root/drivers/crypto/ccree/cc_aead.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Copyright (C) 2012-2019 ARM Limited (or its affiliates). */
   3 
   4 /* \file cc_aead.h
   5  * ARM CryptoCell AEAD Crypto API
   6  */
   7 
   8 #ifndef __CC_AEAD_H__
   9 #define __CC_AEAD_H__
  10 
  11 #include <linux/kernel.h>
  12 #include <crypto/algapi.h>
  13 #include <crypto/ctr.h>
  14 
  15 /* mac_cmp - HW writes 8 B but all bytes hold the same value */
  16 #define ICV_CMP_SIZE 8
  17 #define CCM_CONFIG_BUF_SIZE (AES_BLOCK_SIZE * 3)
  18 #define MAX_MAC_SIZE SHA256_DIGEST_SIZE
  19 
  20 /* defines for AES GCM configuration buffer */
  21 #define GCM_BLOCK_LEN_SIZE 8
  22 
  23 #define GCM_BLOCK_RFC4_IV_OFFSET        4
  24 #define GCM_BLOCK_RFC4_IV_SIZE          8  /* IV size for rfc's */
  25 #define GCM_BLOCK_RFC4_NONCE_OFFSET     0
  26 #define GCM_BLOCK_RFC4_NONCE_SIZE       4
  27 
  28 /* Offsets into AES CCM configuration buffer */
  29 #define CCM_B0_OFFSET 0
  30 #define CCM_A0_OFFSET 16
  31 #define CCM_CTR_COUNT_0_OFFSET 32
  32 /* CCM B0 and CTR_COUNT constants. */
  33 #define CCM_BLOCK_NONCE_OFFSET 1  /* Nonce offset inside B0 and CTR_COUNT */
  34 #define CCM_BLOCK_NONCE_SIZE   3  /* Nonce size inside B0 and CTR_COUNT */
  35 #define CCM_BLOCK_IV_OFFSET    4  /* IV offset inside B0 and CTR_COUNT */
  36 #define CCM_BLOCK_IV_SIZE      8  /* IV size inside B0 and CTR_COUNT */
  37 
  38 enum aead_ccm_header_size {
  39         ccm_header_size_null = -1,
  40         ccm_header_size_zero = 0,
  41         ccm_header_size_2 = 2,
  42         ccm_header_size_6 = 6,
  43         ccm_header_size_max = S32_MAX
  44 };
  45 
  46 struct aead_req_ctx {
  47         /* Allocate cache line although only 4 bytes are needed to
  48          *  assure next field falls @ cache line
  49          *  Used for both: digest HW compare and CCM/GCM MAC value
  50          */
  51         u8 mac_buf[MAX_MAC_SIZE] ____cacheline_aligned;
  52         u8 ctr_iv[AES_BLOCK_SIZE] ____cacheline_aligned;
  53 
  54         //used in gcm
  55         u8 gcm_iv_inc1[AES_BLOCK_SIZE] ____cacheline_aligned;
  56         u8 gcm_iv_inc2[AES_BLOCK_SIZE] ____cacheline_aligned;
  57         u8 hkey[AES_BLOCK_SIZE] ____cacheline_aligned;
  58         struct {
  59                 u8 len_a[GCM_BLOCK_LEN_SIZE] ____cacheline_aligned;
  60                 u8 len_c[GCM_BLOCK_LEN_SIZE];
  61         } gcm_len_block;
  62 
  63         u8 ccm_config[CCM_CONFIG_BUF_SIZE] ____cacheline_aligned;
  64         /* HW actual size input */
  65         unsigned int hw_iv_size ____cacheline_aligned;
  66         /* used to prevent cache coherence problem */
  67         u8 backup_mac[MAX_MAC_SIZE];
  68         u8 *backup_iv; /* store orig iv */
  69         u32 assoclen; /* internal assoclen */
  70         dma_addr_t mac_buf_dma_addr; /* internal ICV DMA buffer */
  71         /* buffer for internal ccm configurations */
  72         dma_addr_t ccm_iv0_dma_addr;
  73         dma_addr_t icv_dma_addr; /* Phys. address of ICV */
  74 
  75         //used in gcm
  76         /* buffer for internal gcm configurations */
  77         dma_addr_t gcm_iv_inc1_dma_addr;
  78         /* buffer for internal gcm configurations */
  79         dma_addr_t gcm_iv_inc2_dma_addr;
  80         dma_addr_t hkey_dma_addr; /* Phys. address of hkey */
  81         dma_addr_t gcm_block_len_dma_addr; /* Phys. address of gcm block len */
  82         bool is_gcm4543;
  83 
  84         u8 *icv_virt_addr; /* Virt. address of ICV */
  85         struct async_gen_req_ctx gen_ctx;
  86         struct cc_mlli assoc;
  87         struct cc_mlli src;
  88         struct cc_mlli dst;
  89         struct scatterlist *src_sgl;
  90         struct scatterlist *dst_sgl;
  91         unsigned int src_offset;
  92         unsigned int dst_offset;
  93         enum cc_req_dma_buf_type assoc_buff_type;
  94         enum cc_req_dma_buf_type data_buff_type;
  95         struct mlli_params mlli_params;
  96         unsigned int cryptlen;
  97         struct scatterlist ccm_adata_sg;
  98         enum aead_ccm_header_size ccm_hdr_size;
  99         unsigned int req_authsize;
 100         enum drv_cipher_mode cipher_mode;
 101         bool is_icv_fragmented;
 102         bool is_single_pass;
 103         bool plaintext_authenticate_only; //for gcm_rfc4543
 104 };
 105 
 106 int cc_aead_alloc(struct cc_drvdata *drvdata);
 107 int cc_aead_free(struct cc_drvdata *drvdata);
 108 
 109 #endif /*__CC_AEAD_H__*/