GNU Linux-libre 4.19.314-gnu1
[releases.git] / drivers / crypto / caam / key_gen.c
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
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 }
30 EXPORT_SYMBOL(split_key_done);
31 /*
32 get a split ipad/opad key
33
34 Split 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 */
45 int 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_in, dma_addr_out;
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         dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
75                                      DMA_TO_DEVICE);
76         if (dma_mapping_error(jrdev, dma_addr_in)) {
77                 dev_err(jrdev, "unable to map key input memory\n");
78                 goto out_free;
79         }
80
81         dma_addr_out = dma_map_single(jrdev, key_out, adata->keylen_pad,
82                                       DMA_FROM_DEVICE);
83         if (dma_mapping_error(jrdev, dma_addr_out)) {
84                 dev_err(jrdev, "unable to map key output memory\n");
85                 goto out_unmap_in;
86         }
87
88         init_job_desc(desc, 0);
89         append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
90
91         /* Sets MDHA up into an HMAC-INIT */
92         append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
93                          OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
94                          OP_ALG_AS_INIT);
95
96         /*
97          * do a FIFO_LOAD of zero, this will trigger the internal key expansion
98          * into both pads inside MDHA
99          */
100         append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
101                                 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
102
103         /*
104          * FIFO_STORE with the explicit split-key content store
105          * (0x26 output type)
106          */
107         append_fifo_store(desc, dma_addr_out, adata->keylen,
108                           LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
109
110 #ifdef DEBUG
111         print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
112                        DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
113         print_hex_dump(KERN_ERR, "jobdesc@"__stringify(__LINE__)": ",
114                        DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
115 #endif
116
117         result.err = 0;
118         init_completion(&result.completion);
119
120         ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
121         if (!ret) {
122                 /* in progress */
123                 wait_for_completion(&result.completion);
124                 ret = result.err;
125 #ifdef DEBUG
126                 print_hex_dump(KERN_ERR, "ctx.key@"__stringify(__LINE__)": ",
127                                DUMP_PREFIX_ADDRESS, 16, 4, key_out,
128                                adata->keylen_pad, 1);
129 #endif
130         }
131
132         dma_unmap_single(jrdev, dma_addr_out, adata->keylen_pad,
133                          DMA_FROM_DEVICE);
134 out_unmap_in:
135         dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);
136 out_free:
137         kfree(desc);
138         return ret;
139 }
140 EXPORT_SYMBOL(gen_split_key);