C++ (Cpp) valid_iv_length Examples

Example #1

File: chacha.cpp Project: ChrisBFX/botan

void ChaCha::set_iv(const byte iv[], size_t length)
   {
   if(!valid_iv_length(length))
      throw Invalid_IV_Length(name(), length);

   m_state[12] = 0;
   m_state[13] = 0;

   if(length == 8)
      {
      m_state[14] = load_le<u32bit>(iv, 0);
      m_state[15] = load_le<u32bit>(iv, 1);
      }
   else if(length == 12)
      {
      m_state[13] = load_le<u32bit>(iv, 0);
      m_state[14] = load_le<u32bit>(iv, 1);
      m_state[15] = load_le<u32bit>(iv, 2);
      }

   chacha(m_buffer.data(), m_state.data());
   ++m_state[12];
   m_state[13] += (m_state[12] == 0);

   m_position = 0;
   }

Example #2

File: ofb.cpp Project: ChrisBFX/botan

void OFB::set_iv(const byte iv[], size_t iv_len)
   {
   if(!valid_iv_length(iv_len))
      throw Invalid_IV_Length(name(), iv_len);

   zeroise(m_buffer);
   buffer_insert(m_buffer, 0, iv, iv_len);

   m_cipher->encrypt(m_buffer);
   m_buf_pos = 0;
   }

Example #3

File: salsa20.cpp Project: fxdupont/botan

/*
* Set the Salsa IV
*/
void Salsa20::set_iv(const uint8_t iv[], size_t length)
   {
   if(!valid_iv_length(length))
      throw Invalid_IV_Length(name(), length);

   if(length == 0)
      {
      // Salsa20 null IV
      m_state[6] = 0;
      m_state[7] = 0;
      }
   else if(length == 8)
      {
      // Salsa20
      m_state[6] = load_le<uint32_t>(iv, 0);
      m_state[7] = load_le<uint32_t>(iv, 1);
      }
   else
      {
      // XSalsa20
      m_state[6] = load_le<uint32_t>(iv, 0);
      m_state[7] = load_le<uint32_t>(iv, 1);
      m_state[8] = load_le<uint32_t>(iv, 2);
      m_state[9] = load_le<uint32_t>(iv, 3);

      secure_vector<uint32_t> hsalsa(8);
      hsalsa20(hsalsa.data(), m_state.data());

      m_state[ 1] = hsalsa[0];
      m_state[ 2] = hsalsa[1];
      m_state[ 3] = hsalsa[2];
      m_state[ 4] = hsalsa[3];
      m_state[ 6] = load_le<uint32_t>(iv, 4);
      m_state[ 7] = load_le<uint32_t>(iv, 5);
      m_state[11] = hsalsa[4];
      m_state[12] = hsalsa[5];
      m_state[13] = hsalsa[6];
      m_state[14] = hsalsa[7];
      }

   m_state[8] = 0;
   m_state[9] = 0;

   salsa20(m_buffer.data(), m_state.data());
   ++m_state[8];
   m_state[9] += (m_state[8] == 0);

   m_position = 0;
   }

Example #4

File: stream_cipher.cpp Project: bsmr-c-cpp/botan

void StreamCipher::set_iv(const byte[], size_t iv_len)
   {
   if(!valid_iv_length(iv_len))
      throw Invalid_IV_Length(name(), iv_len);
   }