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Version v0.3.37 - Implement ChaCha20 nonce extension to support pads larger than 256GB

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Laan Tungir
2025-12-24 10:00:27 -05:00
parent 2c311a9a61
commit 977da58a3b
5 changed files with 366 additions and 10 deletions
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27
src/nostr_chacha20.h
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@@ -63,10 +63,10 @@ int chacha20_block(const uint8_t key[32], uint32_t counter,
/**
* ChaCha20 encryption/decryption
*
*
* Encrypts or decrypts data using ChaCha20 stream cipher.
* Since ChaCha20 is a stream cipher, encryption and decryption are the same operation.
*
*
* @param key[in] 32-byte key
* @param counter[in] Initial 32-bit counter value
* @param nonce[in] 12-byte nonce
@@ -75,10 +75,29 @@ int chacha20_block(const uint8_t key[32], uint32_t counter,
* @param length[in] Length of input data in bytes
* @return 0 on success, negative on error
*/
int chacha20_encrypt(const uint8_t key[32], uint32_t counter,
const uint8_t nonce[12], const uint8_t* input,
int chacha20_encrypt(const uint8_t key[32], uint32_t counter,
const uint8_t nonce[12], const uint8_t* input,
uint8_t* output, size_t length);
/**
* ChaCha20 encryption/decryption with extended counter (64-bit)
*
* Extended version that supports files larger than 256GB by using
* part of the nonce as a high-order counter extension.
*
* @param key[in] 32-byte key
* @param counter_low[in] Initial 32-bit counter value (low bits)
* @param counter_high[in] Initial 32-bit counter value (high bits)
* @param nonce[in] 8-byte reduced nonce (instead of 12)
* @param input[in] Input data to encrypt/decrypt
* @param output[out] Output buffer (can be same as input)
* @param length[in] Length of input data in bytes
* @return 0 on success, negative on error
*/
int chacha20_encrypt_extended(const uint8_t key[32], uint32_t counter_low,
uint32_t counter_high, const uint8_t nonce[8],
const uint8_t* input, uint8_t* output, size_t length);
/*
* ============================================================================
* UTILITY FUNCTIONS