qemu

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/*
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 * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
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 *
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 * Copyright (c) 2015-2016 Red Hat, Inc.
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 *
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 * This library is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
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 *
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 */
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#include "qemu/osdep.h"
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#include <nettle/pbkdf2.h>
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#include <nettle/hmac.h>
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#include "qapi/error.h"
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#include "crypto/pbkdf.h"
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bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
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{
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    switch (hash) {
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    case QCRYPTO_HASH_ALG_SHA1:
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    case QCRYPTO_HASH_ALG_SHA224:
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    case QCRYPTO_HASH_ALG_SHA256:
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    case QCRYPTO_HASH_ALG_SHA384:
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    case QCRYPTO_HASH_ALG_SHA512:
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    case QCRYPTO_HASH_ALG_RIPEMD160:
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        return true;
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    default:
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        return false;
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    }
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}
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int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
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                   const uint8_t *key, size_t nkey,
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                   const uint8_t *salt, size_t nsalt,
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                   uint64_t iterations,
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                   uint8_t *out, size_t nout,
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                   Error **errp)
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{
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    union {
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        struct hmac_md5_ctx md5;
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        struct hmac_sha1_ctx sha1;
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        struct hmac_sha224_ctx sha224;
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        struct hmac_sha256_ctx sha256;
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        struct hmac_sha384_ctx sha384;
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        struct hmac_sha512_ctx sha512;
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        struct hmac_ripemd160_ctx ripemd160;
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    } ctx;
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    if (iterations > UINT_MAX) {
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        error_setg_errno(errp, ERANGE,
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                         "PBKDF iterations %llu must be less than %u",
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                         (long long unsigned)iterations, UINT_MAX);
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        return -1;
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    }
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    switch (hash) {
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    case QCRYPTO_HASH_ALG_MD5:
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        hmac_md5_set_key(&ctx.md5, nkey, key);
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        PBKDF2(&ctx.md5, hmac_md5_update, hmac_md5_digest,
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               MD5_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_SHA1:
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        hmac_sha1_set_key(&ctx.sha1, nkey, key);
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        PBKDF2(&ctx.sha1, hmac_sha1_update, hmac_sha1_digest,
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               SHA1_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_SHA224:
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        hmac_sha224_set_key(&ctx.sha224, nkey, key);
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        PBKDF2(&ctx.sha224, hmac_sha224_update, hmac_sha224_digest,
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               SHA224_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_SHA256:
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        hmac_sha256_set_key(&ctx.sha256, nkey, key);
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        PBKDF2(&ctx.sha256, hmac_sha256_update, hmac_sha256_digest,
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               SHA256_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_SHA384:
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        hmac_sha384_set_key(&ctx.sha384, nkey, key);
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        PBKDF2(&ctx.sha384, hmac_sha384_update, hmac_sha384_digest,
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               SHA384_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_SHA512:
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        hmac_sha512_set_key(&ctx.sha512, nkey, key);
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        PBKDF2(&ctx.sha512, hmac_sha512_update, hmac_sha512_digest,
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               SHA512_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    case QCRYPTO_HASH_ALG_RIPEMD160:
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        hmac_ripemd160_set_key(&ctx.ripemd160, nkey, key);
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        PBKDF2(&ctx.ripemd160, hmac_ripemd160_update, hmac_ripemd160_digest,
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               RIPEMD160_DIGEST_SIZE, iterations, nsalt, salt, nout, out);
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        break;
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    default:
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        error_setg_errno(errp, ENOSYS,
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                         "PBKDF does not support hash algorithm %s",
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                         QCryptoHashAlgorithm_str(hash));
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        return -1;
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    }
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    return 0;
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}
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