[PATCH 0/4] Enable RSA Support on the CCP

[PATCH 0/4] Enable RSA Support on the CCP

[Gary R Hook]

This series accomplishes the following:

 - Fix RSA support in the base CCP driver
 - Add the akcipher_set_reqsize() function
 - Enable RSA support in the crypto layer
 - Allow for a larger RSA modulus in a version 5 CCP

---

Gary R Hook (4):
      crypto: ccp - Fix base RSA function for version 5 CCPs
      crypto: Add akcipher_set_reqsize() function
      crypto: ccp - Add support for RSA on the CCP
      csrypto: ccp - Expand RSA support for a v5 ccp


 drivers/crypto/ccp/Makefile          |    1 
 drivers/crypto/ccp/ccp-crypto-main.c |   19 ++
 drivers/crypto/ccp/ccp-crypto-rsa.c  |  299 ++++++++++++++++++++++++++++++++++
 drivers/crypto/ccp/ccp-crypto.h      |   32 ++++
 drivers/crypto/ccp/ccp-dev-v3.c      |    1 
 drivers/crypto/ccp/ccp-dev-v5.c      |   12 +
 drivers/crypto/ccp/ccp-dev.h         |    1 
 drivers/crypto/ccp/ccp-ops.c         |   81 ++++++---
 drivers/crypto/ccp/sp-dev.h          |    1 
 9 files changed, 412 insertions(+), 35 deletions(-)
 create mode 100644 drivers/crypto/ccp/ccp-crypto-rsa.c

[PATCH 1/4] crypto: ccp - Fix base RSA function for version 5 CCPs

[Gary R Hook]

Version 5 devices have requirements for buffer lengths, as well as
parameter format (e.g. bits vs. bytes). Fix the base CCP driver
code to meet requirements all supported versions.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/crypto/ccp/ccp-dev-v5.c |   10 +++--
 drivers/crypto/ccp/ccp-ops.c    |   78 +++++++++++++++++++++++++--------------
 2 files changed, 54 insertions(+), 34 deletions(-)

diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index 11febe2bd07c..b77ac0a638d5 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -471,7 +471,7 @@ static int ccp5_perform_rsa(struct ccp_op *op)
 	CCP5_CMD_PROT(&desc) = 0;
 
 	function.raw = 0;
-	CCP_RSA_SIZE(&function) = op->u.rsa.mod_size >> 3;
+	CCP_RSA_SIZE(&function) = (op->u.rsa.mod_size + 7) >> 3;
 	CCP5_CMD_FUNCTION(&desc) = function.raw;
 
 	CCP5_CMD_LEN(&desc) = op->u.rsa.input_len;
@@ -486,10 +486,10 @@ static int ccp5_perform_rsa(struct ccp_op *op)
 	CCP5_CMD_DST_HI(&desc) = ccp_addr_hi(&op->dst.u.dma);
 	CCP5_CMD_DST_MEM(&desc) = CCP_MEMTYPE_SYSTEM;
 
-	/* Exponent is in LSB memory */
-	CCP5_CMD_KEY_LO(&desc) = op->sb_key * LSB_ITEM_SIZE;
-	CCP5_CMD_KEY_HI(&desc) = 0;
-	CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SB;
+	/* Key (Exponent) is in external memory */
+	CCP5_CMD_KEY_LO(&desc) = ccp_addr_lo(&op->exp.u.dma);
+	CCP5_CMD_KEY_HI(&desc) = ccp_addr_hi(&op->exp.u.dma);
+	CCP5_CMD_KEY_MEM(&desc) = CCP_MEMTYPE_SYSTEM;
 
 	return ccp5_do_cmd(&desc, op->cmd_q);
 }
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index d1be07884a9b..72c0f938abd7 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -1765,8 +1765,7 @@ static int ccp_run_sha_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 {
 	struct ccp_rsa_engine *rsa = &cmd->u.rsa;
-	struct ccp_dm_workarea exp, src;
-	struct ccp_data dst;
+	struct ccp_dm_workarea exp, src, dst;
 	struct ccp_op op;
 	unsigned int sb_count, i_len, o_len;
 	int ret;
@@ -1777,30 +1776,40 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)
 		return -EINVAL;
 
+	memset(&op, 0, sizeof(op));
+	op.cmd_q = cmd_q;
+	op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
+
 	/* The RSA modulus must precede the message being acted upon, so
 	 * it must be copied to a DMA area where the message and the
 	 * modulus can be concatenated.  Therefore the input buffer
 	 * length required is twice the output buffer length (which
-	 * must be a multiple of 256-bits).
+	 * must be a multiple of 256-bits).  Compute o_len, i_len in bytes.
+	 * Buffer sizes must be a multiple of 32 bytes; rounding up may be
+	 * required.
 	 */
-	o_len = ((rsa->key_size + 255) / 256) * 32;
+	o_len = 32 * ((rsa->key_size + 255) / 256);
 	i_len = o_len * 2;
 
-	sb_count = o_len / CCP_SB_BYTES;
-
-	memset(&op, 0, sizeof(op));
-	op.cmd_q = cmd_q;
-	op.jobid = CCP_NEW_JOBID(cmd_q->ccp);
-	op.sb_key = cmd_q->ccp->vdata->perform->sballoc(cmd_q, sb_count);
-
-	if (!op.sb_key)
-		return -EIO;
+	if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0)) {
+		/* sb_count is the number of storage block slots required
+		 * for the modulus.
+		 */
+		sb_count = o_len / CCP_SB_BYTES;
+		op.sb_key = cmd_q->ccp->vdata->perform->sballoc(cmd_q,
+								sb_count);
+		if (!op.sb_key)
+			return -EIO;
+	} else {
+		/* A version 5 device allows a modulus size that will not fit
+		 * in the LSB, so the command will transfer it from memory.
+		 * Set the sb key to the default, even though it's not used.
+		 */
+		op.sb_key = cmd_q->sb_key;
+	}
 
-	/* The RSA exponent may span multiple (32-byte) SB entries and must
-	 * be in little endian format. Reverse copy each 32-byte chunk
-	 * of the exponent (En chunk to E0 chunk, E(n-1) chunk to E1 chunk)
-	 * and each byte within that chunk and do not perform any byte swap
-	 * operations on the passthru operation.
+	/* The RSA exponent must be in little endian format. Reverse its
+	 * byte order.
 	 */
 	ret = ccp_init_dm_workarea(&exp, cmd_q, o_len, DMA_TO_DEVICE);
 	if (ret)
@@ -1809,11 +1818,22 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	ret = ccp_reverse_set_dm_area(&exp, 0, rsa->exp, 0, rsa->exp_len);
 	if (ret)
 		goto e_exp;
-	ret = ccp_copy_to_sb(cmd_q, &exp, op.jobid, op.sb_key,
-			     CCP_PASSTHRU_BYTESWAP_NOOP);
-	if (ret) {
-		cmd->engine_error = cmd_q->cmd_error;
-		goto e_exp;
+
+	if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0)) {
+		/* Copy the exponent to the local storage block, using
+		 * as many 32-byte blocks as were allocated above. It's
+		 * already little endian, so no further change is required.
+		 */
+		ret = ccp_copy_to_sb(cmd_q, &exp, op.jobid, op.sb_key,
+				     CCP_PASSTHRU_BYTESWAP_NOOP);
+		if (ret) {
+			cmd->engine_error = cmd_q->cmd_error;
+			goto e_exp;
+		}
+	} else {
+		/* The exponent can be retrieved from memory via DMA. */
+		op.exp.u.dma.address = exp.dma.address;
+		op.exp.u.dma.offset = 0;
 	}
 
 	/* Concatenate the modulus and the message. Both the modulus and
@@ -1832,8 +1852,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 		goto e_src;
 
 	/* Prepare the output area for the operation */
-	ret = ccp_init_data(&dst, cmd_q, rsa->dst, rsa->mod_len,
-			    o_len, DMA_FROM_DEVICE);
+	ret = ccp_init_dm_workarea(&dst, cmd_q, o_len, DMA_FROM_DEVICE);
 	if (ret)
 		goto e_src;
 
@@ -1841,7 +1860,7 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	op.src.u.dma.address = src.dma.address;
 	op.src.u.dma.offset = 0;
 	op.src.u.dma.length = i_len;
-	op.dst.u.dma.address = dst.dm_wa.dma.address;
+	op.dst.u.dma.address = dst.dma.address;
 	op.dst.u.dma.offset = 0;
 	op.dst.u.dma.length = o_len;
 
@@ -1854,10 +1873,10 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 		goto e_dst;
 	}
 
-	ccp_reverse_get_dm_area(&dst.dm_wa, 0, rsa->dst, 0, rsa->mod_len);
+	ccp_reverse_get_dm_area(&dst, 0, rsa->dst, 0, rsa->mod_len);
 
 e_dst:
-	ccp_free_data(&dst, cmd_q);
+	ccp_dm_free(&dst);
 
 e_src:
 	ccp_dm_free(&src);
@@ -1866,7 +1885,8 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	ccp_dm_free(&exp);
 
 e_sb:
-	cmd_q->ccp->vdata->perform->sbfree(cmd_q, op.sb_key, sb_count);
+	if (cmd_q->ccp->vdata->version < CCP_VERSION(5, 0))
+		cmd_q->ccp->vdata->perform->sbfree(cmd_q, op.sb_key, sb_count);
 
 	return ret;
 }

[PATCH 2/4] crypto: Add akcipher_set_reqsize() function

[Gary R Hook]

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 0 files changed

diff --git a/include/crypto/internal/akcipher.h b/include/crypto/internal/akcipher.h
index 479a0078f0f7..805686ba2be4 100644
--- a/include/crypto/internal/akcipher.h
+++ b/include/crypto/internal/akcipher.h
@@ -38,6 +38,12 @@ static inline void *akcipher_request_ctx(struct akcipher_request *req)
 	return req->__ctx;
 }
 
+static inline void akcipher_set_reqsize(struct crypto_akcipher *akcipher,
+					unsigned int reqsize)
+{
+	crypto_akcipher_alg(akcipher)->reqsize = reqsize;
+}
+
 static inline void *akcipher_tfm_ctx(struct crypto_akcipher *tfm)
 {
 	return tfm->base.__crt_ctx;

[PATCH 3/4] crypto: ccp - Add support for RSA on the CCP

[Gary R Hook]

Wire up the CCP as an RSA cipher provider.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/crypto/ccp/Makefile          |    1 
 drivers/crypto/ccp/ccp-crypto-main.c |   19 ++
 drivers/crypto/ccp/ccp-crypto-rsa.c  |  296 ++++++++++++++++++++++++++++++++++
 drivers/crypto/ccp/ccp-crypto.h      |   31 ++++
 4 files changed, 347 insertions(+)
 create mode 100644 drivers/crypto/ccp/ccp-crypto-rsa.c

diff --git a/drivers/crypto/ccp/Makefile b/drivers/crypto/ccp/Makefile
index 5f2adc5facfe..57f8debfcfb3 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 78b9d26a381f..35a9de7fd475 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 @@ static unsigned int des3_disable;
 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 +364,12 @@ static int ccp_register_algs(void)
 			return ret;
 	}
 
+	if (!rsa_disable) {
+		ret = ccp_register_rsa_algs(&akcipher_algs);
+		if (ret)
+			return ret;
+	}
+
 	return 0;
 }
 
@@ -366,6 +378,7 @@ 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 +397,12 @@ 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..d5544943f5f0
--- /dev/null
+++ b/drivers/crypto/ccp/ccp-crypto-rsa.c
@@ -0,0 +1,296 @@
+/*
+ * AMD Cryptographic Coprocessor (CCP) RSA crypto API support
+ *
+ * Copyright (C) 2017 Advanced Micro Devices, Inc.
+ *
+ * Author: Gary R Hook <gary.hook@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/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 inline int ccp_copy_and_save_keypart(u8 **kpbuf, unsigned int *kplen,
+					    const u8 *buf, size_t sz)
+{
+	int nskip;
+
+	for (nskip = 0; nskip < sz; nskip++)
+		if (buf[nskip])
+			break;
+	*kplen = sz - nskip;
+	*kpbuf = kzalloc(*kplen, GFP_KERNEL);
+	if (!*kpbuf)
+		return -ENOMEM;
+	memcpy(*kpbuf, buf + nskip, *kplen);
+
+	return 0;
+}
+
+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)
+		return ret;
+
+	req->dst_len = rctx->cmd.u.rsa.key_size >> 3;
+
+	return 0;
+}
+
+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 */
+	kzfree(ctx->u.rsa.e_buf);
+	ctx->u.rsa.e_buf = NULL;
+	ctx->u.rsa.e_len = 0;
+	kzfree(ctx->u.rsa.n_buf);
+	ctx->u.rsa.n_buf = NULL;
+	ctx->u.rsa.n_len = 0;
+	kzfree(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 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 n_key;
+
+	ret = ccp_copy_and_save_keypart(&ctx->u.rsa.n_buf, &ctx->u.rsa.n_len,
+					raw_key.n, raw_key.n_sz);
+	if (ret)
+		goto key_err;
+	sg_init_one(&ctx->u.rsa.n_sg, ctx->u.rsa.n_buf, ctx->u.rsa.n_len);
+
+	ctx->u.rsa.key_len = ctx->u.rsa.n_len << 3; /* convert to bits */
+	if (ccp_check_key_length(ctx->u.rsa.key_len)) {
+		ret = -EINVAL;
+		goto key_err;
+	}
+
+	ret = ccp_copy_and_save_keypart(&ctx->u.rsa.e_buf, &ctx->u.rsa.e_len,
+					raw_key.e, raw_key.e_sz);
+	if (ret)
+		goto key_err;
+	sg_init_one(&ctx->u.rsa.e_sg, ctx->u.rsa.e_buf, ctx->u.rsa.e_len);
+
+	if (private) {
+		ret = ccp_copy_and_save_keypart(&ctx->u.rsa.d_buf,
+						&ctx->u.rsa.d_len,
+						raw_key.d, raw_key.d_sz);
+		if (ret)
+			goto key_err;
+		sg_init_one(&ctx->u.rsa.d_sg,
+			    ctx->u.rsa.d_buf, ctx->u.rsa.d_len);
+	}
+
+	return 0;
+
+key_err:
+	ccp_rsa_free_key_bufs(ctx);
+
+n_key:
+	return ret;
+}
+
+static int ccp_rsa_setprivkey(struct crypto_akcipher *tfm, const void *key,
+			      unsigned int keylen)
+{
+	return ccp_rsa_setkey(tfm, key, keylen, true);
+}
+
+static int ccp_rsa_setpubkey(struct crypto_akcipher *tfm, const void *key,
+			     unsigned int keylen)
+{
+	return ccp_rsa_setkey(tfm, key, keylen, false);
+}
+
+static int ccp_rsa_init_tfm(struct crypto_akcipher *tfm)
+{
+	struct ccp_ctx *ctx = akcipher_tfm_ctx(tfm);
+
+	akcipher_set_reqsize(tfm, sizeof(struct ccp_rsa_req_ctx));
+	ctx->complete = ccp_rsa_complete;
+
+	return 0;
+}
+
+static void ccp_rsa_exit_tfm(struct crypto_akcipher *tfm)
+{
+	struct ccp_ctx *ctx = crypto_tfm_ctx(&tfm->base);
+
+	ccp_rsa_free_key_bufs(ctx);
+}
+
+static struct akcipher_alg ccp_rsa_defaults = {
+	.encrypt = ccp_rsa_encrypt,
+	.decrypt = ccp_rsa_decrypt,
+	.sign = ccp_rsa_decrypt,
+	.verify = ccp_rsa_encrypt,
+	.set_pub_key = ccp_rsa_setpubkey,
+	.set_priv_key = ccp_rsa_setprivkey,
+	.max_size = ccp_rsa_maxsize,
+	.init = ccp_rsa_init_tfm,
+	.exit = ccp_rsa_exit_tfm,
+	.base = {
+		.cra_name = "rsa",
+		.cra_driver_name = "rsa-ccp",
+		.cra_priority = CCP_CRA_PRIORITY,
+		.cra_module = THIS_MODULE,
+		.cra_ctxsize = 2 * sizeof(struct ccp_ctx),
+	},
+};
+
+struct ccp_rsa_def {
+	unsigned int version;
+	const char *name;
+	const char *driver_name;
+	unsigned int reqsize;
+	struct akcipher_alg *alg_defaults;
+};
+
+static struct ccp_rsa_def rsa_algs[] = {
+	{
+		.version	= CCP_VERSION(3, 0),
+		.name		= "rsa",
+		.driver_name	= "rsa-ccp",
+		.reqsize	= sizeof(struct ccp_rsa_req_ctx),
+		.alg_defaults	= &ccp_rsa_defaults,
+	}
+};
+
+int ccp_register_rsa_alg(struct list_head *head, const struct ccp_rsa_def *def)
+{
+	struct ccp_crypto_akcipher_alg *ccp_alg;
+	struct akcipher_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;
+	*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);
+	ret = crypto_register_akcipher(alg);
+	if (ret) {
+		pr_err("%s akcipher 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_rsa_algs(struct list_head *head)
+{
+	int i, ret;
+	unsigned int ccpversion = ccp_version();
+
+	/* Register the RSA algorithm in standard mode
+	 * This works for CCP v3 and later
+	 */
+	for (i = 0; i < ARRAY_SIZE(rsa_algs); i++) {
+		if (rsa_algs[i].version > ccpversion)
+			continue;
+		ret = ccp_register_rsa_alg(head, &rsa_algs[i]);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index 156b8233853f..aa53b97f6f00 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -24,6 +24,8 @@
 #include <crypto/ctr.h>
 #include <crypto/hash.h>
 #include <crypto/sha.h>
+#include <crypto/akcipher.h>
+#include <crypto/internal/rsa.h>
 
 #define	CCP_LOG_LEVEL	KERN_INFO
 
@@ -58,6 +60,12 @@ struct ccp_crypto_ahash_alg {
 	struct ahash_alg alg;
 };
 
+struct ccp_crypto_akcipher_alg {
+	struct list_head entry;
+
+	struct akcipher_alg alg;
+};
+
 static inline struct ccp_crypto_ablkcipher_alg *
 	ccp_crypto_ablkcipher_alg(struct crypto_tfm *tfm)
 {
@@ -227,12 +235,34 @@ struct ccp_sha_exp_ctx {
 	u8 buf[MAX_SHA_BLOCK_SIZE];
 };
 
+/***** RSA related defines *****/
+
+struct ccp_rsa_ctx {
+	unsigned int key_len; /* in bits */
+	struct scatterlist e_sg;
+	u8 *e_buf;
+	unsigned int e_len;
+	struct scatterlist n_sg;
+	u8 *n_buf;
+	unsigned int n_len;
+	struct scatterlist d_sg;
+	u8 *d_buf;
+	unsigned int d_len;
+};
+
+struct ccp_rsa_req_ctx {
+	struct ccp_cmd cmd;
+};
+
+#define	CCP_RSA_MAXMOD	(4 * 1024 / 8)
+
 /***** Common Context Structure *****/
 struct ccp_ctx {
 	int (*complete)(struct crypto_async_request *req, int ret);
 
 	union {
 		struct ccp_aes_ctx aes;
+		struct ccp_rsa_ctx rsa;
 		struct ccp_sha_ctx sha;
 		struct ccp_des3_ctx des3;
 	} u;
@@ -249,5 +279,6 @@ int ccp_register_aes_xts_algs(struct list_head *head);
 int ccp_register_aes_aeads(struct list_head *head);
 int ccp_register_sha_algs(struct list_head *head);
 int ccp_register_des3_algs(struct list_head *head);
+int ccp_register_rsa_algs(struct list_head *head);
 
 #endif

[PATCH 4/4] csrypto: ccp - Expand RSA support for a v5 ccp

[Gary R Hook]

A version 5 CCP can handle an RSA modulus up to 16k bits.

Signed-off-by: Gary R Hook <gary.hook@amd.com>
---
 drivers/crypto/ccp/ccp-crypto-rsa.c |    5 ++++-
 drivers/crypto/ccp/ccp-crypto.h     |    1 +
 drivers/crypto/ccp/ccp-dev-v3.c     |    1 +
 drivers/crypto/ccp/ccp-dev-v5.c     |    2 ++
 drivers/crypto/ccp/ccp-dev.h        |    1 +
 drivers/crypto/ccp/ccp-ops.c        |    3 ++-
 drivers/crypto/ccp/sp-dev.h         |    1 +
 7 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/ccp/ccp-crypto-rsa.c b/drivers/crypto/ccp/ccp-crypto-rsa.c
index d5544943f5f0..e6db8672d89c 100644
--- a/drivers/crypto/ccp/ccp-crypto-rsa.c
+++ b/drivers/crypto/ccp/ccp-crypto-rsa.c
@@ -60,7 +60,10 @@ static int ccp_rsa_complete(struct crypto_async_request *async_req, int ret)
 
 static unsigned int ccp_rsa_maxsize(struct crypto_akcipher *tfm)
 {
-	return CCP_RSA_MAXMOD;
+	if (ccp_version() > CCP_VERSION(3, 0))
+		return CCP5_RSA_MAXMOD;
+	else
+		return CCP_RSA_MAXMOD;
 }
 
 static int ccp_rsa_crypt(struct akcipher_request *req, bool encrypt)
diff --git a/drivers/crypto/ccp/ccp-crypto.h b/drivers/crypto/ccp/ccp-crypto.h
index aa53b97f6f00..67c7620029e3 100644
--- a/drivers/crypto/ccp/ccp-crypto.h
+++ b/drivers/crypto/ccp/ccp-crypto.h
@@ -255,6 +255,7 @@ struct ccp_rsa_req_ctx {
 };
 
 #define	CCP_RSA_MAXMOD	(4 * 1024 / 8)
+#define	CCP5_RSA_MAXMOD	(16 * 1024 / 8)
 
 /***** Common Context Structure *****/
 struct ccp_ctx {
diff --git a/drivers/crypto/ccp/ccp-dev-v3.c b/drivers/crypto/ccp/ccp-dev-v3.c
index c2861749e2ad..240bebbcb8ac 100644
--- a/drivers/crypto/ccp/ccp-dev-v3.c
+++ b/drivers/crypto/ccp/ccp-dev-v3.c
@@ -597,4 +597,5 @@ const struct ccp_vdata ccpv3 = {
 	.setup = NULL,
 	.perform = &ccp3_actions,
 	.offset = 0x20000,
+	.rsamax = CCP_RSA_MAX_WIDTH,
 };
diff --git a/drivers/crypto/ccp/ccp-dev-v5.c b/drivers/crypto/ccp/ccp-dev-v5.c
index b77ac0a638d5..3f574d50c0f8 100644
--- a/drivers/crypto/ccp/ccp-dev-v5.c
+++ b/drivers/crypto/ccp/ccp-dev-v5.c
@@ -1114,6 +1114,7 @@ const struct ccp_vdata ccpv5a = {
 	.setup = ccp5_config,
 	.perform = &ccp5_actions,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };
 
 const struct ccp_vdata ccpv5b = {
@@ -1122,4 +1123,5 @@ const struct ccp_vdata ccpv5b = {
 	.setup = ccp5other_config,
 	.perform = &ccp5_actions,
 	.offset = 0x0,
+	.rsamax = CCP5_RSA_MAX_WIDTH,
 };
diff --git a/drivers/crypto/ccp/ccp-dev.h b/drivers/crypto/ccp/ccp-dev.h
index 3d51180199ac..6810b65c1939 100644
--- a/drivers/crypto/ccp/ccp-dev.h
+++ b/drivers/crypto/ccp/ccp-dev.h
@@ -203,6 +203,7 @@
 #define CCP_SHA_SB_COUNT		1
 
 #define CCP_RSA_MAX_WIDTH		4096
+#define CCP5_RSA_MAX_WIDTH		16384
 
 #define CCP_PASSTHRU_BLOCKSIZE		256
 #define CCP_PASSTHRU_MASKSIZE		32
diff --git a/drivers/crypto/ccp/ccp-ops.c b/drivers/crypto/ccp/ccp-ops.c
index 72c0f938abd7..c269f41e0526 100644
--- a/drivers/crypto/ccp/ccp-ops.c
+++ b/drivers/crypto/ccp/ccp-ops.c
@@ -1770,7 +1770,8 @@ static int ccp_run_rsa_cmd(struct ccp_cmd_queue *cmd_q, struct ccp_cmd *cmd)
 	unsigned int sb_count, i_len, o_len;
 	int ret;
 
-	if (rsa->key_size > CCP_RSA_MAX_WIDTH)
+	/* Check against the maximum allowable size, in bits */
+	if (rsa->key_size > cmd_q->ccp->vdata->rsamax)
 		return -EINVAL;
 
 	if (!rsa->exp || !rsa->mod || !rsa->src || !rsa->dst)
diff --git a/drivers/crypto/ccp/sp-dev.h b/drivers/crypto/ccp/sp-dev.h
index 3520da4e20cf..5ab486ade1ad 100644
--- a/drivers/crypto/ccp/sp-dev.h
+++ b/drivers/crypto/ccp/sp-dev.h
@@ -40,6 +40,7 @@ struct ccp_vdata {
 	void (*setup)(struct ccp_device *);
 	const struct ccp_actions *perform;
 	const unsigned int offset;
+	const unsigned int rsamax;
 };
 /* Structure to hold SP device data */
 struct sp_dev_vdata {

Re: [PATCH 0/4] Enable RSA Support on the CCP

[Herbert Xu]

On Mon, Jul 17, 2017 at 03:16:02PM -0500, Gary R Hook wrote:
> This series accomplishes the following:
> 
>  - Fix RSA support in the base CCP driver
>  - Add the akcipher_set_reqsize() function
>  - Enable RSA support in the crypto layer
>  - Allow for a larger RSA modulus in a version 5 CCP
> 
> ---
> 
> Gary R Hook (4):
>       crypto: ccp - Fix base RSA function for version 5 CCPs
>       crypto: Add akcipher_set_reqsize() function
>       crypto: ccp - Add support for RSA on the CCP
>       csrypto: ccp - Expand RSA support for a v5 ccp

All patches applied.  Thanks.
-- 
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt