From: Alejandro Zeise <alejandro.ze...@seagate.com>
Updates the afalg hash driver to support the new accumulative
hashing changes as part of the patch series.
Implements opening/closing of contexts, updating hash data
and finalizing the hash digest.
In order to support the update function, a flag needs to be passed
to the kernel via the socket send call (MSG_MORE) to notify it that more
data is to be expected to calculate the hash correctly.
As a result, a new function was added to the iov helper utils to allow
passing a flag to the socket send call.
Signed-off-by: Alejandro Zeise <alejandro.ze...@seagate.com>
[ clg: - Handled qcrypto_afalg_hash_ctx_new() errors in
qcrypto_afalg_hash_new()
- Freed alg_name in qcrypto_afalg_hash_new()
- Reworked qcrypto_afalg_recv_from_kernel()
- Split iov changes from original patch ]
Signed-off-by: Cédric Le Goater <c...@redhat.com>
Reviewed-by: Daniel P. Berrangé <berra...@redhat.com>
Signed-off-by: Daniel P. Berrangé <berra...@redhat.com>
---
crypto/hash-afalg.c | 127 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 127 insertions(+)
diff --git a/crypto/hash-afalg.c b/crypto/hash-afalg.c
index 28ab899b18..5fbbee288e 100644
--- a/crypto/hash-afalg.c
+++ b/crypto/hash-afalg.c
@@ -1,6 +1,7 @@
/*
* QEMU Crypto af_alg-backend hash/hmac support
*
+ * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
* Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
*
* Authors:
@@ -113,6 +114,128 @@ qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgo alg,
return qcrypto_afalg_hash_hmac_ctx_new(alg, key, nkey, true, errp);
}
+static
+QCryptoHash *qcrypto_afalg_hash_new(QCryptoHashAlgo alg, Error **errp)
+{
+ /* Check if hash algorithm is supported */
+ char *alg_name = qcrypto_afalg_hash_format_name(alg, false, NULL);
+ QCryptoHash *hash;
+
+ if (alg_name == NULL) {
+ error_setg(errp, "Unknown hash algorithm %d", alg);
+ return NULL;
+ }
+
+ g_free(alg_name);
+
+ hash = g_new(QCryptoHash, 1);
+ hash->alg = alg;
+ hash->opaque = qcrypto_afalg_hash_ctx_new(alg, errp);
+ if (!hash->opaque) {
+ free(hash);
+ return NULL;
+ }
+
+ return hash;
+}
+
+static
+void qcrypto_afalg_hash_free(QCryptoHash *hash)
+{
+ QCryptoAFAlg *ctx = hash->opaque;
+
+ if (ctx) {
+ qcrypto_afalg_comm_free(ctx);
+ }
+
+ g_free(hash);
+}
+
+/**
+ * Send data to the kernel's crypto core.
+ *
+ * The more_data parameter is used to notify the crypto engine
+ * that this is an "update" operation, and that more data will
+ * be provided to calculate the final hash.
+ */
+static
+int qcrypto_afalg_send_to_kernel(QCryptoAFAlg *afalg,
+ const struct iovec *iov,
+ size_t niov,
+ bool more_data,
+ Error **errp)
+{
+ int ret = 0;
+ int flags = (more_data ? MSG_MORE : 0);
+
+ /* send data to kernel's crypto core */
+ ret = iov_send_recv_with_flags(afalg->opfd, flags, iov, niov,
+ 0, iov_size(iov, niov), true);
+ if (ret < 0) {
+ error_setg_errno(errp, errno, "Send data to afalg-core failed");
+ ret = -1;
+ } else {
+ /* No error, so return 0 */
+ ret = 0;
+ }
+
+ return ret;
+}
+
+static
+int qcrypto_afalg_recv_from_kernel(QCryptoAFAlg *afalg,
+ QCryptoHashAlgo alg,
+ uint8_t **result,
+ size_t *result_len,
+ Error **errp)
+{
+ struct iovec outv;
+ int ret;
+ const int expected_len = qcrypto_hash_digest_len(alg);
+
+ if (*result_len == 0) {
+ *result_len = expected_len;
+ *result = g_new0(uint8_t, *result_len);
+ } else if (*result_len != expected_len) {
+ error_setg(errp,
+ "Result buffer size %zu is not match hash %d",
+ *result_len, expected_len);
+ return -1;
+ }
+
+ /* hash && get result */
+ outv.iov_base = *result;
+ outv.iov_len = *result_len;
+ 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");
+ return -1;
+ }
+
+ return 0;
+}
+
+static
+int qcrypto_afalg_hash_update(QCryptoHash *hash,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ return qcrypto_afalg_send_to_kernel((QCryptoAFAlg *) hash->opaque,
+ iov, niov, true, errp);
+}
+
+static
+int qcrypto_afalg_hash_finalize(QCryptoHash *hash,
+ uint8_t **result,
+ size_t *result_len,
+ Error **errp)
+{
+ return qcrypto_afalg_recv_from_kernel((QCryptoAFAlg *) hash->opaque,
+ hash->alg, result, result_len, errp);
+}
+
static int
qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlgo *hmac,
QCryptoHashAlgo alg,
@@ -205,6 +328,10 @@ static void qcrypto_afalg_hmac_ctx_free(QCryptoHmac *hmac)
QCryptoHashDriver qcrypto_hash_afalg_driver = {
.hash_bytesv = qcrypto_afalg_hash_bytesv,
+ .hash_new = qcrypto_afalg_hash_new,
+ .hash_free = qcrypto_afalg_hash_free,
+ .hash_update = qcrypto_afalg_hash_update,
+ .hash_finalize = qcrypto_afalg_hash_finalize
};
QCryptoHmacDriver qcrypto_hmac_afalg_driver = {
--
2.46.0
