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crypto/hash-nettle: Implement new hash API

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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.zeise@seagate.com>
[ clg: - Dropped qcrypto_hash_supports() in qcrypto_nettle_hash_new() ]
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 09:57:12 +02:00 committed by Daniel P. Berrangé
parent f4f3d6663d
commit 278d596015
1 changed files with 70 additions and 0 deletions
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70
crypto/hash-nettle.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
@ -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,
};