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-rw-r--r--drivers/crypto/ccp/ccp-crypto-aes.c358
1 files changed, 358 insertions, 0 deletions
diff --git a/drivers/crypto/ccp/ccp-crypto-aes.c b/drivers/crypto/ccp/ccp-crypto-aes.c
new file mode 100644
index 0000000000..918e223f21
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-aes.c
@@ -0,0 +1,358 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Cryptographic Coprocessor (CCP) AES crypto API support
+ *
+ * Copyright (C) 2013-2019 Advanced Micro Devices, Inc.
+ *
+ * Author: Tom Lendacky <thomas.lendacky@amd.com>
+ */
+
+#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 skcipher_request *req = skcipher_request_cast(async_req);
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(
+ crypto_skcipher_reqtfm(req));
+ struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
+
+ if (ret)
+ return ret;
+
+ if (ctx->u.aes.mode != CCP_AES_MODE_ECB)
+ memcpy(req->iv, rctx->iv, AES_BLOCK_SIZE);
+
+ return 0;
+}
+
+static int ccp_aes_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct ccp_crypto_skcipher_alg *alg = ccp_crypto_skcipher_alg(tfm);
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(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:
+ 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 skcipher_request *req, bool encrypt)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
+ struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
+ struct scatterlist *iv_sg = NULL;
+ unsigned int iv_len = 0;
+
+ if (!ctx->u.aes.key_len)
+ return -EINVAL;
+
+ if (((ctx->u.aes.mode == CCP_AES_MODE_ECB) ||
+ (ctx->u.aes.mode == CCP_AES_MODE_CBC)) &&
+ (req->cryptlen & (AES_BLOCK_SIZE - 1)))
+ return -EINVAL;
+
+ if (ctx->u.aes.mode != CCP_AES_MODE_ECB) {
+ if (!req->iv)
+ return -EINVAL;
+
+ memcpy(rctx->iv, req->iv, 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->cryptlen;
+ rctx->cmd.u.aes.dst = req->dst;
+
+ return ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+}
+
+static int ccp_aes_encrypt(struct skcipher_request *req)
+{
+ return ccp_aes_crypt(req, true);
+}
+
+static int ccp_aes_decrypt(struct skcipher_request *req)
+{
+ return ccp_aes_crypt(req, false);
+}
+
+static int ccp_aes_init_tfm(struct crypto_skcipher *tfm)
+{
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
+
+ ctx->complete = ccp_aes_complete;
+ ctx->u.aes.key_len = 0;
+
+ crypto_skcipher_set_reqsize(tfm, sizeof(struct ccp_aes_req_ctx));
+
+ return 0;
+}
+
+static int ccp_aes_rfc3686_complete(struct crypto_async_request *async_req,
+ int ret)
+{
+ struct skcipher_request *req = skcipher_request_cast(async_req);
+ struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(req);
+
+ /* Restore the original pointer */
+ req->iv = rctx->rfc3686_info;
+
+ return ccp_aes_complete(async_req, ret);
+}
+
+static int ccp_aes_rfc3686_setkey(struct crypto_skcipher *tfm, const u8 *key,
+ unsigned int key_len)
+{
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(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 skcipher_request *req, bool encrypt)
+{
+ struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
+ struct ccp_aes_req_ctx *rctx = skcipher_request_ctx_dma(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->iv, CTR_RFC3686_IV_SIZE);
+
+ iv += CTR_RFC3686_IV_SIZE;
+ *(__be32 *)iv = cpu_to_be32(1);
+
+ /* Point to the new IV */
+ rctx->rfc3686_info = req->iv;
+ req->iv = rctx->rfc3686_iv;
+
+ return ccp_aes_crypt(req, encrypt);
+}
+
+static int ccp_aes_rfc3686_encrypt(struct skcipher_request *req)
+{
+ return ccp_aes_rfc3686_crypt(req, true);
+}
+
+static int ccp_aes_rfc3686_decrypt(struct skcipher_request *req)
+{
+ return ccp_aes_rfc3686_crypt(req, false);
+}
+
+static int ccp_aes_rfc3686_init_tfm(struct crypto_skcipher *tfm)
+{
+ struct ccp_ctx *ctx = crypto_skcipher_ctx_dma(tfm);
+
+ ctx->complete = ccp_aes_rfc3686_complete;
+ ctx->u.aes.key_len = 0;
+
+ crypto_skcipher_set_reqsize_dma(tfm, sizeof(struct ccp_aes_req_ctx));
+
+ return 0;
+}
+
+static const struct skcipher_alg ccp_aes_defaults = {
+ .setkey = ccp_aes_setkey,
+ .encrypt = ccp_aes_encrypt,
+ .decrypt = ccp_aes_decrypt,
+ .min_keysize = AES_MIN_KEY_SIZE,
+ .max_keysize = AES_MAX_KEY_SIZE,
+ .init = ccp_aes_init_tfm,
+
+ .base.cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_ALLOCATES_MEMORY |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = AES_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,
+ .base.cra_priority = CCP_CRA_PRIORITY,
+ .base.cra_module = THIS_MODULE,
+};
+
+static const struct skcipher_alg ccp_aes_rfc3686_defaults = {
+ .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,
+ .init = ccp_aes_rfc3686_init_tfm,
+
+ .base.cra_flags = CRYPTO_ALG_ASYNC |
+ CRYPTO_ALG_ALLOCATES_MEMORY |
+ CRYPTO_ALG_KERN_DRIVER_ONLY |
+ CRYPTO_ALG_NEED_FALLBACK,
+ .base.cra_blocksize = CTR_RFC3686_BLOCK_SIZE,
+ .base.cra_ctxsize = sizeof(struct ccp_ctx) + CRYPTO_DMA_PADDING,
+ .base.cra_priority = CCP_CRA_PRIORITY,
+ .base.cra_module = THIS_MODULE,
+};
+
+struct ccp_aes_def {
+ enum ccp_aes_mode mode;
+ unsigned int version;
+ const char *name;
+ const char *driver_name;
+ unsigned int blocksize;
+ unsigned int ivsize;
+ const struct skcipher_alg *alg_defaults;
+};
+
+static struct ccp_aes_def aes_algs[] = {
+ {
+ .mode = CCP_AES_MODE_ECB,
+ .version = CCP_VERSION(3, 0),
+ .name = "ecb(aes)",
+ .driver_name = "ecb-aes-ccp",
+ .blocksize = AES_BLOCK_SIZE,
+ .ivsize = 0,
+ .alg_defaults = &ccp_aes_defaults,
+ },
+ {
+ .mode = CCP_AES_MODE_CBC,
+ .version = CCP_VERSION(3, 0),
+ .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,
+ .version = CCP_VERSION(3, 0),
+ .name = "cfb(aes)",
+ .driver_name = "cfb-aes-ccp",
+ .blocksize = 1,
+ .ivsize = AES_BLOCK_SIZE,
+ .alg_defaults = &ccp_aes_defaults,
+ },
+ {
+ .mode = CCP_AES_MODE_OFB,
+ .version = CCP_VERSION(3, 0),
+ .name = "ofb(aes)",
+ .driver_name = "ofb-aes-ccp",
+ .blocksize = 1,
+ .ivsize = AES_BLOCK_SIZE,
+ .alg_defaults = &ccp_aes_defaults,
+ },
+ {
+ .mode = CCP_AES_MODE_CTR,
+ .version = CCP_VERSION(3, 0),
+ .name = "ctr(aes)",
+ .driver_name = "ctr-aes-ccp",
+ .blocksize = 1,
+ .ivsize = AES_BLOCK_SIZE,
+ .alg_defaults = &ccp_aes_defaults,
+ },
+ {
+ .mode = CCP_AES_MODE_CTR,
+ .version = CCP_VERSION(3, 0),
+ .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_skcipher_alg *ccp_alg;
+ struct skcipher_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;
+ *alg = *def->alg_defaults;
+ snprintf(alg->base.cra_name, CRYPTO_MAX_ALG_NAME, "%s", def->name);
+ snprintf(alg->base.cra_driver_name, CRYPTO_MAX_ALG_NAME, "%s",
+ def->driver_name);
+ alg->base.cra_blocksize = def->blocksize;
+ alg->ivsize = def->ivsize;
+
+ ret = crypto_register_skcipher(alg);
+ if (ret) {
+ pr_err("%s skcipher algorithm registration error (%d)\n",
+ alg->base.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;
+ unsigned int ccpversion = ccp_version();
+
+ for (i = 0; i < ARRAY_SIZE(aes_algs); i++) {
+ if (aes_algs[i].version > ccpversion)
+ continue;
+ ret = ccp_register_aes_alg(head, &aes_algs[i]);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}