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correct chacha20 for multiple messages

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orignal
2018-11-30 16:21:11 -05:00
parent e68f1dbc99
commit ef6db64e9f
4 changed files with 81 additions and 58 deletions
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29
libi2pd/ChaCha20.h
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@@ -18,12 +18,28 @@ namespace i2p
{
namespace crypto
{
const std::size_t CHACHA20_KEY_BYTES = 32;
const std::size_t CHACHA20_NOUNCE_BYTES = 12;
const std::size_t CHACHA20_KEY_BYTES = 32;
const std::size_t CHACHA20_NOUNCE_BYTES = 12;
namespace chacha
{
constexpr std::size_t blocksize = 64;
constexpr int rounds = 20;
struct Chacha20State;
struct Chacha20Block
{
Chacha20Block () {};
Chacha20Block (Chacha20Block &&) = delete;
uint8_t data[blocksize];
void operator << (const Chacha20State & st);
};
struct Chacha20State
{
Chacha20State () {};
Chacha20State (): offset (0) {};
Chacha20State (Chacha20State &&) = delete;
Chacha20State & operator += (const Chacha20State & other)
@@ -38,10 +54,13 @@ namespace crypto
memcpy(data, other.data, sizeof(uint32_t) * 16);
}
uint32_t data[16];
};
Chacha20Block block;
size_t offset;
};
void Chacha20Init (Chacha20State& state, const uint8_t * nonce, const uint8_t * key, uint32_t counter);
void Chacha20Encrypt (Chacha20State& state, uint8_t * buf, size_t sz);
void Chacha20Encrypt (Chacha20State& state, uint8_t * buf, size_t sz);
}
/** encrypt buf in place with chacha20 */
void chacha20(uint8_t * buf, size_t sz, const uint8_t * nonce, const uint8_t * key, uint32_t counter=1);