Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 144 insertions, 0 deletions

diff --git a/crypto/hash.c b/crypto/hash.c
new file mode 100644
index 000000000..b0f8228bd
--- /dev/null
+++ b/crypto/hash.c
@@ -0,0 +1,144 @@
+/*
+ * 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 2.1 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/hash.h"
+#include "hashpriv.h"
+
+static size_t qcrypto_hash_alg_size[QCRYPTO_HASH_ALG__MAX] = {
+    [QCRYPTO_HASH_ALG_MD5] = 16,
+    [QCRYPTO_HASH_ALG_SHA1] = 20,
+    [QCRYPTO_HASH_ALG_SHA224] = 28,
+    [QCRYPTO_HASH_ALG_SHA256] = 32,
+    [QCRYPTO_HASH_ALG_SHA384] = 48,
+    [QCRYPTO_HASH_ALG_SHA512] = 64,
+    [QCRYPTO_HASH_ALG_RIPEMD160] = 20,
+};
+
+size_t qcrypto_hash_digest_len(QCryptoHashAlgorithm alg)
+{
+    assert(alg < G_N_ELEMENTS(qcrypto_hash_alg_size));
+    return qcrypto_hash_alg_size[alg];
+}
+
+int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
+                        const struct iovec *iov,
+                        size_t niov,
+                        uint8_t **result,
+                        size_t *resultlen,
+                        Error **errp)
+{
+#ifdef CONFIG_AF_ALG
+    int ret;
+    /*
+     * TODO:
+     * Maybe we should treat some afalg errors as fatal
+     */
+    ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
+                                                result, resultlen,
+                                                NULL);
+    if (ret == 0) {
+        return ret;
+    }
+#endif
+
+    return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
+                                               result, resultlen,
+                                               errp);
+}
+
+
+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);
+}