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crypto: cfb - fix decryption

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commit fa4600734b74f74d9169c3015946d4722f8bcf79 upstream.

crypto_cfb_decrypt_segment() incorrectly XOR'ed generated keystream with
IV, rather than with data stream, resulting in incorrect decryption.
Test vectors will be added in the next patch.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>
Cc: stable@vger.kernel.org
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Dmitry Eremin-Solenikov
2018-10-20 02:01:52 +03:00
committed by Greg Kroah-Hartman
parent d8e4b24ffb
commit 99dcd45f27
1 changed files with 1 additions and 1 deletions
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2
crypto/cfb.c
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@ -144,7 +144,7 @@ static int crypto_cfb_decrypt_segment(struct skcipher_walk *walk,
do { do {
crypto_cfb_encrypt_one(tfm, iv, dst); crypto_cfb_encrypt_one(tfm, iv, dst);
crypto_xor(dst, iv, bsize); crypto_xor(dst, src, bsize);
iv = src; iv = src;
src += bsize; src += bsize;