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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,75 @@ | ||
| /**************************************************************************** | ||
| * | ||
| * Copyright (c) 2024 IMProject Development Team. All rights reserved. | ||
| * Authors: Igor Misic <igy1000mb@gmail.com> | ||
| * | ||
| * 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" | ||
|
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| #define CHACHA20_KEY_SIZE 32U | ||
| #define CHACHA20_NONCE_SIZE 12U | ||
|
|
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| /** | ||
| * @brief Encrypts or decrypts a plaintext message using the ChaCha20 stream cipher. | ||
| * | ||
| * This function encrypts or decrypts a plaintext message using the ChaCha20 stream cipher algorithm. | ||
| * ChaCha20 is a symmetric encryption algorithm that operates on 64-byte blocks, producing a stream of keystream bytes | ||
| * which are XORed with the plaintext to produce the ciphertext, or vice versa. | ||
| * | ||
| * @param[in] plaintext Pointer to the plaintext message to be encrypted or decrypted. | ||
| * @param[in] plaintext_len Length of the plaintext message in bytes. | ||
| * @param[in] key Array containing the key for encryption/decryption. It must be of size CHACHA20_KEY_SIZE bytes. | ||
| * @param[in] nonce Array containing the nonce value. It must be of size CHACHA20_NONCE_SIZE bytes. | ||
| * @param[in] inc Initial block counter value (usually starts from 0 and incremented for each block). | ||
| * @param[out] result Pointer to the buffer where the resulting encrypted or decrypted message will be stored. | ||
| * The buffer must have enough space to hold the resulting ciphertext or plaintext, which is | ||
| * the same size as the plaintext message. | ||
| * | ||
| * @note The length of the key must be CHACHA20_KEY_SIZE (32 bytes). | ||
| * @note The length of the nonce must be CHACHA20_NONCE_SIZE (12 bytes). | ||
| * @note The encrypted_message buffer must have enough space to accommodate the resulting ciphertext or plaintext, | ||
| * which will be the same size as the plaintext message. | ||
| * | ||
| * @warning This function does not perform any bounds checking on the input buffers. It is the responsibility of the | ||
| * caller to ensure that the buffers are valid and have the correct sizes. | ||
| */ | ||
|
|
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| void Chacha20_crypt(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* result); | ||
|
|
||
| #endif /* UTILITY_CHACHA20_H_ */ |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| /**************************************************************************** | ||
| * | ||
| * Copyright (c) 2024 IMProject Development Team. All rights reserved. | ||
| * Authors: Igor Misic <igy1000mb@gmail.com> | ||
| * | ||
| * 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 | ||
|
|
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| // 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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| #define CHACHA20_ROUNDS 10U // 20 inner ChaCha20 rounds, 2 rounds per loop | ||
|
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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 | ||
| Block(const byte_t key[CHACHA20_KEY_SIZE], uint32_t counter, const byte_t nonce[CHACHA20_NONCE_SIZE], | ||
| byte_t out[KEY_STREAM_SIZE]) { | ||
|
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| 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(&key[0]); | ||
| uint32_t x5 = Utils_Deserialize32LE(&key[4]); | ||
| uint32_t x6 = Utils_Deserialize32LE(&key[8]); | ||
| uint32_t x7 = Utils_Deserialize32LE(&key[12]); | ||
| uint32_t x8 = Utils_Deserialize32LE(&key[16]); | ||
| uint32_t x9 = Utils_Deserialize32LE(&key[20]); | ||
| uint32_t x10 = Utils_Deserialize32LE(&key[24]); | ||
| uint32_t x11 = Utils_Deserialize32LE(&key[28]); | ||
| uint32_t x12 = counter; | ||
| uint32_t x13 = Utils_Deserialize32LE(&nonce[0]); | ||
| uint32_t x14 = Utils_Deserialize32LE(&nonce[4]); | ||
| uint32_t x15 = Utils_Deserialize32LE(&nonce[8]); | ||
|
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||
| for (uint8_t i = 0U; i < CHACHA20_ROUNDS; ++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); | ||
| } | ||
|
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| 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(&key[0]); | ||
| x5 += Utils_Deserialize32LE(&key[4]); | ||
| x6 += Utils_Deserialize32LE(&key[8]); | ||
| x7 += Utils_Deserialize32LE(&key[12]); | ||
| x8 += Utils_Deserialize32LE(&key[16]); | ||
| x9 += Utils_Deserialize32LE(&key[20]); | ||
| x10 += Utils_Deserialize32LE(&key[24]); | ||
| x11 += Utils_Deserialize32LE(&key[28]); | ||
| x12 += counter; | ||
| x13 += Utils_Deserialize32LE(&nonce[0]); | ||
| x14 += Utils_Deserialize32LE(&nonce[4]); | ||
| x15 += Utils_Deserialize32LE(&nonce[8]); | ||
|
|
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| /* -E> compliant MC3R1.R18.6 16 automatic storage pointed with "out" is not copied to values from this function */ | ||
| Utils_Serialize32LE(&out[0], x0); | ||
| Utils_Serialize32LE(&out[4], x1); | ||
| Utils_Serialize32LE(&out[8], x2); | ||
| Utils_Serialize32LE(&out[12], x3); | ||
| Utils_Serialize32LE(&out[16], x4); | ||
| Utils_Serialize32LE(&out[20], x5); | ||
| Utils_Serialize32LE(&out[24], x6); | ||
| Utils_Serialize32LE(&out[28], x7); | ||
| Utils_Serialize32LE(&out[32], x8); | ||
| Utils_Serialize32LE(&out[36], x9); | ||
| Utils_Serialize32LE(&out[40], x10); | ||
| Utils_Serialize32LE(&out[44], x11); | ||
| Utils_Serialize32LE(&out[48], x12); | ||
| Utils_Serialize32LE(&out[52], x13); | ||
| Utils_Serialize32LE(&out[56], x14); | ||
| Utils_Serialize32LE(&out[60], x15); | ||
| } | ||
|
|
||
| void | ||
| Chacha20_crypt(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* result) { | ||
|
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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; | ||
| Block(key, j + inc, nonce, key_stream); | ||
|
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| for (uint8_t i = 0; i < BLOCK_SIZE; ++i) { | ||
| result[(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; | ||
| Block(key, blocks + inc, nonce, key_stream); | ||
|
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| for (uint32_t i = 0; i < remaining_bytes; ++i) { | ||
| result[(blocks * BLOCK_SIZE) + i] = plaintext[(blocks * BLOCK_SIZE) + i] ^ key_stream[i]; | ||
| } | ||
| } | ||
| } |
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