Wire up the v3 CCP as a cipher provider.
Signed-off-by: Gary R Hook <gary.hook@xxxxxxx>
---
drivers/crypto/ccp/Makefile | 1
drivers/crypto/ccp/ccp-crypto-main.c | 21 ++
drivers/crypto/ccp/ccp-crypto-rsa.c | 286
++++++++++++++++++++++++++++++++++ drivers/crypto/ccp/ccp-crypto.h |
31 ++++
drivers/crypto/ccp/ccp-debugfs.c | 1
drivers/crypto/ccp/ccp-dev.c | 1
drivers/crypto/ccp/ccp-ops.c | 2
include/linux/ccp.h | 1
8 files changed, 341 insertions(+), 3 deletions(-)
create mode 100644 drivers/crypto/ccp/ccp-crypto-rsa.c
diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index 59493fd3a751..439bc2fcb464 100644
--- a/drivers/crypto/ccp/Makefile
+++ b/drivers/crypto/ccp/Makefile
@@ -15,4 +15,5 @@ ccp-crypto-objs := ccp-crypto-main.o \
ccp-crypto-aes-xts.o \
ccp-crypto-aes-galois.o \
ccp-crypto-des3.o \
+ ccp-crypto-rsa.o \
ccp-crypto-sha.o
diff --git a/drivers/crypto/ccp/ccp-crypto-main.c
b/drivers/crypto/ccp/ccp-crypto-main.c index 8dccbddabef1..dd7d00c680e7
100644
--- a/drivers/crypto/ccp/ccp-crypto-main.c
+++ b/drivers/crypto/ccp/ccp-crypto-main.c
@@ -17,6 +17,7 @@
#include <linux/ccp.h>
#include <linux/scatterlist.h>
#include <crypto/internal/hash.h>
+#include <crypto/internal/akcipher.h>
#include "ccp-crypto.h"
@@ -37,10 +38,15 @@
module_param(des3_disable, uint, 0444);
MODULE_PARM_DESC(des3_disable, "Disable use of 3DES - any non-zero value");
+static unsigned int rsa_disable;
+module_param(rsa_disable, uint, 0444);
+MODULE_PARM_DESC(rsa_disable, "Disable use of RSA - any non-zero value");
+
/* List heads for the supported algorithms */
static LIST_HEAD(hash_algs);
static LIST_HEAD(cipher_algs);
static LIST_HEAD(aead_algs);
+static LIST_HEAD(akcipher_algs);
/* For any tfm, requests for that tfm must be returned on the order
* received. With multiple queues available, the CCP can process more
@@ -358,6 +364,14 @@ static int ccp_register_algs(void)
return ret;
}
+ if (!rsa_disable) {
+ ret = ccp_register_rsa_algs(&akcipher_algs);
+ if (ret) {
+ rsa_disable = 1;
+ return ret;
+ }
+ }
+
return 0;
}
@@ -366,6 +380,7 @@ static void ccp_unregister_algs(void)
struct ccp_crypto_ahash_alg *ahash_alg, *ahash_tmp;
struct ccp_crypto_ablkcipher_alg *ablk_alg, *ablk_tmp;
struct ccp_crypto_aead *aead_alg, *aead_tmp;
+ struct ccp_crypto_akcipher_alg *akc_alg, *akc_tmp;
list_for_each_entry_safe(ahash_alg, ahash_tmp, &hash_algs, entry) {
crypto_unregister_ahash(&ahash_alg->alg);
@@ -384,6 +399,12 @@ static void ccp_unregister_algs(void)
list_del(&aead_alg->entry);
kfree(aead_alg);
}
+
+ list_for_each_entry_safe(akc_alg, akc_tmp, &akcipher_algs, entry) {
+ crypto_unregister_akcipher(&akc_alg->alg);
+ list_del(&akc_alg->entry);
+ kfree(akc_alg);
+ }
}
static int ccp_crypto_init(void)
diff --git a/drivers/crypto/ccp/ccp-crypto-rsa.c
b/drivers/crypto/ccp/ccp-crypto-rsa.c new file mode 100644
index 000000000000..4a2a71463594
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-rsa.c
@@ -0,0 +1,286 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) RSA crypto API support
+ *
+ * Copyright (C) 2016 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <gary.hook@xxxxxxx>
+ *
+ * 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/scatterlist.h>
+#include <linux/crypto.h>
+#include <crypto/algapi.h>
+#include <crypto/internal/rsa.h>
+#include <crypto/internal/akcipher.h>
+#include <crypto/akcipher.h>
+#include <crypto/scatterwalk.h>
+
+#include "ccp-crypto.h"
+
+static inline struct akcipher_request *akcipher_request_cast(
+ struct crypto_async_request *req)
+{
+ return container_of(req, struct akcipher_request, base);
+}
+
+static int ccp_rsa_complete(struct crypto_async_request *async_req, int
ret) +{
+ struct akcipher_request *req = akcipher_request_cast(async_req);
+ struct ccp_rsa_req_ctx *rctx = akcipher_request_ctx(req);
+
+ if (!ret)
+ req->dst_len = rctx->cmd.u.rsa.key_size >> 3;
+
+ ret = 0;
+
+ return ret;
+}
+
+static unsigned int ccp_rsa_maxsize(struct crypto_akcipher *tfm)
+{
+ return CCP_RSA_MAXMOD;
+}
+
+static int ccp_rsa_crypt(struct akcipher_request *req, bool encrypt)
+{
+ struct crypto_akcipher *tfm = crypto_akcipher_reqtfm(req);
+ struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct ccp_rsa_req_ctx *rctx = akcipher_request_ctx(req);
+ int ret = 0;
+
+ memset(&rctx->cmd, 0, sizeof(rctx->cmd));
+ INIT_LIST_HEAD(&rctx->cmd.entry);
+ rctx->cmd.engine = CCP_ENGINE_RSA;
+
+ rctx->cmd.u.rsa.key_size = ctx->u.rsa.key_len; /* in bits */
+ if (encrypt) {
+ rctx->cmd.u.rsa.exp = &ctx->u.rsa.e_sg;
+ rctx->cmd.u.rsa.exp_len = ctx->u.rsa.e_len;
+ } else {
+ rctx->cmd.u.rsa.exp = &ctx->u.rsa.d_sg;
+ rctx->cmd.u.rsa.exp_len = ctx->u.rsa.d_len;
+ }
+ rctx->cmd.u.rsa.mod = &ctx->u.rsa.n_sg;
+ rctx->cmd.u.rsa.mod_len = ctx->u.rsa.n_len;
+ rctx->cmd.u.rsa.src = req->src;
+ rctx->cmd.u.rsa.src_len = req->src_len;
+ rctx->cmd.u.rsa.dst = req->dst;
+
+ ret = ccp_crypto_enqueue_request(&req->base, &rctx->cmd);
+
+ return ret;
+}
+
+static int ccp_rsa_encrypt(struct akcipher_request *req)
+{
+ return ccp_rsa_crypt(req, true);
+}
+
+static int ccp_rsa_decrypt(struct akcipher_request *req)
+{
+ return ccp_rsa_crypt(req, false);
+}
+
+static int ccp_check_key_length(unsigned int len)
+{
+ /* In bits */
+ if (len < 8 || len > 4096)
+ return -EINVAL;
+ return 0;
+}
+
+static void ccp_rsa_free_key_bufs(struct ccp_ctx *ctx)
+{
+ /* Clean up old key data */
+ kfree(ctx->u.rsa.e_buf);
+ ctx->u.rsa.e_buf = NULL;
+ ctx->u.rsa.e_len = 0;
+ kfree(ctx->u.rsa.n_buf);
+ ctx->u.rsa.n_buf = NULL;
+ ctx->u.rsa.n_len = 0;
+ kfree(ctx->u.rsa.d_buf);
+ ctx->u.rsa.d_buf = NULL;
+ ctx->u.rsa.d_len = 0;
+}
+
+static int ccp_rsa_setkey(struct crypto_akcipher *tfm, const void *key,
+ unsigned int keylen, bool private)
+{
+ struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
+ struct rsa_key raw_key;
+ int key_len, i;
+ int ret;
+
+ ccp_rsa_free_key_bufs(ctx);
+ memset(&raw_key, 0, sizeof(raw_key));
+
+ /* Code borrowed from crypto/rsa.c */
+ if (private)
+ ret = rsa_parse_priv_key(&raw_key, key, keylen);
+ else
+ ret = rsa_parse_pub_key(&raw_key, key, keylen);
+ if (ret)
+ goto e_key;
+
+ /* Remove leading zeroes from the modulus (n) */
+ key_len = 0;
+ for (i = 0; i < raw_key.n_sz; i++)
+ if (raw_key.n[i]) {
+ key_len = raw_key.n_sz - i;
+ break;
+ }
+ ctx->u.rsa.key_len = key_len << 3; /* bits */
+ if (ccp_check_key_length(ctx->u.rsa.key_len)) {
+ ret = -EINVAL;
+ goto e_key;
+ }
+ ctx->u.rsa.n_len = key_len;
+ sg_init_one(&ctx->u.rsa.n_sg, raw_key.n + i, key_len);
+
+ /* Remove leading zeroes from the public key (e) */
+ key_len = 0;
+ for (i = 0; i < raw_key.e_sz; i++)
+ if (raw_key.e[i]) {
+ key_len = raw_key.e_sz - i;
+ break;
+ }
+ ctx->u.rsa.e_len = key_len;
+ sg_init_one(&ctx->u.rsa.e_sg, raw_key.e + i, key_len);
+
+ if (private) {
+ /* Remove leading zeroes from the private key (d) */
+ key_len = 0;
+ for (i = 0; i < raw_key.d_sz; i++)
+ if (raw_key.d[i]) {
+ key_len = raw_key.d_sz - i;
+ break;
+ }
+ ctx->u.rsa.d_len = key_len;
+ sg_init_one(&ctx->u.rsa.d_sg, raw_key.d + i, key_len);
