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/*
* (C) 2019 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#include <botan/sodium.h>
#include <botan/stream_cipher.h>
namespace Botan {
int Sodium::crypto_stream_chacha20(uint8_t out[], size_t out_len,
const uint8_t nonce[], const uint8_t key[])
{
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_chacha20_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_chacha20_NONCEBYTES);
chacha->write_keystream(out, out_len);
return 0;
}
int Sodium::crypto_stream_chacha20_xor(uint8_t out[], const uint8_t in[],
size_t in_len, const uint8_t nonce[],
const uint8_t key[])
{
return crypto_stream_chacha20_xor_ic(out, in, in_len, nonce, 0, key);
}
int Sodium::crypto_stream_chacha20_xor_ic(uint8_t out[], const uint8_t in[],
size_t in_len,
const uint8_t nonce[], uint64_t ic,
const uint8_t key[])
{
if((ic >> 6) != 0) // otherwise multiply overflows
return -1;
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_chacha20_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_chacha20_NONCEBYTES);
chacha->seek(ic * 64);
chacha->cipher(in, out, in_len);
return 0;
}
int Sodium::crypto_stream_chacha20_ietf(uint8_t out[], size_t out_len,
const uint8_t nonce[], const uint8_t key[])
{
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_chacha20_ietf_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_chacha20_ietf_NONCEBYTES);
chacha->write_keystream(out, out_len);
return 0;
}
int Sodium::crypto_stream_chacha20_ietf_xor(uint8_t out[],
const uint8_t in[], size_t in_len,
const uint8_t nonce[],
const uint8_t key[])
{
return crypto_stream_chacha20_ietf_xor_ic(out, in, in_len, nonce, 0, key);
}
int Sodium::crypto_stream_chacha20_ietf_xor_ic(uint8_t out[],
const uint8_t in[], size_t in_len,
const uint8_t nonce[], uint32_t ic,
const uint8_t key[])
{
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_chacha20_ietf_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_chacha20_ietf_NONCEBYTES);
chacha->seek(static_cast<uint64_t>(ic) * 64);
chacha->cipher(in, out, in_len);
return 0;
}
int Sodium::crypto_stream_xchacha20(uint8_t out[], size_t out_len,
const uint8_t nonce[], const uint8_t key[])
{
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_xchacha20_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_xchacha20_NONCEBYTES);
chacha->write_keystream(out, out_len);
return 0;
}
int Sodium::crypto_stream_xchacha20_xor(uint8_t out[], const uint8_t in[],
size_t in_len, const uint8_t nonce[],
const uint8_t key[])
{
return crypto_stream_xchacha20_xor_ic(out, in, in_len, nonce, 0, key);
}
int Sodium::crypto_stream_xchacha20_xor_ic(uint8_t out[], const uint8_t in[],
size_t in_len,
const uint8_t nonce[], uint64_t ic,
const uint8_t key[])
{
if((ic >> 6) != 0) // otherwise multiply overflows
return -1;
auto chacha = StreamCipher::create_or_throw("ChaCha(20)");
chacha->set_key(key, crypto_stream_xchacha20_KEYBYTES);
chacha->set_iv(nonce, crypto_stream_xchacha20_NONCEBYTES);
chacha->seek(ic * 64);
chacha->cipher(in, out, in_len);
return 0;
}
}
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