LXR linux/drivers/crypto/caam/key

   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
  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 key
  32
  33Split 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*/
  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 | 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);
 122out_free:
 123        kfree(desc);
 124        return ret;
 125}
 126EXPORT_SYMBOL(gen_split_key);
 127