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 | |
14 | void 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 | } |
29 | EXPORT_SYMBOL(split_key_done); |
30 | /* |
31 | get a split ipad/opad key |
32 | |
33 | Split 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 | */ |
44 | int 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(hash: adata->algtype & OP_ALG_ALGSEL_MASK); |
55 | adata->keylen_pad = split_key_pad_len(hash: 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); |
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(dev: jrdev, dma_addr)) { |
77 | dev_err(jrdev, "unable to map key memory\n" ); |
78 | goto out_free; |
79 | } |
80 | |
81 | init_job_desc(desc, options: 0); |
82 | append_key(desc, ptr: dma_addr, len: keylen, CLASS_2 | KEY_DEST_CLASS_REG); |
83 | |
84 | /* Sets MDHA up into an HMAC-INIT */ |
85 | append_operation(desc, options: (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, len: 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, ptr: dma_addr, len: 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(x: &result.completion); |
109 | |
110 | ret = caam_jr_enqueue(dev: jrdev, desc, cbk: split_key_done, areq: &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); |
122 | out_free: |
123 | kfree(objp: desc); |
124 | return ret; |
125 | } |
126 | EXPORT_SYMBOL(gen_split_key); |
127 | |