tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
19#ifdef DEBUG
20 dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
21#endif
22
23 if (err)
24 caam_jr_strstatus(dev, err);
25
26 res->err = err;
27
28 complete(&res->completion);
29}
30EXPORT_SYMBOL(split_key_done);
31/*
32get a split ipad/opad key
33
34Split key generation-----------------------------------------------
35
36[00] 0xb0810008 jobdesc: stidx=1 share=never len=8
37[01] 0x04000014 key: class2->keyreg len=20
38 @0xffe01000
39[03] 0x84410014 operation: cls2-op sha1 hmac init dec
40[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm
41[05] 0xa4000001 jump: class2 local all ->1 [06]
42[06] 0x64260028 fifostr: class2 mdsplit-jdk len=40
43 @0xffe04000
44*/
45int gen_split_key(struct device *jrdev, u8 *key_out,
46 struct alginfo * const adata, const u8 *key_in, u32 keylen,
47 int max_keylen)
48{
49 u32 *desc;
50 struct split_key_result result;
51 dma_addr_t dma_addr;
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
58#ifdef DEBUG
59 dev_err(jrdev, "split keylen %d split keylen padded %d\n",
60 adata->keylen, adata->keylen_pad);
61 print_hex_dump(KERN_ERR, "ctx.key@" __stringify(__LINE__)": ",
62 DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
63#endif
64
65 if (adata->keylen_pad > max_keylen)
66 return -EINVAL;
67
68 desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
69 if (!desc) {
70 dev_err(jrdev, "unable to allocate key input memory\n");
71 return ret;
72 }
73
74 memcpy(key_out, key_in, keylen);
75
76 dma_addr = dma_map_single(jrdev, key_out, adata->keylen_pad,
77 DMA_BIDIRECTIONAL);
78 if (dma_mapping_error(jrdev, dma_addr)) {
79 dev_err(jrdev, "unable to map key memory\n");
80 goto out_free;
81 }
82
83 init_job_desc(desc, 0);
84 append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
85
86 /* Sets MDHA up into an HMAC-INIT */
87 append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
88 OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
89 OP_ALG_AS_INIT);
90
91 /*
92 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
93 * into both pads inside MDHA
94 */
95 append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
96 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
97
98 /*
99 * FIFO_STORE with the explicit split-key content store
100 * (0x26 output type)
101 */
102 append_fifo_store(desc, dma_addr, adata->keylen,
103 LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
104
105#ifdef DEBUG
106 print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
107 DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
108#endif
109
110 result.err = 0;
111 init_completion(&result.completion);
112
113 ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
114 if (!ret) {
115 /* in progress */
116 wait_for_completion(&result.completion);
117 ret = result.err;
118#ifdef DEBUG
119 print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
120 DUMP_PREFIX_ADDRESS, 16, 4, key_out,
121 adata->keylen_pad, 1);
122#endif
123 }
124
125 dma_unmap_single(jrdev, dma_addr, adata->keylen_pad, DMA_BIDIRECTIONAL);
126out_free:
127 kfree(desc);
128 return ret;
129}
130EXPORT_SYMBOL(gen_split_key);