +08:00 • committed by David S. Miller
commit f19f5111c9
7 changed files with 746 additions and 0 deletions
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12
crypto/tcrypt.c
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@ -955,6 +955,10 @@ static void do_test(void)
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 @@ static void do_test(void)
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 @@ static void do_test(void)
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: