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1// SPDX-License-Identifier: GPL-2.02/*3 * CAAM/SEC 4.x functions for handling key-generation jobs4 *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 14void 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}29EXPORT_SYMBOL(split_key_done);30/*31get a split ipad/opad key32 33Split key generation-----------------------------------------------34 35[00] 0xb0810008 jobdesc: stidx=1 share=never len=836[01] 0x04000014 key: class2->keyreg len=2037 @0xffe0100038[03] 0x84410014 operation: cls2-op sha1 hmac init dec39[04] 0x24940000 fifold: class2 msgdata-last2 len=0 imm40[05] 0xa4000001 jump: class2 local all ->1 [06]41[06] 0x64260028 fifostr: class2 mdsplit-jdk len=4042 @0xffe0400043*/44int 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);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 expansion91 * into both pads inside MDHA92 */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 store98 * (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);122out_free:123 kfree(desc);124 return ret;125}126EXPORT_SYMBOL(gen_split_key);127