crypto: nx - don't abuse blkcipher_desc to pass iv around

The NX crypto driver is using 'struct blkcipher_desc' to pass the IV
around, even for AEADs (for which it creates the struct on the stack).
This is not appropriate since this structure is part of the "blkcipher"
API, which is deprecated and will be removed.

Just pass around the IV directly instead.

Signed-off-by: Eric Biggers <[e-mail]>
Reviewed-by: Ard Biesheuvel <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/nx/nx-aes-cbc.c

···
 	do {
 		to_process = nbytes - processed;
 
-		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
-				       processed, csbcpb->cpb.aes_cbc.iv);
+		rc = nx_build_sg_lists(nx_ctx, desc->info, dst, src,
+				       &to_process, processed,
+				       csbcpb->cpb.aes_cbc.iv);
 		if (rc)
 			goto out;
 

drivers/crypto/nx/nx-aes-ccm.c

···
 }
 
 static int ccm_nx_decrypt(struct aead_request   *req,
-			  struct blkcipher_desc *desc,
+			  u8                    *iv,
 			  unsigned int assoclen)
 {
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
···
 				 req->src, nbytes + req->assoclen, authsize,
 				 SCATTERWALK_FROM_SG);
 
-	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes, assoclen,
+	rc = generate_pat(iv, req, nx_ctx, authsize, nbytes, assoclen,
 			  csbcpb->cpb.aes_ccm.in_pat_or_b0);
 	if (rc)
 		goto out;
···
 
 		NX_CPB_FDM(nx_ctx->csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
 
-		rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
+		rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src,
 				       &to_process, processed + req->assoclen,
 				       csbcpb->cpb.aes_ccm.iv_or_ctr);
 		if (rc)
···
 		/* for partial completion, copy following for next
 		 * entry into loop...
 		 */
-		memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
+		memcpy(iv, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 			csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_ccm.in_s0,
···
 }
 
 static int ccm_nx_encrypt(struct aead_request   *req,
-			  struct blkcipher_desc *desc,
+			  u8                    *iv,
 			  unsigned int assoclen)
 {
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
···
 
 	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 
-	rc = generate_pat(desc->info, req, nx_ctx, authsize, nbytes, assoclen,
+	rc = generate_pat(iv, req, nx_ctx, authsize, nbytes, assoclen,
 			  csbcpb->cpb.aes_ccm.in_pat_or_b0);
 	if (rc)
 		goto out;
···
 
 		NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
 
-		rc = nx_build_sg_lists(nx_ctx, desc, req->dst, req->src,
+		rc = nx_build_sg_lists(nx_ctx, iv, req->dst, req->src,
 				       &to_process, processed + req->assoclen,
 				       csbcpb->cpb.aes_ccm.iv_or_ctr);
 		if (rc)
···
 		/* for partial completion, copy following for next
 		 * entry into loop...
 		 */
-		memcpy(desc->info, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
+		memcpy(iv, csbcpb->cpb.aes_ccm.out_ctr, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_ccm.in_pat_or_b0,
 			csbcpb->cpb.aes_ccm.out_pat_or_mac, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_ccm.in_s0,
···
 {
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 	struct nx_gcm_rctx *rctx = aead_request_ctx(req);
-	struct blkcipher_desc desc;
 	u8 *iv = rctx->iv;
 
 	iv[0] = 3;
 	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 	memcpy(iv + 4, req->iv, 8);
 
-	desc.info = iv;
-
-	return ccm_nx_encrypt(req, &desc, req->assoclen - 8);
+	return ccm_nx_encrypt(req, iv, req->assoclen - 8);
 }
 
 static int ccm_aes_nx_encrypt(struct aead_request *req)
 {
-	struct blkcipher_desc desc;
 	int rc;
 
-	desc.info = req->iv;
-
-	rc = crypto_ccm_check_iv(desc.info);
+	rc = crypto_ccm_check_iv(req->iv);
 	if (rc)
 		return rc;
 
-	return ccm_nx_encrypt(req, &desc, req->assoclen);
+	return ccm_nx_encrypt(req, req->iv, req->assoclen);
 }
 
 static int ccm4309_aes_nx_decrypt(struct aead_request *req)
 {
 	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(req->base.tfm);
 	struct nx_gcm_rctx *rctx = aead_request_ctx(req);
-	struct blkcipher_desc desc;
 	u8 *iv = rctx->iv;
 
 	iv[0] = 3;
 	memcpy(iv + 1, nx_ctx->priv.ccm.nonce, 3);
 	memcpy(iv + 4, req->iv, 8);
 
-	desc.info = iv;
-
-	return ccm_nx_decrypt(req, &desc, req->assoclen - 8);
+	return ccm_nx_decrypt(req, iv, req->assoclen - 8);
 }
 
 static int ccm_aes_nx_decrypt(struct aead_request *req)
 {
-	struct blkcipher_desc desc;
 	int rc;
 
-	desc.info = req->iv;
-
-	rc = crypto_ccm_check_iv(desc.info);
+	rc = crypto_ccm_check_iv(req->iv);
 	if (rc)
 		return rc;
 
-	return ccm_nx_decrypt(req, &desc, req->assoclen);
+	return ccm_nx_decrypt(req, req->iv, req->assoclen);
 }
 
 /* tell the block cipher walk routines that this is a stream cipher by

drivers/crypto/nx/nx-aes-ctr.c

···
 	do {
 		to_process = nbytes - processed;
 
-		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
-				       processed, csbcpb->cpb.aes_ctr.iv);
+		rc = nx_build_sg_lists(nx_ctx, desc->info, dst, src,
+				       &to_process, processed,
+				       csbcpb->cpb.aes_ctr.iv);
 		if (rc)
 			goto out;
 

drivers/crypto/nx/nx-aes-ecb.c

···
 	do {
 		to_process = nbytes - processed;
 
-		rc = nx_build_sg_lists(nx_ctx, desc, dst, src, &to_process,
-				processed, NULL);
+		rc = nx_build_sg_lists(nx_ctx, NULL, dst, src, &to_process,
+				       processed, NULL);
 		if (rc)
 			goto out;
 

drivers/crypto/nx/nx-aes-gcm.c

···
 	return rc;
 }
 
-static int gmac(struct aead_request *req, struct blkcipher_desc *desc,
-		unsigned int assoclen)
+static int gmac(struct aead_request *req, const u8 *iv, unsigned int assoclen)
 {
 	int rc;
 	struct nx_crypto_ctx *nx_ctx =
···
 			   nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 
 	/* Copy IV */
-	memcpy(csbcpb->cpb.aes_gcm.iv_or_cnt, desc->info, AES_BLOCK_SIZE);
+	memcpy(csbcpb->cpb.aes_gcm.iv_or_cnt, iv, AES_BLOCK_SIZE);
 
 	do {
 		/*
···
 	return rc;
 }
 
-static int gcm_empty(struct aead_request *req, struct blkcipher_desc *desc,
-		     int enc)
+static int gcm_empty(struct aead_request *req, const u8 *iv, int enc)
 {
 	int rc;
 	struct nx_crypto_ctx *nx_ctx =
···
 	len = AES_BLOCK_SIZE;
 
 	/* Encrypt the counter/IV */
-	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) desc->info,
+	in_sg = nx_build_sg_list(nx_ctx->in_sg, (u8 *) iv,
 				 &len, nx_ctx->ap->sglen);
 
 	if (len != AES_BLOCK_SIZE)
···
 	nx_ctx->op.outlen = (nx_ctx->out_sg - out_sg) * sizeof(struct nx_sg);
 
 	rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
-			   desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+			   req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
 	if (rc)
 		goto out;
 	atomic_inc(&(nx_ctx->stats->aes_ops));
···
 		crypto_aead_ctx(crypto_aead_reqtfm(req));
 	struct nx_gcm_rctx *rctx = aead_request_ctx(req);
 	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
-	struct blkcipher_desc desc;
 	unsigned int nbytes = req->cryptlen;
 	unsigned int processed = 0, to_process;
 	unsigned long irq_flags;
···
 
 	spin_lock_irqsave(&nx_ctx->lock, irq_flags);
 
-	desc.info = rctx->iv;
 	/* initialize the counter */
-	*(u32 *)(desc.info + NX_GCM_CTR_OFFSET) = 1;
+	*(u32 *)&rctx->iv[NX_GCM_CTR_OFFSET] = 1;
 
 	if (nbytes == 0) {
 		if (assoclen == 0)
-			rc = gcm_empty(req, &desc, enc);
+			rc = gcm_empty(req, rctx->iv, enc);
 		else
-			rc = gmac(req, &desc, assoclen);
+			rc = gmac(req, rctx->iv, assoclen);
 		if (rc)
 			goto out;
 		else
···
 		to_process = nbytes - processed;
 
 		csbcpb->cpb.aes_gcm.bit_length_data = nbytes * 8;
-		rc = nx_build_sg_lists(nx_ctx, &desc, req->dst,
+		rc = nx_build_sg_lists(nx_ctx, rctx->iv, req->dst,
 				       req->src, &to_process,
 				       processed + req->assoclen,
 				       csbcpb->cpb.aes_gcm.iv_or_cnt);
···
 		if (rc)
 			goto out;
 
-		memcpy(desc.info, csbcpb->cpb.aes_gcm.out_cnt, AES_BLOCK_SIZE);
+		memcpy(rctx->iv, csbcpb->cpb.aes_gcm.out_cnt, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_gcm.in_pat_or_aad,
 			csbcpb->cpb.aes_gcm.out_pat_or_mac, AES_BLOCK_SIZE);
 		memcpy(csbcpb->cpb.aes_gcm.in_s0,

drivers/crypto/nx/nx.c

···
  *                     scatterlists based on them.
  *
  * @nx_ctx: NX crypto context for the lists we're building
- * @desc: the block cipher descriptor for the operation
+ * @iv: iv data, if the algorithm requires it
  * @dst: destination scatterlist
  * @src: source scatterlist
  * @nbytes: length of data described in the scatterlists
  * @offset: number of bytes to fast-forward past at the beginning of
  *          scatterlists.
- * @iv: destination for the iv data, if the algorithm requires it
+ * @oiv: destination for the iv data, if the algorithm requires it
  *
- * This is common code shared by all the AES algorithms. It uses the block
- * cipher walk routines to traverse input and output scatterlists, building
+ * This is common code shared by all the AES algorithms. It uses the crypto
+ * scatterlist walk routines to traverse input and output scatterlists, building
  * corresponding NX scatterlists
  */
 int nx_build_sg_lists(struct nx_crypto_ctx  *nx_ctx,
-		      struct blkcipher_desc *desc,
+		      const u8              *iv,
 		      struct scatterlist    *dst,
 		      struct scatterlist    *src,
 		      unsigned int          *nbytes,
 		      unsigned int           offset,
-		      u8                    *iv)
+		      u8                    *oiv)
 {
 	unsigned int delta = 0;
 	unsigned int total = *nbytes;
···
 	max_sg_len = min_t(u64, max_sg_len,
 			nx_ctx->ap->databytelen/NX_PAGE_SIZE);
 
-	if (iv)
-		memcpy(iv, desc->info, AES_BLOCK_SIZE);
+	if (oiv)
+		memcpy(oiv, iv, AES_BLOCK_SIZE);
 
 	*nbytes = min_t(u64, *nbytes, nx_ctx->ap->databytelen);
 

drivers/crypto/nx/nx.h

···
 int nx_hcall_sync(struct nx_crypto_ctx *ctx, struct vio_pfo_op *op,
 		  u32 may_sleep);
 struct nx_sg *nx_build_sg_list(struct nx_sg *, u8 *, unsigned int *, u32);
-int nx_build_sg_lists(struct nx_crypto_ctx *, struct blkcipher_desc *,
-		      struct scatterlist *, struct scatterlist *, unsigned int *,
-		      unsigned int, u8 *);
+int nx_build_sg_lists(struct nx_crypto_ctx *nx_ctx, const u8 *iv,
+		      struct scatterlist *dst, struct scatterlist *src,
+		      unsigned int *nbytes, unsigned int offset, u8 *oiv);
 struct nx_sg *nx_walk_and_build(struct nx_sg *, unsigned int,
 				struct scatterlist *, unsigned int,
 				unsigned int *);