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crypto/hash-gcrypt: Implement new hash API

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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.zeise@seagate.com>
[ clg: - Dropped qcrypto_hash_supports() in qcrypto_gcrypt_hash_new()
       - Reworked qcrypto_gcrypt_hash_finalize()
       - Handled gcry_md_open() errors in qcrypto_gcrypt_hash_new()
       - Checkpatch fixes ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Alejandro Zeise 2024-10-08 09:57:10 +02:00 committed by Daniel P. Berrangé
parent c6ccd2af60
commit 4fd0a730d7
1 changed files with 79 additions and 0 deletions
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79
crypto/hash-gcrypt.c
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@ -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(QCryptoHashAlgo alg,
return -1;
}
static
QCryptoHash *qcrypto_gcrypt_hash_new(QCryptoHashAlgo alg, Error **errp)
{
QCryptoHash *hash;
int ret;
hash = g_new(QCryptoHash, 1);
hash->alg = alg;
hash->opaque = g_new(gcry_md_hd_t, 1);
ret = gcry_md_open((gcry_md_hd_t *) hash->opaque,
qcrypto_hash_alg_map[alg], 0);
if (ret < 0) {
error_setg(errp,
"Unable to initialize hash algorithm: %s",
gcry_strerror(ret));
g_free(hash->opaque);
g_free(hash);
return NULL;
}
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;
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, "Unable to get hash length");
return -1;
}
*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 0;
}
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,
};