1 files changed, 90 insertions, 0 deletions
diff --git a/crypto/asymmetric_keys/asym_tpm.c b/crypto/asymmetric_keys/asym_tpm.c
new file mode 100644
index 000000000000..d0b2b97e8e54
--- /dev/null
+++ b/crypto/asymmetric_keys/asym_tpm.c
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-2.0
+#define pr_fmt(fmt) "ASYM-TPM: "fmt
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/seq_file.h>
+#include <linux/scatterlist.h>
+#include <linux/tpm.h>
+#include <keys/asymmetric-subtype.h>
+#include <crypto/asym_tpm_subtype.h>
+
+/*
+ * Provide a part of a description of the key for /proc/keys.
+ */
+static void asym_tpm_describe(const struct key *asymmetric_key,
+			      struct seq_file *m)
+{
+	struct tpm_key *tk = asymmetric_key->payload.data[asym_crypto];
+
+	if (!tk)
+		return;
+
+	seq_printf(m, "TPM1.2/Blob");
+}
+
+static void asym_tpm_destroy(void *payload0, void *payload3)
+{
+	struct tpm_key *tk = payload0;
+
+	if (!tk)
+		return;
+
+	kfree(tk->blob);
+	tk->blob_len = 0;
+
+	kfree(tk);
+}
+
+/* Given the blob, parse it and load it into the TPM */
+struct tpm_key *tpm_key_create(const void *blob, uint32_t blob_len)
+{
+	int r;
+	struct tpm_key *tk;
+
+	r = tpm_is_tpm2(NULL);
+	if (r < 0)
+		goto error;
+
+	/* We don't support TPM2 yet */
+	if (r > 0) {
+		r = -ENODEV;
+		goto error;
+	}
+
+	r = -ENOMEM;
+	tk = kzalloc(sizeof(struct tpm_key), GFP_KERNEL);
+	if (!tk)
+		goto error;
+
+	tk->blob = kmemdup(blob, blob_len, GFP_KERNEL);
+	if (!tk->blob)
+		goto error_memdup;
+
+	tk->blob_len = blob_len;
+
+	return tk;
+
+error_memdup:
+	kfree(tk);
+error:
+	return ERR_PTR(r);
+}
+EXPORT_SYMBOL_GPL(tpm_key_create);
+
+/*
+ * TPM-based asymmetric key subtype
+ */
+struct asymmetric_key_subtype asym_tpm_subtype = {
+	.owner			= THIS_MODULE,
+	.name			= "asym_tpm",
+	.name_len		= sizeof("asym_tpm") - 1,
+	.describe		= asym_tpm_describe,
+	.destroy		= asym_tpm_destroy,
+};
+EXPORT_SYMBOL_GPL(asym_tpm_subtype);
+
+MODULE_DESCRIPTION("TPM based asymmetric key subtype");
+MODULE_AUTHOR("Intel Corporation");
+MODULE_LICENSE("GPL v2");