crypto: hash: add afalg-backend hash support

Adds afalg-backend hash support: introduces some private APIs
firstly, and then intergrates them into qcrypto_hash_afalg_driver.

Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

crypto/Makefile.objs

@@ -12,6 +12,7 @@ crypto-obj-y += desrfb.o
 crypto-obj-y += cipher.o
 crypto-obj-$(CONFIG_AF_ALG) += afalg.o
 crypto-obj-$(CONFIG_AF_ALG) += cipher-afalg.o
+crypto-obj-$(CONFIG_AF_ALG) += hash-afalg.o
 crypto-obj-y += tlscreds.o
 crypto-obj-y += tlscredsanon.o
 crypto-obj-y += tlscredsx509.o

crypto/afalgpriv.h

@@ -24,6 +24,7 @@
 #endif
 
 #define AFALG_TYPE_CIPHER "skcipher"
+#define AFALG_TYPE_HASH "hash"
 
 #define ALG_OPTYPE_LEN 4
 #define ALG_MSGIV_LEN(len) (sizeof(struct af_alg_iv) + (len))

crypto/hash-afalg.c

@@ -0,0 +1,136 @@
+/*
+ * QEMU Crypto af_alg-backend hash support
+ *
+ * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ * Authors:
+ *    Longpeng(Mike) <longpeng2@huawei.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+#include "qemu/osdep.h"
+#include "qemu/iov.h"
+#include "qemu/sockets.h"
+#include "qemu-common.h"
+#include "qapi/error.h"
+#include "crypto/hash.h"
+#include "hashpriv.h"
+
+static char *
+qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
+                               Error **errp)
+{
+    char *name;
+    const char *alg_name;
+
+    switch (alg) {
+    case QCRYPTO_HASH_ALG_MD5:
+        alg_name = "md5";
+        break;
+    case QCRYPTO_HASH_ALG_SHA1:
+        alg_name = "sha1";
+        break;
+    case QCRYPTO_HASH_ALG_SHA224:
+        alg_name = "sha224";
+        break;
+    case QCRYPTO_HASH_ALG_SHA256:
+        alg_name = "sha256";
+        break;
+    case QCRYPTO_HASH_ALG_SHA384:
+        alg_name = "sha384";
+        break;
+    case QCRYPTO_HASH_ALG_SHA512:
+        alg_name = "sha512";
+        break;
+    case QCRYPTO_HASH_ALG_RIPEMD160:
+        alg_name = "rmd160";
+        break;
+
+    default:
+        error_setg(errp, "Unsupported hash algorithm %d", alg);
+        return NULL;
+    }
+
+    name = g_strdup_printf("%s", alg_name);
+
+    return name;
+}
+
+static QCryptoAFAlg *
+qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg, Error **errp)
+{
+    QCryptoAFAlg *afalg;
+    char *name;
+
+    name = qcrypto_afalg_hash_format_name(alg, errp);
+    if (!name) {
+        return NULL;
+    }
+
+    afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_HASH, name, errp);
+    if (!afalg) {
+        g_free(name);
+        return NULL;
+    }
+
+    g_free(name);
+
+    return afalg;
+}
+
+static int
+qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
+                          const struct iovec *iov,
+                          size_t niov, uint8_t **result,
+                          size_t *resultlen,
+                          Error **errp)
+{
+    QCryptoAFAlg *afalg;
+    struct iovec outv;
+    int ret = 0;
+    const int expect_len = qcrypto_hash_digest_len(alg);
+
+    if (*resultlen == 0) {
+        *resultlen = expect_len;
+        *result = g_new0(uint8_t, *resultlen);
+    } else if (*resultlen != expect_len) {
+        error_setg(errp,
+                   "Result buffer size %zu is not match hash %d",
+                   *resultlen, expect_len);
+        return -1;
+    }
+
+    afalg = qcrypto_afalg_hash_ctx_new(alg, errp);
+    if (!afalg) {
+        return -1;
+    }
+
+    /* send data to kernel's crypto core */
+    ret = iov_send_recv(afalg->opfd, iov, niov,
+                        0, iov_size(iov, niov), true);
+    if (ret < 0) {
+        error_setg_errno(errp, errno, "Send data to afalg-core failed");
+        goto out;
+    }
+
+    /* hash && get result */
+    outv.iov_base = *result;
+    outv.iov_len = *resultlen;
+    ret = iov_send_recv(afalg->opfd, &outv, 1,
+                        0, iov_size(&outv, 1), false);
+    if (ret < 0) {
+        error_setg_errno(errp, errno, "Recv result from afalg-core failed");
+    } else {
+        ret = 0;
+    }
+
+out:
+    qcrypto_afalg_comm_free(afalg);
+    return ret;
+}
+
+QCryptoHashDriver qcrypto_hash_afalg_driver = {
+    .hash_bytesv = qcrypto_afalg_hash_bytesv,
+};

crypto/hash.c

@@ -46,6 +46,23 @@ int qcrypto_hash_bytesv(QCryptoHashAlgorithm alg,
                         size_t *resultlen,
                         Error **errp)
 {
+#ifdef CONFIG_AF_ALG
+    int ret;
+
+    ret = qcrypto_hash_afalg_driver.hash_bytesv(alg, iov, niov,
+                                                result, resultlen,
+                                                errp);
+    if (ret == 0) {
+        return ret;
+    }
+
+    /*
+     * TODO:
+     * Maybe we should treat some afalg errors as fatal
+     */
+    error_free(*errp);
+#endif
+
     return qcrypto_hash_lib_driver.hash_bytesv(alg, iov, niov,
                                                result, resultlen,
                                                errp);

crypto/hashpriv.h

@@ -28,4 +28,12 @@ struct QCryptoHashDriver {
 
 extern QCryptoHashDriver qcrypto_hash_lib_driver;
 
+#ifdef CONFIG_AF_ALG
+
+#include "afalgpriv.h"
+
+extern QCryptoHashDriver qcrypto_hash_afalg_driver;
+
+#endif
+
 #endif