From: Alejandro Zeise <alejandro.ze...@seagate.com>
Implements the new hashing API in the nettle hash driver.
Supports creating/destroying a context, updating the context
with input data and obtaining an output hash.
Signed-off-by: Alejandro Zeise <alejandro.ze...@seagate.com>
[ clg: - Dropped qcrypto_hash_supports() in qcrypto_nettle_hash_new() ]
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-nettle.c | 70 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 70 insertions(+)
diff --git a/crypto/hash-nettle.c b/crypto/hash-nettle.c
index 8b08a9c675..07e18ce26c 100644
--- a/crypto/hash-nettle.c
+++ b/crypto/hash-nettle.c
@@ -1,6 +1,7 @@
/*
* QEMU Crypto hash algorithms
*
+ * Copyright (c) 2024 Seagate Technology LLC and/or its Affiliates
* Copyright (c) 2016 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
@@ -155,7 +156,76 @@ qcrypto_nettle_hash_bytesv(QCryptoHashAlgo alg,
return 0;
}
+static
+QCryptoHash *qcrypto_nettle_hash_new(QCryptoHashAlgo alg, Error **errp)
+{
+ QCryptoHash *hash;
+
+ hash = g_new(QCryptoHash, 1);
+ hash->alg = alg;
+ hash->opaque = g_new(union qcrypto_hash_ctx, 1);
+
+ qcrypto_hash_alg_map[alg].init(hash->opaque);
+ return hash;
+}
+
+static
+void qcrypto_nettle_hash_free(QCryptoHash *hash)
+{
+ union qcrypto_hash_ctx *ctx = hash->opaque;
+
+ g_free(ctx);
+ g_free(hash);
+}
+
+static
+int qcrypto_nettle_hash_update(QCryptoHash *hash,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ union qcrypto_hash_ctx *ctx = hash->opaque;
+
+ for (int i = 0; i < niov; i++) {
+ /*
+ * Some versions of nettle have functions
+ * declared with 'int' instead of 'size_t'
+ * so to be safe avoid writing more than
+ * UINT_MAX bytes at a time
+ */
+ size_t len = iov[i].iov_len;
+ uint8_t *base = iov[i].iov_base;
+ while (len) {
+ size_t shortlen = MIN(len, UINT_MAX);
+ qcrypto_hash_alg_map[hash->alg].write(ctx, len, base);
+ len -= shortlen;
+ base += len;
+ }
+ }
+
+ return 0;
+}
+
+static
+int qcrypto_nettle_hash_finalize(QCryptoHash *hash,
+ uint8_t **result,
+ size_t *result_len,
+ Error **errp)
+{
+ union qcrypto_hash_ctx *ctx = hash->opaque;
+
+ *result_len = qcrypto_hash_alg_map[hash->alg].len;
+ *result = g_new(uint8_t, *result_len);
+
+ qcrypto_hash_alg_map[hash->alg].result(ctx, *result_len, *result);
+
+ return 0;
+}
QCryptoHashDriver qcrypto_hash_lib_driver = {
.hash_bytesv = qcrypto_nettle_hash_bytesv,
+ .hash_new = qcrypto_nettle_hash_new,
+ .hash_update = qcrypto_nettle_hash_update,
+ .hash_finalize = qcrypto_nettle_hash_finalize,
+ .hash_free = qcrypto_nettle_hash_free,
};
--
2.46.0
