1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * CAAM/SEC 4.x functions for handling key-generation jobs
  4 *
  5 * Copyright 2008-2011 Freescale Semiconductor, Inc.
  6 *
  7 */
  8#include "compat.h"
  9#include "jr.h"
 10#include "error.h"
 11#include "desc_constr.h"
 12#include "key_gen.h"
 13
 14void split_key_done(struct device *dev, u32 *desc, u32 err,
 15			   void *context)
 16{
 17	struct split_key_result *res = context;
 18	int ecode = 0;
 19
 20	dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
 21
 22	if (err)
 23		ecode = caam_jr_strstatus(dev, err);
 24
 25	res->err = ecode;
 26
 27	complete(&res->completion);
 28}
 29EXPORT_SYMBOL(split_key_done);
 30/*
 31get a split ipad/opad key
 32
 33Split key generation-----------------------------------------------
 34
 35[00] 0xb0810008    jobdesc: stidx=1 share=never len=8
 36[01] 0x04000014        key: class2->keyreg len=20
 37			@0xffe01000
 38[03] 0x84410014  operation: cls2-op sha1 hmac init dec
 39[04] 0x24940000     fifold: class2 msgdata-last2 len=0 imm
 40[05] 0xa4000001       jump: class2 local all ->1 [06]
 41[06] 0x64260028    fifostr: class2 mdsplit-jdk len=40
 42			@0xffe04000
 43*/
 44int gen_split_key(struct device *jrdev, u8 *key_out,
 45		  struct alginfo * const adata, const u8 *key_in, u32 keylen,
 46		  int max_keylen)
 47{
 48	u32 *desc;
 49	struct split_key_result result;
 50	dma_addr_t dma_addr;
 51	unsigned int local_max;
 52	int ret = -ENOMEM;
 53
 54	adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
 55	adata->keylen_pad = split_key_pad_len(adata->algtype &
 56					      OP_ALG_ALGSEL_MASK);
 57	local_max = max(keylen, adata->keylen_pad);
 58
 59	dev_dbg(jrdev, "split keylen %d split keylen padded %d\n",
 60		adata->keylen, adata->keylen_pad);
 61	print_hex_dump_debug("ctx.key@" __stringify(__LINE__)": ",
 62			     DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
 63
 64	if (local_max > max_keylen)
 65		return -EINVAL;
 66
 67	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
 68	if (!desc) {
 69		dev_err(jrdev, "unable to allocate key input memory\n");
 70		return ret;
 71	}
 72
 73	memcpy(key_out, key_in, keylen);
 74
 75	dma_addr = dma_map_single(jrdev, key_out, local_max, DMA_BIDIRECTIONAL);
 76	if (dma_mapping_error(jrdev, dma_addr)) {
 77		dev_err(jrdev, "unable to map key memory\n");
 78		goto out_free;
 79	}
 80
 81	init_job_desc(desc, 0);
 82	append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
 83
 84	/* Sets MDHA up into an HMAC-INIT */
 85	append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
 86			 OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
 87			 OP_ALG_AS_INIT);
 88
 89	/*
 90	 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
 91	 * into both pads inside MDHA
 92	 */
 93	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
 94				FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
 95
 96	/*
 97	 * FIFO_STORE with the explicit split-key content store
 98	 * (0x26 output type)
 99	 */
100	append_fifo_store(desc, dma_addr, adata->keylen,
101			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
102
103	print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
104			     DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
105			     1);
106
107	result.err = 0;
108	init_completion(&result.completion);
109
110	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
111	if (ret == -EINPROGRESS) {
112		/* in progress */
113		wait_for_completion(&result.completion);
114		ret = result.err;
115
116		print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ",
117				     DUMP_PREFIX_ADDRESS, 16, 4, key_out,
118				     adata->keylen_pad, 1);
119	}
120
121	dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL);
122out_free:
123	kfree(desc);
124	return ret;
125}
126EXPORT_SYMBOL(gen_split_key);