tpm: migrate pubek_show to struct tpm_buf

#include <linux/device.h>

#include "tpm.h"

#define READ_PUBEK_RESULT_SIZE 314

struct tpm_readpubek_out {

	u8 algorithm[4];

	u8 encscheme[2];

	u8 sigscheme[2];

	__be32 paramsize;

	u8 parameters[12];

	__be32 keysize;

	u8 modulus[256];

	u8 checksum[20];

} __packed;

#define READ_PUBEK_RESULT_MIN_BODY_SIZE (28 + 256)

#define TPM_ORD_READPUBEK 124

static const struct tpm_input_header tpm_readpubek_header = {

	.tag = cpu_to_be16(TPM_TAG_RQU_COMMAND),

	.length = cpu_to_be32(30),

	.ordinal = cpu_to_be32(TPM_ORD_READPUBEK)

};

static ssize_t pubek_show(struct device *dev, struct device_attribute *attr,

			  char *buf)

{

	u8 *data;

	struct tpm_cmd_t tpm_cmd;

	ssize_t err;

	int i, rc;

	struct tpm_buf tpm_buf;

	struct tpm_readpubek_out *out;

	ssize_t rc;

	int i;

	char *str = buf;

	struct tpm_chip *chip = to_tpm_chip(dev);

	char anti_replay[20];

	memset(&tpm_cmd, 0, sizeof(tpm_cmd));

	memset(&anti_replay, 0, sizeof(anti_replay));

	rc = tpm_buf_init(&tpm_buf, TPM_TAG_RQU_COMMAND, TPM_ORD_READPUBEK);

	if (rc)

		return rc;

	tpm_cmd.header.in = tpm_readpubek_header;

	err = tpm_transmit_cmd(chip, NULL, &tpm_cmd, READ_PUBEK_RESULT_SIZE,

	tpm_buf_append(&tpm_buf, anti_replay, sizeof(anti_replay));

	rc = tpm_transmit_cmd(chip, NULL, tpm_buf.data, PAGE_SIZE,

			      READ_PUBEK_RESULT_MIN_BODY_SIZE, 0,

			      "attempting to read the PUBEK");

	if (err)

		goto out;

	if (rc) {

		tpm_buf_destroy(&tpm_buf);

		return 0;

	}

	/*

	   ignore header 10 bytes

	   algorithm 32 bits (1 == RSA )

	   encscheme 16 bits

	   sigscheme 16 bits

	   parameters (RSA 12->bytes: keybit, #primes, expbit)

	   keylenbytes 32 bits

	   256 byte modulus

	   ignore checksum 20 bytes

	 */

	data = tpm_cmd.params.readpubek_out_buffer;

	out = (struct tpm_readpubek_out *)&tpm_buf.data[10];

	str +=

	    sprintf(str,

		    "Algorithm: %02X %02X %02X %02X\n"

		    "%02X %02X %02X %02X\n"

		    "Modulus length: %d\n"

		    "Modulus:\n",

		    data[0], data[1], data[2], data[3],

		    data[4], data[5],

		    data[6], data[7],

		    data[12], data[13], data[14], data[15],

		    data[16], data[17], data[18], data[19],

		    data[20], data[21], data[22], data[23],

		    be32_to_cpu(*((__be32 *) (data + 24))));

		    out->algorithm[0], out->algorithm[1], out->algorithm[2],

		    out->algorithm[3],

		    out->encscheme[0], out->encscheme[1],

		    out->sigscheme[0], out->sigscheme[1],

		    out->parameters[0], out->parameters[1],

		    out->parameters[2], out->parameters[3],

		    out->parameters[4], out->parameters[5],

		    out->parameters[6], out->parameters[7],

		    out->parameters[8], out->parameters[9],

		    out->parameters[10], out->parameters[11],

		    be32_to_cpu(out->keysize));

	for (i = 0; i < 256; i++) {

		str += sprintf(str, "%02X ", data[i + 28]);

		str += sprintf(str, "%02X ", out->modulus[i]);

		if ((i + 1) % 16 == 0)

			str += sprintf(str, "\n");

	}

out:

	rc = str - buf;

	tpm_buf_destroy(&tpm_buf);

	return rc;

}

static DEVICE_ATTR_RO(pubek);

	TPM_CAP_PROP_TIS_DURATION = 0x120,

};

struct	tpm_readpubek_params_out {

	u8	algorithm[4];

	u8	encscheme[2];

	u8	sigscheme[2];

	__be32	paramsize;

	u8	parameters[12]; /*assuming RSA*/

	__be32	keysize;

	u8	modulus[256];

	u8	checksum[20];

} __packed;

typedef union {

	struct	tpm_input_header in;

	struct	tpm_output_header out;

} __packed;

typedef union {

	struct	tpm_readpubek_params_out readpubek_out;

	u8	readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];

	struct	tpm_pcrread_in	pcrread_in;

	struct	tpm_pcrread_out	pcrread_out;

	struct	tpm_getrandom_in getrandom_in;