Add qemu 2.4.0

[kvmfornfv.git] / qemu / crypto / hash.c

diff --git a/qemu/crypto/hash.c b/qemu/crypto/hash.c
new file mode 100644 (file)
index 0000000..81e74de
--- /dev/null
+++ b/qemu/crypto/hash.c
@@ -0,0 +1,200 @@
+/*
+ * QEMU Crypto hash algorithms
+ *
+ * Copyright (c) 2015 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 "crypto/hash.h"
+
+#ifdef CONFIG_GNUTLS_HASH
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+
+static int qcrypto_hash_alg_map[QCRYPTO_HASH_ALG_LAST] = {
+    [QCRYPTO_HASH_ALG_MD5] = GNUTLS_DIG_MD5,
+    [QCRYPTO_HASH_ALG_SHA1] = GNUTLS_DIG_SHA1,
+    [QCRYPTO_HASH_ALG_SHA256] = GNUTLS_DIG_SHA256,
+};
+
+gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg)
+{
+    if (alg < G_N_ELEMENTS(qcrypto_hash_alg_map)) {
+        return true;
+    }
+    return false;
+}
+
+int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
+                        const struct iovec *iov,
+                        size_t niov,
+                        uint8_t **result,
+                        size_t *resultlen,
+                        Error **errp)
+{
+    int i, ret;
+    gnutls_hash_hd_t dig;
+
+    if (alg >= G_N_ELEMENTS(qcrypto_hash_alg_map)) {
+        error_setg(errp,
+                   "Unknown hash algorithm %d",
+                   alg);
+        return -1;
+    }
+
+    ret = gnutls_hash_init(&dig, qcrypto_hash_alg_map[alg]);
+
+    if (ret < 0) {
+        error_setg(errp,
+                   "Unable to initialize hash algorithm: %s",
+                   gnutls_strerror(ret));
+        return -1;
+    }
+
+    for (i = 0; i < niov; i++) {
+        ret = gnutls_hash(dig, iov[i].iov_base, iov[i].iov_len);
+        if (ret < 0) {
+            error_setg(errp,
+                       "Unable process hash data: %s",
+                       gnutls_strerror(ret));
+            goto error;
+        }
+    }
+
+    ret = gnutls_hash_get_len(qcrypto_hash_alg_map[alg]);
+    if (ret <= 0) {
+        error_setg(errp,
+                   "Unable to get hash length: %s",
+                   gnutls_strerror(ret));
+        goto error;
+    }
+    if (*resultlen == 0) {
+        *resultlen = ret;
+        *result = g_new0(uint8_t, *resultlen);
+    } else if (*resultlen != ret) {
+        error_setg(errp,
+                   "Result buffer size %zu is smaller than hash %d",
+                   *resultlen, ret);
+        goto error;
+    }
+
+    gnutls_hash_deinit(dig, *result);
+    return 0;
+
+ error:
+    gnutls_hash_deinit(dig, NULL);
+    return -1;
+}
+
+#else /* ! CONFIG_GNUTLS_HASH */
+
+gboolean qcrypto_hash_supports(QCryptoHashAlgorithm alg G_GNUC_UNUSED)
+{
+    return false;
+}
+
+int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
+                        const struct iovec *iov G_GNUC_UNUSED,
+                        size_t niov G_GNUC_UNUSED,
+                        uint8_t **result G_GNUC_UNUSED,
+                        size_t *resultlen G_GNUC_UNUSED,
+                        Error **errp)
+{
+    error_setg(errp,
+               "Hash algorithm %d not supported without GNUTLS",
+               alg);
+    return -1;
+}
+
+#endif /* ! CONFIG_GNUTLS_HASH */
+
+int qcrypto_hash_bytes(QCryptoHashAlgorithm alg,
+                       const char *buf,
+                       size_t len,
+                       uint8_t **result,
+                       size_t *resultlen,
+                       Error **errp)
+{
+    struct iovec iov = { .iov_base = (char *)buf,
+                         .iov_len = len };
+    return qcrypto_hash_bytesv(alg, &iov, 1, result, resultlen, errp);
+}
+
+static const char hex[] = "0123456789abcdef";
+
+int qcrypto_hash_digestv(QCryptoHashAlgorithm alg,
+                         const struct iovec *iov,
+                         size_t niov,
+                         char **digest,
+                         Error **errp)
+{
+    uint8_t *result = NULL;
+    size_t resultlen = 0;
+    size_t i;
+
+    if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
+        return -1;
+    }
+
+    *digest = g_new0(char, (resultlen * 2) + 1);
+    for (i = 0 ; i < resultlen ; i++) {
+        (*digest)[(i * 2)] = hex[(result[i] >> 4) & 0xf];
+        (*digest)[(i * 2) + 1] = hex[result[i] & 0xf];
+    }
+    (*digest)[resultlen * 2] = '\0';
+    g_free(result);
+    return 0;
+}
+
+int qcrypto_hash_digest(QCryptoHashAlgorithm alg,
+                        const char *buf,
+                        size_t len,
+                        char **digest,
+                        Error **errp)
+{
+    struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
+
+    return qcrypto_hash_digestv(alg, &iov, 1, digest, errp);
+}
+
+int qcrypto_hash_base64v(QCryptoHashAlgorithm alg,
+                         const struct iovec *iov,
+                         size_t niov,
+                         char **base64,
+                         Error **errp)
+{
+    uint8_t *result = NULL;
+    size_t resultlen = 0;
+
+    if (qcrypto_hash_bytesv(alg, iov, niov, &result, &resultlen, errp) < 0) {
+        return -1;
+    }
+
+    *base64 = g_base64_encode(result, resultlen);
+    g_free(result);
+    return 0;
+}
+
+int qcrypto_hash_base64(QCryptoHashAlgorithm alg,
+                        const char *buf,
+                        size_t len,
+                        char **base64,
+                        Error **errp)
+{
+    struct iovec iov = { .iov_base = (char *)buf, .iov_len = len };
+
+    return qcrypto_hash_base64v(alg, &iov, 1, base64, errp);
+}