1 // SPDX-License-Identifier: GPL-2.0
3 * CAAM/SEC 4.x functions for handling key-generation jobs
5 * Copyright 2008-2011 Freescale Semiconductor, Inc.
11 #include "desc_constr.h"
14 void split_key_done(struct device *dev, u32 *desc, u32 err,
17 struct split_key_result *res = context;
20 dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
23 ecode = caam_jr_strstatus(dev, err);
27 complete(&res->completion);
29 EXPORT_SYMBOL(split_key_done);
31 get a split ipad/opad key
33 Split key generation-----------------------------------------------
35 [00] 0xb0810008 jobdesc: stidx=1 share=never len=8
36 [01] 0x04000014 key: class2->keyreg len=20
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
44 int gen_split_key(struct device *jrdev, u8 *key_out,
45 struct alginfo * const adata, const u8 *key_in, u32 keylen,
49 struct split_key_result result;
51 unsigned int local_max;
54 adata->keylen = split_key_len(adata->algtype & OP_ALG_ALGSEL_MASK);
55 adata->keylen_pad = split_key_pad_len(adata->algtype &
57 local_max = max(keylen, adata->keylen_pad);
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);
64 if (local_max > max_keylen)
67 desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
69 dev_err(jrdev, "unable to allocate key input memory\n");
73 memcpy(key_out, key_in, keylen);
75 dma_addr = dma_map_single(jrdev, key_out, local_max, DMA_BIDIRECTIONAL);
76 if (dma_mapping_error(jrdev, dma_addr)) {
77 dev_err(jrdev, "unable to map key memory\n");
81 init_job_desc(desc, 0);
82 append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
84 /* Sets MDHA up into an HMAC-INIT */
85 append_operation(desc, (adata->algtype & OP_ALG_ALGSEL_MASK) |
86 OP_ALG_AAI_HMAC | OP_TYPE_CLASS2_ALG | OP_ALG_DECRYPT |
90 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
91 * into both pads inside MDHA
93 append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
94 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
97 * FIFO_STORE with the explicit split-key content store
100 append_fifo_store(desc, dma_addr, adata->keylen,
101 LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
103 print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ",
104 DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc),
108 init_completion(&result.completion);
110 ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
111 if (ret == -EINPROGRESS) {
113 wait_for_completion(&result.completion);
116 print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ",
117 DUMP_PREFIX_ADDRESS, 16, 4, key_out,
118 adata->keylen_pad, 1);
121 dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL);
126 EXPORT_SYMBOL(gen_split_key);