Implements the new hashing API in the gcrypt 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>
---
crypto/hash-gcrypt.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 79 insertions(+)
diff --git a/crypto/hash-gcrypt.c b/crypto/hash-gcrypt.c
index 829e48258d..e05511cafa 100644
--- a/crypto/hash-gcrypt.c
+++ b/crypto/hash-gcrypt.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
@@ -110,7 +111,85 @@ qcrypto_gcrypt_hash_bytesv(QCryptoHashAlgorithm alg,
return -1;
}
+static
+QCryptoHash *qcrypto_gcrypt_hash_new(QCryptoHashAlgorithm alg, Error **errp)
+{
+ QCryptoHash *hash = NULL;
+
+ if (!qcrypto_hash_supports(alg)) {
+ error_setg(errp,
+ "Unknown hash algorithm %d",
+ alg);
+ } else {
+ hash = g_new(QCryptoHash, 1);
+ hash->alg = alg;
+ hash->opaque = g_new(gcry_md_hd_t, 1);
+
+ gcry_md_open((gcry_md_hd_t *) hash->opaque, qcrypto_hash_alg_map[alg],
0);
+ }
+
+ return hash;
+}
+
+static
+void qcrypto_gcrypt_hash_free(QCryptoHash *hash)
+{
+ gcry_md_hd_t *ctx = hash->opaque;
+
+ if (ctx) {
+ gcry_md_close(*ctx);
+ g_free(ctx);
+ }
+
+ g_free(hash);
+}
+
+
+static
+int qcrypto_gcrypt_hash_update(QCryptoHash *hash,
+ const struct iovec *iov,
+ size_t niov,
+ Error **errp)
+{
+ gcry_md_hd_t *ctx = hash->opaque;
+
+ for (int i = 0; i < niov; i++) {
+ gcry_md_write(*ctx, iov[i].iov_base, iov[i].iov_len);
+ }
+
+ return 0;
+}
+
+static
+int qcrypto_gcrypt_hash_finalize(QCryptoHash *hash,
+ uint8_t **result,
+ size_t *result_len,
+ Error **errp)
+{
+ unsigned char *digest;
+ int ret = 0;
+ gcry_md_hd_t *ctx = hash->opaque;
+
+ *result_len = gcry_md_get_algo_dlen(qcrypto_hash_alg_map[hash->alg]);
+ if (*result_len == 0) {
+ error_setg(errp, "%s",
+ "Unable to get hash length");
+ ret = -1;
+ } else {
+ *result = g_new(uint8_t, *result_len);
+
+ /* Digest is freed by gcry_md_close(), copy it */
+ digest = gcry_md_read(*ctx, 0);
+ memcpy(*result, digest, *result_len);
+ }
+
+ return ret;
+}
QCryptoHashDriver qcrypto_hash_lib_driver = {
.hash_bytesv = qcrypto_gcrypt_hash_bytesv,
+ .hash_new = qcrypto_gcrypt_hash_new,
+ .hash_update = qcrypto_gcrypt_hash_update,
+ .hash_finalize = qcrypto_gcrypt_hash_finalize,
+ .hash_free = qcrypto_gcrypt_hash_free,
};
--
2.34.1
