crypto: ccp - CCP AES crypto API support
authorTom Lendacky <thomas.lendacky@amd.com>
Tue, 12 Nov 2013 17:46:28 +0000 (11:46 -0600)
committerHerbert Xu <herbert@gondor.apana.org.au>
Thu, 5 Dec 2013 13:28:38 +0000 (21:28 +0800)
These routines provide crypto API support for AES on the AMD CCP.

Support for AES modes: ECB, CBC, OFB, CFB and CTR

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
drivers/crypto/ccp/ccp-crypto-aes.c [new file with mode: 0644]

diff --git a/drivers/crypto/ccp/ccp-crypto-aes.c b/drivers/crypto/ccp/ccp-crypto-aes.c
new file mode 100644 (file)
index 0000000..f302a5b
--- /dev/null
@@ -0,0 +1,375 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) AES 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/ctr.h>
+#include <crypto/scatterwalk.h>
+
+#include "ccp-crypto.h"
+
+
+static int ccp_aes_complete(struct crypto_async_request *async_req, int ret)
+{
+       struct ablkcipher_request *req = ablkcipher_request_cast(async_req);
+       struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+       struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
+
+       if (ret)
+               return ret;
+
+       if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
+               memcpy(req->info, rctx->iv, AES_BLOCK_SIZE);
+
+       return 0;
+}
+
+static int ccp_aes_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+                         unsigned int key_len)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
+       struct ccp_crypto_ablkcipher_alg *alg =
+               ccp_crypto_ablkcipher_alg(crypto_ablkcipher_tfm(tfm));
+
+       switch (key_len) {
+       case AES_KEYSIZE_128:
+               ctx->u.aes.type = CCP_AES_TYPE_128;
+               break;
+       case AES_KEYSIZE_192:
+               ctx->u.aes.type = CCP_AES_TYPE_192;
+               break;
+       case AES_KEYSIZE_256:
+               ctx->u.aes.type = CCP_AES_TYPE_256;
+               break;
+       default:
+               crypto_ablkcipher_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
+               return -EINVAL;
+       }
+       ctx->u.aes.mode = alg->mode;
+       ctx->u.aes.key_len = key_len;
+
+       memcpy(ctx->u.aes.key, key, key_len);
+       sg_init_one(&ctx->u.aes.key_sg, ctx->u.aes.key, key_len);
+
+       return 0;
+}
+
+static int ccp_aes_crypt(struct ablkcipher_request *req, bool encrypt)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+       struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
+       struct scatterlist *iv_sg = NULL;
+       unsigned int iv_len = 0;
+       int ret;
+
+       if (!ctx->u.aes.key_len) {
+               pr_err("AES key not set\n");
+               return -EINVAL;
+       }
+
+       if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
+            (ctx->u.aes.mode == CCP_AES_MODE_CBC) ||
+            (ctx->u.aes.mode == CCP_AES_MODE_CFB)) &&
+           (req->nbytes & (AES_BLOCK_SIZE - 1))) {
+               pr_err("AES request size is not a multiple of the block size\n");
+               return -EINVAL;
+       }
+
+       if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
+               if (!req->info) {
+                       pr_err("AES IV not supplied");
+                       return -EINVAL;
+               }
+
+               memcpy(rctx->iv, req->info, AES_BLOCK_SIZE);
+               iv_sg = &rctx->iv_sg;
+               iv_len = AES_BLOCK_SIZE;
+               sg_init_one(iv_sg, rctx->iv, iv_len);
+       }
+
+       memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+       INIT_LIST_HEAD(&rctx->cmd.entry);
+       rctx->cmd.engine = CCP_ENGINE_AES;
+       rctx->cmd.u.aes.type = ctx->u.aes.type;
+       rctx->cmd.u.aes.mode = ctx->u.aes.mode;
+       rctx->cmd.u.aes.action =
+               (encrypt) ? CCP_AES_ACTION_ENCRYPT : CCP_AES_ACTION_DECRYPT;
+       rctx->cmd.u.aes.key = &ctx->u.aes.key_sg;
+       rctx->cmd.u.aes.key_len = ctx->u.aes.key_len;
+       rctx->cmd.u.aes.iv = iv_sg;
+       rctx->cmd.u.aes.iv_len = iv_len;
+       rctx->cmd.u.aes.src = req->src;
+       rctx->cmd.u.aes.src_len = req->nbytes;
+       rctx->cmd.u.aes.dst = req->dst;
+
+       ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+       return ret;
+}
+
+static int ccp_aes_encrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_crypt(req, true);
+}
+
+static int ccp_aes_decrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_crypt(req, false);
+}
+
+static int ccp_aes_cra_init(struct crypto_tfm *tfm)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       ctx->complete = ccp_aes_complete;
+       ctx->u.aes.key_len = 0;
+
+       tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
+
+       return 0;
+}
+
+static void ccp_aes_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static int ccp_aes_rfc3686_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);
+
+       /* Restore the original pointer */
+       req->info = rctx->rfc3686_info;
+
+       return ccp_aes_complete(async_req, ret);
+}
+
+static int ccp_aes_rfc3686_setkey(struct crypto_ablkcipher *tfm, const u8 *key,
+                                 unsigned int key_len)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(crypto_ablkcipher_tfm(tfm));
+
+       if (key_len < CTR_RFC3686_NONCE_SIZE)
+               return -EINVAL;
+
+       key_len -= CTR_RFC3686_NONCE_SIZE;
+       memcpy(ctx->u.aes.nonce, key + key_len, CTR_RFC3686_NONCE_SIZE);
+
+       return ccp_aes_setkey(tfm, key, key_len);
+}
+
+static int ccp_aes_rfc3686_crypt(struct ablkcipher_request *req, bool encrypt)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
+       struct ccp_aes_req_ctx *rctx = ablkcipher_request_ctx(req);
+       u8 *iv;
+
+       /* Initialize the CTR block */
+       iv = rctx->rfc3686_iv;
+       memcpy(iv, ctx->u.aes.nonce, CTR_RFC3686_NONCE_SIZE);
+
+       iv += CTR_RFC3686_NONCE_SIZE;
+       memcpy(iv, req->info, CTR_RFC3686_IV_SIZE);
+
+       iv += CTR_RFC3686_IV_SIZE;
+       *(__be32 *)iv = cpu_to_be32(1);
+
+       /* Point to the new IV */
+       rctx->rfc3686_info = req->info;
+       req->info = rctx->rfc3686_iv;
+
+       return ccp_aes_crypt(req, encrypt);
+}
+
+static int ccp_aes_rfc3686_encrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_rfc3686_crypt(req, true);
+}
+
+static int ccp_aes_rfc3686_decrypt(struct ablkcipher_request *req)
+{
+       return ccp_aes_rfc3686_crypt(req, false);
+}
+
+static int ccp_aes_rfc3686_cra_init(struct crypto_tfm *tfm)
+{
+       struct ccp_ctx *ctx = crypto_tfm_ctx(tfm);
+
+       ctx->complete = ccp_aes_rfc3686_complete;
+       ctx->u.aes.key_len = 0;
+
+       tfm->crt_ablkcipher.reqsize = sizeof(struct ccp_aes_req_ctx);
+
+       return 0;
+}
+
+static void ccp_aes_rfc3686_cra_exit(struct crypto_tfm *tfm)
+{
+}
+
+static struct crypto_alg ccp_aes_defaults = {
+       .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
+                         CRYPTO_ALG_ASYNC |
+                         CRYPTO_ALG_KERN_DRIVER_ONLY |
+                         CRYPTO_ALG_NEED_FALLBACK,
+       .cra_blocksize  = AES_BLOCK_SIZE,
+       .cra_ctxsize    = sizeof(struct ccp_ctx),
+       .cra_priority   = CCP_CRA_PRIORITY,
+       .cra_type       = &crypto_ablkcipher_type,
+       .cra_init       = ccp_aes_cra_init,
+       .cra_exit       = ccp_aes_cra_exit,
+       .cra_module     = THIS_MODULE,
+       .cra_ablkcipher = {
+               .setkey         = ccp_aes_setkey,
+               .encrypt        = ccp_aes_encrypt,
+               .decrypt        = ccp_aes_decrypt,
+               .min_keysize    = AES_MIN_KEY_SIZE,
+               .max_keysize    = AES_MAX_KEY_SIZE,
+       },
+};
+
+static struct crypto_alg ccp_aes_rfc3686_defaults = {
+       .cra_flags      = CRYPTO_ALG_TYPE_ABLKCIPHER |
+                          CRYPTO_ALG_ASYNC |
+                          CRYPTO_ALG_KERN_DRIVER_ONLY |
+                          CRYPTO_ALG_NEED_FALLBACK,
+       .cra_blocksize  = CTR_RFC3686_BLOCK_SIZE,
+       .cra_ctxsize    = sizeof(struct ccp_ctx),
+       .cra_priority   = CCP_CRA_PRIORITY,
+       .cra_type       = &crypto_ablkcipher_type,
+       .cra_init       = ccp_aes_rfc3686_cra_init,
+       .cra_exit       = ccp_aes_rfc3686_cra_exit,
+       .cra_module     = THIS_MODULE,
+       .cra_ablkcipher = {
+               .setkey         = ccp_aes_rfc3686_setkey,
+               .encrypt        = ccp_aes_rfc3686_encrypt,
+               .decrypt        = ccp_aes_rfc3686_decrypt,
+               .min_keysize    = AES_MIN_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
+               .max_keysize    = AES_MAX_KEY_SIZE + CTR_RFC3686_NONCE_SIZE,
+       },
+};
+
+struct ccp_aes_def {
+       enum ccp_aes_mode mode;
+       const char *name;
+       const char *driver_name;
+       unsigned int blocksize;
+       unsigned int ivsize;
+       struct crypto_alg *alg_defaults;
+};
+
+static struct ccp_aes_def aes_algs[] = {
+       {
+               .mode           = CCP_AES_MODE_ECB,
+               .name           = "ecb(aes)",
+               .driver_name    = "ecb-aes-ccp",
+               .blocksize      = AES_BLOCK_SIZE,
+               .ivsize         = 0,
+               .alg_defaults   = &ccp_aes_defaults,
+       },
+       {
+               .mode           = CCP_AES_MODE_CBC,
+               .name           = "cbc(aes)",
+               .driver_name    = "cbc-aes-ccp",
+               .blocksize      = AES_BLOCK_SIZE,
+               .ivsize         = AES_BLOCK_SIZE,
+               .alg_defaults   = &ccp_aes_defaults,
+       },
+       {
+               .mode           = CCP_AES_MODE_CFB,
+               .name           = "cfb(aes)",
+               .driver_name    = "cfb-aes-ccp",
+               .blocksize      = AES_BLOCK_SIZE,
+               .ivsize         = AES_BLOCK_SIZE,
+               .alg_defaults   = &ccp_aes_defaults,
+       },
+       {
+               .mode           = CCP_AES_MODE_OFB,
+               .name           = "ofb(aes)",
+               .driver_name    = "ofb-aes-ccp",
+               .blocksize      = 1,
+               .ivsize         = AES_BLOCK_SIZE,
+               .alg_defaults   = &ccp_aes_defaults,
+       },
+       {
+               .mode           = CCP_AES_MODE_CTR,
+               .name           = "ctr(aes)",
+               .driver_name    = "ctr-aes-ccp",
+               .blocksize      = 1,
+               .ivsize         = AES_BLOCK_SIZE,
+               .alg_defaults   = &ccp_aes_defaults,
+       },
+       {
+               .mode           = CCP_AES_MODE_CTR,
+               .name           = "rfc3686(ctr(aes))",
+               .driver_name    = "rfc3686-ctr-aes-ccp",
+               .blocksize      = 1,
+               .ivsize         = CTR_RFC3686_IV_SIZE,
+               .alg_defaults   = &ccp_aes_rfc3686_defaults,
+       },
+};
+
+static int ccp_register_aes_alg(struct list_head *head,
+                               const struct ccp_aes_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);
+
+       ccp_alg->mode = def->mode;
+
+       /* Copy the defaults and override as necessary */
+       alg = &ccp_alg->alg;
+       memcpy(alg, def->alg_defaults, sizeof(*alg));
+       snprintf(alg->cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+       snprintf(alg->cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+                def->driver_name);
+       alg->cra_blocksize = def->blocksize;
+       alg->cra_ablkcipher.ivsize = def->ivsize;
+
+       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_algs(struct list_head *head)
+{
+       int i, ret;
+
+       for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
+               ret = ccp_register_aes_alg(head, &aes_algs[i]);
+               if (ret)
+                       return ret;
+       }
+
+       return 0;
+}