/* * OctetString * (C) 1999-2007 Jack Lloyd * * Botan is released under the Simplified BSD License (see license.txt) */ #include <botan/symkey.h> #include <botan/rng.h> #include <botan/hex.h> #include <algorithm> namespace Botan { /* * Create an OctetString from RNG output */ OctetString::OctetString(RandomNumberGenerator& rng, size_t len) { m_data = rng.random_vec(len); } /* * Create an OctetString from a hex string */ OctetString::OctetString(const std::string& hex_string) { m_data.resize(1 + hex_string.length() / 2); m_data.resize(hex_decode(m_data.data(), hex_string)); } /* * Create an OctetString from a byte string */ OctetString::OctetString(const byte in[], size_t n) { m_data.assign(in, in + n); } /* * Set the parity of each key byte to odd */ void OctetString::set_odd_parity() { const byte ODD_PARITY[256] = { 0x01, 0x01, 0x02, 0x02, 0x04, 0x04, 0x07, 0x07, 0x08, 0x08, 0x0B, 0x0B, 0x0D, 0x0D, 0x0E, 0x0E, 0x10, 0x10, 0x13, 0x13, 0x15, 0x15, 0x16, 0x16, 0x19, 0x19, 0x1A, 0x1A, 0x1C, 0x1C, 0x1F, 0x1F, 0x20, 0x20, 0x23, 0x23, 0x25, 0x25, 0x26, 0x26, 0x29, 0x29, 0x2A, 0x2A, 0x2C, 0x2C, 0x2F, 0x2F, 0x31, 0x31, 0x32, 0x32, 0x34, 0x34, 0x37, 0x37, 0x38, 0x38, 0x3B, 0x3B, 0x3D, 0x3D, 0x3E, 0x3E, 0x40, 0x40, 0x43, 0x43, 0x45, 0x45, 0x46, 0x46, 0x49, 0x49, 0x4A, 0x4A, 0x4C, 0x4C, 0x4F, 0x4F, 0x51, 0x51, 0x52, 0x52, 0x54, 0x54, 0x57, 0x57, 0x58, 0x58, 0x5B, 0x5B, 0x5D, 0x5D, 0x5E, 0x5E, 0x61, 0x61, 0x62, 0x62, 0x64, 0x64, 0x67, 0x67, 0x68, 0x68, 0x6B, 0x6B, 0x6D, 0x6D, 0x6E, 0x6E, 0x70, 0x70, 0x73, 0x73, 0x75, 0x75, 0x76, 0x76, 0x79, 0x79, 0x7A, 0x7A, 0x7C, 0x7C, 0x7F, 0x7F, 0x80, 0x80, 0x83, 0x83, 0x85, 0x85, 0x86, 0x86, 0x89, 0x89, 0x8A, 0x8A, 0x8C, 0x8C, 0x8F, 0x8F, 0x91, 0x91, 0x92, 0x92, 0x94, 0x94, 0x97, 0x97, 0x98, 0x98, 0x9B, 0x9B, 0x9D, 0x9D, 0x9E, 0x9E, 0xA1, 0xA1, 0xA2, 0xA2, 0xA4, 0xA4, 0xA7, 0xA7, 0xA8, 0xA8, 0xAB, 0xAB, 0xAD, 0xAD, 0xAE, 0xAE, 0xB0, 0xB0, 0xB3, 0xB3, 0xB5, 0xB5, 0xB6, 0xB6, 0xB9, 0xB9, 0xBA, 0xBA, 0xBC, 0xBC, 0xBF, 0xBF, 0xC1, 0xC1, 0xC2, 0xC2, 0xC4, 0xC4, 0xC7, 0xC7, 0xC8, 0xC8, 0xCB, 0xCB, 0xCD, 0xCD, 0xCE, 0xCE, 0xD0, 0xD0, 0xD3, 0xD3, 0xD5, 0xD5, 0xD6, 0xD6, 0xD9, 0xD9, 0xDA, 0xDA, 0xDC, 0xDC, 0xDF, 0xDF, 0xE0, 0xE0, 0xE3, 0xE3, 0xE5, 0xE5, 0xE6, 0xE6, 0xE9, 0xE9, 0xEA, 0xEA, 0xEC, 0xEC, 0xEF, 0xEF, 0xF1, 0xF1, 0xF2, 0xF2, 0xF4, 0xF4, 0xF7, 0xF7, 0xF8, 0xF8, 0xFB, 0xFB, 0xFD, 0xFD, 0xFE, 0xFE }; for(size_t j = 0; j != m_data.size(); ++j) m_data[j] = ODD_PARITY[m_data[j]]; } /* * Hex encode an OctetString */ std::string OctetString::as_string() const { return hex_encode(m_data.data(), m_data.size()); } /* * XOR Operation for OctetStrings */ OctetString& OctetString::operator^=(const OctetString& k) { if(&k == this) { zeroise(m_data); return (*this); } xor_buf(m_data.data(), k.begin(), std::min(length(), k.length())); return (*this); } /* * Equality Operation for OctetStrings */ bool operator==(const OctetString& s1, const OctetString& s2) { return (s1.bits_of() == s2.bits_of()); } /* * Unequality Operation for OctetStrings */ bool operator!=(const OctetString& s1, const OctetString& s2) { return !(s1 == s2); } /* * Append Operation for OctetStrings */ OctetString operator+(const OctetString& k1, const OctetString& k2) { secure_vector<byte> out; out += k1.bits_of(); out += k2.bits_of(); return OctetString(out); } /* * XOR Operation for OctetStrings */ OctetString operator^(const OctetString& k1, const OctetString& k2) { secure_vector<byte> out(std::max(k1.length(), k2.length())); copy_mem(out.data(), k1.begin(), k1.length()); xor_buf(out.data(), k2.begin(), k2.length()); return OctetString(out); } }