text: /*
  	100% free public domain implementation of the SHA-1
  	algorithm by Dominik Reichl <Dominik.Reichl@tiscali.de>
  
  	* modified by Trevor Hogan for use with GHost++ *
  
  	=== Test Vectors (from FIPS PUB 180-1) ===
  
  	"abc"
  		A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
  
  	"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
  		84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
  
  	A million repetitions of "a"
  		34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
  */
  
  
  #include "sha1.h"
  
  
  CSHA1::CSHA1()
  {
  	Reset();
  }
  
  CSHA1::~CSHA1()
  {
  	Reset();
  }
  
  
  void CSHA1::Reset()
  {
  	// SHA1 initialization constants
  	m_state[0] = 0x67452301;
  	m_state[1] = 0xEFCDAB89;
  	m_state[2] = 0x98BADCFE;
  	m_state[3] = 0x10325476;
  	m_state[4] = 0xC3D2E1F0;
  
  	m_count[0] = 0;
  	m_count[1] = 0;
  }
  
  void CSHA1::Transform(uint32_t state[5], unsigned char buffer[64])
  {
  	uint32_t a = 0, b = 0, c = 0, d = 0, e = 0;
  
  	SHA1_WORKSPACE_BLOCK* block;
  	static unsigned char workspace[64];
  	block = (SHA1_WORKSPACE_BLOCK *)workspace;
  	memcpy(block, buffer, 64);
  
  	// Copy state[] to working vars
  	a = state[0];
  	b = state[1];
  	c = state[2];
  	d = state[3];
  	e = state[4];
  
  	// 4 rounds of 20 operations each. Loop unrolled.
  	R0(a,b,c,d,e, 0); R0(e,a,b,c,d, 1); R0(d,e,a,b,c, 2); R0(c,d,e,a,b, 3);
  	R0(b,c,d,e,a, 4); R0(a,b,c,d,e, 5); R0(e,a,b,c,d, 6); R0(d,e,a,b,c, 7);
  	R0(c,d,e,a,b, 8); R0(b,c,d,e,a, 9); R0(a,b,c,d,e,10); R0(e,a,b,c,d,11);
  	R0(d,e,a,b,c,12); R0(c,d,e,a,b,13); R0(b,c,d,e,a,14); R0(a,b,c,d,e,15);
  	R1(e,a,b,c,d,16); R1(d,e,a,b,c,17); R1(c,d,e,a,b,18); R1(b,c,d,e,a,19);
  	R2(a,b,c,d,e,20); R2(e,a,b,c,d,21); R2(d,e,a,b,c,22); R2(c,d,e,a,b,23);
  	R2(b,c,d,e,a,24); R2(a,b,c,d,e,25); R2(e,a,b,c,d,26); R2(d,e,a,b,c,27);
  	R2(c,d,e,a,b,28); R2(b,c,d,e,a,29); R2(a,b,c,d,e,30); R2(e,a,b,c,d,31);
  	R2(d,e,a,b,c,32); R2(c,d,e,a,b,33); R2(b,c,d,e,a,34); R2(a,b,c,d,e,35);
  	R2(e,a,b,c,d,36); R2(d,e,a,b,c,37); R2(c,d,e,a,b,38); R2(b,c,d,e,a,39);
  	R3(a,b,c,d,e,40); R3(e,a,b,c,d,41); R3(d,e,a,b,c,42); R3(c,d,e,a,b,43);
  	R3(b,c,d,e,a,44); R3(a,b,c,d,e,45); R3(e,a,b,c,d,46); R3(d,e,a,b,c,47);
  	R3(c,d,e,a,b,48); R3(b,c,d,e,a,49); R3(a,b,c,d,e,50); R3(e,a,b,c,d,51);
  	R3(d,e,a,b,c,52); R3(c,d,e,a,b,53); R3(b,c,d,e,a,54); R3(a,b,c,d,e,55);
  	R3(e,a,b,c,d,56); R3(d,e,a,b,c,57); R3(c,d,e,a,b,58); R3(b,c,d,e,a,59);
  	R4(a,b,c,d,e,60); R4(e,a,b,c,d,61); R4(d,e,a,b,c,62); R4(c,d,e,a,b,63);
  	R4(b,c,d,e,a,64); R4(a,b,c,d,e,65); R4(e,a,b,c,d,66); R4(d,e,a,b,c,67);
  	R4(c,d,e,a,b,68); R4(b,c,d,e,a,69); R4(a,b,c,d,e,70); R4(e,a,b,c,d,71);
  	R4(d,e,a,b,c,72); R4(c,d,e,a,b,73); R4(b,c,d,e,a,74); R4(a,b,c,d,e,75);
  	R4(e,a,b,c,d,76); R4(d,e,a,b,c,77); R4(c,d,e,a,b,78); R4(b,c,d,e,a,79);
  
  	// Add the working vars back into state[]
  	state[0] += a;
  	state[1] += b;
  	state[2] += c;
  	state[3] += d;
  	state[4] += e;
  
  	// Wipe variables
  	a = 0; b = 0; c = 0; d = 0; e = 0;
  }
  
  // Use this function to hash in binary data and strings
  void CSHA1::Update(unsigned char* data, unsigned int len)
  {
  	uint32_t i = 0, j = 0;
  
  	j = (m_count[0] >> 3) & 63;
  
  	if((m_count[0] += len << 3) < (len << 3)) m_count[1]++;
  
  	m_count[1] += (len >> 29);
  
  	if((j + len) > 63)
  	{
  		memcpy(&m_buffer[j], data, (i = 64 - j));
  		Transform(m_state, m_buffer);
  
  		for (; i+63 < len; i += 64)
  		{
  			Transform(m_state, &data[i]);
  		}
  
  		j = 0;
  	}
  	else i = 0;
  
  	memcpy(&m_buffer[j], &data[i], len - i);
  }
  
  void CSHA1::Final()
  {
  	uint32_t i = 0, j = 0;
  	unsigned char finalcount[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
  
  	for (i = 0; i < 8; i++)
  		finalcount[i] = (unsigned char)((m_count[(i >= 4 ? 0 : 1)]
  			>> ((3 - (i & 3)) * 8) ) & 255); // Endian independent
  
  	Update((unsigned char *)"\200", 1);
  
  	while ((m_count[0] & 504) != 448)
  		Update((unsigned char *)"\0", 1);
  
  	Update(finalcount, 8); // Cause a SHA1Transform()
  
  	for (i = 0; i < 20; i++)
  	{
  		m_digest[i] = (unsigned char)((m_state[i >> 2] >> ((3 - (i & 3)) * 8) ) & 255);
  	}
  
  	// Wipe variables for security reasons
  	i = 0; j = 0;
  	memset(m_buffer, 0, 64);
  	memset(m_state, 0, 20);
  	memset(m_count, 0, 8);
  	memset(finalcount, 0, 8);
  
  	Transform(m_state, m_buffer);
  }
  
  // Get the final hash as a pre-formatted string
  void CSHA1::ReportHash(char *szReport, unsigned char uReportType)
  {
  	/*
  
  	unsigned char i = 0;
  	char szTemp[4];
  
  	if(uReportType == REPORT_HEX)
  	{
  		sprintf(szTemp, "%02x", m_digest[0]);
  		strcat(szReport, szTemp);
  
  		for(i = 1; i < 20; i++)
  		{
  			sprintf(szTemp, "%02x", m_digest[i]);
  			strcat(szReport, szTemp);
  		}
  	}
  	else if(uReportType == REPORT_DIGIT)
  	{
  		sprintf(szTemp, "%u", m_digest[0]);
  		strcat(szReport, szTemp);
  
  		for(i = 1; i < 20; i++)
  		{
  			sprintf(szTemp, " %u", m_digest[i]);
  			strcat(szReport, szTemp);
  		}
  	}
  	else strcpy(szReport, "Error: Unknown report type!");
  
  	*/
  }
  
  // Get the raw message digest
  void CSHA1::GetHash(unsigned char *uDest)
  {
  	memcpy(uDest, m_digest, 20);
  }
  