mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-21 05:53:09 +00:00
95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
#include "crypto_sign.h"
|
|
|
|
#include "crypto_verify_32.h"
|
|
#include "crypto_hash_sha512.h"
|
|
#include "randombytes.h"
|
|
|
|
#include "ge25519.h"
|
|
#include "hram.h"
|
|
|
|
#define MAXBATCH 64
|
|
|
|
int crypto_sign_open_batch(
|
|
unsigned char* const m[],unsigned long long mlen[],
|
|
unsigned char* const sm[],const unsigned long long smlen[],
|
|
unsigned char* const pk[],
|
|
unsigned long long num
|
|
)
|
|
{
|
|
int ret = 0;
|
|
unsigned long long i, j;
|
|
shortsc25519 r[MAXBATCH];
|
|
sc25519 scalars[2*MAXBATCH+1];
|
|
ge25519 points[2*MAXBATCH+1];
|
|
unsigned char hram[crypto_hash_sha512_BYTES];
|
|
unsigned long long batchsize;
|
|
|
|
for (i = 0;i < num;++i) mlen[i] = -1;
|
|
|
|
while (num >= 3) {
|
|
batchsize = num;
|
|
if (batchsize > MAXBATCH) batchsize = MAXBATCH;
|
|
|
|
for (i = 0;i < batchsize;++i)
|
|
if (smlen[i] < 64) goto fallback;
|
|
|
|
randombytes((unsigned char*)r,sizeof(shortsc25519) * batchsize);
|
|
|
|
/* Computing scalars[0] = ((r1s1 + r2s2 + ...)) */
|
|
for(i=0;i<batchsize;i++)
|
|
{
|
|
sc25519_from32bytes(&scalars[i], sm[i]+32);
|
|
sc25519_mul_shortsc(&scalars[i], &scalars[i], &r[i]);
|
|
}
|
|
for(i=1;i<batchsize;i++)
|
|
sc25519_add(&scalars[0], &scalars[0], &scalars[i]);
|
|
|
|
/* Computing scalars[1] ... scalars[batchsize] as r[i]*H(R[i],A[i],m[i]) */
|
|
for(i=0;i<batchsize;i++)
|
|
{
|
|
get_hram(hram, sm[i], pk[i], m[i], smlen[i]);
|
|
sc25519_from64bytes(&scalars[i+1],hram);
|
|
sc25519_mul_shortsc(&scalars[i+1],&scalars[i+1],&r[i]);
|
|
}
|
|
/* Setting scalars[batchsize+1] ... scalars[2*batchsize] to r[i] */
|
|
for(i=0;i<batchsize;i++)
|
|
sc25519_from_shortsc(&scalars[batchsize+i+1],&r[i]);
|
|
|
|
/* Computing points */
|
|
points[0] = ge25519_base;
|
|
|
|
for(i=0;i<batchsize;i++)
|
|
if (ge25519_unpackneg_vartime(&points[i+1], pk[i])) goto fallback;
|
|
for(i=0;i<batchsize;i++)
|
|
if (ge25519_unpackneg_vartime(&points[batchsize+i+1], sm[i])) goto fallback;
|
|
|
|
ge25519_multi_scalarmult_vartime(points, points, scalars, 2*batchsize+1);
|
|
|
|
if (ge25519_isneutral_vartime(points)) {
|
|
for(i=0;i<batchsize;i++)
|
|
{
|
|
for(j=0;j<smlen[i]-64;j++)
|
|
m[i][j] = sm[i][j + 64];
|
|
mlen[i] = smlen[i]-64;
|
|
}
|
|
} else {
|
|
fallback:
|
|
|
|
for (i = 0;i < batchsize;++i)
|
|
ret |= crypto_sign_open(m[i], &mlen[i], sm[i], smlen[i], pk[i]);
|
|
}
|
|
|
|
m += batchsize;
|
|
mlen += batchsize;
|
|
sm += batchsize;
|
|
smlen += batchsize;
|
|
pk += batchsize;
|
|
num -= batchsize;
|
|
}
|
|
|
|
for (i = 0;i < num;++i)
|
|
ret |= crypto_sign_open(m[i], &mlen[i], sm[i], smlen[i], pk[i]);
|
|
|
|
return ret;
|
|
}
|