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 int ecode = 0; 19 20 dev_dbg(dev, "%s %d: err 0x%x\n", __func__, __LINE__, err); 21 22 if (err) 23 ecode = caam_jr_strstatus(dev, err); 24 25 res->err = ecode; 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 */ 44 int gen_split_key(struct device *jrdev, u8 *key_out, 45 struct alginfo * const adata, const u8 *key_in, u32 keylen, 46 int max_keylen) 47 { 48 u32 *desc; 49 struct split_key_result result; 50 dma_addr_t dma_addr; 51 unsigned int local_max; 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 local_max = max(keylen, adata->keylen_pad); 58 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); 63 64 if (local_max > max_keylen) 65 return -EINVAL; 66 67 desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA); 68 if (!desc) { 69 dev_err(jrdev, "unable to allocate key input memory\n"); 70 return ret; 71 } 72 73 memcpy(key_out, key_in, keylen); 74 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"); 78 goto out_free; 79 } 80 81 init_job_desc(desc, 0); 82 append_key(desc, dma_addr, keylen, CLASS_2 | KEY_DEST_CLASS_REG); 83 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 | 87 OP_ALG_AS_INIT); 88 89 /* 90 * do a FIFO_LOAD of zero, this will trigger the internal key expansion 91 * into both pads inside MDHA 92 */ 93 append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB | 94 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2); 95 96 /* 97 * FIFO_STORE with the explicit split-key content store 98 * (0x26 output type) 99 */ 100 append_fifo_store(desc, dma_addr, adata->keylen, 101 LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); 102 103 print_hex_dump_debug("jobdesc@"__stringify(__LINE__)": ", 104 DUMP_PREFIX_ADDRESS, 16, 4, desc, desc_bytes(desc), 105 1); 106 107 result.err = 0; 108 init_completion(&result.completion); 109 110 ret = caam_jr_enqueue(jrdev, desc, split_key_done, &result); 111 if (ret == -EINPROGRESS) { 112 /* in progress */ 113 wait_for_completion(&result.completion); 114 ret = result.err; 115 116 print_hex_dump_debug("ctx.key@"__stringify(__LINE__)": ", 117 DUMP_PREFIX_ADDRESS, 16, 4, key_out, 118 adata->keylen_pad, 1); 119 } 120 121 dma_unmap_single(jrdev, dma_addr, local_max, DMA_BIDIRECTIONAL); 122 out_free: 123 kfree(desc); 124 return ret; 125 } 126 EXPORT_SYMBOL(gen_split_key); 127