crypto/pbkdf-nettle.c

   1 /*
   2  * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
   3  *
   4  * Copyright (c) 2015-2016 Red Hat, Inc.
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20
  21 #include "qemu/osdep.h"
  22 #include <nettle/pbkdf2.h>
  23 #include <nettle/hmac.h>
  24 #include "qapi/error.h"
  25 #include "crypto/pbkdf.h"
  26
  27
  28 bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
  29 {
  30     switch (hash) {
  31     case QCRYPTO_HASH_ALG_SHA1:
  32     case QCRYPTO_HASH_ALG_SHA224:
  33     case QCRYPTO_HASH_ALG_SHA256:
  34     case QCRYPTO_HASH_ALG_SHA384:
  35     case QCRYPTO_HASH_ALG_SHA512:
  36     case QCRYPTO_HASH_ALG_RIPEMD160:
  37         return true;
  38     default:
  39         return false;
  40     }
  41 }
  42
  43 int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
  44                    const uint8_t *key, size_t nkey,
  45                    const uint8_t *salt, size_t nsalt,
  46                    uint64_t iterations,
  47                    uint8_t *out, size_t nout,
  48                    Error **errp)
  49 {
  50     union {
  51         struct hmac_md5_ctx md5;
  52         struct hmac_sha1_ctx sha1;
  53         struct hmac_sha224_ctx sha224;
  54         struct hmac_sha256_ctx sha256;
  55         struct hmac_sha384_ctx sha384;
  56         struct hmac_sha512_ctx sha512;
  57         struct hmac_ripemd160_ctx ripemd160;
  58     } ctx;
  59
  60     if (iterations > UINT_MAX) {
  61         error_setg_errno(errp, ERANGE,
  62                          "PBKDF iterations %llu must be less than %u",
  63                          (long long unsigned)iterations, UINT_MAX);
  64         return -1;
  65     }
  66
  67     switch (hash) {
  68     case QCRYPTO_HASH_ALG_MD5:
  69         hmac_md5_set_key(&ctx.md5, nkey, key);
  70         PBKDF2(&ctx.md5, hmac_md5_update, hmac_md5_digest,
  71                MD5_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
  72         break;
  73
  74     case QCRYPTO_HASH_ALG_SHA1:
  75         hmac_sha1_set_key(&ctx.sha1, nkey, key);
  76         PBKDF2(&ctx.sha1, hmac_sha1_update, hmac_sha1_digest,
  77                SHA1_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
  78         break;
  79
  80     case QCRYPTO_HASH_ALG_SHA224:
  81         hmac_sha224_set_key(&ctx.sha224, nkey, key);
  82         PBKDF2(&ctx.sha224, hmac_sha224_update, hmac_sha224_digest,
  83                SHA224_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
  84         break;
  85
  86     case QCRYPTO_HASH_ALG_SHA256:
  87         hmac_sha256_set_key(&ctx.sha256, nkey, key);
  88         PBKDF2(&ctx.sha256, hmac_sha256_update, hmac_sha256_digest,
  89                SHA256_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
  90         break;
  91
  92     case QCRYPTO_HASH_ALG_SHA384:
  93         hmac_sha384_set_key(&ctx.sha384, nkey, key);
  94         PBKDF2(&ctx.sha384, hmac_sha384_update, hmac_sha384_digest,
  95                SHA384_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
  96         break;
  97
  98     case QCRYPTO_HASH_ALG_SHA512:
  99         hmac_sha512_set_key(&ctx.sha512, nkey, key);
 100         PBKDF2(&ctx.sha512, hmac_sha512_update, hmac_sha512_digest,
 101                SHA512_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
 102         break;
 103
 104     case QCRYPTO_HASH_ALG_RIPEMD160:
 105         hmac_ripemd160_set_key(&ctx.ripemd160, nkey, key);
 106         PBKDF2(&ctx.ripemd160, hmac_ripemd160_update, hmac_ripemd160_digest,
 107                RIPEMD160_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
 108         break;
 109
 110     default:
 111         error_setg_errno(errp, ENOSYS,
 112                          "PBKDF does not support hash algorithm %s",
 113                          QCryptoHashAlgorithm_str(hash));
 114         return -1;
 115     }
 116     return 0;
 117 }