-rw-r--r-- 816 saferewrite-20210915/src/encode_761x4591/ref/Encode.c
#include "Encode.h"
#include "crypto_uint32.h"
#define uint16 crypto_uint16
#define uint32 crypto_uint32
/* 0 <= R[i] < M[i] < 16384 */
void Encode(unsigned char *out,const uint16 *R,const uint16 *M,long long len)
{
if (len == 1) {
uint16 r = R[0];
uint16 m = M[0];
while (m > 1) {
*out++ = r;
r >>= 8;
m = (m+255)>>8;
}
}
if (len > 1) {
uint16 R2[(len+1)/2];
uint16 M2[(len+1)/2];
long long i;
for (i = 0;i < len-1;i += 2) {
uint32 m0 = M[i];
uint32 r = R[i]+R[i+1]*m0;
uint32 m = M[i+1]*m0;
while (m >= 16384) {
*out++ = r;
r >>= 8;
m = (m+255)>>8;
}
R2[i/2] = r;
M2[i/2] = m;
}
if (i < len) {
R2[i/2] = R[i];
M2[i/2] = M[i];
}
Encode(out,R2,M2,(len+1)/2);
}
}