81 lines
1.8 KiB
C
81 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2021 Pengutronix, Ahmad Fatoum <kernel@pengutronix.de>
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*/
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#include <keys/trusted_caam.h>
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#include <keys/trusted-type.h>
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#include <linux/build_bug.h>
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#include <linux/key-type.h>
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#include <soc/fsl/caam-blob.h>
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static struct caam_blob_priv *blobifier;
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#define KEYMOD "SECURE_KEY"
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static_assert(MAX_KEY_SIZE + CAAM_BLOB_OVERHEAD <= CAAM_BLOB_MAX_LEN);
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static_assert(MAX_BLOB_SIZE <= CAAM_BLOB_MAX_LEN);
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static int trusted_caam_seal(struct trusted_key_payload *p, char *datablob)
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{
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int ret;
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struct caam_blob_info info = {
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.input = p->key, .input_len = p->key_len,
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.output = p->blob, .output_len = MAX_BLOB_SIZE,
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.key_mod = KEYMOD, .key_mod_len = sizeof(KEYMOD) - 1,
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};
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ret = caam_encap_blob(blobifier, &info);
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if (ret)
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return ret;
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p->blob_len = info.output_len;
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return 0;
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}
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static int trusted_caam_unseal(struct trusted_key_payload *p, char *datablob)
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{
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int ret;
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struct caam_blob_info info = {
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.input = p->blob, .input_len = p->blob_len,
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.output = p->key, .output_len = MAX_KEY_SIZE,
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.key_mod = KEYMOD, .key_mod_len = sizeof(KEYMOD) - 1,
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};
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ret = caam_decap_blob(blobifier, &info);
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if (ret)
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return ret;
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p->key_len = info.output_len;
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return 0;
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}
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static int trusted_caam_init(void)
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{
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int ret;
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blobifier = caam_blob_gen_init();
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if (IS_ERR(blobifier))
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return PTR_ERR(blobifier);
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ret = register_key_type(&key_type_trusted);
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if (ret)
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caam_blob_gen_exit(blobifier);
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return ret;
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}
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static void trusted_caam_exit(void)
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{
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unregister_key_type(&key_type_trusted);
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caam_blob_gen_exit(blobifier);
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}
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struct trusted_key_ops trusted_key_caam_ops = {
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.migratable = 0, /* non-migratable */
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.init = trusted_caam_init,
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.seal = trusted_caam_seal,
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.unseal = trusted_caam_unseal,
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.exit = trusted_caam_exit,
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};
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