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Add message signing (may not work yet)
No tests for message signing, but everything else works as before.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| /******************************************************************************* | ||
| * (c) 2022 Vacuumlabs | ||
| * | ||
| * 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 "message.h" | ||
| #include "zxformat.h" | ||
| #include "app_mode.h" | ||
| #include "hdpath.h" | ||
| #include "crypto.h" | ||
| #include "buffering.h" | ||
|
|
||
| #define MAX_MESSAGE_SHOW_LENGTH 34 * 5 | ||
| #define MAX_MESSAGE_LENGTH 0x7FFF | ||
|
|
||
| struct { | ||
| uint8_t hash[CX_SHA256_SIZE]; | ||
| uint16_t length; | ||
| uint8_t *message; | ||
| bool canBeDisplayed; | ||
|
|
||
| } messageData; | ||
|
|
||
| zxerr_t message_parse() { | ||
| messageData.message = buffering_get_buffer()->data; | ||
| messageData.length = buffering_get_buffer()->pos; | ||
|
|
||
| if (messageData.length > MAX_MESSAGE_LENGTH) { | ||
| return zxerr_out_of_bounds; | ||
| } | ||
|
|
||
| for (size_t j = 0; j < messageData.length; j++) { | ||
| if (messageData.message[j] < 32 || messageData.message[j] > 127) { | ||
| return zxerr_out_of_bounds; | ||
| } | ||
| } | ||
|
|
||
| sha256(messageData.message, messageData.length, messageData.hash); | ||
| messageData.canBeDisplayed = false; | ||
|
|
||
| if (messageData.length <= MAX_MESSAGE_SHOW_LENGTH) { | ||
| messageData.canBeDisplayed = true; | ||
| } | ||
|
|
||
| return zxerr_ok; | ||
| } | ||
|
|
||
| zxerr_t message_getNumItems(uint8_t *num_items) { | ||
| *num_items = 2 + (!messageData.canBeDisplayed ? 1 : 0) + (app_mode_expert() ? 1 : 0); | ||
| return zxerr_ok; | ||
| } | ||
|
|
||
| // retrieves a readable output for each field / page | ||
| zxerr_t message_getItem(int8_t displayIdx, | ||
| char *outKey, | ||
| uint16_t outKeyLen, | ||
| char *outVal, | ||
| uint16_t outValLen, | ||
| uint8_t pageIdx, | ||
| uint8_t *pageCount) { | ||
| switch (displayIdx) { | ||
| case 0: | ||
| snprintf(outKey, outKeyLen, "Review"); | ||
| snprintf(outVal, outValLen, "the message to sign"); | ||
| return zxerr_ok; | ||
| case 1: | ||
| if (messageData.canBeDisplayed) { | ||
| snprintf(outKey, outKeyLen, "Message"); | ||
| pageStringExt(outVal, | ||
| outValLen, | ||
| (char *) messageData.message, | ||
| messageData.length, | ||
| pageIdx, | ||
| pageCount); | ||
| return zxerr_ok; | ||
| } else { | ||
| snprintf(outKey, outKeyLen, "Message too long,"); | ||
| snprintf(outVal, outValLen, "validate hash on a secure device."); | ||
| return zxerr_ok; | ||
| } | ||
| } | ||
|
|
||
| displayIdx -= 2; | ||
|
|
||
| if (displayIdx == 0 && !messageData.canBeDisplayed) { | ||
| snprintf(outKey, outKeyLen, "Message hash"); | ||
| pageStringHex(outVal, | ||
| outValLen, | ||
| (const char *) messageData.hash, | ||
| sizeof(messageData.hash), | ||
| pageIdx, | ||
| pageCount); | ||
| return zxerr_ok; | ||
| } | ||
|
|
||
| if (!messageData.canBeDisplayed) { | ||
| displayIdx -= 1; | ||
| } | ||
|
|
||
| if (displayIdx == 0 && app_mode_expert()) { | ||
| snprintf(outKey, outKeyLen, "Your Path"); | ||
| char buffer[100]; | ||
| path_options_to_string(buffer, | ||
| sizeof(buffer), | ||
| hdPath.data, | ||
| HDPATH_LEN_DEFAULT, | ||
| cryptoOptions); | ||
| pageString(outVal, outValLen, buffer, pageIdx, pageCount); | ||
| return zxerr_ok; | ||
| } | ||
|
|
||
| return zxerr_no_data; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,30 @@ | ||
| /******************************************************************************* | ||
| * (c) 2022 Vacuumlabs | ||
| * | ||
| * 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. | ||
| ********************************************************************************/ | ||
| #pragma once | ||
|
|
||
| #include "zxerror.h" | ||
|
|
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| zxerr_t message_parse(); | ||
|
|
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| zxerr_t message_getNumItems(uint8_t *num_items); | ||
|
|
||
| zxerr_t message_getItem(int8_t displayIdx, | ||
| char *outKey, | ||
| uint16_t outKeyLen, | ||
| char *outVal, | ||
| uint16_t outValLen, | ||
| uint8_t pageIdx, | ||
| uint8_t *pageCount); |
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