1/*
2 * CAAM/SEC 4.x functions for handling key-generation jobs
3 *
4 * Copyright 2008-2011 Freescale Semiconductor, Inc.
5 *
6 */
7#include "compat.h"
8#include "jr.h"
9#include "error.h"
10#include "desc_constr.h"
11#include "key_gen.h"
12
13void split_key_done(struct device *dev, u32 *desc, u32 err,
14			   void *context)
15{
16	struct split_key_result *res = context;
17
18#ifdef DEBUG
19	dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
20#endif
21
22	if (err)
23		caam_jr_strstatus(dev, err);
24
25	res->err = err;
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, int split_key_len,
45		  int split_key_pad_len, const u8 *key_in, u32 keylen,
46		  u32 alg_op)
47{
48	u32 *desc;
49	struct split_key_result result;
50	dma_addr_t dma_addr_in, dma_addr_out;
51	int ret = -ENOMEM;
52
53	desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
54	if (!desc) {
55		dev_err(jrdev, "unable to allocate key input memory\n");
56		return ret;
57	}
58
59	dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
60				     DMA_TO_DEVICE);
61	if (dma_mapping_error(jrdev, dma_addr_in)) {
62		dev_err(jrdev, "unable to map key input memory\n");
63		goto out_free;
64	}
65
66	dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len,
67				      DMA_FROM_DEVICE);
68	if (dma_mapping_error(jrdev, dma_addr_out)) {
69		dev_err(jrdev, "unable to map key output memory\n");
70		goto out_unmap_in;
71	}
72
73	init_job_desc(desc, 0);
74	append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
75
76	/* Sets MDHA up into an HMAC-INIT */
77	append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT);
78
79	/*
80	 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
81	 * into both pads inside MDHA
82	 */
83	append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
84				FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
85
86	/*
87	 * FIFO_STORE with the explicit split-key content store
88	 * (0x26 output type)
89	 */
90	append_fifo_store(desc, dma_addr_out, split_key_len,
91			  LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
92
93#ifdef DEBUG
94	print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
95		       DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
96	print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
97		       DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
98#endif
99
100	result.err = 0;
101	init_completion(&result.completion);
102
103	ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
104	if (!ret) {
105		/* in progress */
106		wait_for_completion_interruptible(&result.completion);
107		ret = result.err;
108#ifdef DEBUG
109		print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
110			       DUMP_PREFIX_ADDRESS, 16, 4, key_out,
111			       split_key_pad_len, 1);
112#endif
113	}
114
115	dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len,
116			 DMA_FROM_DEVICE);
117out_unmap_in:
118	dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
119out_free:
120	kfree(desc);
121	return ret;
122}
123EXPORT_SYMBOL(gen_split_key);
124