mirror of
https://github.com/oxen-io/session-android.git
synced 2024-12-18 22:17:30 +00:00
42 lines
817 B
C
42 lines
817 B
C
|
#include <string.h>
|
||
|
|
#include "crypto_sign.h"
|
||
|
|
#include "crypto_hash_sha512.h"
|
||
|
|
#include "ge.h"
|
||
|
|
#include "sc.h"
|
||
|
|
|
||
|
|
int crypto_sign(
|
||
|
|
unsigned char *sm,unsigned long long *smlen,
|
||
|
|
const unsigned char *m,unsigned long long mlen,
|
||
|
|
const unsigned char *sk
|
||
|
|
)
|
||
|
|
{
|
||
|
|
unsigned char pk[32];
|
||
|
|
unsigned char az[64];
|
||
|
|
unsigned char nonce[64];
|
||
|
|
unsigned char hram[64];
|
||
|
|
ge_p3 R;
|
||
|
|
|
||
|
|
memmove(pk,sk + 32,32);
|
||
|
|
|
||
|
|
crypto_hash_sha512(az,sk,32);
|
||
|
|
az[0] &= 248;
|
||
|
|
az[31] &= 63;
|
||
|
|
az[31] |= 64;
|
||
|
|
|
||
|
|
*smlen = mlen + 64;
|
||
|
|
memmove(sm + 64,m,mlen);
|
||
|
|
memmove(sm + 32,az + 32,32);
|
||
|
|
crypto_hash_sha512(nonce,sm + 32,mlen + 32);
|
||
|
|
memmove(sm + 32,pk,32);
|
||
|
|
|
||
|
|
sc_reduce(nonce);
|
||
|
|
ge_scalarmult_base(&R,nonce);
|
||
|
|
ge_p3_tobytes(sm,&R);
|
||
|
|
|
||
|
|
crypto_hash_sha512(hram,sm,mlen + 64);
|
||
|
|
sc_reduce(hram);
|
||
|
|
sc_muladd(sm + 32,hram,az,nonce);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|