1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/crypto/caam/key_gen.c b/drivers/crypto/caam/key_gen.c
new file mode 100644
index 000000000..b0e8a4939
--- /dev/null
+++ b/drivers/crypto/caam/key_gen.c
@@ -0,0 +1,126 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * CAAM/SEC 4.x functions for handling key-generation jobs
+ *
+ * Copyright 2008-2011 Freescale Semiconductor, Inc.
+ *
+ */
+#include "compat.h"
+#include "jr.h"
+#include "error.h"
+#include "desc_constr.h"
+#include "key_gen.h"
+
+void split_key_done(struct device *dev, u32 *desc, u32 err,
+			   void *context)
+{
+	struct split_key_result *res = context;
+	int ecode = 0;
+
+	dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
+
+	if (err)
+		ecode = caam_jr_strstatus(dev, err);
+
+	res->err = ecode;
+
+	complete(&res->completion);
+}
+EXPORT_SYMBOL(split_key_done);
+/*
+get a split ipad/opad key
+
+Split key generation-----------------------------------------------
+
+[00] 0xb0810008    jobdesc: stidx=1 share=never len=8
+[01] 0x04000014        key: class2->keyreg len=20
+			@0xffe01000
+[03] 0x84410014  operation: cls2-op sha1 hmac init dec
+[04] 0x24940000     fifold: class2 msgdata-last2 len=0 imm
+[05] 0xa4000001       jump: class2 local all ->1 [06]
+[06] 0x64260028    fifostr: class2 mdsplit-jdk len=40
+			@0xffe04000
+*/
+int gen_split_key(struct device *jrdev, u8 *key_out,
+		  struct alginfo * const adata, const u8 *key_in, u32 keylen,
+		  int max_keylen)
+{
+	u32 *desc;
+	struct split_key_result result;
+	dma_addr_t dma_addr;
+	unsigned int local_max;
+	int ret = -ENOMEM;
+
+	adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
+	adata->keylen_pad = split_key_pad_len(adata->algtype &
+					      OP_ALG_ALGSEL_MASK);
+	local_max = max(keylen, adata->keylen_pad);
+
+	dev_dbg(jrdev, "split keylen %d split keylen padded %d\n",
+		adata->keylen, adata->keylen_pad);
+	print_hex_dump_debug("ctx.key@" __stringify(__LINE__)": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
+
+	if (local_max > max_keylen)
+		return -EINVAL;
+
+	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
+	if (!desc) {
+		dev_err(jrdev, "unable to allocate key input memory\n");
+		return ret;
+	}
+
+	memcpy(key_out, key_in, keylen);
+
+	dma_addr = dma_map_single(jrdev, key_out, local_max, DMA_BIDIRECTIONAL);
+	if (dma_mapping_error(jrdev, dma_addr)) {
+		dev_err(jrdev, "unable to map key memory\n");
+		goto out_free;
+	}
+
+	init_job_desc(desc, 0);
+	append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
+
+	/* Sets MDHA up into an HMAC-INIT */
+	append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
+			 OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
+			 OP_ALG_AS_INIT);
+
+	/*
+	 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
+	 * into both pads inside MDHA
+	 */
+	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
+				FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
+
+	/*
+	 * FIFO_STORE with the explicit split-key content store
+	 * (0x26 output type)
+	 */
+	append_fifo_store(desc, dma_addr, adata->keylen,
+			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
+
+	print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
+			     DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
+			     1);
+
+	result.err = 0;
+	init_completion(&result.completion);
+
+	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
+	if (ret == -EINPROGRESS) {
+		/* in progress */
+		wait_for_completion(&result.completion);
+		ret = result.err;
+
+		print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ",
+				     DUMP_PREFIX_ADDRESS, 16, 4, key_out,
+				     adata->keylen_pad, 1);
+	}
+
+	dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL);
+out_free:
+	kfree(desc);
+	return ret;
+}
+EXPORT_SYMBOL(gen_split_key);