2 * CAAM/SEC 4.x functions for handling key-generation jobs
4 * Copyright 2008-2011 Freescale Semiconductor, Inc.
10 #include "desc_constr.h"
13 void split_key_done(struct device *dev, u32 *desc, u32 err,
16 struct split_key_result *res = context;
19 dev_err(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err);
23 char tmp[CAAM_ERROR_STR_MAX];
25 dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err));
30 complete(&res->completion);
32 EXPORT_SYMBOL(split_key_done);
34 get a split ipad/opad key
36 Split key generation-----------------------------------------------
38 [00] 0xb0810008 jobdesc: stidx=1 share=never len=8
39 [01] 0x04000014 key: class2->keyreg len=20
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
47 u32 gen_split_key(struct device *jrdev, u8 *key_out, int split_key_len,
48 int split_key_pad_len, const u8 *key_in, u32 keylen,
52 struct split_key_result result;
53 dma_addr_t dma_addr_in, dma_addr_out;
56 desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA);
58 init_job_desc(desc, 0);
60 dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen,
62 if (dma_mapping_error(jrdev, dma_addr_in)) {
63 dev_err(jrdev, "unable to map key input memory\n");
67 append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG);
69 /* Sets MDHA up into an HMAC-INIT */
70 append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT);
73 * do a FIFO_LOAD of zero, this will trigger the internal key expansion
74 * into both pads inside MDHA
76 append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB |
77 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2);
80 * FIFO_STORE with the explicit split-key content store
83 dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len,
85 if (dma_mapping_error(jrdev, dma_addr_out)) {
86 dev_err(jrdev, "unable to map key output memory\n");
90 append_fifo_store(desc, dma_addr_out, split_key_len,
91 LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK);
94 print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
95 DUMP_PREFIX_ADDRESS, 16, 4, key_in, keylen, 1);
96 print_hex_dump(KERN_ERR, "jobdesc@"xstr(__LINE__)": ",
97 DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 1);
101 init_completion(&result.completion);
103 ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result);
106 wait_for_completion_interruptible(&result.completion);
109 print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ",
110 DUMP_PREFIX_ADDRESS, 16, 4, key_out,
111 split_key_pad_len, 1);
115 dma_unmap_single(jrdev, dma_addr_out, split_key_pad_len,
117 dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE);