91 lines
1.7 KiB
C
91 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#define pr_fmt(fmt) "ASYM-TPM: "fmt
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#include <linux/slab.h>
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#include <linux/module.h>
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#include <linux/export.h>
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#include <linux/kernel.h>
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#include <linux/seq_file.h>
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#include <linux/scatterlist.h>
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#include <linux/tpm.h>
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#include <keys/asymmetric-subtype.h>
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#include <crypto/asym_tpm_subtype.h>
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/*
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* Provide a part of a description of the key for /proc/keys.
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*/
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static void asym_tpm_describe(const struct key *asymmetric_key,
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struct seq_file *m)
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{
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struct tpm_key *tk = asymmetric_key->payload.data[asym_crypto];
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if (!tk)
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return;
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seq_printf(m, "TPM1.2/Blob");
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}
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static void asym_tpm_destroy(void *payload0, void *payload3)
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{
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struct tpm_key *tk = payload0;
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if (!tk)
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return;
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kfree(tk->blob);
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tk->blob_len = 0;
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kfree(tk);
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}
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/* Given the blob, parse it and load it into the TPM */
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struct tpm_key *tpm_key_create(const void *blob, uint32_t blob_len)
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{
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int r;
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struct tpm_key *tk;
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r = tpm_is_tpm2(NULL);
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if (r < 0)
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goto error;
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/* We don't support TPM2 yet */
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if (r > 0) {
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r = -ENODEV;
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goto error;
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}
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r = -ENOMEM;
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tk = kzalloc(sizeof(struct tpm_key), GFP_KERNEL);
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if (!tk)
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goto error;
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tk->blob = kmemdup(blob, blob_len, GFP_KERNEL);
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if (!tk->blob)
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goto error_memdup;
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tk->blob_len = blob_len;
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return tk;
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error_memdup:
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kfree(tk);
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error:
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return ERR_PTR(r);
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}
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EXPORT_SYMBOL_GPL(tpm_key_create);
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/*
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* TPM-based asymmetric key subtype
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*/
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struct asymmetric_key_subtype asym_tpm_subtype = {
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.owner = THIS_MODULE,
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.name = "asym_tpm",
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.name_len = sizeof("asym_tpm") - 1,
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.describe = asym_tpm_describe,
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.destroy = asym_tpm_destroy,
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};
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EXPORT_SYMBOL_GPL(asym_tpm_subtype);
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MODULE_DESCRIPTION("TPM based asymmetric key subtype");
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MODULE_AUTHOR("Intel Corporation");
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MODULE_LICENSE("GPL v2");
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