[apt.git] / apt-pkg / contrib / sha1.cc

// -*- mode: cpp; mode: fold -*-
// Description                                                          /*{{{*/
// $Id: sha1.cc,v 1.3 2001/05/13 05:15:03 jgg Exp $
/* ######################################################################
   
   SHA1 - SHA-1 Secure Hash Algorithm.
   
   This file is a Public Domain wrapper for the Public Domain SHA1 
   calculation code that is at it's end.

   The algorithm was originally implemented by 
   Steve Reid <sreid@sea-to-sky.net> and later modified by 
   James H. Brown <jbrown@burgoyne.com>.
   
   Modifications for APT were done by Alfredo K. Kojima and Jason 
   Gunthorpe.
   
   Still in the public domain.
   
   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 Files                                                        /*{{{*/
#include <apt-pkg/sha1.h>
#include <apt-pkg/strutl.h>

#include <string.h>
#include <unistd.h>
#include <inttypes.h>
#include <config.h>
#include <system.h>
									/*}}}*/

// SHA1Transform - Alters an existing SHA-1 hash			/*{{{*/
// ---------------------------------------------------------------------
/* The core of the SHA-1 algorithm. This alters an existing SHA-1 hash to
   reflect the addition of 16 longwords of new data. Other routines convert
   incoming stream data into 16 long word chunks for this routine */

#define rol(value,bits) (((value) << (bits)) | ((value) >> (32 - (bits))))

/* blk0() and blk() perform the initial expand. */
/* I got the idea of expanding during the round function from SSLeay */
#ifndef WORDS_BIGENDIAN
#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
    |(rol(block->l[i],8)&0x00FF00FF))
#else
#define blk0(i) block->l[i]
#endif
#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
    ^block->l[(i+2)&15]^block->l[i&15],1))

/* (R0+R1),R2,R3,R4 are the different operations used in SHA1 */
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
#define R3(v,w,x,y,z,i) z+=(((w|x)&y)|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);

static void SHA1Transform(uint32_t state[5],uint8_t const buffer[64])
{
   uint32_t a,b,c,d,e;
   typedef union
   {
      uint8_t c[64];
      uint32_t l[16];
   }
   CHAR64LONG16;
   CHAR64LONG16 *block;

   uint8_t workspace[64];
   block = (CHAR64LONG16 *)workspace;
   memcpy(block,buffer,sizeof(workspace));

   /* Copy context->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 context.state[] */
   state[0] += a;
   state[1] += b;
   state[2] += c;
   state[3] += d;
   state[4] += e;   
}
									/*}}}*/

// SHA1SumValue::SHA1SumValue - Constructs the summation from a string  /*{{{*/
// ---------------------------------------------------------------------
/* The string form of a SHA1 is a 40 character hex number */
SHA1SumValue::SHA1SumValue(string Str)
{
   memset(Sum,0,sizeof(Sum));
   Set(Str);
}

									/*}}} */
// SHA1SumValue::SHA1SumValue - Default constructor                     /*{{{*/
// ---------------------------------------------------------------------
/* Sets the value to 0 */
SHA1SumValue::SHA1SumValue()
{
   memset(Sum,0,sizeof(Sum));
}

									/*}}} */
// SHA1SumValue::Set - Set the sum from a string                        /*{{{*/
// ---------------------------------------------------------------------
/* Converts the hex string into a set of chars */
bool SHA1SumValue::Set(string Str)
{
   return Hex2Num(Str,Sum,sizeof(Sum));
}

									/*}}} */
// SHA1SumValue::Value - Convert the number into a string               /*{{{*/
// ---------------------------------------------------------------------
/* Converts the set of chars into a hex string in lower case */
string SHA1SumValue::Value() const
{
   char Conv[16] =
      { '0','1','2','3','4','5','6','7','8','9','a','b',
      'c','d','e','f'
   };
   char Result[41];
   Result[40] = 0;

   // Convert each char into two letters
   int J = 0;
   int I = 0;
   for (; I != 40; J++,I += 2)
   {
      Result[I] = Conv[Sum[J] >> 4];
      Result[I + 1] = Conv[Sum[J] & 0xF];
   }

   return string(Result);
}

									/*}}} */
// SHA1SumValue::operator == - Comparator                               /*{{{*/
// ---------------------------------------------------------------------
/* Call memcmp on the buffer */
bool SHA1SumValue::operator == (const SHA1SumValue & rhs) const
{
   return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
}
									/*}}}*/
// SHA1Summation::SHA1Summation - Constructor                           /*{{{*/
// ---------------------------------------------------------------------
/* */
SHA1Summation::SHA1Summation()
{
   uint32_t *state = (uint32_t *)State;
   uint32_t *count = (uint32_t *)Count;
   
   /* SHA1 initialization constants */
   state[0] = 0x67452301;
   state[1] = 0xEFCDAB89;
   state[2] = 0x98BADCFE;
   state[3] = 0x10325476;
   state[4] = 0xC3D2E1F0;
   count[0] = 0;
   count[1] = 0;
   Done = false;
}
									/*}}}*/
// SHA1Summation::Result - Return checksum value                        /*{{{*/
// ---------------------------------------------------------------------
/* Add() may not be called after this */
SHA1SumValue SHA1Summation::Result()
{
   uint32_t *state = (uint32_t *)State;
   uint32_t *count = (uint32_t *)Count;
   
   // Apply the padding
   if (Done == false)
   {
      unsigned char finalcount[8];

      for (unsigned i = 0; i < 8; i++)
      {
	 // Endian independent
	 finalcount[i] = (unsigned char) ((count[(i >= 4 ? 0 : 1)]
					   >> ((3 - (i & 3)) * 8)) & 255);	
      }
      
      Add((unsigned char *) "\200",1);
      while ((count[0] & 504) != 448)
	 Add((unsigned char *) "\0",1);
      
      Add(finalcount,8);	/* Should cause a SHA1Transform() */
      
   }

   Done = true;

   // Transfer over the result
   SHA1SumValue Value;
   for (unsigned i = 0; i < 20; i++)
   {
      Value.Sum[i] = (unsigned char)
	 ((state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
   }
   return Value;
}
									/*}}}*/
// SHA1Summation::Add - Adds content of buffer into the checksum        /*{{{*/
// ---------------------------------------------------------------------
/* May not be called after Result() is called */
bool SHA1Summation::Add(const unsigned char *data,unsigned long len)
{
   if (Done)
      return false;

   uint32_t *state = (uint32_t *)State;
   uint32_t *count = (uint32_t *)Count;
   uint8_t *buffer = (uint8_t *)Buffer;
   uint32_t i,j;

   j = (count[0] >> 3) & 63;
   if ((count[0] += len << 3) < (len << 3))
      count[1]++;
   count[1] += (len >> 29);
   if ((j + len) > 63)
   {
      memcpy(&buffer[j],data,(i = 64 - j));
      SHA1Transform(state,buffer);
      for (; i + 63 < len; i += 64)
      {
	 SHA1Transform(state,&data[i]);
      }
      j = 0;
   }
   else
      i = 0;
   memcpy(&buffer[j],&data[i],len - i);
   
   return true;
}
									/*}}}*/
// SHA1Summation::AddFD - Add content of file into the checksum         /*{{{*/
// ---------------------------------------------------------------------
/* */
bool SHA1Summation::AddFD(int Fd,unsigned long Size)
{
   unsigned char Buf[64 * 64];
   int Res = 0;
   int ToEOF = (Size == 0);
   while (Size != 0 || ToEOF)
   {
      unsigned n = sizeof(Buf);
      if (!ToEOF) n = min(Size,(unsigned long)n);
      Res = read(Fd,Buf,n);
      if (Res < 0 || (!ToEOF && (unsigned) Res != n)) // error, or short read
	 return false;
      if (ToEOF && Res == 0) // EOF
         break;
      Size -= Res;
      Add(Buf,Res);
   }
   return true;
}
									/*}}}*/
Commit	Line	Data
784202a2 AL	1	// -- mode: cpp; mode: fold --
784202a2 AL	2	// Description /{{{/
c1ebf56d	3	// $Id: sha1.cc,v 1.3 2001/05/13 05:15:03 jgg Exp $
784202a2 AL	4	/* ######################################################################
	5
	6	SHA1 - SHA-1 Secure Hash Algorithm.
	7
	8	This file is a Public Domain wrapper for the Public Domain SHA1
	9	calculation code that is at it's end.
	10
	11	The algorithm was originally implemented by
	12	Steve Reid <sreid@sea-to-sky.net> and later modified by
	13	James H. Brown <jbrown@burgoyne.com>.
	14
	15	Modifications for APT were done by Alfredo K. Kojima and Jason
	16	Gunthorpe.
	17
	18	Still in the public domain.
	19
	20	Test Vectors (from FIPS PUB 180-1)
	21	"abc"
	22	A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D
	23	"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
	24	84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1
	25	A million repetitions of "a"
	26	34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
	27
	28	#####################################################################
	29	*/
	30	/}}} /
	31	// Include Files /{{{/
784202a2 AL	32	#include <apt-pkg/sha1.h>
	33	#include <apt-pkg/strutl.h>
	34
	35	#include <string.h>
	36	#include <unistd.h>
	37	#include <inttypes.h>
	38	#include <config.h>
	39	#include <system.h>
	40	/}}}/
	41
	42	// SHA1Transform - Alters an existing SHA-1 hash /{{{/
	43	// ---------------------------------------------------------------------
	44	/* The core of the SHA-1 algorithm. This alters an existing SHA-1 hash to
	45	reflect the addition of 16 longwords of new data. Other routines convert
	46	incoming stream data into 16 long word chunks for this routine */
	47
	48	#define rol(value,bits) (((value) << (bits)) \| ((value) >> (32 - (bits))))
	49
	50	/* blk0() and blk() perform the initial expand. */
	51	/* I got the idea of expanding during the round function from SSLeay */
	52	#ifndef WORDS_BIGENDIAN
	53	#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
	54	\|(rol(block->l[i],8)&0x00FF00FF))
	55	#else
	56	#define blk0(i) block->l[i]
	57	#endif
	58	#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
	59	^block->l[(i+2)&15]^block->l[i&15],1))
	60
	61	/* (R0+R1),R2,R3,R4 are the different operations used in SHA1 */
	62	#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
	63	#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
	64	#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
	65	#define R3(v,w,x,y,z,i) z+=(((w\|x)&y)\|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
	66	#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
	67
	68	static void SHA1Transform(uint32_t state[5],uint8_t const buffer[64])
	69	{
	70	uint32_t a,b,c,d,e;
	71	typedef union
	72	{
	73	uint8_t c[64];
	74	uint32_t l[16];
	75	}
	76	CHAR64LONG16;
	77	CHAR64LONG16 *block;
	78
	79	uint8_t workspace[64];
	80	block = (CHAR64LONG16 *)workspace;
	81	memcpy(block,buffer,sizeof(workspace));
	82
	83	/* Copy context->state[] to working vars */
	84	a = state[0];
	85	b = state[1];
	86	c = state[2];
	87	d = state[3];
	88	e = state[4];
	89
	90	/* 4 rounds of 20 operations each. Loop unrolled. */
	91	R0(a,b,c,d,e,0);
	92	R0(e,a,b,c,d,1);
	93	R0(d,e,a,b,c,2);
	94	R0(c,d,e,a,b,3);
	95	R0(b,c,d,e,a,4);
96	R0(a,b,c,d,e,5);
97	R0(e,a,b,c,d,6);
98	R0(d,e,a,b,c,7);
99	R0(c,d,e,a,b,8);
100	R0(b,c,d,e,a,9);
101	R0(a,b,c,d,e,10);
102	R0(e,a,b,c,d,11);
103	R0(d,e,a,b,c,12);
104	R0(c,d,e,a,b,13);
105	R0(b,c,d,e,a,14);
106	R0(a,b,c,d,e,15);
107	R1(e,a,b,c,d,16);
108	R1(d,e,a,b,c,17);
109	R1(c,d,e,a,b,18);
110	R1(b,c,d,e,a,19);
111	R2(a,b,c,d,e,20);
112	R2(e,a,b,c,d,21);
113	R2(d,e,a,b,c,22);
114	R2(c,d,e,a,b,23);
115	R2(b,c,d,e,a,24);
116	R2(a,b,c,d,e,25);
117	R2(e,a,b,c,d,26);
118	R2(d,e,a,b,c,27);
119	R2(c,d,e,a,b,28);
120	R2(b,c,d,e,a,29);
121	R2(a,b,c,d,e,30);
122	R2(e,a,b,c,d,31);
123	R2(d,e,a,b,c,32);
124	R2(c,d,e,a,b,33);
125	R2(b,c,d,e,a,34);
126	R2(a,b,c,d,e,35);
127	R2(e,a,b,c,d,36);
128	R2(d,e,a,b,c,37);
129	R2(c,d,e,a,b,38);
130	R2(b,c,d,e,a,39);
131	R3(a,b,c,d,e,40);
132	R3(e,a,b,c,d,41);
133	R3(d,e,a,b,c,42);
134	R3(c,d,e,a,b,43);
135	R3(b,c,d,e,a,44);
136	R3(a,b,c,d,e,45);
137	R3(e,a,b,c,d,46);
138	R3(d,e,a,b,c,47);
139	R3(c,d,e,a,b,48);
140	R3(b,c,d,e,a,49);
141	R3(a,b,c,d,e,50);
142	R3(e,a,b,c,d,51);
143	R3(d,e,a,b,c,52);
144	R3(c,d,e,a,b,53);
145	R3(b,c,d,e,a,54);
146	R3(a,b,c,d,e,55);
147	R3(e,a,b,c,d,56);
148	R3(d,e,a,b,c,57);
149	R3(c,d,e,a,b,58);
150	R3(b,c,d,e,a,59);
151	R4(a,b,c,d,e,60);
152	R4(e,a,b,c,d,61);
153	R4(d,e,a,b,c,62);
154	R4(c,d,e,a,b,63);
155	R4(b,c,d,e,a,64);
156	R4(a,b,c,d,e,65);
157	R4(e,a,b,c,d,66);
158	R4(d,e,a,b,c,67);
159	R4(c,d,e,a,b,68);
160	R4(b,c,d,e,a,69);
161	R4(a,b,c,d,e,70);
162	R4(e,a,b,c,d,71);
163	R4(d,e,a,b,c,72);
164	R4(c,d,e,a,b,73);
165	R4(b,c,d,e,a,74);
166	R4(a,b,c,d,e,75);
167	R4(e,a,b,c,d,76);
168	R4(d,e,a,b,c,77);
169	R4(c,d,e,a,b,78);
170	R4(b,c,d,e,a,79);
171
172	/* Add the working vars back into context.state[] */
173	state[0] += a;
174	state[1] += b;
175	state[2] += c;
176	state[3] += d;
177	state[4] += e;
178	}
179	/}}}/
180
181	// SHA1SumValue::SHA1SumValue - Constructs the summation from a string /{{{/
182	// ---------------------------------------------------------------------
183	/* The string form of a SHA1 is a 40 character hex number */
184	SHA1SumValue::SHA1SumValue(string Str)
185	{
186	memset(Sum,0,sizeof(Sum));
187	Set(Str);
188	}
189
190	/}}} /
191	// SHA1SumValue::SHA1SumValue - Default constructor /{{{/
192	// ---------------------------------------------------------------------
193	/* Sets the value to 0 */
194	SHA1SumValue::SHA1SumValue()
195	{
196	memset(Sum,0,sizeof(Sum));
197	}
198
199	/}}} /
200	// SHA1SumValue::Set - Set the sum from a string /{{{/
201	// ---------------------------------------------------------------------
202	/* Converts the hex string into a set of chars */
203	bool SHA1SumValue::Set(string Str)
204	{
c1ebf56d	205	return Hex2Num(Str,Sum,sizeof(Sum));
784202a2 AL	206	}
	207
	208	/}}} /
	209	// SHA1SumValue::Value - Convert the number into a string /{{{/
	210	// ---------------------------------------------------------------------
	211	/* Converts the set of chars into a hex string in lower case */
	212	string SHA1SumValue::Value() const
	213	{
	214	char Conv[16] =
	215	{ '0','1','2','3','4','5','6','7','8','9','a','b',
	216	'c','d','e','f'
	217	};
	218	char Result[41];
	219	Result[40] = 0;
	220
	221	// Convert each char into two letters
	222	int J = 0;
	223	int I = 0;
	224	for (; I != 40; J++,I += 2)
	225	{
	226	Result[I] = Conv[Sum[J] >> 4];
	227	Result[I + 1] = Conv[Sum[J] & 0xF];
	228	}
	229
	230	return string(Result);
	231	}
	232
	233	/}}} /
	234	// SHA1SumValue::operator == - Comparator /{{{/
	235	// ---------------------------------------------------------------------
	236	/* Call memcmp on the buffer */
	237	bool SHA1SumValue::operator == (const SHA1SumValue & rhs) const
	238	{
	239	return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
	240	}
	241	/}}}/
	242	// SHA1Summation::SHA1Summation - Constructor /{{{/
	243	// ---------------------------------------------------------------------
	244	/* */
	245	SHA1Summation::SHA1Summation()
	246	{
	247	uint32_t state = (uint32_t )State;
	248	uint32_t count = (uint32_t )Count;
	249
	250	/* SHA1 initialization constants */
	251	state[0] = 0x67452301;
	252	state[1] = 0xEFCDAB89;
	253	state[2] = 0x98BADCFE;
	254	state[3] = 0x10325476;
	255	state[4] = 0xC3D2E1F0;
	256	count[0] = 0;
	257	count[1] = 0;
	258	Done = false;
	259	}
	260	/}}}/
	261	// SHA1Summation::Result - Return checksum value /{{{/
	262	// ---------------------------------------------------------------------
	263	/* Add() may not be called after this */
	264	SHA1SumValue SHA1Summation::Result()
	265	{
	266	uint32_t state = (uint32_t )State;
	267	uint32_t count = (uint32_t )Count;
784202a2 AL	268
	269	// Apply the padding
	270	if (Done == false)
	271	{
	272	unsigned char finalcount[8];
	273
	274	for (unsigned i = 0; i < 8; i++)
	275	{
	276	// Endian independent
	277	finalcount[i] = (unsigned char) ((count[(i >= 4 ? 0 : 1)]
	278	>> ((3 - (i & 3)) * 8)) & 255);
	279	}
	280
	281	Add((unsigned char *) "\200",1);
	282	while ((count[0] & 504) != 448)
	283	Add((unsigned char *) "\0",1);
	284
	285	Add(finalcount,8); /* Should cause a SHA1Transform() */
	286
	287	}
	288
	289	Done = true;
	290
	291	// Transfer over the result
	292	SHA1SumValue Value;
	293	for (unsigned i = 0; i < 20; i++)
	294	{
	295	Value.Sum[i] = (unsigned char)
	296	((state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
	297	}
	298	return Value;
	299	}
	300	/}}}/
	301	// SHA1Summation::Add - Adds content of buffer into the checksum /{{{/
	302	// ---------------------------------------------------------------------
	303	/* May not be called after Result() is called */
	304	bool SHA1Summation::Add(const unsigned char *data,unsigned long len)
	305	{
	306	if (Done)
	307	return false;
	308
	309	uint32_t state = (uint32_t )State;
	310	uint32_t count = (uint32_t )Count;
	311	uint8_t buffer = (uint8_t )Buffer;
	312	uint32_t i,j;
	313
	314	j = (count[0] >> 3) & 63;
	315	if ((count[0] += len << 3) < (len << 3))
	316	count[1]++;
	317	count[1] += (len >> 29);
	318	if ((j + len) > 63)
	319	{
	320	memcpy(&buffer[j],data,(i = 64 - j));
	321	SHA1Transform(state,buffer);
	322	for (; i + 63 < len; i += 64)
	323	{
	324	SHA1Transform(state,&data[i]);
	325	}
	326	j = 0;
	327	}
	328	else
	329	i = 0;
	330	memcpy(&buffer[j],&data[i],len - i);
	331
332	return true;
333	}
334	/}}}/
335	// SHA1Summation::AddFD - Add content of file into the checksum /{{{/
336	// ---------------------------------------------------------------------
337	/* */
338	bool SHA1Summation::AddFD(int Fd,unsigned long Size)
339	{
340	unsigned char Buf[64 * 64];
341	int Res = 0;
dc50285d	342	int ToEOF = (Size == 0);
879cd3ad	343	while (Size != 0 \|\| ToEOF)
784202a2	344	{
879cd3ad	345	unsigned n = sizeof(Buf);
42ab8223	346	if (!ToEOF) n = min(Size,(unsigned long)n);
dc50285d MZ	347	Res = read(Fd,Buf,n);
dc50285d MZ	348	if (Res < 0 \|\| (!ToEOF && (unsigned) Res != n)) // error, or short read
784202a2	349	return false;
dc50285d MZ	350	if (ToEOF && Res == 0) // EOF
dc50285d MZ	351	break;
784202a2 AL	352	Size -= Res;
	353	Add(Buf,Res);
	354	}
	355	return true;
	356	}
	357	/}}}/