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authorDaniele Alessandrelli <daniele.alessandrelli@intel.com>2021-02-03 18:42:10 +0300
committerHerbert Xu <herbert@gondor.apana.org.au>2021-02-10 09:55:59 +0300
commit0db5bc85c5d871188b6f66ee26bc712a309a4a3d (patch)
tree66a1a3c0561a72d86e6a4b96d5e86b5210e9fa63 /drivers/crypto
parentcfb28fde083761bfb839bc53059068bab5634b6a (diff)
downloadlinux-0db5bc85c5d871188b6f66ee26bc712a309a4a3d.tar.xz
crypto: keembay-ocs-aes - Fix 'q' assignment during CCM B0 generation
In ocs_aes_ccm_write_b0(), 'q' (the octet length of the binary representation of the octet length of the payload) is set to 'iv[0]', while it should be set to 'iv[0] & 0x7' (i.e., only the last 3 bits of iv[0] should be used), as documented in NIST Special Publication 800-38C: https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-38c.pdf In practice, this is not an issue, since 'iv[0]' is checked to be in the range [1-7] by ocs_aes_validate_inputs(), but let's fix the assignment anyway, in order to make the code more robust. Signed-off-by: Daniele Alessandrelli <daniele.alessandrelli@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'drivers/crypto')
-rw-r--r--drivers/crypto/keembay/ocs-aes.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/crypto/keembay/ocs-aes.c b/drivers/crypto/keembay/ocs-aes.c
index b85c89477afa..be9f32fc8f42 100644
--- a/drivers/crypto/keembay/ocs-aes.c
+++ b/drivers/crypto/keembay/ocs-aes.c
@@ -1080,15 +1080,15 @@ static int ocs_aes_ccm_write_b0(const struct ocs_aes_dev *aes_dev,
/*
* q is the octet length of Q.
* q can only be an element of {2, 3, 4, 5, 6, 7, 8} and is encoded as
- * q - 1 == iv[0]
+ * q - 1 == iv[0] & 0x7;
*/
b0[0] |= iv[0] & 0x7;
/*
* Copy the Nonce N from IV to B0; N is located in iv[1]..iv[15 - q]
* and must be copied to b0[1]..b0[15-q].
- * q == iv[0] + 1
+ * q == (iv[0] & 0x7) + 1
*/
- q = iv[0] + 1;
+ q = (iv[0] & 0x7) + 1;
for (i = 1; i <= 15 - q; i++)
b0[i] = iv[i];
/*