3  * CZ.NIC's Turris Omnia MCU ECDSA message signing via keyctl
20 #include <linux/turris-omnia-mcu-interface.h>
22 #include "turris-omnia-mcu.h"
27 	struct omnia_mcu *mcu = dev_id;  in omnia_msg_signed_irq_handler()  local
30 	err = omnia_cmd_read(mcu->client, OMNIA_CMD_CRYPTO_COLLECT_SIGNATURE,  in omnia_msg_signed_irq_handler()
35 	guard(mutex)(&mcu->sign_lock);  in omnia_msg_signed_irq_handler()
37 	if (mcu->sign_requested) {  in omnia_msg_signed_irq_handler()
38 		mcu->sign_err = err;  in omnia_msg_signed_irq_handler()
40 			memcpy(mcu->signature, &reply[1],  in omnia_msg_signed_irq_handler()
42 		mcu->sign_requested = false;  in omnia_msg_signed_irq_handler()
43 		complete(&mcu->msg_signed);  in omnia_msg_signed_irq_handler()
52 	struct omnia_mcu *mcu = dev_get_drvdata(turris_signing_key_get_dev(key));  in omnia_mcu_sign()  local
56 	scoped_guard(mutex, &mcu->sign_lock) {  in omnia_mcu_sign()
57 		if (mcu->sign_requested)  in omnia_mcu_sign()
63 		err = omnia_cmd_write_read(mcu->client, cmd, sizeof(cmd),  in omnia_mcu_sign()
71 		mcu->sign_requested = true;  in omnia_mcu_sign()
74 	if (wait_for_completion_interruptible(&mcu->msg_signed))  in omnia_mcu_sign()
77 	guard(mutex)(&mcu->sign_lock);  in omnia_mcu_sign()
79 	if (mcu->sign_err)  in omnia_mcu_sign()
80 		return mcu->sign_err;  in omnia_mcu_sign()
82 	memcpy(signature, mcu->signature, OMNIA_MCU_CRYPTO_SIGNATURE_LEN);  in omnia_mcu_sign()
85 	memzero_explicit(mcu->signature, sizeof(mcu->signature));  in omnia_mcu_sign()
92 	struct omnia_mcu *mcu = dev_get_drvdata(turris_signing_key_get_dev(key));  in omnia_mcu_get_public_key()  local
94 	return mcu->board_public_key;  in omnia_mcu_get_public_key()
107 static int omnia_mcu_read_public_key(struct omnia_mcu *mcu)  in omnia_mcu_read_public_key()  argument
112 	err = omnia_cmd_read(mcu->client, OMNIA_CMD_CRYPTO_GET_PUBLIC_KEY,  in omnia_mcu_read_public_key()
120 	memcpy(mcu->board_public_key, &reply[1],  in omnia_mcu_read_public_key()
126 int omnia_mcu_register_keyctl(struct omnia_mcu *mcu)  in omnia_mcu_register_keyctl()  argument
128 	struct device *dev = &mcu->client->dev;  in omnia_mcu_register_keyctl()
132 	if (!(mcu->features & OMNIA_FEAT_CRYPTO))  in omnia_mcu_register_keyctl()
135 	err = omnia_mcu_read_public_key(mcu);  in omnia_mcu_register_keyctl()
140 	err = devm_mutex_init(dev, &mcu->sign_lock);  in omnia_mcu_register_keyctl()
144 	init_completion(&mcu->msg_signed);  in omnia_mcu_register_keyctl()
146 	err = omnia_mcu_request_irq(mcu, OMNIA_INT_MESSAGE_SIGNED,  in omnia_mcu_register_keyctl()
148 				    "turris-omnia-mcu-keyctl");  in omnia_mcu_register_keyctl()
153 	sprintf(desc, "Turris Omnia SN %016llX MCU ECDSA key",  in omnia_mcu_register_keyctl()
154 		mcu->board_serial_number);  in omnia_mcu_register_keyctl()