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-rw-r--r--crypto/Makefile.objs4
-rw-r--r--crypto/pbkdf-gcrypt.c68
-rw-r--r--crypto/pbkdf-nettle.c65
-rw-r--r--crypto/pbkdf-stub.c42
-rw-r--r--crypto/pbkdf.c109
5 files changed, 288 insertions, 0 deletions
diff --git a/crypto/Makefile.objs b/crypto/Makefile.objs
index 967418c67a..7122cc8e54 100644
--- a/crypto/Makefile.objs
+++ b/crypto/Makefile.objs
@@ -10,8 +10,12 @@ crypto-obj-y += tlssession.o
crypto-obj-y += secret.o
crypto-obj-$(CONFIG_GCRYPT) += random-gcrypt.o
crypto-obj-$(if $(CONFIG_GCRYPT),n,$(CONFIG_GNUTLS_RND)) += random-gnutls.o
+crypto-obj-y += pbkdf.o
+crypto-obj-$(CONFIG_NETTLE) += pbkdf-nettle.o
+crypto-obj-$(if $(CONFIG_NETTLE),n,$(CONFIG_GCRYPT_KDF)) += pbkdf-gcrypt.o
# Let the userspace emulators avoid linking gnutls/etc
crypto-aes-obj-y = aes.o
stub-obj-y += random-stub.o
+stub-obj-y += pbkdf-stub.o
diff --git a/crypto/pbkdf-gcrypt.c b/crypto/pbkdf-gcrypt.c
new file mode 100644
index 0000000000..885614dfcc
--- /dev/null
+++ b/crypto/pbkdf-gcrypt.c
@@ -0,0 +1,68 @@
+/*
+ * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "crypto/pbkdf.h"
+#include "gcrypt.h"
+
+bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
+{
+ switch (hash) {
+ case QCRYPTO_HASH_ALG_MD5:
+ case QCRYPTO_HASH_ALG_SHA1:
+ case QCRYPTO_HASH_ALG_SHA256:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
+ const uint8_t *key, size_t nkey,
+ const uint8_t *salt, size_t nsalt,
+ unsigned int iterations,
+ uint8_t *out, size_t nout,
+ Error **errp)
+{
+ static const int hash_map[QCRYPTO_HASH_ALG__MAX] = {
+ [QCRYPTO_HASH_ALG_MD5] = GCRY_MD_MD5,
+ [QCRYPTO_HASH_ALG_SHA1] = GCRY_MD_SHA1,
+ [QCRYPTO_HASH_ALG_SHA256] = GCRY_MD_SHA256,
+ };
+ int ret;
+
+ if (hash >= G_N_ELEMENTS(hash_map) ||
+ hash_map[hash] == GCRY_MD_NONE) {
+ error_setg(errp, "Unexpected hash algorithm %d", hash);
+ return -1;
+ }
+
+ ret = gcry_kdf_derive(key, nkey, GCRY_KDF_PBKDF2,
+ hash_map[hash],
+ salt, nsalt, iterations,
+ nout, out);
+ if (ret != 0) {
+ error_setg(errp, "Cannot derive password: %s",
+ gcry_strerror(ret));
+ return -1;
+ }
+
+ return 0;
+}
diff --git a/crypto/pbkdf-nettle.c b/crypto/pbkdf-nettle.c
new file mode 100644
index 0000000000..1aa7395ea5
--- /dev/null
+++ b/crypto/pbkdf-nettle.c
@@ -0,0 +1,65 @@
+/*
+ * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "crypto/pbkdf.h"
+#include "nettle/pbkdf2.h"
+
+
+bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash)
+{
+ switch (hash) {
+ case QCRYPTO_HASH_ALG_SHA1:
+ case QCRYPTO_HASH_ALG_SHA256:
+ return true;
+ default:
+ return false;
+ }
+}
+
+int qcrypto_pbkdf2(QCryptoHashAlgorithm hash,
+ const uint8_t *key, size_t nkey,
+ const uint8_t *salt, size_t nsalt,
+ unsigned int iterations,
+ uint8_t *out, size_t nout,
+ Error **errp)
+{
+ switch (hash) {
+ case QCRYPTO_HASH_ALG_SHA1:
+ pbkdf2_hmac_sha1(nkey, key,
+ iterations,
+ nsalt, salt,
+ nout, out);
+ break;
+
+ case QCRYPTO_HASH_ALG_SHA256:
+ pbkdf2_hmac_sha256(nkey, key,
+ iterations,
+ nsalt, salt,
+ nout, out);
+ break;
+
+ default:
+ error_setg_errno(errp, ENOSYS,
+ "PBKDF does not support hash algorithm %d", hash);
+ return -1;
+ }
+ return 0;
+}
diff --git a/crypto/pbkdf-stub.c b/crypto/pbkdf-stub.c
new file mode 100644
index 0000000000..cfc30d3c2a
--- /dev/null
+++ b/crypto/pbkdf-stub.c
@@ -0,0 +1,42 @@
+/*
+ * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "crypto/pbkdf.h"
+
+bool qcrypto_pbkdf2_supports(QCryptoHashAlgorithm hash G_GNUC_UNUSED)
+{
+ return false;
+}
+
+int qcrypto_pbkdf2(QCryptoHashAlgorithm hash G_GNUC_UNUSED,
+ const uint8_t *key G_GNUC_UNUSED,
+ size_t nkey G_GNUC_UNUSED,
+ const uint8_t *salt G_GNUC_UNUSED,
+ size_t nsalt G_GNUC_UNUSED,
+ unsigned int iterations G_GNUC_UNUSED,
+ uint8_t *out G_GNUC_UNUSED,
+ size_t nout G_GNUC_UNUSED,
+ Error **errp)
+{
+ error_setg_errno(errp, ENOSYS,
+ "No crypto library supporting PBKDF in this build");
+ return -1;
+}
diff --git a/crypto/pbkdf.c b/crypto/pbkdf.c
new file mode 100644
index 0000000000..90721d85d6
--- /dev/null
+++ b/crypto/pbkdf.c
@@ -0,0 +1,109 @@
+/*
+ * QEMU Crypto PBKDF support (Password-Based Key Derivation Function)
+ *
+ * Copyright (c) 2015-2016 Red Hat, Inc.
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "crypto/pbkdf.h"
+#ifndef _WIN32
+#include <sys/resource.h>
+#endif
+
+
+static int qcrypto_pbkdf2_get_thread_cpu(unsigned long long *val_ms,
+ Error **errp)
+{
+#ifdef _WIN32
+ FILETIME creation_time, exit_time, kernel_time, user_time;
+ ULARGE_INTEGER thread_time;
+
+ if (!GetThreadTimes(GetCurrentThread(), &creation_time, &exit_time,
+ &kernel_time, &user_time)) {
+ error_setg(errp, "Unable to get thread CPU usage");
+ return -1;
+ }
+
+ thread_time.LowPart = user_time.dwLowDateTime;
+ thread_time.HighPart = user_time.dwHighDateTime;
+
+ /* QuadPart is units of 100ns and we want ms as unit */
+ *val_ms = thread_time.QuadPart / 10000ll;
+ return 0;
+#elif defined(RUSAGE_THREAD)
+ struct rusage ru;
+ if (getrusage(RUSAGE_THREAD, &ru) < 0) {
+ error_setg_errno(errp, errno, "Unable to get thread CPU usage");
+ return -1;
+ }
+
+ *val_ms = ((ru.ru_utime.tv_sec * 1000ll) +
+ (ru.ru_utime.tv_usec / 1000));
+ return 0;
+#else
+ *val_ms = 0;
+ error_setg(errp, "Unable to calculate thread CPU usage on this platform");
+ return -1;
+#endif
+}
+
+int qcrypto_pbkdf2_count_iters(QCryptoHashAlgorithm hash,
+ const uint8_t *key, size_t nkey,
+ const uint8_t *salt, size_t nsalt,
+ Error **errp)
+{
+ uint8_t out[32];
+ long long int iterations = (1 << 15);
+ unsigned long long delta_ms, start_ms, end_ms;
+
+ while (1) {
+ if (qcrypto_pbkdf2_get_thread_cpu(&start_ms, errp) < 0) {
+ return -1;
+ }
+ if (qcrypto_pbkdf2(hash,
+ key, nkey,
+ salt, nsalt,
+ iterations,
+ out, sizeof(out),
+ errp) < 0) {
+ return -1;
+ }
+ if (qcrypto_pbkdf2_get_thread_cpu(&end_ms, errp) < 0) {
+ return -1;
+ }
+
+ delta_ms = end_ms - start_ms;
+
+ if (delta_ms > 500) {
+ break;
+ } else if (delta_ms < 100) {
+ iterations = iterations * 10;
+ } else {
+ iterations = (iterations * 1000 / delta_ms);
+ }
+ }
+
+ iterations = iterations * 1000 / delta_ms;
+
+ if (iterations > INT32_MAX) {
+ error_setg(errp, "Iterations %lld too large for a 32-bit int",
+ iterations);
+ return -1;
+ }
+
+ return iterations;
+}
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