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Commit 5fb78dba authored by Harsh Jain's avatar Harsh Jain Committed by Herbert Xu
Browse files

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: default avatarHarsh Jain <harsh@chelsio.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent 1d693cf6

drivers/crypto/chelsio/chcr_algo.c

+11 −8
Original line number Diff line number Diff line
@@ -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);



	}