mirror of
https://github.com/Laupetin/OpenAssetTools.git
synced 2025-11-04 04:27:15 +00:00
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/*
|
|
BASED ON salsa20-ref.c version 20051118
|
|
original author: D. J. Bernstein
|
|
Public domain.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <stdint.h>
|
|
|
|
#ifdef __cplusplus
|
|
extern "C" {
|
|
#endif
|
|
|
|
typedef struct salsa20_ctx
|
|
{
|
|
uint32_t m_input[16];
|
|
} salsa20_ctx_t;
|
|
|
|
/*
|
|
* Initializes the context with the chosen key.
|
|
*
|
|
* ctx: The context to initialize.
|
|
* key: A pointer to the key bytes.
|
|
* keySize: The length of the key in bits. Has to be 128 or 256.
|
|
*/
|
|
void Salsa20_KeySetup(salsa20_ctx_t* ctx, const uint8_t* key, uint32_t keySize);
|
|
|
|
/*
|
|
* Initializes or changes the IV of the context.
|
|
* Can be called multiple times on the same context in order to encrypt/decrypt messages with the same key but different IV's.
|
|
*
|
|
* ctx: The context to initialize.
|
|
* iv: A pointer to the IV bytes. Must be 64 bits long.
|
|
*/
|
|
void Salsa20_IVSetup(salsa20_ctx_t* ctx, const uint8_t* iv);
|
|
|
|
/*
|
|
* Encrypts the specified amount of plain text and writes it to the cipher text buffer.
|
|
* The cipher text buffer and the plain text buffer can be the same.
|
|
*
|
|
* ctx: The context that was previously initialized with a key and IV.
|
|
* cipherText: A pointer to the cipher text buffer which must at least be msgLen bytes.
|
|
* plainText: A pointer to the plain text buffer which must at least be msgLen bytes.
|
|
* msgLen: The amount of bytes to encrypt.
|
|
*/
|
|
void Salsa20_Encrypt_Bytes(salsa20_ctx_t* ctx, const uint8_t* plainText, uint8_t* cipherText, uint32_t msgLen);
|
|
|
|
/*
|
|
* Decrypts the specified amount of cipher text and writes it to the plain text buffer.
|
|
* The cipher text buffer and the plain text buffer can be the same.
|
|
* Internally just calls the encryption method.
|
|
*
|
|
* ctx: The context that was previously initialized with a key and IV.
|
|
* cipherText: A pointer to the cipher text buffer which must at least be msgLen bytes.
|
|
* plainText: A pointer to the plain text buffer which must at least be msgLen bytes.
|
|
* msgLen: The amount of bytes to decrypt.
|
|
*/
|
|
void Salsa20_Decrypt_Bytes(salsa20_ctx_t* ctx, const uint8_t* cipherText, uint8_t* plainText, uint32_t msgLen);
|
|
|
|
#ifdef __cplusplus
|
|
}
|
|
#endif |