[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                                                        /*{{{*/
#ifdef __GNUG__
#pragma implementation "apt-pkg/sha1.h"
#endif

#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,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 /{{{/
	32	#ifdef __GNUG__
	33	#pragma implementation "apt-pkg/sha1.h"
	34	#endif
	35
	36	#include <apt-pkg/sha1.h>
	37	#include <apt-pkg/strutl.h>
	38
	39	#include <string.h>
	40	#include <unistd.h>
	41	#include <inttypes.h>
	42	#include <config.h>
	43	#include <system.h>
	44	/}}}/
	45
	46	// SHA1Transform - Alters an existing SHA-1 hash /{{{/
	47	// ---------------------------------------------------------------------
	48	/* The core of the SHA-1 algorithm. This alters an existing SHA-1 hash to
	49	reflect the addition of 16 longwords of new data. Other routines convert
	50	incoming stream data into 16 long word chunks for this routine */
	51
	52	#define rol(value,bits) (((value) << (bits)) \| ((value) >> (32 - (bits))))
	53
	54	/* blk0() and blk() perform the initial expand. */
	55	/* I got the idea of expanding during the round function from SSLeay */
	56	#ifndef WORDS_BIGENDIAN
	57	#define blk0(i) (block->l[i] = (rol(block->l[i],24)&0xFF00FF00) \
	58	\|(rol(block->l[i],8)&0x00FF00FF))
	59	#else
	60	#define blk0(i) block->l[i]
	61	#endif
	62	#define blk(i) (block->l[i&15] = rol(block->l[(i+13)&15]^block->l[(i+8)&15] \
	63	^block->l[(i+2)&15]^block->l[i&15],1))
	64
	65	/* (R0+R1),R2,R3,R4 are the different operations used in SHA1 */
	66	#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
	67	#define R1(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk(i)+0x5A827999+rol(v,5);w=rol(w,30);
68	#define R2(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0x6ED9EBA1+rol(v,5);w=rol(w,30);
69	#define R3(v,w,x,y,z,i) z+=(((w\|x)&y)\|(w&x))+blk(i)+0x8F1BBCDC+rol(v,5);w=rol(w,30);
70	#define R4(v,w,x,y,z,i) z+=(w^x^y)+blk(i)+0xCA62C1D6+rol(v,5);w=rol(w,30);
71
72	static void SHA1Transform(uint32_t state[5],uint8_t const buffer[64])
73	{
74	uint32_t a,b,c,d,e;
75	typedef union
76	{
77	uint8_t c[64];
78	uint32_t l[16];
79	}
80	CHAR64LONG16;
81	CHAR64LONG16 *block;
82
83	uint8_t workspace[64];
84	block = (CHAR64LONG16 *)workspace;
85	memcpy(block,buffer,sizeof(workspace));
86
87	/* Copy context->state[] to working vars */
88	a = state[0];
89	b = state[1];
90	c = state[2];
91	d = state[3];
92	e = state[4];
93
94	/* 4 rounds of 20 operations each. Loop unrolled. */
95	R0(a,b,c,d,e,0);
96	R0(e,a,b,c,d,1);
97	R0(d,e,a,b,c,2);
98	R0(c,d,e,a,b,3);
99	R0(b,c,d,e,a,4);
100	R0(a,b,c,d,e,5);
101	R0(e,a,b,c,d,6);
102	R0(d,e,a,b,c,7);
103	R0(c,d,e,a,b,8);
104	R0(b,c,d,e,a,9);
105	R0(a,b,c,d,e,10);
106	R0(e,a,b,c,d,11);
107	R0(d,e,a,b,c,12);
108	R0(c,d,e,a,b,13);
109	R0(b,c,d,e,a,14);
110	R0(a,b,c,d,e,15);
111	R1(e,a,b,c,d,16);
112	R1(d,e,a,b,c,17);
113	R1(c,d,e,a,b,18);
114	R1(b,c,d,e,a,19);
115	R2(a,b,c,d,e,20);
116	R2(e,a,b,c,d,21);
117	R2(d,e,a,b,c,22);
118	R2(c,d,e,a,b,23);
119	R2(b,c,d,e,a,24);
120	R2(a,b,c,d,e,25);
121	R2(e,a,b,c,d,26);
122	R2(d,e,a,b,c,27);
123	R2(c,d,e,a,b,28);
124	R2(b,c,d,e,a,29);
125	R2(a,b,c,d,e,30);
126	R2(e,a,b,c,d,31);
127	R2(d,e,a,b,c,32);
128	R2(c,d,e,a,b,33);
129	R2(b,c,d,e,a,34);
130	R2(a,b,c,d,e,35);
131	R2(e,a,b,c,d,36);
132	R2(d,e,a,b,c,37);
133	R2(c,d,e,a,b,38);
134	R2(b,c,d,e,a,39);
135	R3(a,b,c,d,e,40);
136	R3(e,a,b,c,d,41);
137	R3(d,e,a,b,c,42);
138	R3(c,d,e,a,b,43);
139	R3(b,c,d,e,a,44);
140	R3(a,b,c,d,e,45);
141	R3(e,a,b,c,d,46);
142	R3(d,e,a,b,c,47);
143	R3(c,d,e,a,b,48);
144	R3(b,c,d,e,a,49);
145	R3(a,b,c,d,e,50);
146	R3(e,a,b,c,d,51);
147	R3(d,e,a,b,c,52);
148	R3(c,d,e,a,b,53);
149	R3(b,c,d,e,a,54);
150	R3(a,b,c,d,e,55);
151	R3(e,a,b,c,d,56);
152	R3(d,e,a,b,c,57);
153	R3(c,d,e,a,b,58);
154	R3(b,c,d,e,a,59);
155	R4(a,b,c,d,e,60);
156	R4(e,a,b,c,d,61);
157	R4(d,e,a,b,c,62);
158	R4(c,d,e,a,b,63);
159	R4(b,c,d,e,a,64);
160	R4(a,b,c,d,e,65);
161	R4(e,a,b,c,d,66);
162	R4(d,e,a,b,c,67);
163	R4(c,d,e,a,b,68);
164	R4(b,c,d,e,a,69);
165	R4(a,b,c,d,e,70);
166	R4(e,a,b,c,d,71);
167	R4(d,e,a,b,c,72);
168	R4(c,d,e,a,b,73);
169	R4(b,c,d,e,a,74);
170	R4(a,b,c,d,e,75);
171	R4(e,a,b,c,d,76);
172	R4(d,e,a,b,c,77);
173	R4(c,d,e,a,b,78);
174	R4(b,c,d,e,a,79);
175
176	/* Add the working vars back into context.state[] */
177	state[0] += a;
178	state[1] += b;
179	state[2] += c;
180	state[3] += d;
181	state[4] += e;
182	}
183	/}}}/
184
185	// SHA1SumValue::SHA1SumValue - Constructs the summation from a string /{{{/
186	// ---------------------------------------------------------------------
187	/* The string form of a SHA1 is a 40 character hex number */
188	SHA1SumValue::SHA1SumValue(string Str)
189	{
190	memset(Sum,0,sizeof(Sum));
191	Set(Str);
192	}
193
194	/}}} /
195	// SHA1SumValue::SHA1SumValue - Default constructor /{{{/
196	// ---------------------------------------------------------------------
197	/* Sets the value to 0 */
198	SHA1SumValue::SHA1SumValue()
199	{
200	memset(Sum,0,sizeof(Sum));
201	}
202
203	/}}} /
204	// SHA1SumValue::Set - Set the sum from a string /{{{/
205	// ---------------------------------------------------------------------
206	/* Converts the hex string into a set of chars */
207	bool SHA1SumValue::Set(string Str)
208	{
c1ebf56d	209	return Hex2Num(Str,Sum,sizeof(Sum));
784202a2 AL	210	}
	211
	212	/}}} /
	213	// SHA1SumValue::Value - Convert the number into a string /{{{/
	214	// ---------------------------------------------------------------------
	215	/* Converts the set of chars into a hex string in lower case */
	216	string SHA1SumValue::Value() const
	217	{
	218	char Conv[16] =
	219	{ '0','1','2','3','4','5','6','7','8','9','a','b',
	220	'c','d','e','f'
	221	};
	222	char Result[41];
	223	Result[40] = 0;
	224
	225	// Convert each char into two letters
	226	int J = 0;
	227	int I = 0;
	228	for (; I != 40; J++,I += 2)
	229	{
	230	Result[I] = Conv[Sum[J] >> 4];
	231	Result[I + 1] = Conv[Sum[J] & 0xF];
	232	}
	233
	234	return string(Result);
	235	}
	236
	237	/}}} /
	238	// SHA1SumValue::operator == - Comparator /{{{/
	239	// ---------------------------------------------------------------------
	240	/* Call memcmp on the buffer */
	241	bool SHA1SumValue::operator == (const SHA1SumValue & rhs) const
	242	{
	243	return memcmp(Sum,rhs.Sum,sizeof(Sum)) == 0;
	244	}
	245	/}}}/
	246	// SHA1Summation::SHA1Summation - Constructor /{{{/
	247	// ---------------------------------------------------------------------
	248	/* */
	249	SHA1Summation::SHA1Summation()
	250	{
	251	uint32_t state = (uint32_t )State;
	252	uint32_t count = (uint32_t )Count;
	253
	254	/* SHA1 initialization constants */
	255	state[0] = 0x67452301;
	256	state[1] = 0xEFCDAB89;
	257	state[2] = 0x98BADCFE;
	258	state[3] = 0x10325476;
	259	state[4] = 0xC3D2E1F0;
	260	count[0] = 0;
	261	count[1] = 0;
	262	Done = false;
	263	}
	264	/}}}/
	265	// SHA1Summation::Result - Return checksum value /{{{/
	266	// ---------------------------------------------------------------------
	267	/* Add() may not be called after this */
	268	SHA1SumValue SHA1Summation::Result()
	269	{
	270	uint32_t state = (uint32_t )State;
	271	uint32_t count = (uint32_t )Count;
784202a2 AL	272
	273	// Apply the padding
	274	if (Done == false)
	275	{
	276	unsigned char finalcount[8];
	277
	278	for (unsigned i = 0; i < 8; i++)
	279	{
	280	// Endian independent
	281	finalcount[i] = (unsigned char) ((count[(i >= 4 ? 0 : 1)]
	282	>> ((3 - (i & 3)) * 8)) & 255);
	283	}
	284
	285	Add((unsigned char *) "\200",1);
	286	while ((count[0] & 504) != 448)
	287	Add((unsigned char *) "\0",1);
	288
	289	Add(finalcount,8); /* Should cause a SHA1Transform() */
	290
	291	}
	292
	293	Done = true;
	294
	295	// Transfer over the result
	296	SHA1SumValue Value;
	297	for (unsigned i = 0; i < 20; i++)
	298	{
	299	Value.Sum[i] = (unsigned char)
	300	((state[i >> 2] >> ((3 - (i & 3)) * 8)) & 255);
	301	}
	302	return Value;
	303	}
	304	/}}}/
	305	// SHA1Summation::Add - Adds content of buffer into the checksum /{{{/
	306	// ---------------------------------------------------------------------
	307	/* May not be called after Result() is called */
	308	bool SHA1Summation::Add(const unsigned char *data,unsigned long len)
	309	{
	310	if (Done)
	311	return false;
	312
	313	uint32_t state = (uint32_t )State;
	314	uint32_t count = (uint32_t )Count;
	315	uint8_t buffer = (uint8_t )Buffer;
	316	uint32_t i,j;
	317
	318	j = (count[0] >> 3) & 63;
	319	if ((count[0] += len << 3) < (len << 3))
	320	count[1]++;
	321	count[1] += (len >> 29);
	322	if ((j + len) > 63)
	323	{
	324	memcpy(&buffer[j],data,(i = 64 - j));
	325	SHA1Transform(state,buffer);
	326	for (; i + 63 < len; i += 64)
	327	{
	328	SHA1Transform(state,&data[i]);
	329	}
	330	j = 0;
	331	}
	332	else
	333	i = 0;
	334	memcpy(&buffer[j],&data[i],len - i);
	335
336	return true;
337	}
338	/}}}/
339	// SHA1Summation::AddFD - Add content of file into the checksum /{{{/
340	// ---------------------------------------------------------------------
341	/* */
342	bool SHA1Summation::AddFD(int Fd,unsigned long Size)
343	{
344	unsigned char Buf[64 * 64];
345	int Res = 0;
dc50285d	346	int ToEOF = (Size == 0);
879cd3ad	347	while (Size != 0 \|\| ToEOF)
784202a2	348	{
879cd3ad	349	unsigned n = sizeof(Buf);
dc50285d MZ	350	if (!ToEOF) n = MIN(Size,n);
	351	Res = read(Fd,Buf,n);
	352	if (Res < 0 \|\| (!ToEOF && (unsigned) Res != n)) // error, or short read
784202a2	353	return false;
dc50285d MZ	354	if (ToEOF && Res == 0) // EOF
dc50285d MZ	355	break;
784202a2 AL	356	Size -= Res;
	357	Add(Buf,Res);
	358	}
	359	return true;
	360	}
	361	/}}}/