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#include <stdlib.h>
#include "crypto_core_hchacha20.h"
#include "crypto_stream_chacha20.h"
#include "crypto_stream_xchacha20.h"
#include "private/common.h"
#include "randombytes.h"
size_t
crypto_stream_xchacha20_keybytes(void)
{
return crypto_stream_xchacha20_KEYBYTES;
}
size_t
crypto_stream_xchacha20_noncebytes(void)
{
return crypto_stream_xchacha20_NONCEBYTES;
}
size_t
crypto_stream_xchacha20_messagebytes_max(void)
{
return crypto_stream_xchacha20_MESSAGEBYTES_MAX;
}
int
crypto_stream_xchacha20(unsigned char *c, unsigned long long clen,
const unsigned char *n, const unsigned char *k)
{
unsigned char k2[crypto_core_hchacha20_OUTPUTBYTES];
crypto_core_hchacha20(k2, n, k, NULL);
COMPILER_ASSERT(crypto_stream_chacha20_KEYBYTES <= sizeof k2);
COMPILER_ASSERT(crypto_stream_chacha20_NONCEBYTES ==
crypto_stream_xchacha20_NONCEBYTES -
crypto_core_hchacha20_INPUTBYTES);
return crypto_stream_chacha20(c, clen, n + crypto_core_hchacha20_INPUTBYTES,
k2);
}
int
crypto_stream_xchacha20_xor_ic(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
uint64_t ic, const unsigned char *k)
{
unsigned char k2[crypto_core_hchacha20_OUTPUTBYTES];
crypto_core_hchacha20(k2, n, k, NULL);
return crypto_stream_chacha20_xor_ic(
c, m, mlen, n + crypto_core_hchacha20_INPUTBYTES, ic, k2);
}
int
crypto_stream_xchacha20_xor(unsigned char *c, const unsigned char *m,
unsigned long long mlen, const unsigned char *n,
const unsigned char *k)
{
return crypto_stream_xchacha20_xor_ic(c, m, mlen, n, 0U, k);
}
void
crypto_stream_xchacha20_keygen(
unsigned char k[crypto_stream_xchacha20_KEYBYTES])
{
randombytes_buf(k, crypto_stream_xchacha20_KEYBYTES);
}
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