ed754746fe
If we are linking to gnutls already and gnutls is built against nettle, then we should use nettle as a cipher backend in preference to our built-in backend. This will be used when linking against some GNUTLS 2.x versions and all GNUTLS 3.x versions. Signed-off-by: Daniel P. Berrange <berrange@redhat.com> Message-Id: <1435770638-25715-7-git-send-email-berrange@redhat.com> [Change "#elif" to "#elif defined". - Paolo] Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
75 lines
2.2 KiB
C
75 lines
2.2 KiB
C
/*
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* QEMU Crypto cipher algorithms
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*
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* Copyright (c) 2015 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 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 "crypto/cipher.h"
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static size_t alg_key_len[QCRYPTO_CIPHER_ALG_LAST] = {
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[QCRYPTO_CIPHER_ALG_AES_128] = 16,
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[QCRYPTO_CIPHER_ALG_AES_192] = 24,
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[QCRYPTO_CIPHER_ALG_AES_256] = 32,
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[QCRYPTO_CIPHER_ALG_DES_RFB] = 8,
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};
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static bool
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qcrypto_cipher_validate_key_length(QCryptoCipherAlgorithm alg,
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size_t nkey,
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Error **errp)
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{
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if ((unsigned)alg >= QCRYPTO_CIPHER_ALG_LAST) {
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error_setg(errp, "Cipher algorithm %d out of range",
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alg);
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return false;
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}
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if (alg_key_len[alg] != nkey) {
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error_setg(errp, "Cipher key length %zu should be %zu",
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alg_key_len[alg], nkey);
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return false;
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}
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return true;
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}
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#if defined(CONFIG_GNUTLS_GCRYPT) || defined(CONFIG_GNUTLS_NETTLE)
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static uint8_t *
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qcrypto_cipher_munge_des_rfb_key(const uint8_t *key,
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size_t nkey)
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{
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uint8_t *ret = g_new0(uint8_t, nkey);
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size_t i;
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for (i = 0; i < nkey; i++) {
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uint8_t r = key[i];
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r = (r & 0xf0) >> 4 | (r & 0x0f) << 4;
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r = (r & 0xcc) >> 2 | (r & 0x33) << 2;
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r = (r & 0xaa) >> 1 | (r & 0x55) << 1;
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ret[i] = r;
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}
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return ret;
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}
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#endif /* CONFIG_GNUTLS_GCRYPT || CONFIG_GNUTLS_NETTLE */
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#ifdef CONFIG_GNUTLS_GCRYPT
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#include "crypto/cipher-gcrypt.c"
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#elif defined CONFIG_GNUTLS_NETTLE
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#include "crypto/cipher-nettle.c"
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#else
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#include "crypto/cipher-builtin.c"
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#endif
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