1 // SPDX-License-Identifier: GPL-2.0+
4 * Mario Six, Guntermann & Drunck GmbH, mario.six@gdsys.cc
10 #include <linux/ctype.h>
11 #include <asm/unaligned.h>
23 /* fetch list of already loaded keys in the TPM */
24 err = tpm_get_capability(TPM_CAP_HANDLE, TPM_RT_KEY, buf, sizeof(buf));
27 key_count = get_unaligned_be16(buf);
29 for (i = 0; i < key_count; ++i, ptr += 4) {
30 err = tpm_flush_specific(get_unaligned_be32(ptr), TPM_RT_KEY);
31 if (err && err != TPM_KEY_OWNER_CONTROL)
38 int decode_hexstr(char *hexstr, u8 **result)
40 int len = strlen(hexstr);
48 *result = (u8 *)malloc(bytes);
50 for (i = 0; i < len; i++) {
51 char cur = tolower(hexstr[i]);
54 if ((cur >= 'a' && cur <= 'f') || (cur >= '0' && cur <= '9')) {
55 val = cur - (cur > '9' ? 87 : 48);
60 (*result)[i / 2] = acc + val;
70 int extract_subprogram(u8 **progdata, u32 expected_magic,
71 struct key_program **result)
73 struct key_program *prog = *result;
74 u32 magic, code_crc, code_size;
76 magic = get_unaligned_be32(*progdata);
77 code_crc = get_unaligned_be32(*progdata + 4);
78 code_size = get_unaligned_be32(*progdata + 8);
82 if (magic != expected_magic)
85 *result = malloc(sizeof(struct key_program) + code_size);
91 prog->code_crc = code_crc;
92 prog->code_size = code_size;
93 memcpy(prog->code, *progdata, code_size);
95 *progdata += code_size;
97 if (hre_verify_program(prog)) {
105 struct key_program *parse_and_check_keyprog(u8 *progdata)
107 struct key_program *result = NULL, *hmac = NULL;
109 /* Part 1: Load key program */
111 if (extract_subprogram(&progdata, MAGIC_KEY_PROGRAM, &result))
114 /* Part 2: Load hmac program */
116 if (extract_subprogram(&progdata, MAGIC_HMAC, &hmac))
124 int load_and_run_keyprog(void)
129 struct key_program *prog;
131 cmd = env_get("loadkeyprogram");
133 if (!cmd || run_command(cmd, 0))
136 hexprog = env_get("keyprogram");
138 if (decode_hexstr(hexprog, &binprog))
141 prog = parse_and_check_keyprog(binprog);
147 if (hre_run_program(prog->code, prog->code_size)) {
152 printf("\nSD code ran successfully\n");