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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/salsa20.h>
#include <botan/loadstor.h>
namespace Botan {
int Sodium::crypto_core_hsalsa20(uint8_t out[], const uint8_t in[],
const uint8_t key[], const uint8_t c[])
{
uint32_t in32[16] = { 0 };
static const uint32_t SIGMA[] =
{ 0x61707865, 0x3320646e, 0x79622d32, 0x6b206574 };
if(c == nullptr)
{
in32[0] = SIGMA[0];
in32[5] = SIGMA[1];
in32[10] = SIGMA[2];
in32[15] = SIGMA[3];
}
else
{
in32[0] = load_le<uint32_t>(c, 0);
in32[5] = load_le<uint32_t>(c, 1);
in32[10] = load_le<uint32_t>(c, 2);
in32[15] = load_le<uint32_t>(c, 3);
}
in32[1] = load_le<uint32_t>(key, 0);
in32[2] = load_le<uint32_t>(key, 1);
in32[3] = load_le<uint32_t>(key, 2);
in32[4] = load_le<uint32_t>(key, 3);
in32[6] = load_le<uint32_t>(in, 0);
in32[7] = load_le<uint32_t>(in, 1);
in32[8] = load_le<uint32_t>(in, 2);
in32[9] = load_le<uint32_t>(in, 3);
in32[11] = load_le<uint32_t>(key, 4);
in32[12] = load_le<uint32_t>(key, 5);
in32[13] = load_le<uint32_t>(key, 6);
in32[14] = load_le<uint32_t>(key, 7);
uint32_t out32[8] = { 0 };
Salsa20::hsalsa20(out32, in32);
copy_out_le(out, 32, out32);
return 0;
}
int Sodium::crypto_stream_salsa20(uint8_t out[], size_t out_len,
const uint8_t nonce[], const uint8_t key[])
{
Salsa20 salsa;
salsa.set_key(key, crypto_stream_salsa20_KEYBYTES);
salsa.set_iv(nonce, crypto_stream_salsa20_NONCEBYTES);
salsa.write_keystream(out, out_len);
return 0;
}
int Sodium::crypto_stream_salsa20_xor(uint8_t out[], const uint8_t in[],
size_t in_len, const uint8_t nonce[],
const uint8_t key[])
{
return crypto_stream_salsa20_xor_ic(out, in, in_len, nonce, 0, key);
}
int Sodium::crypto_stream_salsa20_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;
Salsa20 salsa;
salsa.set_key(key, crypto_stream_salsa20_KEYBYTES);
salsa.set_iv(nonce, crypto_stream_salsa20_NONCEBYTES);
salsa.seek(ic * 64);
salsa.cipher(in, out, in_len);
return 0;
}
int Sodium::crypto_stream_xsalsa20(uint8_t out[], size_t out_len,
const uint8_t nonce[], const uint8_t key[])
{
Salsa20 salsa;
salsa.set_key(key, crypto_stream_xsalsa20_KEYBYTES);
salsa.set_iv(nonce, crypto_stream_xsalsa20_NONCEBYTES);
salsa.write_keystream(out, out_len);
return 0;
}
int Sodium::crypto_stream_xsalsa20_xor(uint8_t out[], const uint8_t in[],
size_t in_len, const uint8_t nonce[],
const uint8_t key[])
{
return crypto_stream_xsalsa20_xor_ic(out, in, in_len, nonce, 0, key);
}
int Sodium::crypto_stream_xsalsa20_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;
Salsa20 salsa;
salsa.set_key(key, crypto_stream_xsalsa20_KEYBYTES);
salsa.set_iv(nonce, crypto_stream_xsalsa20_NONCEBYTES);
salsa.seek(ic * 64);
salsa.cipher(in, out, in_len);
return 0;
}
}
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