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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,50 @@ | ||
| /**************************************************************************** | ||
| * | ||
| * Copyright (c) 2024 IMProject Development Team. All rights reserved. | ||
| * Authors: Igor Misic <[email protected]> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * 3. Neither the name IMProject nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software | ||
| * without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| #ifndef UTILITY_CHACHA20_H_ | ||
| #define UTILITY_CHACHA20_H_ | ||
|
|
||
| #include "typedefs.h" | ||
|
|
||
| #define CHACHA20_KEY_SIZE 32U | ||
| #define CHACHA20_NONCE_SIZE 12U | ||
|
|
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| void chacha20(const byte_t* plaintext, | ||
| uint32_t plaintext_len, | ||
| const byte_t key[CHACHA20_KEY_SIZE], | ||
| const byte_t nonce[CHACHA20_NONCE_SIZE], | ||
| uint32_t inc, | ||
| byte_t* encrypted_message); | ||
|
|
||
| #endif /* UTILITY_CHACHA20_H_ */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| /**************************************************************************** | ||
| * | ||
| * Copyright (c) 2023 IMProject Development Team. All rights reserved. | ||
| * Copyright (c) 2023 - 2024 IMProject Development Team. All rights reserved. | ||
| * Authors: Juraj Ciberlin <[email protected]> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
|
|
@@ -103,3 +103,14 @@ BitManipulation_toggleBit(uint32_t data, uint8_t n, uint32_t* out) { | |
| } | ||
| return status; | ||
| } | ||
|
|
||
| uint32_t | ||
| BitManipulation_rotl32(uint32_t data, uint32_t n_bits) { | ||
|
|
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| uint32_t n_bits_tmp = n_bits; | ||
| if (n_bits > 32U) { | ||
| n_bits_tmp = n_bits % 32U; | ||
| } | ||
| /* -E> compliant MC3R1.R12.2 1 Right and left-hand operands of shift expression are between 0 and 31 due to the previous IF statement. */ | ||
| return ((data << n_bits_tmp) ^ (data >> (32U - n_bits_tmp))); | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,174 @@ | ||
| /**************************************************************************** | ||
| * | ||
| * Copyright (c) 2024 IMProject Development Team. All rights reserved. | ||
| * Authors: Igor Misic <[email protected]> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * 3. Neither the name IMProject nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software | ||
| * without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| // Chacha20 definition document : https://datatracker.ietf.org/doc/html/rfc8439 | ||
|
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| #include "chacha20.h" | ||
|
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| #include "bit_manipulation.h" | ||
| #include "utils.h" | ||
|
|
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| #define KEY_STREAM_SIZE 64U | ||
| #define BLOCK_SIZE 64U | ||
|
|
||
| // Hex representation of Magic number: "expand 32-byte k" | ||
| #define CHACHA_MAGIC_NUMBER_PART_1 (0x61707865U) | ||
| #define CHACHA_MAGIC_NUMBER_PART_2 (0x3320646eU) | ||
| #define CHACHA_MAGIC_NUMBER_PART_3 (0x79622d32U) | ||
| #define CHACHA_MAGIC_NUMBER_PART_4 (0x6b206574U) | ||
|
|
||
| #define ARRAY_64_ZERO_VALUES { \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U, \ | ||
| 0U, 0U, 0U, 0U, 0U, 0U, 0U, 0U \ | ||
| } | ||
|
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||
| static inline void quarterround(uint32_t* a, uint32_t* b, uint32_t* c, uint32_t* d); | ||
| static void chacha20_block(const byte_t key[CHACHA20_KEY_SIZE], const uint32_t counter, | ||
| const byte_t nonce[CHACHA20_NONCE_SIZE], | ||
| byte_t out[KEY_STREAM_SIZE]); | ||
|
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| static inline void | ||
| quarterround(uint32_t* a, uint32_t* b, uint32_t* c, uint32_t* d) { | ||
| *a += *b; | ||
| *d = BitManipulation_rotl32(*d ^ *a, 16); | ||
| *c += *d; | ||
| *b = BitManipulation_rotl32(*b ^ *c, 12); | ||
| *a += *b; | ||
| *d = BitManipulation_rotl32(*d ^ *a, 8); | ||
| *c += *d; | ||
| *b = BitManipulation_rotl32(*b ^ *c, 7); | ||
| } | ||
|
|
||
| static void | ||
| chacha20_block(const byte_t key[CHACHA20_KEY_SIZE], const uint32_t counter, const byte_t nonce[CHACHA20_NONCE_SIZE], | ||
| byte_t out[KEY_STREAM_SIZE]) { | ||
|
|
||
| uint32_t x0 = CHACHA_MAGIC_NUMBER_PART_1; | ||
| uint32_t x1 = CHACHA_MAGIC_NUMBER_PART_2; | ||
| uint32_t x2 = CHACHA_MAGIC_NUMBER_PART_3; | ||
| uint32_t x3 = CHACHA_MAGIC_NUMBER_PART_4; | ||
| uint32_t x4 = Utils_Deserialize32LE((uint8_t*)&key[0]); | ||
| uint32_t x5 = Utils_Deserialize32LE((uint8_t*)&key[4]); | ||
| uint32_t x6 = Utils_Deserialize32LE((uint8_t*)&key[8]); | ||
| uint32_t x7 = Utils_Deserialize32LE((uint8_t*)&key[12]); | ||
| uint32_t x8 = Utils_Deserialize32LE((uint8_t*)&key[16]); | ||
| uint32_t x9 = Utils_Deserialize32LE((uint8_t*)&key[20]); | ||
| uint32_t x10 = Utils_Deserialize32LE((uint8_t*)&key[24]); | ||
| uint32_t x11 = Utils_Deserialize32LE((uint8_t*)&key[28]); | ||
| uint32_t x12 = counter; | ||
| uint32_t x13 = Utils_Deserialize32LE((uint8_t*)&nonce[0]); | ||
| uint32_t x14 = Utils_Deserialize32LE((uint8_t*)&nonce[4]); | ||
| uint32_t x15 = Utils_Deserialize32LE((uint8_t*)&nonce[8]); | ||
|
|
||
| for (uint8_t i = 0; i < 10U; ++i) { | ||
| quarterround(&x0, &x4, &x8, &x12); | ||
| quarterround(&x1, &x5, &x9, &x13); | ||
| quarterround(&x2, &x6, &x10, &x14); | ||
| quarterround(&x3, &x7, &x11, &x15); | ||
| quarterround(&x0, &x5, &x10, &x15); | ||
| quarterround(&x1, &x6, &x11, &x12); | ||
| quarterround(&x2, &x7, &x8, &x13); | ||
| quarterround(&x3, &x4, &x9, &x14); | ||
| } | ||
|
|
||
| x0 += CHACHA_MAGIC_NUMBER_PART_1; | ||
| x1 += CHACHA_MAGIC_NUMBER_PART_2; | ||
| x2 += CHACHA_MAGIC_NUMBER_PART_3; | ||
| x3 += CHACHA_MAGIC_NUMBER_PART_4; | ||
| x4 += Utils_Deserialize32LE((uint8_t*)&key[0]); | ||
| x5 += Utils_Deserialize32LE((uint8_t*)&key[4]); | ||
| x6 += Utils_Deserialize32LE((uint8_t*)&key[8]); | ||
| x7 += Utils_Deserialize32LE((uint8_t*)&key[12]); | ||
| x8 += Utils_Deserialize32LE((uint8_t*)&key[16]); | ||
| x9 += Utils_Deserialize32LE((uint8_t*)&key[20]); | ||
| x10 += Utils_Deserialize32LE((uint8_t*)&key[24]); | ||
| x11 += Utils_Deserialize32LE((uint8_t*)&key[28]); | ||
| x12 += counter; | ||
| x13 += Utils_Deserialize32LE((uint8_t*)&nonce[0]); | ||
| x14 += Utils_Deserialize32LE((uint8_t*)&nonce[4]); | ||
| x15 += Utils_Deserialize32LE((uint8_t*)&nonce[8]); | ||
|
|
||
| Utils_Serialize32LE((uint8_t*)&out[0], x0); | ||
| Utils_Serialize32LE((uint8_t*)&out[4], x1); | ||
| Utils_Serialize32LE((uint8_t*)&out[8], x2); | ||
| Utils_Serialize32LE((uint8_t*)&out[12], x3); | ||
| Utils_Serialize32LE((uint8_t*)&out[16], x4); | ||
| Utils_Serialize32LE((uint8_t*)&out[20], x5); | ||
| Utils_Serialize32LE((uint8_t*)&out[24], x6); | ||
| Utils_Serialize32LE((uint8_t*)&out[28], x7); | ||
| Utils_Serialize32LE((uint8_t*)&out[32], x8); | ||
| Utils_Serialize32LE((uint8_t*)&out[36], x9); | ||
| Utils_Serialize32LE((uint8_t*)&out[40], x10); | ||
| Utils_Serialize32LE((uint8_t*)&out[44], x11); | ||
| Utils_Serialize32LE((uint8_t*)&out[48], x12); | ||
| Utils_Serialize32LE((uint8_t*)&out[52], x13); | ||
| Utils_Serialize32LE((uint8_t*)&out[56], x14); | ||
| Utils_Serialize32LE((uint8_t*)&out[60], x15); | ||
| } | ||
|
|
||
| void | ||
| chacha20(const byte_t* plaintext, | ||
| uint32_t plaintext_len, | ||
| const byte_t key[CHACHA20_KEY_SIZE], | ||
| const byte_t nonce[CHACHA20_NONCE_SIZE], | ||
| uint32_t inc, | ||
| byte_t* encrypted_message) { | ||
|
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| uint32_t blocks = plaintext_len / BLOCK_SIZE; | ||
| uint32_t remaining_bytes = plaintext_len % BLOCK_SIZE; | ||
|
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| for (uint32_t j = 0; j < blocks; ++j) { | ||
| byte_t key_stream[KEY_STREAM_SIZE] = ARRAY_64_ZERO_VALUES; | ||
| chacha20_block(key, j + inc, nonce, key_stream); | ||
|
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| for (uint8_t i = 0; i < BLOCK_SIZE; ++i) { | ||
| encrypted_message[(j * BLOCK_SIZE) + i] = plaintext[(j * BLOCK_SIZE) + i] ^ key_stream[i]; | ||
| } | ||
| } | ||
|
|
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| if (0U != remaining_bytes) { | ||
| byte_t key_stream[KEY_STREAM_SIZE] = ARRAY_64_ZERO_VALUES; | ||
| chacha20_block(key, blocks + inc, nonce, key_stream); | ||
|
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| for (uint32_t i = 0; i < remaining_bytes; ++i) { | ||
| encrypted_message[(blocks * BLOCK_SIZE) + i] = plaintext[(blocks * BLOCK_SIZE) + i] ^ key_stream[i]; | ||
| } | ||
| } | ||
| } |
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