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 22 if (err) { 23 char tmp[CAAM_ERROR_STR_MAX]; 24 25 dev_err(dev, "%08x: %s\n", err, caam_jr_strstatus(tmp, err)); 26 } 27 28 res->err = err; 29 30 complete(&res->completion); 31 } 32 EXPORT_SYMBOL(split_key_done); 33 /* 34 get a split ipad/opad key 35 36 Split key generation----------------------------------------------- 37 38 [00] 0xb0810008 jobdesc: stidx=1 share=never len=8 39 [01] 0x04000014 key: class2->keyreg len=20 40 @0xffe01000 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 45 @0xffe04000 46 */ 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, 49 u32 alg_op) 50 { 51 u32 *desc; 52 struct split_key_result result; 53 dma_addr_t dma_addr_in, dma_addr_out; 54 int ret = 0; 55 56 desc = kmalloc(CAAM_CMD_SZ * 6 + CAAM_PTR_SZ * 2, GFP_KERNEL | GFP_DMA); 57 58 init_job_desc(desc, 0); 59 60 dma_addr_in = dma_map_single(jrdev, (void *)key_in, keylen, 61 DMA_TO_DEVICE); 62 if (dma_mapping_error(jrdev, dma_addr_in)) { 63 dev_err(jrdev, "unable to map key input memory\n"); 64 kfree(desc); 65 return -ENOMEM; 66 } 67 append_key(desc, dma_addr_in, keylen, CLASS_2 | KEY_DEST_CLASS_REG); 68 69 /* Sets MDHA up into an HMAC-INIT */ 70 append_operation(desc, alg_op | OP_ALG_DECRYPT | OP_ALG_AS_INIT); 71 72 /* 73 * do a FIFO_LOAD of zero, this will trigger the internal key expansion 74 * into both pads inside MDHA 75 */ 76 append_fifo_load_as_imm(desc, NULL, 0, LDST_CLASS_2_CCB | 77 FIFOLD_TYPE_MSG | FIFOLD_TYPE_LAST2); 78 79 /* 80 * FIFO_STORE with the explicit split-key content store 81 * (0x26 output type) 82 */ 83 dma_addr_out = dma_map_single(jrdev, key_out, split_key_pad_len, 84 DMA_FROM_DEVICE); 85 if (dma_mapping_error(jrdev, dma_addr_out)) { 86 dev_err(jrdev, "unable to map key output memory\n"); 87 kfree(desc); 88 return -ENOMEM; 89 } 90 append_fifo_store(desc, dma_addr_out, split_key_len, 91 LDST_CLASS_2_CCB | FIFOST_TYPE_SPLIT_KEK); 92 93 #ifdef DEBUG 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); 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 109 print_hex_dump(KERN_ERR, "ctx.key@"xstr(__LINE__)": ", 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); 117 dma_unmap_single(jrdev, dma_addr_in, keylen, DMA_TO_DEVICE); 118 119 kfree(desc); 120 121 return ret; 122 } 123