LXR qemu/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
  28bool 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
  43int 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}
 118