Sha256: de3b8f3ef6dd20b1d4b8a47b56d63f2b24db04e8a9c48feec79ddd89d167077f
Contents?: true
Size: 1019 Bytes
Versions: 10
Compression:
Stored size: 1019 Bytes
Contents
/*
version 20080913
D. J. Bernstein
Public domain.
*/
#include "api.h"
#include "crypto_core_salsa208.h"
typedef unsigned int uint32;
static const unsigned char sigma[16] = {
'e', 'x', 'p', 'a', 'n', 'd', ' ', '3', '2', '-', 'b', 'y', 't', 'e', ' ', 'k'
};
int crypto_stream_xor(
unsigned char *c,
const unsigned char *m,unsigned long long mlen,
const unsigned char *n,
const unsigned char *k
)
{
unsigned char in[16];
unsigned char block[64];
unsigned long long i;
unsigned int u;
if (!mlen) return 0;
for (i = 0;i < 8;++i) in[i] = n[i];
for (i = 8;i < 16;++i) in[i] = 0;
while (mlen >= 64) {
crypto_core_salsa208(block,in,k,sigma);
for (i = 0;i < 64;++i) c[i] = m[i] ^ block[i];
u = 1;
for (i = 8;i < 16;++i) {
u += (unsigned int) in[i];
in[i] = u;
u >>= 8;
}
mlen -= 64;
c += 64;
m += 64;
}
if (mlen) {
crypto_core_salsa208(block,in,k,sigma);
for (i = 0;i < mlen;++i) c[i] = m[i] ^ block[i];
}
return 0;
}
Version data entries
10 entries across 10 versions & 1 rubygems