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- Factored out seed operations - Added unit tests for seed module - Removed unused parameters from unlock and pin modules
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| /** | ||
| * The MIT License (MIT) | ||
| * | ||
| * Copyright (c) 2021 RSK Labs Ltd | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to | ||
| * deal in the Software without restriction, including without limitation the | ||
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
| * IN THE SOFTWARE. | ||
| */ | ||
|
|
||
| #include <string.h> | ||
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| #include "apdu.h" | ||
| #include "defs.h" | ||
| #include "err.h" | ||
| #include "os.h" | ||
| #include "seed.h" | ||
|
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||
| /* | ||
| * Init the given seed context to point to a target buffer | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| * @arg[in] words_buffer pointer to the words buffer | ||
| * @arg[in] words_buffer_size words_buffer size in bytes | ||
| * @arg[in] seed_buffer pointer to the seed buffer | ||
| * @arg[in] seed_buffer_size seed_buffer size in bytes | ||
| */ | ||
| void init_seed_ctx(seed_t* seed_ctx, | ||
| char* words_buffer, | ||
| size_t words_buffer_size, | ||
| char* seed_buffer, | ||
| size_t seed_buffer_size, | ||
| mnemonic_from_data_callback_t callback) { | ||
| seed_ctx->words_buffer = words_buffer; | ||
| seed_ctx->words_buffer_size = words_buffer_size; | ||
| seed_ctx->seed_buffer = seed_buffer; | ||
| seed_ctx->seed_buffer_size = seed_buffer_size; | ||
| seed_ctx->mnemonic_from_data_callback = callback; | ||
| } | ||
|
|
||
| /* | ||
| * Reset the given seed context | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| */ | ||
| void reset_seed_ctx(seed_t* seed_ctx) { | ||
| explicit_bzero(seed_ctx, sizeof(seed_t)); | ||
| } | ||
|
|
||
| /* | ||
| * Generates the mnemonic from an initial seed. The seed should be in | ||
| * words_buffer before calling this function. The mnemonic will be saved | ||
| * on words_buffer and words_buffer_size will be set accordingly | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| */ | ||
| void generate_mnemonic(seed_t* seed_ctx) { | ||
| volatile int i; | ||
| // Generate 32 bytes of random with onboard rng | ||
| cx_rng((unsigned char*)seed_ctx->seed_buffer, HASHSIZE); | ||
| // XOR with host-generated 32 bytes random | ||
| for (i = 0; i < HASHSIZE; i++) { | ||
| seed_ctx->seed_buffer[i] ^= seed_ctx->words_buffer[i]; | ||
| } | ||
| // The seed is now in seed_buffer, generate the mnemonic | ||
| os_memset(seed_ctx->words_buffer, 0, seed_ctx->seed_buffer_size); | ||
| seed_ctx->words_buffer_size = seed_ctx->mnemonic_from_data_callback( | ||
| (unsigned char*)seed_ctx->seed_buffer, | ||
| SEEDSIZE, | ||
| (unsigned char*)seed_ctx->words_buffer, | ||
| seed_ctx->words_buffer_size); | ||
| // Clear the seed | ||
| explicit_bzero(seed_ctx->seed_buffer, seed_ctx->seed_buffer_size); | ||
| } | ||
|
|
||
| /* | ||
| * Wipes the contents of words_buffer | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| */ | ||
| void clear_mnemonic(seed_t* seed_ctx) { | ||
| explicit_bzero(seed_ctx->words_buffer, seed_ctx->words_buffer_size); | ||
| } | ||
|
|
||
| /* | ||
| * Implement the RSK SEED command. | ||
| * | ||
| * Receives one byte at a time and fills words_buffer in seed_ctx. | ||
| * | ||
| * @arg[in] rx number of received bytes from the Host | ||
| * @arg[out] seed_ctx seed context | ||
| * @ret number of transmited bytes to the host | ||
| */ | ||
| unsigned int update_words_buffer(volatile unsigned int rx, seed_t* seed_ctx) { | ||
| // Should receive 1 byte per call | ||
| if (APDU_DATA_SIZE(rx) != 1) { | ||
| THROW(PROT_INVALID); | ||
| } | ||
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| unsigned char index = APDU_OP(); | ||
| if ((index >= 0) && ((size_t)index <= seed_ctx->words_buffer_size)) { | ||
| seed_ctx->words_buffer[index] = APDU_AT(3); | ||
| } | ||
|
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| // No bytes transmited to host | ||
| return 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,91 @@ | ||
| /** | ||
| * The MIT License (MIT) | ||
| * | ||
| * Copyright (c) 2021 RSK Labs Ltd | ||
| * | ||
| * Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| * of this software and associated documentation files (the "Software"), to | ||
| * deal in the Software without restriction, including without limitation the | ||
| * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | ||
| * sell copies of the Software, and to permit persons to whom the Software is | ||
| * furnished to do so, subject to the following conditions: | ||
| * | ||
| * The above copyright notice and this permission notice shall be included in | ||
| * all copies or substantial portions of the Software. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | ||
| * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | ||
| * IN THE SOFTWARE. | ||
| */ | ||
|
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| #ifndef __SEED | ||
| #define __SEED | ||
|
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| typedef unsigned int (*mnemonic_from_data_callback_t)(unsigned char* in, | ||
| unsigned int in_length, | ||
| unsigned char* out, | ||
| unsigned int out_length); | ||
|
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| // Seed context | ||
| typedef struct { | ||
| // Buffer used to hold the initial seed and the generated mnemominc | ||
| char* words_buffer; | ||
| // words_buffer size in bytes | ||
| size_t words_buffer_size; | ||
| // Temporary buffer used in seed generation | ||
| char* seed_buffer; | ||
| // seed_buffer size in bytes | ||
| size_t seed_buffer_size; | ||
| // callback function for mnemonic generation | ||
| mnemonic_from_data_callback_t mnemonic_from_data_callback; | ||
| } seed_t; | ||
|
|
||
| /* | ||
| * Init the given seed context to point to a target buffer | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| * @arg[in] words_buffer pointer to the words buffer | ||
| * @arg[in] words_buffer_size words_buffer size in bytes | ||
| * @arg[in] seed_buffer pointer to the seed buffer | ||
| * @arg[in] seed_buffer_size seed_buffer size in bytes | ||
| */ | ||
| void init_seed_ctx(seed_t* seed_ctx, | ||
| char* words_buffer, | ||
| size_t words_buffer_size, | ||
| char* string_buffer, | ||
| size_t string_buffer_size, | ||
| mnemonic_from_data_callback_t callback); | ||
|
|
||
| /* | ||
| * Reset the given seed context | ||
| * | ||
| * @arg[in] seed_ctx seed context | ||
| */ | ||
| void reset_seed_ctx(seed_t* seed_ctx); | ||
|
|
||
| /* | ||
| * Generates the mnemonic from an initial seed. The seed should be in | ||
| * words_buffer before calling this function. The mnemonic will be saved | ||
| * on words_buffer and words_buffer_size will be set accordingly | ||
| * | ||
| * @arg[out] seed_ctx seed context | ||
| */ | ||
| void generate_mnemonic(seed_t* seed_ctx); | ||
| void clear_mnemonic(seed_t* seed_ctx); | ||
|
|
||
| /* | ||
| * Implement the RSK SEED command. | ||
| * | ||
| * Receives one byte at a time and fills words_buffer in seed_ctx. | ||
| * | ||
| * @arg[in] rx number of received bytes from the Host | ||
| * @arg[out] seed_ctx seed context | ||
| * @ret number of transmited bytes to the host | ||
| */ | ||
| unsigned int update_words_buffer(volatile unsigned int rx, seed_t* seed_ctx); | ||
|
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| #endif |
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