Exemplos de crypto_core_salsa2012 em C++ (Cpp)

Exemplo n.º 1

Arquivo: xor_salsa2012.c Projeto: jedisct1/libsodium

int
crypto_stream_salsa2012_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 char kcopy[32];
    unsigned int  i;
    unsigned int  u;

    if (!mlen) {
        return 0;
    }
    for (i = 0; i < 32; ++i) {
        kcopy[i] = k[i];
    }
    for (i = 0; i < 8; ++i) {
        in[i] = n[i];
    }
    for (i = 8; i < 16; ++i) {
        in[i] = 0;
    }
    while (mlen >= 64) {
        crypto_core_salsa2012(block, in, kcopy, NULL);
        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_salsa2012(block, in, kcopy, NULL);
        for (i = 0; i < (unsigned int)mlen; ++i) {
            c[i] = m[i] ^ block[i];
        }
    }
    sodium_memzero(block, sizeof block);
    sodium_memzero(kcopy, sizeof kcopy);

    return 0;
}

Exemplo n.º 2

Arquivo: stream_salsa2012.c Projeto: 0njzy0/shadowsocks-libev

int crypto_stream_salsa2012(
        unsigned char *c,unsigned long long clen,
  const unsigned char *n,
  const unsigned char *k
)
{
  unsigned char in[16];
  unsigned char block[64];
  unsigned char kcopy[32];
  unsigned int i;
  unsigned int u;

  if (!clen) return 0;

  for (i = 0;i < 32;++i) kcopy[i] = k[i];
  for (i = 0;i < 8;++i) in[i] = n[i];
  for (i = 8;i < 16;++i) in[i] = 0;

  while (clen >= 64) {
    crypto_core_salsa2012(c,in,kcopy,sigma);

    u = 1;
    for (i = 8;i < 16;++i) {
      u += (unsigned int) in[i];
      in[i] = u;
      u >>= 8;
    }

    clen -= 64;
    c += 64;
  }

  if (clen) {
    crypto_core_salsa2012(block,in,kcopy,sigma);
    for (i = 0;i < (unsigned int) clen;++i) c[i] = block[i];
  }
  sodium_memzero(block, sizeof block);
  sodium_memzero(kcopy, sizeof kcopy);

  return 0;
}

Exemplo n.º 3

Arquivo: xor_salsa2012.c Projeto: FauxFaux/libsodium

int crypto_stream_xor(
        unsigned char *c,
  const unsigned char *m,uint64_t mlen,
  const unsigned char *n,
  const unsigned char *k
)
{
  unsigned char in[16];
  unsigned char block[64];
  uint64_t 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_salsa2012(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_salsa2012(block,in,k,sigma);
    for (i = 0;i < mlen;++i) c[i] = m[i] ^ block[i];
  }
  return 0;
}