crypto: ccp - CCP XTS-AES crypto API support

These routines provide crypto API support for the XTS-AES mode of AES
on the AMD CCP.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

diff --git a/drivers/crypto/ccp/ccp-crypto-aes-xts.c b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
new file mode 100644 (file)
index 0000000..d100b48
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-aes-xts.c
@@ -0,0 +1,285 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) AES XTS crypto API support
+ *
+ * Copyright (C) 2013 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <crypto/aes.h>
+#include <crypto/scatterwalk.h>
+
+#include "ccp-crypto.h"
+
+
+struct ccp_aes_xts_def {
+       const char *name;
+       const char *drv_name;
+};
+
+static struct ccp_aes_xts_def aes_xts_algs[] = {
+       {
+               .name           = "xts(aes)",
+               .drv_name       = "xts-aes-ccp",
+       },
+};
+
+struct ccp_unit_size_map {
+       unsigned int size;
+       u32 value;
+};
+
+static struct ccp_unit_size_map unit_size_map[] = {
+       {
+               .size   = 4096,
+               .value  = CCP_XTS_AES_UNIT_SIZE_4096,
+       },
+       {
+               .size   = 2048,
+               .value  = CCP_XTS_AES_UNIT_SIZE_2048,
+       },
+       {
+               .size   = 1024,
+               .value  = CCP_XTS_AES_UNIT_SIZE_1024,
+       },
+       {
+               .size   = 512,
+               .value  = CCP_XTS_AES_UNIT_SIZE_512,
+       },
+       {
+               .size   = 256,
+               .value  = CCP_XTS_AES_UNIT_SIZE__LAST,
+       },
+       {
+               .size   = 128,
+               .value  = CCP_XTS_AES_UNIT_SIZE__LAST,
+       },
+       {
+               .size   = 64,
+               .value  = CCP_XTS_AES_UNIT_SIZE__LAST,
+       },
+       {
+               .size   = 32,
+               .value  = CCP_XTS_AES_UNIT_SIZE__LAST,
+       },
+       {
+               .size   = 16,
+               .value  = CCP_XTS_AES_UNIT_SIZE_16,
+       },
+       {
+               .size   = 1,
+               .value  = CCP_XTS_AES_UNIT_SIZE__LAST,
+       },
+};
+
+static int ccp_aes_xts_complete(struct crypto_async_request *async_req, int ret)
+{
+       struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
+       struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
+
+       if (ret)
+               return ret;
+
+       memcpy(req->info, rctx->iv, AES_BLOCK_SIZE);
+
+       return 0;
+}
+
+static int ccp_aes_xts_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+                             unsigned int key_len)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
+
+       /* Only support 128-bit AES key with a 128-bit Tweak key,
+        * otherwise use the fallback
+        */
+       switch (key_len) {
+       case AES_KEYSIZE_128 * 2:
+               memcpy(ctx->u.aes.key, key, key_len);
+               break;
+       }
+       ctx->u.aes.key_len = key_len / 2;
+       sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
+
+       return crypto_ablkcipher_setkey(ctx->u.aes.tfm_ablkcipher, key,
+                                       key_len);
+}
+
+static int ccp_aes_xts_crypt(struct ablkcipher_request *req,
+                            unsigned int encrypt)
+{
+       struct crypto_tfm *tfm =
+               crypto_ablkcipher_tfm(crypto_ablkcipher_reqtfm(req));
+       struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+       struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
+       unsigned int unit;
+       int ret;
+
+       if (!ctx->u.aes.key_len) {
+               pr_err("AES key not set\n");
+               return -EINVAL;
+       }
+
+       if (req->nbytes & (AES_BLOCK_SIZE - 1)) {
+               pr_err("AES request size is not a multiple of the block size\n");
+               return -EINVAL;
+       }
+
+       if (!req->info) {
+               pr_err("AES IV not supplied");
+               return -EINVAL;
+       }
+
+       for (unit = 0; unit < ARRAY_SIZE(unit_size_map); unit++)
+               if (!(req->nbytes & (unit_size_map[unit].size - 1)))
+                       break;
+
+       if ((unit_size_map[unit].value == CCP_XTS_AES_UNIT_SIZE__LAST) ||
+           (ctx->u.aes.key_len != AES_KEYSIZE_128)) {
+               /* Use the fallback to process the request for any
+                * unsupported unit sizes or key sizes
+                */
+               ablkcipher_request_set_tfm(req, ctx->u.aes.tfm_ablkcipher);
+               ret = (encrypt) ? crypto_ablkcipher_encrypt(req) :
+                                 crypto_ablkcipher_decrypt(req);
+               ablkcipher_request_set_tfm(req, __crypto_ablkcipher_cast(tfm));
+
+               return ret;
+       }
+
+       memcpy(rctx->iv, req->info, AES_BLOCK_SIZE);
+       sg_init_one(&rctx->iv_sg, rctx->iv, AES_BLOCK_SIZE);
+
+       memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+       INIT_LIST_HEAD(&rctx->cmd.entry);
+       rctx->cmd.engine = CCP_ENGINE_XTS_AES_128;
+       rctx->cmd.u.xts.action = (encrypt) ? CCP_AES_ACTION_ENCRYPT
+                                          : CCP_AES_ACTION_DECRYPT;
+       rctx->cmd.u.xts.unit_size = unit_size_map[unit].value;
+       rctx->cmd.u.xts.key = &ctx->u.aes.key_sg;
+       rctx->cmd.u.xts.key_len = ctx->u.aes.key_len;
+       rctx->cmd.u.xts.iv = &rctx->iv_sg;
+       rctx->cmd.u.xts.iv_len = AES_BLOCK_SIZE;
+       rctx->cmd.u.xts.src = req->src;
+       rctx->cmd.u.xts.src_len = req->nbytes;
+       rctx->cmd.u.xts.dst = req->dst;
+
+       ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+       return ret;
+}
+
+static int ccp_aes_xts_encrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_xts_crypt(req, 1);
+}
+
+static int ccp_aes_xts_decrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_xts_crypt(req, 0);
+}
+
+static int ccp_aes_xts_cra_init(struct crypto_tfm *tfm)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+       struct crypto_ablkcipher *fallback_tfm;
+
+       ctx->complete = ccp_aes_xts_complete;
+       ctx->u.aes.key_len = 0;
+
+       fallback_tfm = crypto_alloc_ablkcipher(tfm->__crt_alg->cra_name, 0,
+                                              CRYPTO_ALG_ASYNC |
+                                              CRYPTO_ALG_NEED_FALLBACK);
+       if (IS_ERR(fallback_tfm)) {
+               pr_warn("could not load fallback driver %s\n",
+                       tfm->__crt_alg->cra_name);
+               return PTR_ERR(fallback_tfm);
+       }
+       ctx->u.aes.tfm_ablkcipher = fallback_tfm;
+
+       tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx) +
+                                     fallback_tfm->base.crt_ablkcipher.reqsize;
+
+       return 0;
+}
+
+static void ccp_aes_xts_cra_exit(struct crypto_tfm *tfm)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       if (ctx->u.aes.tfm_ablkcipher)
+               crypto_free_ablkcipher(ctx->u.aes.tfm_ablkcipher);
+       ctx->u.aes.tfm_ablkcipher = NULL;
+}
+
+
+static int ccp_register_aes_xts_alg(struct list_head *head,
+                                   const struct ccp_aes_xts_def *def)
+{
+       struct ccp_crypto_ablkcipher_alg *ccp_alg;
+       struct crypto_alg *alg;
+       int ret;
+
+       ccp_alg = kzalloc(sizeof(*ccp_alg), GFP_KERNEL);
+       if (!ccp_alg)
+               return -ENOMEM;
+
+       INIT_LIST_HEAD(&ccp_alg->entry);
+
+       alg = &ccp_alg->alg;
+
+       snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+       snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+                def->drv_name);
+       alg->cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC |
+                        CRYPTO_ALG_KERN_DRIVER_ONLY |
+                        CRYPTO_ALG_NEED_FALLBACK;
+       alg->cra_blocksize = AES_BLOCK_SIZE;
+       alg->cra_ctxsize = sizeof(struct ccp_ctx);
+       alg->cra_priority = CCP_CRA_PRIORITY;
+       alg->cra_type = &crypto_ablkcipher_type;
+       alg->cra_ablkcipher.setkey = ccp_aes_xts_setkey;
+       alg->cra_ablkcipher.encrypt = ccp_aes_xts_encrypt;
+       alg->cra_ablkcipher.decrypt = ccp_aes_xts_decrypt;
+       alg->cra_ablkcipher.min_keysize = AES_MIN_KEY_SIZE * 2;
+       alg->cra_ablkcipher.max_keysize = AES_MAX_KEY_SIZE * 2;
+       alg->cra_ablkcipher.ivsize = AES_BLOCK_SIZE;
+       alg->cra_init = ccp_aes_xts_cra_init;
+       alg->cra_exit = ccp_aes_xts_cra_exit;
+       alg->cra_module = THIS_MODULE;
+
+       ret = crypto_register_alg(alg);
+       if (ret) {
+               pr_err("%s ablkcipher algorithm registration error (%d)\n",
+                       alg->cra_name, ret);
+               kfree(ccp_alg);
+               return ret;
+       }
+
+       list_add(&ccp_alg->entry, head);
+
+       return 0;
+}
+
+int ccp_register_aes_xts_algs(struct list_head *head)
+{
+       int i, ret;
+
+       for (i = 0; i < ARRAY_SIZE(aes_xts_algs); i++) {
+               ret = ccp_register_aes_xts_alg(head, &aes_xts_algs[i]);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}