crypto: nx - convert AES-CBC to skcipher API

Convert the PowerPC Nest (NX) implementation of AES-CBC from the
deprecated "blkcipher" API to the "skcipher" API. This is needed in
order for the blkcipher API to be removed.

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

···
 #include "nx.h"
 
 
-static int cbc_aes_nx_set_key(struct crypto_tfm *tfm,
-			      const u8          *in_key,
-			      unsigned int       key_len)
+static int cbc_aes_nx_set_key(struct crypto_skcipher *tfm,
+			      const u8               *in_key,
+			      unsigned int            key_len)
 {
-	struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
+	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
 	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 
 	nx_ctx_init(nx_ctx, HCOP_FC_AES);
···
 	return 0;
 }
 
-static int cbc_aes_nx_crypt(struct blkcipher_desc *desc,
-			    struct scatterlist    *dst,
-			    struct scatterlist    *src,
-			    unsigned int           nbytes,
-			    int                    enc)
+static int cbc_aes_nx_crypt(struct skcipher_request *req,
+			    int                      enc)
 {
-	struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct nx_crypto_ctx *nx_ctx = crypto_skcipher_ctx(tfm);
 	struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
 	unsigned long irq_flags;
 	unsigned int processed = 0, to_process;
···
 		NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
 
 	do {
-		to_process = nbytes - processed;
+		to_process = req->cryptlen - processed;
 
-		rc = nx_build_sg_lists(nx_ctx, desc->info, dst, src,
+		rc = nx_build_sg_lists(nx_ctx, req->iv, req->dst, req->src,
 				       &to_process, processed,
 				       csbcpb->cpb.aes_cbc.iv);
 		if (rc)
···
 		}
 
 		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;
 
-		memcpy(desc->info, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
+		memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
 		atomic_inc(&(nx_ctx->stats->aes_ops));
 		atomic64_add(csbcpb->csb.processed_byte_count,
 			     &(nx_ctx->stats->aes_bytes));
 
 		processed += to_process;
-	} while (processed < nbytes);
+	} while (processed < req->cryptlen);
 out:
 	spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
 	return rc;
 }
 
-static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc,
-			      struct scatterlist    *dst,
-			      struct scatterlist    *src,
-			      unsigned int           nbytes)
+static int cbc_aes_nx_encrypt(struct skcipher_request *req)
 {
-	return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1);
+	return cbc_aes_nx_crypt(req, 1);
 }
 
-static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc,
-			      struct scatterlist    *dst,
-			      struct scatterlist    *src,
-			      unsigned int           nbytes)
+static int cbc_aes_nx_decrypt(struct skcipher_request *req)
 {
-	return cbc_aes_nx_crypt(desc, dst, src, nbytes, 0);
+	return cbc_aes_nx_crypt(req, 0);
 }
 
-struct crypto_alg nx_cbc_aes_alg = {
-	.cra_name        = "cbc(aes)",
-	.cra_driver_name = "cbc-aes-nx",
-	.cra_priority    = 300,
-	.cra_flags       = CRYPTO_ALG_TYPE_BLKCIPHER,
-	.cra_blocksize   = AES_BLOCK_SIZE,
-	.cra_ctxsize     = sizeof(struct nx_crypto_ctx),
-	.cra_type        = &crypto_blkcipher_type,
-	.cra_alignmask   = 0xf,
-	.cra_module      = THIS_MODULE,
-	.cra_init        = nx_crypto_ctx_aes_cbc_init,
-	.cra_exit        = nx_crypto_ctx_exit,
-	.cra_blkcipher = {
-		.min_keysize = AES_MIN_KEY_SIZE,
-		.max_keysize = AES_MAX_KEY_SIZE,
-		.ivsize      = AES_BLOCK_SIZE,
-		.setkey      = cbc_aes_nx_set_key,
-		.encrypt     = cbc_aes_nx_encrypt,
-		.decrypt     = cbc_aes_nx_decrypt,
-	}
+struct skcipher_alg nx_cbc_aes_alg = {
+	.base.cra_name		= "cbc(aes)",
+	.base.cra_driver_name	= "cbc-aes-nx",
+	.base.cra_priority	= 300,
+	.base.cra_blocksize	= AES_BLOCK_SIZE,
+	.base.cra_ctxsize	= sizeof(struct nx_crypto_ctx),
+	.base.cra_alignmask	= 0xf,
+	.base.cra_module	= THIS_MODULE,
+	.init			= nx_crypto_ctx_aes_cbc_init,
+	.exit			= nx_crypto_ctx_skcipher_exit,
+	.min_keysize		= AES_MIN_KEY_SIZE,
+	.max_keysize		= AES_MAX_KEY_SIZE,
+	.ivsize			= AES_BLOCK_SIZE,
+	.setkey			= cbc_aes_nx_set_key,
+	.encrypt		= cbc_aes_nx_encrypt,
+	.decrypt		= cbc_aes_nx_decrypt,
 };

drivers/crypto/nx/nx.c

···
 	if (rc)
 		goto out;
 
-	rc = nx_register_alg(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC);
+	rc = nx_register_skcipher(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC);
 	if (rc)
 		goto out_unreg_ecb;
 
···
 out_unreg_ctr3686:
 	nx_unregister_alg(&nx_ctr3686_aes_alg, NX_FC_AES, NX_MODE_AES_CTR);
 out_unreg_cbc:
-	nx_unregister_alg(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC);
+	nx_unregister_skcipher(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC);
 out_unreg_ecb:
 	nx_unregister_skcipher(&nx_ecb_aes_alg, NX_FC_AES, NX_MODE_AES_ECB);
 out:
···
 				  NX_MODE_AES_CTR);
 }
 
-int nx_crypto_ctx_aes_cbc_init(struct crypto_tfm *tfm)
+int nx_crypto_ctx_aes_cbc_init(struct crypto_skcipher *tfm)
 {
-	return nx_crypto_ctx_init(crypto_tfm_ctx(tfm), NX_FC_AES,
+	return nx_crypto_ctx_init(crypto_skcipher_ctx(tfm), NX_FC_AES,
 				  NX_MODE_AES_CBC);
 }
 
···
 				   NX_FC_AES, NX_MODE_AES_GCM);
 		nx_unregister_alg(&nx_ctr3686_aes_alg,
 				  NX_FC_AES, NX_MODE_AES_CTR);
-		nx_unregister_alg(&nx_cbc_aes_alg, NX_FC_AES, NX_MODE_AES_CBC);
+		nx_unregister_skcipher(&nx_cbc_aes_alg, NX_FC_AES,
+				       NX_MODE_AES_CBC);
 		nx_unregister_skcipher(&nx_ecb_aes_alg, NX_FC_AES,
 				       NX_MODE_AES_ECB);
 	}

drivers/crypto/nx/nx.h

···
 int nx_crypto_ctx_aes_gcm_init(struct crypto_aead *tfm);
 int nx_crypto_ctx_aes_xcbc_init(struct crypto_tfm *tfm);
 int nx_crypto_ctx_aes_ctr_init(struct crypto_tfm *tfm);
-int nx_crypto_ctx_aes_cbc_init(struct crypto_tfm *tfm);
+int nx_crypto_ctx_aes_cbc_init(struct crypto_skcipher *tfm);
 int nx_crypto_ctx_aes_ecb_init(struct crypto_skcipher *tfm);
 int nx_crypto_ctx_sha_init(struct crypto_tfm *tfm);
 void nx_crypto_ctx_exit(struct crypto_tfm *tfm);
···
 
 #define NX_PAGE_NUM(x)		((u64)(x) & 0xfffffffffffff000ULL)
 
-extern struct crypto_alg nx_cbc_aes_alg;
+extern struct skcipher_alg nx_cbc_aes_alg;
 extern struct skcipher_alg nx_ecb_aes_alg;
 extern struct aead_alg nx_gcm_aes_alg;
 extern struct aead_alg nx_gcm4106_aes_alg;