drivers/crypto/caam/caamhash_desc.c

   1 // SPDX-License-Identifier: (GPL-2.0+ OR BSD-3-Clause)
   2 /*
   3  * Shared descriptors for ahash algorithms
   4  *
   5  * Copyright 2017-2019 NXP
   6  */
   7
   8 #include "compat.h"
   9 #include "desc_constr.h"
  10 #include "caamhash_desc.h"
  11
  12 /**
  13  * cnstr_shdsc_ahash - ahash shared descriptor
  14  * @desc: pointer to buffer used for descriptor construction
  15  * @adata: pointer to authentication transform definitions.
  16  *         A split key is required for SEC Era < 6; the size of the split key
  17  *         is specified in this case.
  18  *         Valid algorithm values - one of OP_ALG_ALGSEL_{MD5, SHA1, SHA224,
  19  *         SHA256, SHA384, SHA512}.
  20  * @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
  21  * @digestsize: algorithm's digest size
  22  * @ctx_len: size of Context Register
  23  * @import_ctx: true if previous Context Register needs to be restored
  24  *              must be true for ahash update and final
  25  *              must be false for for ahash first and digest
  26  * @era: SEC Era
  27  */
  28 void cnstr_shdsc_ahash(u32 * const desc, struct alginfo *adata, u32 state,
  29                        int digestsize, int ctx_len, bool import_ctx, int era)
  30 {
  31         u32 op = adata->algtype;
  32
  33         init_sh_desc(desc, HDR_SHARE_SERIAL);
  34
  35         /* Append key if it has been set; ahash update excluded */
  36         if (state != OP_ALG_AS_UPDATE && adata->keylen) {
  37                 u32 *skip_key_load;
  38
  39                 /* Skip key loading if already shared */
  40                 skip_key_load = append_jump(desc, JUMP_JSL | JUMP_TEST_ALL |
  41                                             JUMP_COND_SHRD);
  42
  43                 if (era < 6)
  44                         append_key_as_imm(desc, adata->key_virt,
  45                                           adata->keylen_pad,
  46                                           adata->keylen, CLASS_2 |
  47                                           KEY_DEST_MDHA_SPLIT | KEY_ENC);
  48                 else
  49                         append_proto_dkp(desc, adata);
  50
  51                 set_jump_tgt_here(desc, skip_key_load);
  52
  53                 op |= OP_ALG_AAI_HMAC_PRECOMP;
  54         }
  55
  56         /* If needed, import context from software */
  57         if (import_ctx)
  58                 append_seq_load(desc, ctx_len, LDST_CLASS_2_CCB |
  59                                 LDST_SRCDST_BYTE_CONTEXT);
  60
  61         /* Class 2 operation */
  62         append_operation(desc, op | state | OP_ALG_ENCRYPT);
  63
  64         /*
  65          * Load from buf and/or src and write to req->result or state->context
  66          * Calculate remaining bytes to read
  67          */
  68         append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
  69         /* Read remaining bytes */
  70         append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS2 | FIFOLD_TYPE_LAST2 |
  71                              FIFOLD_TYPE_MSG | KEY_VLF);
  72         /* Store class2 context bytes */
  73         append_seq_store(desc, digestsize, LDST_CLASS_2_CCB |
  74                          LDST_SRCDST_BYTE_CONTEXT);
  75 }
  76 EXPORT_SYMBOL(cnstr_shdsc_ahash);
  77
  78 /**
  79  * cnstr_shdsc_sk_hash - shared descriptor for symmetric key cipher-based
  80  *                       hash algorithms
  81  * @desc: pointer to buffer used for descriptor construction
  82  * @adata: pointer to authentication transform definitions.
  83  * @state: algorithm state OP_ALG_AS_{INIT, FINALIZE, INITFINALIZE, UPDATE}
  84  * @digestsize: algorithm's digest size
  85  * @ctx_len: size of Context Register
  86  */
  87 void cnstr_shdsc_sk_hash(u32 * const desc, struct alginfo *adata, u32 state,
  88                          int digestsize, int ctx_len)
  89 {
  90         u32 *skip_key_load;
  91
  92         init_sh_desc(desc, HDR_SHARE_SERIAL | HDR_SAVECTX);
  93
  94         /* Skip loading of key, context if already shared */
  95         skip_key_load = append_jump(desc, JUMP_TEST_ALL | JUMP_COND_SHRD);
  96
  97         if (state == OP_ALG_AS_INIT || state == OP_ALG_AS_INITFINAL) {
  98                 append_key_as_imm(desc, adata->key_virt, adata->keylen,
  99                                   adata->keylen, CLASS_1 | KEY_DEST_CLASS_REG);
 100         } else { /* UPDATE, FINALIZE */
 101                 if (is_xcbc_aes(adata->algtype))
 102                         /* Load K1 */
 103                         append_key(desc, adata->key_dma, adata->keylen,
 104                                    CLASS_1 | KEY_DEST_CLASS_REG | KEY_ENC);
 105                 else /* CMAC */
 106                         append_key_as_imm(desc, adata->key_virt, adata->keylen,
 107                                           adata->keylen, CLASS_1 |
 108                                           KEY_DEST_CLASS_REG);
 109                 /* Restore context */
 110                 append_seq_load(desc, ctx_len, LDST_CLASS_1_CCB |
 111                                 LDST_SRCDST_BYTE_CONTEXT);
 112         }
 113
 114         set_jump_tgt_here(desc, skip_key_load);
 115
 116         /* Class 1 operation */
 117         append_operation(desc, adata->algtype | state | OP_ALG_ENCRYPT);
 118
 119         /*
 120          * Load from buf and/or src and write to req->result or state->context
 121          * Calculate remaining bytes to read
 122          */
 123         append_math_add(desc, VARSEQINLEN, SEQINLEN, REG0, CAAM_CMD_SZ);
 124
 125         /* Read remaining bytes */
 126         append_seq_fifo_load(desc, 0, FIFOLD_CLASS_CLASS1 | FIFOLD_TYPE_LAST1 |
 127                              FIFOLD_TYPE_MSG | FIFOLDST_VLF);
 128
 129         /*
 130          * Save context:
 131          * - xcbc: partial hash, keys K2 and K3
 132          * - cmac: partial hash, constant L = E(K,0)
 133          */
 134         append_seq_store(desc, digestsize, LDST_CLASS_1_CCB |
 135                          LDST_SRCDST_BYTE_CONTEXT);
 136         if (is_xcbc_aes(adata->algtype) && state == OP_ALG_AS_INIT)
 137                 /* Save K1 */
 138                 append_fifo_store(desc, adata->key_dma, adata->keylen,
 139                                   LDST_CLASS_1_CCB | FIFOST_TYPE_KEY_KEK);
 140 }
 141 EXPORT_SYMBOL(cnstr_shdsc_sk_hash);
 142
 143 MODULE_LICENSE("Dual BSD/GPL");
 144 MODULE_DESCRIPTION("FSL CAAM ahash descriptors support");
 145 MODULE_AUTHOR("NXP Semiconductors");