powerpc/crypto: AES-CBC mode routines for nx encryption

These routines add support for AES in CBC mode on the Power7+ CPU's
in-Nest accelerator driver.

Signed-off-by: Kent Yoder <key@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

1 files changed, 141 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 000000000000..69ed796ee327
--- /dev/null
+++ b/drivers/crypto/nx/nx-aes-cbc.c
@@ -0,0 +1,141 @@
+/**
+ * AES CBC routines supporting the Power 7+ Nest Accelerators driver
+ *
+ * Copyright (C) 2011-2012 International Business Machines Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 only.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * 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_tfm *tfm,
+                              const u8          *in_key,
+                              unsigned int       key_len)
+{
+        struct nx_crypto_ctx *nx_ctx = crypto_tfm_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 blkcipher_desc *desc,
+                            struct scatterlist    *dst,
+                            struct scatterlist    *src,
+                            unsigned int           nbytes,
+                            int                    enc)
+{
+        struct nx_crypto_ctx *nx_ctx = crypto_blkcipher_ctx(desc->tfm);
+        struct nx_csbcpb *csbcpb = nx_ctx->csbcpb;
+        int rc;
+
+        if (nbytes > nx_ctx->ap->databytelen)
+                return -EINVAL;
+
+        if (enc)
+                NX_CPB_FDM(csbcpb) |= NX_FDM_ENDE_ENCRYPT;
+        else
+                NX_CPB_FDM(csbcpb) &= ~NX_FDM_ENDE_ENCRYPT;
+
+        rc = nx_build_sg_lists(nx_ctx, desc, dst, src, nbytes,
+                               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,
+                           desc->flags & CRYPTO_TFM_REQ_MAY_SLEEP);
+        if (rc)
+                goto out;
+
+        atomic_inc(&(nx_ctx->stats->aes_ops));
+        atomic64_add(csbcpb->csb.processed_byte_count,
+                     &(nx_ctx->stats->aes_bytes));
+out:
+        return rc;
+}
+
+static int cbc_aes_nx_encrypt(struct blkcipher_desc *desc,
+                              struct scatterlist    *dst,
+                              struct scatterlist    *src,
+                              unsigned int           nbytes)
+{
+        return cbc_aes_nx_crypt(desc, dst, src, nbytes, 1);
+}
+
+static int cbc_aes_nx_decrypt(struct blkcipher_desc *desc,
+                              struct scatterlist    *dst,
+                              struct scatterlist    *src,
+                              unsigned int           nbytes)
+{
+        return cbc_aes_nx_crypt(desc, dst, src, nbytes, 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_module      = THIS_MODULE,
+        .cra_list        = LIST_HEAD_INIT(nx_cbc_aes_alg.cra_list),
+        .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,
+        }
+};