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78 lines
2.1 KiB
78 lines
2.1 KiB
4 months ago
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/* Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*
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* Key unpacking functions
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*/
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#include "2sysincludes.h"
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#include "2rsa.h"
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#include "vb2_common.h"
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const uint8_t *vb2_packed_key_data(const struct vb2_packed_key *key)
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{
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return (const uint8_t *)key + key->key_offset;
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}
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int vb2_verify_packed_key_inside(const void *parent,
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uint32_t parent_size,
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const struct vb2_packed_key *key)
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{
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return vb2_verify_member_inside(parent, parent_size,
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key, sizeof(*key),
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key->key_offset, key->key_size);
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}
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int vb2_unpack_key(struct vb2_public_key *key,
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const uint8_t *buf,
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uint32_t size)
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{
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const struct vb2_packed_key *packed_key =
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(const struct vb2_packed_key *)buf;
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const uint32_t *buf32;
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uint32_t expected_key_size;
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int rv;
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/* Make sure passed buffer is big enough for the packed key */
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rv = vb2_verify_packed_key_inside(buf, size, packed_key);
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if (rv)
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return rv;
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/* Unpack key algorithm */
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key->sig_alg = vb2_crypto_to_signature(packed_key->algorithm);
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if (key->sig_alg == VB2_SIG_INVALID) {
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VB2_DEBUG("Unsupported signature algorithm.\n");
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return VB2_ERROR_UNPACK_KEY_SIG_ALGORITHM;
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}
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key->hash_alg = vb2_crypto_to_hash(packed_key->algorithm);
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if (key->hash_alg == VB2_HASH_INVALID) {
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VB2_DEBUG("Unsupported hash algorithm.\n");
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return VB2_ERROR_UNPACK_KEY_HASH_ALGORITHM;
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}
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expected_key_size = vb2_packed_key_size(key->sig_alg);
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if (!expected_key_size || expected_key_size != packed_key->key_size) {
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VB2_DEBUG("Wrong key size for algorithm\n");
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return VB2_ERROR_UNPACK_KEY_SIZE;
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}
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/* Make sure source buffer is 32-bit aligned */
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buf32 = (const uint32_t *)vb2_packed_key_data(packed_key);
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if (!vb2_aligned(buf32, sizeof(uint32_t)))
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return VB2_ERROR_UNPACK_KEY_ALIGN;
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/* Sanity check key array size */
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key->arrsize = buf32[0];
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if (key->arrsize * sizeof(uint32_t) != vb2_rsa_sig_size(key->sig_alg))
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return VB2_ERROR_UNPACK_KEY_ARRAY_SIZE;
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key->n0inv = buf32[1];
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/* Arrays point inside the key data */
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key->n = buf32 + 2;
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key->rr = buf32 + 2 + key->arrsize;
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return VB2_SUCCESS;
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}
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