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cathugger 2017-09-24 22:13:16 +03:00
commit 9b80e8676c
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ed25519/ref10/sign.c Normal file
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#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;
}