Commit | Line | Data |
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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 | ||
fa9659cd MV |
22 | if (err) |
23 | caam_jr_strstatus(dev, err); | |
4c1ec1f9 YK |
24 | |
25 | res->err = err; | |
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 | */ | |
66b3e887 | 44 | int gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len, |
4c1ec1f9 YK |
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; | |
738459e3 | 51 | int ret = -ENOMEM; |
4c1ec1f9 YK |
52 | |
53 | desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA); | |
2af8f4a2 KP |
54 | if (!desc) { |
55 | dev_err(jrdev, "unable to allocate key input memory\n"); | |
738459e3 | 56 | return ret; |
2af8f4a2 | 57 | } |
4c1ec1f9 | 58 | |
4c1ec1f9 YK |
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"); | |
738459e3 | 63 | goto out_free; |
4c1ec1f9 | 64 | } |
738459e3 CS |
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); | |
4c1ec1f9 YK |
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 | */ | |
4c1ec1f9 YK |
90 | append_fifo_store(desc, dma_addr_out, split_key_len, |
91 | LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); | |
92 | ||
93 | #ifdef DEBUG | |
514df281 | 94 | print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", |
4c1ec1f9 | 95 | DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1); |
514df281 | 96 | print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ", |
4c1ec1f9 YK |
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 | |
514df281 | 109 | print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ", |
4c1ec1f9 YK |
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); | |
738459e3 | 117 | out_unmap_in: |
4c1ec1f9 | 118 | dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE); |
738459e3 | 119 | out_free: |
4c1ec1f9 | 120 | kfree(desc); |
4c1ec1f9 YK |
121 | return ret; |
122 | } | |
3b75a2c1 | 123 | EXPORT_SYMBOL(gen_split_key); |