target/linux/apm821xx/patches-4.14/020-0024-crypto-crypto4xx-add-aes-ccm-support.patch

   1 From 65ea8b678fcf385ac18864743bae66c0643e6842 Mon Sep 17 00:00:00 2001
   2 From: Christian Lamparter <chunkeey@gmail.com>
   3 Date: Wed, 4 Oct 2017 01:00:16 +0200
   4 Subject: [PATCH 24/25] crypto: crypto4xx - add aes-ccm support
   5
   6 This patch adds aes-ccm support.
   7
   8 Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
   9 Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
  10 ---
  11  drivers/crypto/amcc/crypto4xx_alg.c  | 185 +++++++++++++++++++++++++++++++++++
  12  drivers/crypto/amcc/crypto4xx_core.c |  23 +++++
  13  drivers/crypto/amcc/crypto4xx_core.h |   8 ++
  14  3 files changed, 216 insertions(+)
  15
  16 --- a/drivers/crypto/amcc/crypto4xx_alg.c
  17 +++ b/drivers/crypto/amcc/crypto4xx_alg.c
  18 @@ -232,6 +232,191 @@ int crypto4xx_rfc3686_decrypt(struct abl
  19                                   ctx->sa_out, ctx->sa_len, 0);
  20  }
  21
  22 +static inline bool crypto4xx_aead_need_fallback(struct aead_request *req,
  23 +                                               bool is_ccm, bool decrypt)
  24 +{
  25 +       struct crypto_aead *aead = crypto_aead_reqtfm(req);
  26 +
  27 +       /* authsize has to be a multiple of 4 */
  28 +       if (aead->authsize & 3)
  29 +               return true;
  30 +
  31 +       /*
  32 +        * hardware does not handle cases where cryptlen
  33 +        * is less than a block
  34 +        */
  35 +       if (req->cryptlen < AES_BLOCK_SIZE)
  36 +               return true;
  37 +
  38 +       /* assoc len needs to be a multiple of 4 */
  39 +       if (req->assoclen & 0x3)
  40 +               return true;
  41 +
  42 +       /* CCM supports only counter field length of 2 and 4 bytes */
  43 +       if (is_ccm && !(req->iv[0] == 1 || req->iv[0] == 3))
  44 +               return true;
  45 +
  46 +       /* CCM - fix CBC MAC mismatch in special case */
  47 +       if (is_ccm && decrypt && !req->assoclen)
  48 +               return true;
  49 +
  50 +       return false;
  51 +}
  52 +
  53 +static int crypto4xx_aead_fallback(struct aead_request *req,
  54 +       struct crypto4xx_ctx *ctx, bool do_decrypt)
  55 +{
  56 +       char aead_req_data[sizeof(struct aead_request) +
  57 +                          crypto_aead_reqsize(ctx->sw_cipher.aead)]
  58 +               __aligned(__alignof__(struct aead_request));
  59 +
  60 +       struct aead_request *subreq = (void *) aead_req_data;
  61 +
  62 +       memset(subreq, 0, sizeof(aead_req_data));
  63 +
  64 +       aead_request_set_tfm(subreq, ctx->sw_cipher.aead);
  65 +       aead_request_set_callback(subreq, req->base.flags,
  66 +                                 req->base.complete, req->base.data);
  67 +       aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen,
  68 +                              req->iv);
  69 +       aead_request_set_ad(subreq, req->assoclen);
  70 +       return do_decrypt ? crypto_aead_decrypt(subreq) :
  71 +                           crypto_aead_encrypt(subreq);
  72 +}
  73 +
  74 +static int crypto4xx_setup_fallback(struct crypto4xx_ctx *ctx,
  75 +                                   struct crypto_aead *cipher,
  76 +                                   const u8 *key,
  77 +                                   unsigned int keylen)
  78 +{
  79 +       int rc;
  80 +
  81 +       crypto_aead_clear_flags(ctx->sw_cipher.aead, CRYPTO_TFM_REQ_MASK);
  82 +       crypto_aead_set_flags(ctx->sw_cipher.aead,
  83 +               crypto_aead_get_flags(cipher) & CRYPTO_TFM_REQ_MASK);
  84 +       rc = crypto_aead_setkey(ctx->sw_cipher.aead, key, keylen);
  85 +       crypto_aead_clear_flags(cipher, CRYPTO_TFM_RES_MASK);
  86 +       crypto_aead_set_flags(cipher,
  87 +               crypto_aead_get_flags(ctx->sw_cipher.aead) &
  88 +                       CRYPTO_TFM_RES_MASK);
  89 +
  90 +       return rc;
  91 +}
  92 +
  93 +/**
  94 + * AES-CCM Functions
  95 + */
  96 +
  97 +int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher, const u8 *key,
  98 +                            unsigned int keylen)
  99 +{
 100 +       struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 101 +       struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 102 +       struct dynamic_sa_ctl *sa;
 103 +       int rc = 0;
 104 +
 105 +       rc = crypto4xx_setup_fallback(ctx, cipher, key, keylen);
 106 +       if (rc)
 107 +               return rc;
 108 +
 109 +       if (ctx->sa_in || ctx->sa_out)
 110 +               crypto4xx_free_sa(ctx);
 111 +
 112 +       rc = crypto4xx_alloc_sa(ctx, SA_AES128_CCM_LEN + (keylen - 16) / 4);
 113 +       if (rc)
 114 +               return rc;
 115 +
 116 +       /* Setup SA */
 117 +       sa = (struct dynamic_sa_ctl *) ctx->sa_in;
 118 +       sa->sa_contents.w = SA_AES_CCM_CONTENTS | (keylen << 2);
 119 +
 120 +       set_dynamic_sa_command_0(sa, SA_NOT_SAVE_HASH, SA_NOT_SAVE_IV,
 121 +                                SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 122 +                                SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 123 +                                SA_CIPHER_ALG_AES,
 124 +                                SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 125 +                                SA_OPCODE_HASH_DECRYPT, DIR_INBOUND);
 126 +
 127 +       set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 128 +                                CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 129 +                                SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 130 +                                SA_NOT_COPY_PAD, SA_COPY_PAYLOAD,
 131 +                                SA_NOT_COPY_HDR);
 132 +
 133 +       sa->sa_command_1.bf.key_len = keylen >> 3;
 134 +
 135 +       crypto4xx_memcpy_to_le32(get_dynamic_sa_key_field(sa), key, keylen);
 136 +
 137 +       memcpy(ctx->sa_out, ctx->sa_in, ctx->sa_len * 4);
 138 +       sa = (struct dynamic_sa_ctl *) ctx->sa_out;
 139 +
 140 +       set_dynamic_sa_command_0(sa, SA_SAVE_HASH, SA_NOT_SAVE_IV,
 141 +                                SA_LOAD_HASH_FROM_SA, SA_LOAD_IV_FROM_STATE,
 142 +                                SA_NO_HEADER_PROC, SA_HASH_ALG_CBC_MAC,
 143 +                                SA_CIPHER_ALG_AES,
 144 +                                SA_PAD_TYPE_ZERO, SA_OP_GROUP_BASIC,
 145 +                                SA_OPCODE_ENCRYPT_HASH, DIR_OUTBOUND);
 146 +
 147 +       set_dynamic_sa_command_1(sa, CRYPTO_MODE_CTR, SA_HASH_MODE_HASH,
 148 +                                CRYPTO_FEEDBACK_MODE_NO_FB, SA_EXTENDED_SN_OFF,
 149 +                                SA_SEQ_MASK_OFF, SA_MC_ENABLE,
 150 +                                SA_COPY_PAD, SA_COPY_PAYLOAD,
 151 +                                SA_NOT_COPY_HDR);
 152 +
 153 +       sa->sa_command_1.bf.key_len = keylen >> 3;
 154 +       return 0;
 155 +}
 156 +
 157 +static int crypto4xx_crypt_aes_ccm(struct aead_request *req, bool decrypt)
 158 +{
 159 +       struct crypto4xx_ctx *ctx  = crypto_tfm_ctx(req->base.tfm);
 160 +       struct crypto_aead *aead = crypto_aead_reqtfm(req);
 161 +       unsigned int len = req->cryptlen;
 162 +       __le32 iv[16];
 163 +       u32 tmp_sa[ctx->sa_len * 4];
 164 +       struct dynamic_sa_ctl *sa = (struct dynamic_sa_ctl *)tmp_sa;
 165 +
 166 +       if (crypto4xx_aead_need_fallback(req, true, decrypt))
 167 +               return crypto4xx_aead_fallback(req, ctx, decrypt);
 168 +
 169 +       if (decrypt)
 170 +               len -= crypto_aead_authsize(aead);
 171 +
 172 +       memcpy(tmp_sa, decrypt ? ctx->sa_in : ctx->sa_out, sizeof(tmp_sa));
 173 +       sa->sa_command_0.bf.digest_len = crypto_aead_authsize(aead) >> 2;
 174 +
 175 +       if (req->iv[0] == 1) {
 176 +               /* CRYPTO_MODE_AES_ICM */
 177 +               sa->sa_command_1.bf.crypto_mode9_8 = 1;
 178 +       }
 179 +
 180 +       iv[3] = cpu_to_le32(0);
 181 +       crypto4xx_memcpy_to_le32(iv, req->iv, 16 - (req->iv[0] + 1));
 182 +
 183 +       return crypto4xx_build_pd(&req->base, ctx, req->src, req->dst,
 184 +                                 len, iv, sizeof(iv),
 185 +                                 sa, ctx->sa_len, req->assoclen);
 186 +}
 187 +
 188 +int crypto4xx_encrypt_aes_ccm(struct aead_request *req)
 189 +{
 190 +       return crypto4xx_crypt_aes_ccm(req, false);
 191 +}
 192 +
 193 +int crypto4xx_decrypt_aes_ccm(struct aead_request *req)
 194 +{
 195 +       return crypto4xx_crypt_aes_ccm(req, true);
 196 +}
 197 +
 198 +int crypto4xx_setauthsize_aead(struct crypto_aead *cipher,
 199 +                              unsigned int authsize)
 200 +{
 201 +       struct crypto_tfm *tfm = crypto_aead_tfm(cipher);
 202 +       struct crypto4xx_ctx *ctx = crypto_tfm_ctx(tfm);
 203 +
 204 +       return crypto_aead_setauthsize(ctx->sw_cipher.aead, authsize);
 205 +}
 206 +
 207  /**
 208   * HASH SHA1 Functions
 209   */
 210 --- a/drivers/crypto/amcc/crypto4xx_core.c
 211 +++ b/drivers/crypto/amcc/crypto4xx_core.c
 212 @@ -1219,6 +1219,29 @@ static struct crypto4xx_alg_common crypt
 213                         }
 214                 }
 215         } },
 216 +
 217 +       /* AEAD */
 218 +       { .type = CRYPTO_ALG_TYPE_AEAD, .u.aead = {
 219 +               .setkey         = crypto4xx_setkey_aes_ccm,
 220 +               .setauthsize    = crypto4xx_setauthsize_aead,
 221 +               .encrypt        = crypto4xx_encrypt_aes_ccm,
 222 +               .decrypt        = crypto4xx_decrypt_aes_ccm,
 223 +               .init           = crypto4xx_aead_init,
 224 +               .exit           = crypto4xx_aead_exit,
 225 +               .ivsize         = AES_BLOCK_SIZE,
 226 +               .maxauthsize    = 16,
 227 +               .base = {
 228 +                       .cra_name       = "ccm(aes)",
 229 +                       .cra_driver_name = "ccm-aes-ppc4xx",
 230 +                       .cra_priority   = CRYPTO4XX_CRYPTO_PRIORITY,
 231 +                       .cra_flags      = CRYPTO_ALG_ASYNC |
 232 +                                         CRYPTO_ALG_NEED_FALLBACK |
 233 +                                         CRYPTO_ALG_KERN_DRIVER_ONLY,
 234 +                       .cra_blocksize  = 1,
 235 +                       .cra_ctxsize    = sizeof(struct crypto4xx_ctx),
 236 +                       .cra_module     = THIS_MODULE,
 237 +               },
 238 +       } },
 239  };
 240
 241  /**
 242 --- a/drivers/crypto/amcc/crypto4xx_core.h
 243 +++ b/drivers/crypto/amcc/crypto4xx_core.h
 244 @@ -222,4 +222,12 @@ static inline void crypto4xx_memcpy_to_l
 245  {
 246         crypto4xx_memcpy_swab32((u32 *)dst, buf, len);
 247  }
 248 +
 249 +int crypto4xx_setauthsize_aead(struct crypto_aead *ciper,
 250 +                              unsigned int authsize);
 251 +int crypto4xx_setkey_aes_ccm(struct crypto_aead *cipher,
 252 +                            const u8 *key, unsigned int keylen);
 253 +int crypto4xx_encrypt_aes_ccm(struct aead_request *req);
 254 +int crypto4xx_decrypt_aes_ccm(struct aead_request *req);
 255 +
 256  #endif