mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-23 18:32:26 +00:00
8a56dc2b6b
[blocks.c ed25519.c fe25519.c fe25519.h ge25519.c ge25519.h]
[ge25519_base.data hash.c sc25519.c sc25519.h verify.c]
Add Authors for the public domain ed25519/nacl code.
see also http://nacl.cr.yp.to/features.html
All of the NaCl software is in the public domain.
and http://ed25519.cr.yp.to/software.html
The Ed25519 software is in the public domain.
145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/* $OpenBSD: ed25519.c,v 1.3 2013/12/09 11:03:45 markus Exp $ */
|
|
|
|
/*
|
|
* Public Domain, Authors: Daniel J. Bernstein, Niels Duif, Tanja Lange,
|
|
* Peter Schwabe, Bo-Yin Yang.
|
|
* Copied from supercop-20130419/crypto_sign/ed25519/ref/ed25519.c
|
|
*/
|
|
|
|
#include "includes.h"
|
|
#include "crypto_api.h"
|
|
|
|
#include "ge25519.h"
|
|
|
|
static 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);
|
|
}
|
|
|
|
|
|
int crypto_sign_ed25519_keypair(
|
|
unsigned char *pk,
|
|
unsigned char *sk
|
|
)
|
|
{
|
|
sc25519 scsk;
|
|
ge25519 gepk;
|
|
unsigned char extsk[64];
|
|
int i;
|
|
|
|
randombytes(sk, 32);
|
|
crypto_hash_sha512(extsk, sk, 32);
|
|
extsk[0] &= 248;
|
|
extsk[31] &= 127;
|
|
extsk[31] |= 64;
|
|
|
|
sc25519_from32bytes(&scsk,extsk);
|
|
|
|
ge25519_scalarmult_base(&gepk, &scsk);
|
|
ge25519_pack(pk, &gepk);
|
|
for(i=0;i<32;i++)
|
|
sk[32 + i] = pk[i];
|
|
return 0;
|
|
}
|
|
|
|
int crypto_sign_ed25519(
|
|
unsigned char *sm,unsigned long long *smlen,
|
|
const unsigned char *m,unsigned long long mlen,
|
|
const unsigned char *sk
|
|
)
|
|
{
|
|
sc25519 sck, scs, scsk;
|
|
ge25519 ger;
|
|
unsigned char r[32];
|
|
unsigned char s[32];
|
|
unsigned char extsk[64];
|
|
unsigned long long i;
|
|
unsigned char hmg[crypto_hash_sha512_BYTES];
|
|
unsigned char hram[crypto_hash_sha512_BYTES];
|
|
|
|
crypto_hash_sha512(extsk, sk, 32);
|
|
extsk[0] &= 248;
|
|
extsk[31] &= 127;
|
|
extsk[31] |= 64;
|
|
|
|
*smlen = mlen+64;
|
|
for(i=0;i<mlen;i++)
|
|
sm[64 + i] = m[i];
|
|
for(i=0;i<32;i++)
|
|
sm[32 + i] = extsk[32+i];
|
|
|
|
crypto_hash_sha512(hmg, sm+32, mlen+32); /* Generate k as h(extsk[32],...,extsk[63],m) */
|
|
|
|
/* Computation of R */
|
|
sc25519_from64bytes(&sck, hmg);
|
|
ge25519_scalarmult_base(&ger, &sck);
|
|
ge25519_pack(r, &ger);
|
|
|
|
/* Computation of s */
|
|
for(i=0;i<32;i++)
|
|
sm[i] = r[i];
|
|
|
|
get_hram(hram, sm, sk+32, sm, mlen+64);
|
|
|
|
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(i=0;i<32;i++)
|
|
sm[32 + i] = s[i];
|
|
|
|
return 0;
|
|
}
|
|
|
|
int crypto_sign_ed25519_open(
|
|
unsigned char *m,unsigned long long *mlen,
|
|
const unsigned char *sm,unsigned long long smlen,
|
|
const unsigned char *pk
|
|
)
|
|
{
|
|
unsigned int i;
|
|
int ret;
|
|
unsigned char t2[32];
|
|
ge25519 get1, get2;
|
|
sc25519 schram, scs;
|
|
unsigned char hram[crypto_hash_sha512_BYTES];
|
|
|
|
*mlen = (unsigned long long) -1;
|
|
if (smlen < 64) return -1;
|
|
|
|
if (ge25519_unpackneg_vartime(&get1, pk)) return -1;
|
|
|
|
get_hram(hram,sm,pk,m,smlen);
|
|
|
|
sc25519_from64bytes(&schram, hram);
|
|
|
|
sc25519_from32bytes(&scs, sm+32);
|
|
|
|
ge25519_double_scalarmult_vartime(&get2, &get1, &schram, &ge25519_base, &scs);
|
|
ge25519_pack(t2, &get2);
|
|
|
|
ret = crypto_verify_32(sm, t2);
|
|
|
|
if (!ret)
|
|
{
|
|
for(i=0;i<smlen-64;i++)
|
|
m[i] = sm[i + 64];
|
|
*mlen = smlen-64;
|
|
}
|
|
else
|
|
{
|
|
for(i=0;i<smlen-64;i++)
|
|
m[i] = 0;
|
|
}
|
|
return ret;
|
|
}
|