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4c1ec1f9 YK |
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 | ||
13 | void 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 | char tmp[CAAM_ERROR_STR_MAX]; | |
24 | ||
25 | dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err)); | |
26 | } | |
27 | ||
28 | res->err = err; | |
29 | ||
30 | complete(&res->completion); | |
31 | } | |
32 | EXPORT_SYMBOL(split_key_done); | |
33 | /* | |
34 | get a split ipad/opad key | |
35 | ||
36 | Split key generation----------------------------------------------- | |
37 | ||
38 | [00] 0xb0810008 jobdesc: stidx=1 share=never len=8 | |
39 | [01] 0x04000014 key: class2->keyreg len=20 | |
40 | @0xffe01000 | |
41 | [03] 0x84410014 operation: cls2-op sha1 hmac init dec | |
42 | [04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm | |
43 | [05] 0xa4000001 jump: class2 local all ->1 [06] | |
44 | [06] 0x64260028 fifostr: class2 mdsplit-jdk len=40 | |
45 | @0xffe04000 | |
46 | */ | |
66b3e887 | 47 | int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, |
4c1ec1f9 YK |
48 | int split_key_pad_len, const u8 *key_in, u32 keylen, |
49 | u32 alg_op) | |
50 | { | |
51 | u32 *desc; | |
52 | struct split_key_result result; | |
53 | dma_addr_t dma_addr_in, dma_addr_out; | |
54 | int ret = 0; | |
55 | ||
56 | desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA); | |
2af8f4a2 KP |
57 | if (!desc) { |
58 | dev_err(jrdev, "unable to allocate key input memory\n"); | |
59 | return -ENOMEM; | |
60 | } | |
4c1ec1f9 YK |
61 | |
62 | init_job_desc(desc, 0); | |
63 | ||
64 | dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen, | |
65 | DMA_TO_DEVICE); | |
66 | if (dma_mapping_error(jrdev, dma_addr_in)) { | |
67 | dev_err(jrdev, "unable to map key input memory\n"); | |
68 | kfree(desc); | |
69 | return -ENOMEM; | |
70 | } | |
71 | append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG); | |
72 | ||
73 | /* Sets MDHA up into an HMAC-INIT */ | |
74 | append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT); | |
75 | ||
76 | /* | |
77 | * do a FIFO_LOAD of zero, this will trigger the internal key expansion | |
78 | * into both pads inside MDHA | |
79 | */ | |
80 | append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB | | |
81 | FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2); | |
82 | ||
83 | /* | |
84 | * FIFO_STORE with the explicit split-key content store | |
85 | * (0x26 output type) | |
86 | */ | |
87 | dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len, | |
88 | DMA_FROM_DEVICE); | |
89 | if (dma_mapping_error(jrdev, dma_addr_out)) { | |
90 | dev_err(jrdev, "unable to map key output memory\n"); | |
91 | kfree(desc); | |
92 | return -ENOMEM; | |
93 | } | |
94 | append_fifo_store(desc, dma_addr_out, split_key_len, | |
95 | LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); | |
96 | ||
97 | #ifdef DEBUG | |
514df281 | 98 | print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", |
4c1ec1f9 | 99 | DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1); |
514df281 | 100 | print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ", |
4c1ec1f9 YK |
101 | DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1); |
102 | #endif | |
103 | ||
104 | result.err = 0; | |
105 | init_completion(&result.completion); | |
106 | ||
107 | ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result); | |
108 | if (!ret) { | |
109 | /* in progress */ | |
110 | wait_for_completion_interruptible(&result.completion); | |
111 | ret = result.err; | |
112 | #ifdef DEBUG | |
514df281 | 113 | print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", |
4c1ec1f9 YK |
114 | DUMP_PREFIX_ADDRESS, 16, 4, key_out, |
115 | split_key_pad_len, 1); | |
116 | #endif | |
117 | } | |
118 | ||
119 | dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len, | |
120 | DMA_FROM_DEVICE); | |
121 | dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE); | |
122 | ||
123 | kfree(desc); | |
124 | ||
125 | return ret; | |
126 | } | |
3b75a2c1 | 127 | EXPORT_SYMBOL(gen_split_key); |