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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| // Copyright 2024 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| #include <stdbool.h> | ||
| #include <stdint.h> | ||
| #include <stdio.h> | ||
| #include <string.h> | ||
|
|
||
| #include "host_commands.h" | ||
|
|
||
| struct ec_authorized_command_request authz_command_build_request( | ||
| uint64_t hardware_identity, uint32_t opcode, uint32_t key_info, | ||
| const uint32_t* nonce) { | ||
| struct ec_authorized_command_request request = { | ||
| .version = AUTHORIZED_COMMAND_VERSION, | ||
| .size = sizeof(request), | ||
| .key_info = key_info, | ||
| .dev_id_0 = hardware_identity & UINT32_C(0xffffffff), | ||
| .dev_id_1 = hardware_identity >> 32, | ||
| .opcode = opcode, | ||
| }; | ||
| memcpy(request.nonce, nonce, sizeof(request.nonce)); | ||
| return request; | ||
| } | ||
|
|
||
| void authz_command_print_request( | ||
| const struct ec_authorized_command_request* request) { | ||
| const uint8_t* out = (const uint8_t*)request; | ||
| for (int i = 0; i < sizeof(*request); i++) { | ||
| printf("%02x", out[i]); | ||
| } | ||
| printf("\n"); | ||
| } | ||
|
|
||
| static uint8_t parse_nibble(char c) { | ||
| if (c >= '0' && c <= '9') { | ||
| return c - '0'; | ||
| } | ||
| if (c >= 'a' && c <= 'f') { | ||
| return c - 'a' + 0xa; | ||
| } | ||
| if (c >= 'A' && c <= 'F') { | ||
| return c - 'A' + 0xa; | ||
| } | ||
| return UINT8_MAX; | ||
| } | ||
|
|
||
| int authz_command_hex_to_struct(const char* hexstring, | ||
| struct ec_authorized_command_request* request) { | ||
| size_t actual_len = strlen(hexstring); | ||
| size_t expected_len = 2 * sizeof(*request); | ||
| if (actual_len != expected_len) { | ||
| fprintf(stderr, "Bad hexstring length. Got %ld but expected %ld.\n", | ||
| actual_len, expected_len); | ||
| if (actual_len > expected_len) { | ||
| fprintf(stderr, "Note: command payloads are unsupported.\n"); | ||
| } | ||
| return -1; | ||
| } | ||
|
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| uint8_t* out = (uint8_t*)request; | ||
|
|
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| for (int i = 0; i < sizeof(*request); i++) { | ||
| uint8_t nibble_0 = parse_nibble(hexstring[2 * i]); | ||
| uint8_t nibble_1 = parse_nibble(hexstring[2 * i + 1]); | ||
| if (nibble_0 == UINT8_MAX || nibble_1 == UINT8_MAX) { | ||
| fprintf(stderr, "Invalid hex character at byte %d\n", i); | ||
| return -1; | ||
| } | ||
| out[i] = (nibble_0 << 4) | nibble_1; | ||
| } | ||
|
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| bool has_payload = request->size > sizeof(*request); | ||
| if (has_payload) { | ||
| uint32_t payload_size = request->size - sizeof(*request); | ||
| fprintf(stderr, | ||
| "Command payloads are unsupported. Request declares a payload of " | ||
| "size %d bytes.\n", | ||
| payload_size); | ||
| return -1; | ||
| } | ||
|
|
||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,40 @@ | ||
| // Copyright 2024 Google LLC | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| #ifndef LIBHOTH_EXAMPLES_AUTHZ_COMMAND_H_ | ||
| #define LIBHOTH_EXAMPLES_AUTHZ_COMMAND_H_ | ||
|
|
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| #include <stdint.h> | ||
|
|
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
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| struct ec_authorized_command_request; | ||
|
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| struct ec_authorized_command_request authz_command_build_request( | ||
| uint64_t hardware_identity, uint32_t opcode, uint32_t key_info, | ||
| const uint32_t* nonce); | ||
|
|
||
| void authz_command_print_request( | ||
| const struct ec_authorized_command_request* request); | ||
|
|
||
| int authz_command_hex_to_struct(const char* hexstring, | ||
| struct ec_authorized_command_request* out); | ||
|
|
||
| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
|
|
||
| #endif // LIBHOTH_EXAMPLES_AUTHZ_COMMAND_H_ |
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