54 lines
1.4 KiB
C++
54 lines
1.4 KiB
C++
#pragma once
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#include <stdint.h>
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#include <stddef.h>
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#define CHACHA8_KEY_SIZE 32
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#define CHACHA8_IV_SIZE 8
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#if defined(__cplusplus)
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#include <memory.h>
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#include <string>
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#include "hash.h"
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namespace Crypto {
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extern "C" {
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#endif
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void chacha8(const void* data, size_t length, const uint8_t* key, const uint8_t* iv, char* cipher);
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#if defined(__cplusplus)
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}
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#pragma pack(push, 1)
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struct chacha8_key {
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uint8_t data[CHACHA8_KEY_SIZE];
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~chacha8_key()
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{
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memset(data, 0, sizeof(data));
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}
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};
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// MS VC 2012 doesn't interpret `class chacha8_iv` as POD in spite of [9.0.10], so it is a struct
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struct chacha8_iv {
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uint8_t data[CHACHA8_IV_SIZE];
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};
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#pragma pack(pop)
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static_assert(sizeof(chacha8_key) == CHACHA8_KEY_SIZE && sizeof(chacha8_iv) == CHACHA8_IV_SIZE, "Invalid structure size");
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inline void chacha8(const void* data, size_t length, const chacha8_key& key, const chacha8_iv& iv, char* cipher) {
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chacha8(data, length, reinterpret_cast<const uint8_t*>(&key), reinterpret_cast<const uint8_t*>(&iv), cipher);
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}
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inline void generate_chacha8_key(Crypto::cn_context &context, const std::string& password, chacha8_key& key) {
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static_assert(sizeof(chacha8_key) <= sizeof(Hash), "Size of hash must be at least that of chacha8_key");
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Hash pwd_hash;
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cn_slow_hash(context, password.data(), password.size(), pwd_hash);
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memcpy(&key, &pwd_hash, sizeof(key));
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memset(&pwd_hash, 0, sizeof(pwd_hash));
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}
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}
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#endif
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