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#include <stdlib.h>
#include <string.h>
/*#include "crypto_sign.h"
#include "crypto_hash_sha512.h"*/
#include "ge25519.h"
/* Original */
#if 0
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];
sc25519 sck, scs, scsk;
ge25519 ger;
memmove(pk,sk + 32,32);
/* pk: 32-byte public key A */
crypto_hash_sha512(az,sk,32);
az[0] &= 248;
az[31] &= 127;
az[31] |= 64;
/* az: 32-byte scalar a, 32-byte randomizer z */
*smlen = mlen + 64;
memmove(sm + 64,m,mlen);
memmove(sm + 32,az + 32,32);
/* sm: 32-byte uninit, 32-byte z, mlen-byte m */
crypto_hash_sha512(nonce, sm+32, mlen+32);
/* nonce: 64-byte H(z,m) */
sc25519_from64bytes(&sck, nonce);
ge25519_scalarmult_base(&ger, &sck);
ge25519_pack(sm, &ger);
/* sm: 32-byte R, 32-byte z, mlen-byte m */
memmove(sm + 32,pk,32);
/* sm: 32-byte R, 32-byte A, mlen-byte m */
crypto_hash_sha512(hram,sm,mlen + 64);
/* hram: 64-byte H(R,A,m) */
sc25519_from64bytes(&scs, hram);
sc25519_from32bytes(&scsk, az);
sc25519_mul(&scs, &scs, &scsk);
sc25519_add(&scs, &scs, &sck);
/* scs: S = nonce + H(R,A,m)a */
sc25519_to32bytes(sm + 32,&scs);
/* sm: 32-byte R, 32-byte S, mlen-byte m */
return 0;
}
#endif
#if 0
void C25519::sign(const C25519::Private &myPrivate,const C25519::Public &myPublic,const void *msg,unsigned int len,void *signature)
{
sc25519 sck, scs, scsk;
ge25519 ger;
unsigned char r[32];
unsigned char s[32];
unsigned char extsk[64];
unsigned char hmg[crypto_hash_sha512_BYTES];
unsigned char hram[crypto_hash_sha512_BYTES];
unsigned char *sig = (unsigned char *)signature;
unsigned char digest[64]; // we sign the first 32 bytes of SHA-512(msg)
SHA512::hash(digest,msg,len);
SHA512::hash(extsk,myPrivate.data + 32,32);
extsk[0] &= 248;
extsk[31] &= 127;
extsk[31] |= 64;
for(unsigned int i=0;i<32;i++)
sig[32 + i] = extsk[32 + i];
for(unsigned int i=0;i<32;i++)
sig[64 + i] = digest[i];
SHA512::hash(hmg,sig + 32,64);
/* Computation of R */
sc25519_from64bytes(&sck, hmg);
ge25519_scalarmult_base(&ger, &sck);
ge25519_pack(r, &ger);
/* Computation of s */
for(unsigned int i=0;i<32;i++)
sig[i] = r[i];
get_hram(hram,sig,myPublic.data + 32,sig,96);
sc25519_from64bytes(&scs, hram);
sc25519_from32bytes(&scsk, extsk);
sc25519_mul(&scs, &scs, &scsk);
sc25519_add(&scs, &scs, &sck);
sc25519_to32bytes(s,&scs); /* cat s */
for(unsigned int i=0;i<32;i++)
sig[32 + i] = s[i];
}
void get_hram(unsigned char *hram, const unsigned char *sm, const unsigned char *pk, unsigned char *playground, unsigned long long smlen)
{
unsigned long long i;
for (i = 0;i < 32;++i) playground[i] = sm[i];
for (i = 32;i < 64;++i) playground[i] = pk[i-32];
for (i = 64;i < smlen;++i) playground[i] = sm[i];
//crypto_hash_sha512(hram,playground,smlen);
ZeroTier::SHA512::hash(hram,playground,(unsigned int)smlen);
}
#endif
extern void ZT_sha512internal(void *digest,const void *data,unsigned int len);
extern void ed25519_amd64_asm_sign(const unsigned char *sk,const unsigned char *pk,const unsigned char *m,const unsigned int mlen,unsigned char *sig)
{
unsigned char az[64];
unsigned char nonce[64];
unsigned char hram[64];
sc25519 sck, scs, scsk;
ge25519 ger;
unsigned char digest[64];
unsigned int i;
ZT_sha512internal(digest,m,mlen);
ZT_sha512internal(az,sk,32);
az[0] &= 248;
az[31] &= 127;
az[31] |= 64;
for(i=0;i<32;i++)
sig[32 + i] = az[32 + i];
for(i=0;i<32;i++)
sig[64 + i] = digest[i];
ZT_sha512internal(nonce,sig + 32,64);
sc25519_from64bytes(&sck, nonce);
ge25519_scalarmult_base(&ger, &sck);
ge25519_pack(sig, &ger);
memmove(sig + 32,pk,32);
ZT_sha512internal(hram,sig,96);
sc25519_from64bytes(&scs, hram);
sc25519_from32bytes(&scsk, az);
sc25519_mul(&scs, &scs, &scsk);
sc25519_add(&scs, &scs, &sck);
sc25519_to32bytes(sig + 32,&scs);
}
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