code.ossystems Code Review - meta-freescale.git/blob

   1 From 11b55103463bac614e00d74e9f196ec4ec6bade1 Mon Sep 17 00:00:00 2001
   2 From: Cristian Stoica <cristian.stoica@freescale.com>
   3 Date: Mon, 16 Jun 2014 14:06:21 +0300
   4 Subject: [PATCH 17/17] cryptodev: add support for aes-gcm algorithm offloading
   5
   6 Change-Id: I3b77dc5ef8b8f707309549244a02852d95b36168
   7 Signed-off-by: Cristian Stoica <cristian.stoica@freescale.com>
   8 Reviewed-on: http://git.am.freescale.net:8181/17226
   9 ---
  10  apps/speed.c                  |   6 +-
  11  crypto/engine/eng_cryptodev.c | 229 +++++++++++++++++++++++++++++++++++++++++-
  12  2 files changed, 233 insertions(+), 2 deletions(-)
  13
  14 diff --git a/apps/speed.c b/apps/speed.c
  15 index 9886ca3..099dede 100644
  16 --- a/apps/speed.c
  17 +++ b/apps/speed.c
  18 @@ -224,7 +224,11 @@
  19  #endif
  20
  21  #undef BUFSIZE
  22 -#define BUFSIZE        ((long)1024*8+1)
  23 +/* The buffer overhead allows GCM tag at the end of the encrypted data. This
  24 +   avoids buffer overflows from cryptodev since Linux kernel GCM
  25 +   implementation allways adds the tag - unlike e_aes.c:aes_gcm_cipher()
  26 +   which doesn't */
  27 +#define BUFSIZE        ((long)1024*8 + EVP_GCM_TLS_TAG_LEN)
  28  int run=0;
  29
  30  static int mr=0;
  31 diff --git a/crypto/engine/eng_cryptodev.c b/crypto/engine/eng_cryptodev.c
  32 index 13d924f..4493490 100644
  33 --- a/crypto/engine/eng_cryptodev.c
  34 +++ b/crypto/engine/eng_cryptodev.c
  35 @@ -78,8 +78,10 @@ struct dev_crypto_state {
  36         struct session_op d_sess;
  37         int d_fd;
  38         unsigned char *aad;
  39 -       unsigned int aad_len;
  40 +       int aad_len;
  41         unsigned int len;
  42 +       unsigned char *iv;
  43 +       int ivlen;
  44
  45  #ifdef USE_CRYPTODEV_DIGESTS
  46         char dummy_mac_key[HASH_MAX_LEN];
  47 @@ -251,6 +253,7 @@ static struct {
  48         { CRYPTO_SKIPJACK_CBC,  NID_undef,        0,  0,  0},
  49         { CRYPTO_TLS10_AES_CBC_HMAC_SHA1, NID_aes_128_cbc_hmac_sha1, 16, 16, 20},
  50         { CRYPTO_TLS10_AES_CBC_HMAC_SHA1, NID_aes_256_cbc_hmac_sha1, 16, 32, 20},
  51 +       { CRYPTO_AES_GCM,       NID_aes_128_gcm,  16, 16, 0},
  52         { 0, NID_undef, 0, 0, 0},
  53  };
  54
  55 @@ -271,6 +274,19 @@ static struct {
  56  };
  57  #endif
  58
  59 +/* increment counter (64-bit int) by 1 */
  60 +static void ctr64_inc(unsigned char *counter) {
  61 +       int n=8;
  62 +       unsigned char  c;
  63 +
  64 +       do {
  65 +               --n;
  66 +               c = counter[n];
  67 +               ++c;
  68 +               counter[n] = c;
  69 +               if (c) return;
  70 +       } while (n);
  71 +}
  72  /*
  73   * Return a fd if /dev/crypto seems usable, 0 otherwise.
  74   */
  75 @@ -762,6 +778,197 @@ static int cryptodev_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
  76         }
  77  }
  78
  79 +static int cryptodev_init_gcm_key(EVP_CIPHER_CTX *ctx,
  80 +       const unsigned char *key, const unsigned char *iv, int enc)
  81 +{
  82 +       struct dev_crypto_state *state = ctx->cipher_data;
  83 +       struct session_op *sess = &state->d_sess;
  84 +       int cipher = -1, i;
  85 +       if (!iv && !key)
  86 +               return 1;
  87 +
  88 +       if (iv)
  89 +               memcpy(ctx->iv, iv, ctx->cipher->iv_len);
  90 +
  91 +       for (i = 0; ciphers[i].id; i++)
  92 +               if (ctx->cipher->nid == ciphers[i].nid &&
  93 +                   ctx->cipher->iv_len <= ciphers[i].ivmax &&
  94 +                   ctx->key_len == ciphers[i].keylen) {
  95 +                       cipher = ciphers[i].id;
  96 +                       break;
  97 +               }
  98 +
  99 +       if (!ciphers[i].id) {
 100 +               state->d_fd = -1;
 101 +               return 0;
 102 +       }
 103 +
 104 +       memset(sess, 0, sizeof(struct session_op));
 105 +
 106 +       if ((state->d_fd = get_dev_crypto()) < 0)
 107 +               return 0;
 108 +
 109 +       sess->key = (unsigned char *) key;
 110 +       sess->keylen = ctx->key_len;
 111 +       sess->cipher = cipher;
 112 +
 113 +       if (ioctl(state->d_fd, CIOCGSESSION, sess) == -1) {
 114 +               put_dev_crypto(state->d_fd);
 115 +               state->d_fd = -1;
 116 +               return 0;
 117 +       }
 118 +       return 1;
 119 +}
 120 +
 121 +static int cryptodev_gcm_tls_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 122 +               const unsigned char *in, size_t len)
 123 +{
 124 +       struct crypt_auth_op cryp = {0};
 125 +       struct dev_crypto_state *state = ctx->cipher_data;
 126 +       struct session_op *sess = &state->d_sess;
 127 +       int rv = len;
 128 +
 129 +       if (EVP_CIPHER_CTX_ctrl(ctx, ctx->encrypt ?
 130 +                       EVP_CTRL_GCM_IV_GEN : EVP_CTRL_GCM_SET_IV_INV,
 131 +                       EVP_GCM_TLS_EXPLICIT_IV_LEN, out) <= 0)
 132 +               return 0;
 133 +
 134 +       in += EVP_GCM_TLS_EXPLICIT_IV_LEN;
 135 +       out += EVP_GCM_TLS_EXPLICIT_IV_LEN;
 136 +       len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;
 137 +
 138 +       if (ctx->encrypt) {
 139 +               len -= EVP_GCM_TLS_TAG_LEN;
 140 +       }
 141 +       cryp.ses = sess->ses;
 142 +       cryp.len = len;
 143 +       cryp.src = (unsigned char*) in;
 144 +       cryp.dst = out;
 145 +       cryp.auth_src = state->aad;
 146 +       cryp.auth_len = state->aad_len;
 147 +       cryp.iv = ctx->iv;
 148 +       cryp.op = ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT;
 149 +
 150 +       if (ioctl(state->d_fd, CIOCAUTHCRYPT, &cryp) == -1) {
 151 +               return 0;
 152 +       }
 153 +
 154 +       if (ctx->encrypt)
 155 +               ctr64_inc(state->iv + state->ivlen - 8);
 156 +       else
 157 +               rv = len - EVP_GCM_TLS_TAG_LEN;
 158 +
 159 +       return rv;
 160 +}
 161 +
 162 +static int cryptodev_gcm_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 163 +               const unsigned char *in, size_t len)
 164 +{
 165 +       struct crypt_auth_op cryp;
 166 +       struct dev_crypto_state *state = ctx->cipher_data;
 167 +       struct session_op *sess = &state->d_sess;
 168 +
 169 +       if (state->d_fd < 0)
 170 +               return 0;
 171 +
 172 +       if ((len % ctx->cipher->block_size) != 0)
 173 +               return 0;
 174 +
 175 +       if (state->aad_len >= 0)
 176 +               return cryptodev_gcm_tls_cipher(ctx, out, in, len);
 177 +
 178 +       memset(&cryp, 0, sizeof(cryp));
 179 +
 180 +       cryp.ses = sess->ses;
 181 +       cryp.len = len;
 182 +       cryp.src = (unsigned char*) in;
 183 +       cryp.dst = out;
 184 +       cryp.auth_src = NULL;
 185 +       cryp.auth_len = 0;
 186 +       cryp.iv = ctx->iv;
 187 +       cryp.op = ctx->encrypt ? COP_ENCRYPT : COP_DECRYPT;
 188 +
 189 +       if (ioctl(state->d_fd, CIOCAUTHCRYPT, &cryp) == -1) {
 190 +               return 0;
 191 +       }
 192 +
 193 +       return len;
 194 +}
 195 +
 196 +static int cryptodev_gcm_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
 197 +               void *ptr)
 198 +{
 199 +       struct dev_crypto_state *state = ctx->cipher_data;
 200 +       switch (type) {
 201 +       case EVP_CTRL_INIT:
 202 +       {
 203 +               state->ivlen = ctx->cipher->iv_len;
 204 +               state->iv = ctx->iv;
 205 +               state->aad_len = -1;
 206 +               return 1;
 207 +       }
 208 +       case EVP_CTRL_GCM_SET_IV_FIXED:
 209 +       {
 210 +               /* Special case: -1 length restores whole IV */
 211 +               if (arg == -1)
 212 +                       {
 213 +                       memcpy(state->iv, ptr, state->ivlen);
 214 +                       return 1;
 215 +                       }
 216 +               /* Fixed field must be at least 4 bytes and invocation field
 217 +                * at least 8.
 218 +                */
 219 +               if ((arg < 4) || (state->ivlen - arg) < 8)
 220 +                       return 0;
 221 +               if (arg)
 222 +                       memcpy(state->iv, ptr, arg);
 223 +               if (ctx->encrypt &&
 224 +                       RAND_bytes(state->iv + arg, state->ivlen - arg) <= 0)
 225 +                       return 0;
 226 +               return 1;
 227 +       }
 228 +       case EVP_CTRL_AEAD_TLS1_AAD:
 229 +       {
 230 +               unsigned int len;
 231 +               if (arg != 13)
 232 +                       return 0;
 233 +
 234 +               memcpy(ctx->buf, ptr, arg);
 235 +               len=ctx->buf[arg-2] << 8 | ctx->buf[arg-1];
 236 +
 237 +               /* Correct length for explicit IV */
 238 +               len -= EVP_GCM_TLS_EXPLICIT_IV_LEN;
 239 +
 240 +               /* If decrypting correct for tag too */
 241 +               if (!ctx->encrypt)
 242 +                       len -= EVP_GCM_TLS_TAG_LEN;
 243 +
 244 +               ctx->buf[arg-2] = len >> 8;
 245 +               ctx->buf[arg-1] = len & 0xff;
 246 +
 247 +               state->aad = ctx->buf;
 248 +               state->aad_len = arg;
 249 +               state->len = len;
 250 +
 251 +               /* Extra padding: tag appended to record */
 252 +               return EVP_GCM_TLS_TAG_LEN;
 253 +       }
 254 +       case EVP_CTRL_GCM_SET_IV_INV:
 255 +       {
 256 +               if (ctx->encrypt)
 257 +                       return 0;
 258 +               memcpy(state->iv + state->ivlen - arg, ptr, arg);
 259 +               return 1;
 260 +       }
 261 +       case EVP_CTRL_GCM_IV_GEN:
 262 +               if (arg <= 0 || arg > state->ivlen)
 263 +                       arg = state->ivlen;
 264 +               memcpy(ptr, state->iv + state->ivlen - arg, arg);
 265 +               return 1;
 266 +       default:
 267 +               return -1;
 268 +       }
 269 +}
 270  /*
 271   * libcrypto EVP stuff - this is how we get wired to EVP so the engine
 272   * gets called when libcrypto requests a cipher NID.
 273 @@ -901,6 +1108,23 @@ const EVP_CIPHER cryptodev_aes_256_cbc_hmac_sha1 = {
 274         cryptodev_cbc_hmac_sha1_ctrl,
 275         NULL
 276  };
 277 +
 278 +const EVP_CIPHER cryptodev_aes_128_gcm = {
 279 +       NID_aes_128_gcm,
 280 +       1, 16, 12,
 281 +       EVP_CIPH_GCM_MODE | EVP_CIPH_FLAG_AEAD_CIPHER | EVP_CIPH_FLAG_DEFAULT_ASN1 \
 282 +       | EVP_CIPH_CUSTOM_IV | EVP_CIPH_FLAG_CUSTOM_CIPHER \
 283 +       | EVP_CIPH_ALWAYS_CALL_INIT | EVP_CIPH_CTRL_INIT,
 284 +       cryptodev_init_gcm_key,
 285 +       cryptodev_gcm_cipher,
 286 +       cryptodev_cleanup,
 287 +       sizeof(struct dev_crypto_state),
 288 +       EVP_CIPHER_set_asn1_iv,
 289 +       EVP_CIPHER_get_asn1_iv,
 290 +       cryptodev_gcm_ctrl,
 291 +       NULL
 292 +};
 293 +
 294  /*
 295   * Registered by the ENGINE when used to find out how to deal with
 296   * a particular NID in the ENGINE. this says what we'll do at the
 297 @@ -944,6 +1168,9 @@ cryptodev_engine_ciphers(ENGINE *e, const EVP_CIPHER **cipher,
 298         case NID_aes_256_cbc_hmac_sha1:
 299                 *cipher = &cryptodev_aes_256_cbc_hmac_sha1;
 300                 break;
 301 +       case NID_aes_128_gcm:
 302 +               *cipher = &cryptodev_aes_128_gcm;
 303 +               break;
 304         default:
 305                 *cipher = NULL;
 306                 break;
 307 --
 308 1.8.3.1
 309