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crypto: ccp - Ignore tag length when decrypting GCM ciphertext 

AES GCM input buffers for decryption contain AAD+CTEXT+TAG. Only
decrypt the ciphertext, and use the tag for comparison.

Fixes: 36cf515b9b ("crypto: ccp - Enable support for AES GCM on v5 CCPs")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gary R Hook <gary.hook@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Gary R Hook 2019-07-30 16:05:26 +00:00 committed by Herbert Xu
parent 9f00baf74e
commit e2664ecbb2
1 changed files with 1 additions and 2 deletions
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3
drivers/crypto/ccp/ccp-ops.c
View File

@ -782,8 +782,7 @@ static int ccp_run_aes_gcm_cmd(struct ccp_cmd_queue *cmd_q,
while (src.sg_wa.bytes_left) {
ccp_prepare_data(&src, &dst, &op, AES_BLOCK_SIZE, true);
if (!src.sg_wa.bytes_left) {
unsigned int nbytes = aes->src_len
% AES_BLOCK_SIZE;
unsigned int nbytes = ilen % AES_BLOCK_SIZE;
if (nbytes) {
op.eom = 1;