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path: root/drivers/crypto/nx/nx-aes-cbc.c
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-rw-r--r--drivers/crypto/nx/nx-aes-cbc.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/drivers/crypto/nx/nx-aes-cbc.c b/drivers/crypto/nx/nx-aes-cbc.c
new file mode 100644
index 000000000..0e440f704
--- /dev/null
+++ b/drivers/crypto/nx/nx-aes-cbc.c
@@ -0,0 +1,127 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AES CBC routines supporting the Power 7+ Nest Accelerators driver
+ *
+ * Copyright (C) 2011-2012 International Business Machines Inc.
+ *
+ * Author: Kent Yoder <yoder1@us.ibm.com>
+ */
+
+#include <crypto/aes.h>
+#include <crypto/algapi.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/crypto.h>
+#include <asm/vio.h>
+
+#include "nx_csbcpb.h"
+#include "nx.h"
+
+
+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_skcipher_ctx(tfm);
+ struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
+
+ nx_ctx_init(nx_ctx, HCOP_FC_AES);
+
+ switch (key_len) {
+ case AES_KEYSIZE_128:
+ NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_128);
+ nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_128];
+ break;
+ case AES_KEYSIZE_192:
+ NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_192);
+ nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_192];
+ break;
+ case AES_KEYSIZE_256:
+ NX_CPB_SET_KEY_SIZE(csbcpb, NX_KS_AES_256);
+ nx_ctx->ap = &nx_ctx->props[NX_PROPS_AES_256];
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ csbcpb->cpb.hdr.mode = NX_MODE_AES_CBC;
+ memcpy(csbcpb->cpb.aes_cbc.key, in_key, key_len);
+
+ return 0;
+}
+
+static int cbc_aes_nx_crypt(struct skcipher_request *req,
+ int enc)
+{
+ 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;
+ int rc;
+
+ spin_lock_irqsave(&nx_ctx->lock, irq_flags);
+
+ if (enc)
+ NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
+ else
+ NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
+
+ do {
+ to_process = req->cryptlen - processed;
+
+ rc = nx_build_sg_lists(nx_ctx, req->iv, req->dst, req->src,
+ &to_process, processed,
+ csbcpb->cpb.aes_cbc.iv);
+ if (rc)
+ goto out;
+
+ if (!nx_ctx->op.inlen || !nx_ctx->op.outlen) {
+ rc = -EINVAL;
+ goto out;
+ }
+
+ rc = nx_hcall_sync(nx_ctx, &nx_ctx->op,
+ req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+ if (rc)
+ goto out;
+
+ memcpy(req->iv, csbcpb->cpb.aes_cbc.cv, AES_BLOCK_SIZE);
+ atomic_inc(&(nx_ctx->stats->aes_ops));
+ atomic64_add(be32_to_cpu(csbcpb->csb.processed_byte_count),
+ &(nx_ctx->stats->aes_bytes));
+
+ processed += to_process;
+ } while (processed < req->cryptlen);
+out:
+ spin_unlock_irqrestore(&nx_ctx->lock, irq_flags);
+ return rc;
+}
+
+static int cbc_aes_nx_encrypt(struct skcipher_request *req)
+{
+ return cbc_aes_nx_crypt(req, 1);
+}
+
+static int cbc_aes_nx_decrypt(struct skcipher_request *req)
+{
+ return cbc_aes_nx_crypt(req, 0);
+}
+
+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,
+};