diff options
Diffstat (limited to 'crypto/asymmetric_keys/tpm_parser.c')
-rw-r--r-- | crypto/asymmetric_keys/tpm_parser.c | 102 |
1 files changed, 0 insertions, 102 deletions
diff --git a/crypto/asymmetric_keys/tpm_parser.c b/crypto/asymmetric_keys/tpm_parser.c deleted file mode 100644 index 96405d8dcd98..000000000000 --- a/crypto/asymmetric_keys/tpm_parser.c +++ /dev/null @@ -1,102 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -#define pr_fmt(fmt) "TPM-PARSER: "fmt -#include <linux/module.h> -#include <linux/kernel.h> -#include <linux/export.h> -#include <linux/slab.h> -#include <linux/err.h> -#include <keys/asymmetric-subtype.h> -#include <keys/asymmetric-parser.h> -#include <crypto/asym_tpm_subtype.h> -#include "tpm.asn1.h" - -struct tpm_parse_context { - const void *blob; - u32 blob_len; -}; - -/* - * Note the key data of the ASN.1 blob. - */ -int tpm_note_key(void *context, size_t hdrlen, - unsigned char tag, - const void *value, size_t vlen) -{ - struct tpm_parse_context *ctx = context; - - ctx->blob = value; - ctx->blob_len = vlen; - - return 0; -} - -/* - * Parse a TPM-encrypted private key blob. - */ -static struct tpm_key *tpm_parse(const void *data, size_t datalen) -{ - struct tpm_parse_context ctx; - long ret; - - memset(&ctx, 0, sizeof(ctx)); - - /* Attempt to decode the private key */ - ret = asn1_ber_decoder(&tpm_decoder, &ctx, data, datalen); - if (ret < 0) - goto error; - - return tpm_key_create(ctx.blob, ctx.blob_len); - -error: - return ERR_PTR(ret); -} -/* - * Attempt to parse a data blob for a key as a TPM private key blob. - */ -static int tpm_key_preparse(struct key_preparsed_payload *prep) -{ - struct tpm_key *tk; - - /* - * TPM 1.2 keys are max 2048 bits long, so assume the blob is no - * more than 4x that - */ - if (prep->datalen > 256 * 4) - return -EMSGSIZE; - - tk = tpm_parse(prep->data, prep->datalen); - - if (IS_ERR(tk)) - return PTR_ERR(tk); - - /* We're pinning the module by being linked against it */ - __module_get(asym_tpm_subtype.owner); - prep->payload.data[asym_subtype] = &asym_tpm_subtype; - prep->payload.data[asym_key_ids] = NULL; - prep->payload.data[asym_crypto] = tk; - prep->payload.data[asym_auth] = NULL; - prep->quotalen = 100; - return 0; -} - -static struct asymmetric_key_parser tpm_key_parser = { - .owner = THIS_MODULE, - .name = "tpm_parser", - .parse = tpm_key_preparse, -}; - -static int __init tpm_key_init(void) -{ - return register_asymmetric_key_parser(&tpm_key_parser); -} - -static void __exit tpm_key_exit(void) -{ - unregister_asymmetric_key_parser(&tpm_key_parser); -} - -module_init(tpm_key_init); -module_exit(tpm_key_exit); - -MODULE_DESCRIPTION("TPM private key-blob parser"); -MODULE_LICENSE("GPL v2"); |