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crypto: chelsio - Update IV before sending request to HW 

CBC Decryption requires Last Block as IV. In case src/dst buffer
are same last block will be replaced by plain text. This patch copies
the Last Block before sending request to HW.

Signed-off-by: Harsh Jain <harsh@chelsio.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Harsh Jain 2018-03-06 10:37:50 +05:30 committed by Herbert Xu
parent 1d693cf650
commit 5fb78dba16
1 changed files with 11 additions and 8 deletions
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19
drivers/crypto/chelsio/chcr_algo.c
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@ -854,6 +854,13 @@ static struct sk_buff *create_cipher_wr(struct cipher_wr_param *wrparam)
transhdr_len, temp,
ablkctx->ciph_mode == CHCR_SCMD_CIPHER_MODE_AES_CBC);
reqctx->skb = skb;
if (reqctx->op && (ablkctx->ciph_mode ==
CHCR_SCMD_CIPHER_MODE_AES_CBC))
sg_pcopy_to_buffer(wrparam->req->src,
sg_nents(wrparam->req->src), wrparam->req->info, 16,
reqctx->processed + wrparam->bytes - AES_BLOCK_SIZE);
return skb;
err:
return ERR_PTR(error);
@ -1077,9 +1084,8 @@ static int chcr_update_cipher_iv(struct ablkcipher_request *req,
ret = chcr_update_tweak(req, iv, 0);
else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
if (reqctx->op)
sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
16,
reqctx->processed - AES_BLOCK_SIZE);
/*Updated before sending last WR*/
memcpy(iv, req->info, AES_BLOCK_SIZE);
else
memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
}
@ -1107,11 +1113,8 @@ static int chcr_final_cipher_iv(struct ablkcipher_request *req,
else if (subtype == CRYPTO_ALG_SUB_TYPE_XTS)
ret = chcr_update_tweak(req, iv, 1);
else if (subtype == CRYPTO_ALG_SUB_TYPE_CBC) {
if (reqctx->op)
sg_pcopy_to_buffer(req->src, sg_nents(req->src), iv,
16,
reqctx->processed - AES_BLOCK_SIZE);
else
/*Already updated for Decrypt*/
if (!reqctx->op)
memcpy(iv, &fw6_pld->data[2], AES_BLOCK_SIZE);
}