/* * CrissCross * A multi-purpose cross-platform library. * * A product of Uplink Laboratories. * * (c) 2006-2008 Steven Noonan. * Licensed under the New BSD License. * */ #include #ifdef ENABLE_HASHES #include #include #define MD4_CTX cc_md4_ctx typedef unsigned char *POINTER; typedef const unsigned char *CONST_POINTER; /* Constants for MD4Transform routine. */ #define S11 3 #define S12 7 #define S13 11 #define S14 19 #define S21 3 #define S22 5 #define S23 9 #define S24 13 #define S31 3 #define S32 9 #define S33 11 #define S34 15 static void MD4Transform(cc_uint32_t [4], unsigned char [64]); static void Encode(unsigned char *, cc_uint32_t *, unsigned int); static void Decode(cc_uint32_t *, unsigned char *, unsigned int); static unsigned char PADDING[64] = { 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 }; /* F, G and H are basic MD4 functions. */ #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) /* ROTATE_LEFT rotates x left n bits. */ #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32 - (n)))) /* FF, GG and HH are transformations for rounds 1, 2 and 3 */ /* Rotation is separate from addition to prevent recomputation */ #define FF(a, b, c, d, x, s) { \ (a) += F((b), (c), (d)) + (x); \ (a) = ROTATE_LEFT((a), (s)); \ } #define GG(a, b, c, d, x, s) { \ (a) += G((b), (c), (d)) + (x) + (cc_uint32_t)0x5a827999; \ (a) = ROTATE_LEFT((a), (s)); \ } #define HH(a, b, c, d, x, s) { \ (a) += H((b), (c), (d)) + (x) + (cc_uint32_t)0x6ed9eba1; \ (a) = ROTATE_LEFT((a), (s)); \ } /* MD4 initialization. Begins an MD4 operation, writing a new context. */ /*************************************************************** * * Procedure MD4Init * ***************************************************************/ void MD4Init(MD4_CTX *context) { context->count[0] = context->count[1] = 0; /* Load magic initialization constants. */ context->state[0] = 0x67452301; context->state[1] = 0xefcdab89; context->state[2] = 0x98badcfe; context->state[3] = 0x10325476; } /* MD4 block update operation. Continues an MD4 message-digest * operation, processing another message block, and updating the * context. */ /*************************************************************** * * Procedure MD4Update * ***************************************************************/ void MD4Update(MD4_CTX *context, unsigned char *input, unsigned int inputLen) { unsigned int i, index, partLen; /* Compute number of bytes mod 64 */ index = (unsigned int)((context->count[0] >> 3) & 0x3F); /* Update number of bits */ if ((context->count[0] += ((cc_uint32_t)inputLen << 3)) < ((cc_uint32_t)inputLen << 3)) context->count[1]++; context->count[1] += ((cc_uint32_t)inputLen >> 29); partLen = 64 - index; /* Transform as many times as possible. */ if (inputLen >= partLen) { memcpy ((POINTER)&context->buffer[index], (POINTER)input, partLen); MD4Transform(context->state, context->buffer); for (i = partLen; i + 63 < inputLen; i += 64) MD4Transform(context->state, &input[i]); index = 0; } else i = 0; /* Buffer remaining input */ memcpy ((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen - i); } /* MD4 finalization. Ends an MD4 message-digest operation, writing the * the message digest and zeroizing the context. */ /*************************************************************** * * Procedure MD4Final * ***************************************************************/ void MD4Final(unsigned char digest[16], MD4_CTX *context) { unsigned char bits[8]; unsigned int index, padLen; /* Save number of bits */ Encode(bits, context->count, 8); /* Pad out to 56 mod 64. */ index = (unsigned int)((context->count[0] >> 3) & 0x3f); padLen = (index < 56) ? (56 - index) : (120 - index); MD4Update(context, PADDING, padLen); /* Append length (before padding) */ MD4Update(context, bits, 8); /* Store state in digest */ Encode(digest, context->state, 16); /* Zeroize sensitive information. */ memset((POINTER)context, 0, sizeof(*context)); } /* MD4 basic transformation. Transforms state based on block. */ /*************************************************************** * * Procedure MD4Transform * ***************************************************************/ static void MD4Transform(cc_uint32_t state[4], unsigned char block[64]) { cc_uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16]; Decode(x, block, 64); /* Round 1 */ FF(a, b, c, d, x[ 0], S11); /* 1 */ FF(d, a, b, c, x[ 1], S12); /* 2 */ FF(c, d, a, b, x[ 2], S13); /* 3 */ FF(b, c, d, a, x[ 3], S14); /* 4 */ FF(a, b, c, d, x[ 4], S11); /* 5 */ FF(d, a, b, c, x[ 5], S12); /* 6 */ FF(c, d, a, b, x[ 6], S13); /* 7 */ FF(b, c, d, a, x[ 7], S14); /* 8 */ FF(a, b, c, d, x[ 8], S11); /* 9 */ FF(d, a, b, c, x[ 9], S12); /* 10 */ FF(c, d, a, b, x[10], S13); /* 11 */ FF(b, c, d, a, x[11], S14); /* 12 */ FF(a, b, c, d, x[12], S11); /* 13 */ FF(d, a, b, c, x[13], S12); /* 14 */ FF(c, d, a, b, x[14], S13); /* 15 */ FF(b, c, d, a, x[15], S14); /* 16 */ /* Round 2 */ GG(a, b, c, d, x[ 0], S21); /* 17 */ GG(d, a, b, c, x[ 4], S22); /* 18 */ GG(c, d, a, b, x[ 8], S23); /* 19 */ GG(b, c, d, a, x[12], S24); /* 20 */ GG(a, b, c, d, x[ 1], S21); /* 21 */ GG(d, a, b, c, x[ 5], S22); /* 22 */ GG(c, d, a, b, x[ 9], S23); /* 23 */ GG(b, c, d, a, x[13], S24); /* 24 */ GG(a, b, c, d, x[ 2], S21); /* 25 */ GG(d, a, b, c, x[ 6], S22); /* 26 */ GG(c, d, a, b, x[10], S23); /* 27 */ GG(b, c, d, a, x[14], S24); /* 28 */ GG(a, b, c, d, x[ 3], S21); /* 29 */ GG(d, a, b, c, x[ 7], S22); /* 30 */ GG(c, d, a, b, x[11], S23); /* 31 */ GG(b, c, d, a, x[15], S24); /* 32 */ /* Round 3 */ HH(a, b, c, d, x[ 0], S31); /* 33 */ HH(d, a, b, c, x[ 8], S32); /* 34 */ HH(c, d, a, b, x[ 4], S33); /* 35 */ HH(b, c, d, a, x[12], S34); /* 36 */ HH(a, b, c, d, x[ 2], S31); /* 37 */ HH(d, a, b, c, x[10], S32); /* 38 */ HH(c, d, a, b, x[ 6], S33); /* 39 */ HH(b, c, d, a, x[14], S34); /* 40 */ HH(a, b, c, d, x[ 1], S31); /* 41 */ HH(d, a, b, c, x[ 9], S32); /* 42 */ HH(c, d, a, b, x[ 5], S33); /* 43 */ HH(b, c, d, a, x[13], S34); /* 44 */ HH(a, b, c, d, x[ 3], S31); /* 45 */ HH(d, a, b, c, x[11], S32); /* 46 */ HH(c, d, a, b, x[ 7], S33); /* 47 */ HH(b, c, d, a, x[15], S34); /* 48 */ state[0] += a; state[1] += b; state[2] += c; state[3] += d; /* Zeroize sensitive information. */ memset((POINTER)x, 0, sizeof(x)); } /* Encodes input (cc_uint32_t) into output (unsigned char). Assumes len is * a multiple of 4. */ /*************************************************************** * * Procedure Encode * ***************************************************************/ static void Encode(unsigned char *output, cc_uint32_t *input, unsigned int len) { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) { output[j] = (unsigned char)(input[i] & 0xff); output[j + 1] = (unsigned char)((input[i] >> 8) & 0xff); output[j + 2] = (unsigned char)((input[i] >> 16) & 0xff); output[j + 3] = (unsigned char)((input[i] >> 24) & 0xff); } } /* Decodes input (unsigned char) into output (cc_uint32_t). Assumes len is * a multiple of 4. */ /*************************************************************** * * Procedure Decode * ***************************************************************/ static void Decode(cc_uint32_t *output, unsigned char *input, unsigned int len) { unsigned int i, j; for (i = 0, j = 0; j < len; i++, j += 4) output[i] = ((cc_uint32_t)input[j]) | (((cc_uint32_t)input[j + 1]) << 8) | (((cc_uint32_t)input[j + 2]) << 16) | (((cc_uint32_t)input[j + 3]) << 24); } namespace CrissCross { namespace Crypto { MD4Hash::MD4Hash() : m_hashString(NULL), m_hash(NULL) { Reset(); } MD4Hash::~MD4Hash() { Reset(); } int MD4Hash::Process(const void * _data, size_t _length) { Reset(); if (!_data) return -1; MD4Update(&m_state, (unsigned char *)_data, _length); m_hash = new unsigned char[MD4_DIGEST_LENGTH]; MD4Final((unsigned char *)m_hash, &m_state); return 0; } int MD4Hash::Process(CrissCross::IO::CoreIOReader *_reader) { Reset(); if (!_reader) return -1; cc_int64_t pos = _reader->Position(); _reader->Seek(0); char buffer[8192]; int bytesRead = 0; do { bytesRead = _reader->Read(buffer, sizeof(buffer), 0, sizeof(buffer)); if (bytesRead >= 0) ProcessBlock(buffer, bytesRead); } while (bytesRead == sizeof(buffer) && !_reader->EndOfFile()); Finalize(); _reader->Seek(pos); return 0; } int MD4Hash::ProcessBlock(const void * _data, size_t _length) { if (!_data) return -1; MD4Update(&m_state, (unsigned char *)_data, _length); return 0; } void MD4Hash::Finalize() { if (m_hash) delete [] m_hash; m_hash = new unsigned char[MD4_DIGEST_LENGTH]; MD4Final((unsigned char *)m_hash, &m_state); } const char *MD4Hash::ToString() const { if (m_hashString) return m_hashString; m_hashString = new char[33]; for (int i = 0; i < MD4_DIGEST_LENGTH; i++) sprintf(m_hashString + (i * 2), "%02x", m_hash[i]); return m_hashString; } void MD4Hash::Reset() { delete [] m_hash; m_hash = NULL; delete [] m_hashString; m_hashString = NULL; MD4Init(&m_state); } bool MD4Hash::operator==(const MD4Hash &_other) const { return (memcmp(m_hash, _other.m_hash, MD4_DIGEST_LENGTH) == 0); } } } #endif