1 /*---------------------------------------------------------------------------*\
3 \\ / F ield | foam-extend: Open Source CFD
5 \\ / A nd | For copyright notice see file Copyright
7 -------------------------------------------------------------------------------
9 This file is part of foam-extend.
11 foam-extend is free software: you can redistribute it and/or modify it
12 under the terms of the GNU General Public License as published by the
13 Free Software Foundation, either version 3 of the License, or (at your
14 option) any later version.
16 foam-extend is distributed in the hope that it will be useful, but
17 WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 General Public License for more details.
21 You should have received a copy of the GNU General Public License
22 along with foam-extend. If not, see <http://www.gnu.org/licenses/>.
25 Functions to compute SHA1 message digest of files or memory blocks
26 according to the NIST specification FIPS-180-1.
28 Adapted from the gnulib implementation written by Scott G. Miller with
29 credits to Robert Klep <robert@ilse.nl> -- Expansion function fix
31 Copyright (C) 2000, 2001, 2003, 2004, 2005, 2006, 2008 Free Software
34 \*---------------------------------------------------------------------------*/
37 #include "IOstreams.H"
41 #if defined (__GLIBC__)
46 // * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
49 // The bytes used to pad buffer to the next 64-byte boundary.
50 // (RFC 1321, 3.1: Step 1)
51 static const unsigned char fillbuf[64] = { 0x80, 0 /* , 0, 0, ... */ };
52 //! @endcond fileScope
55 // * * * * * * * * * * * * Static Member Functions * * * * * * * * * * * * * //
57 inline uint32_t Foam::SHA1::swapBytes(uint32_t n)
60 # if (__BYTE_ORDER == __BIG_ENDIAN)
63 return (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24));
68 const short x = 0x0100;
70 // yields 0x01 for big endian
71 if (*(reinterpret_cast<const char *>(&x)))
77 return (((n) << 24) | (((n) & 0xff00) << 8) | (((n) >> 8) & 0xff00) | ((n) >> 24));
84 Foam::SHA1::set_uint32(unsigned char *cp, uint32_t v)
86 memcpy(cp, &v, sizeof(uint32_t));
90 // * * * * * * * * * * * * Private Member Functions * * * * * * * * * * * * //
93 void Foam::SHA1::processBytes(const void *data, size_t len)
95 // already finalized, thus need to restart from nothing
101 // complete filling of internal buffer
104 size_t remaining = bufLen_;
107 sizeof(buffer_) - remaining > len
109 : sizeof(buffer_) - remaining
112 unsigned char* bufp = reinterpret_cast<unsigned char*>(buffer_);
114 memcpy(&bufp[remaining], data, add);
119 processBlock(buffer_, bufLen_ & ~63);
122 // The regions in the following copy operation do not (cannot) overlap
123 memcpy(buffer_, &bufp[(remaining + add) & ~63], bufLen_);
126 data = reinterpret_cast<const unsigned char*>(data) + add;
130 // Process available complete blocks
133 //#if !_STRING_ARCH_unaligned
134 //# define alignof(type) offsetof (struct { char c; type x; }, x)
135 //# define UNALIGNED_P(p) (((size_t) p) % alignof (uint32_t) != 0)
136 // if (UNALIGNED_P (data))
140 processBlock(memcpy (buffer_, data, 64), 64);
141 data = reinterpret_cast<const unsigned char*>(data) + 64;
148 // processBlock(data, len & ~63);
149 // data = reinterpret_cast<const unsigned char*>(data) + (len & ~63);
154 // Move remaining bytes in internal buffer.
157 unsigned char* bufp = reinterpret_cast<unsigned char*>(buffer_);
158 size_t remaining = bufLen_;
160 memcpy (&bufp[remaining], data, len);
164 processBlock(buffer_, 64);
166 memcpy (buffer_, &buffer_[16], remaining);
173 // SHA1 round constants
174 #define K1 0x5a827999
175 #define K2 0x6ed9eba1
176 #define K3 0x8f1bbcdc
177 #define K4 0xca62c1d6
179 // Round functions. Note that F2 is the same as F4.
180 #define F1(B,C,D) ( D ^ ( B & ( C ^ D ) ) )
181 #define F2(B,C,D) (B ^ C ^ D)
182 #define F3(B,C,D) ( ( B & C ) | ( D & ( B | C ) ) )
183 #define F4(B,C,D) (B ^ C ^ D)
185 // Process LEN bytes of BUFFER, it is assumed that LEN % 64 == 0.
186 // Most of this code comes from GnuPG's cipher/sha1.c
189 Foam::SHA1::processBlock(const void *data, size_t len)
191 const uint32_t *words = reinterpret_cast<const uint32_t*>(data);
192 size_t nwords = len / sizeof(uint32_t);
193 const uint32_t *endp = words + nwords;
195 // calculate with sixteen words of 32-bits
197 uint32_t a = hashsumA_;
198 uint32_t b = hashsumB_;
199 uint32_t c = hashsumC_;
200 uint32_t d = hashsumD_;
201 uint32_t e = hashsumE_;
203 // First increment the byte count.
204 // RFC 1321 specifies the possible length of the file up to 2^64 bits.
205 // Here we only compute the number of bytes. Do a double word increment.
207 if (bufTotal_[0] < len)
212 // rotate left uint32_t by n bits
213 #define rol_uint32(x, nbits) (((x) << (nbits)) | ((x) >> (32 - (nbits))))
215 #define M(I) ( tm = x[I & 0x0F] ^ x[(I-14) & 0x0F] \
216 ^ x[(I-8) & 0x0F] ^ x[(I-3) & 0x0F] \
217 , (x[I & 0x0F] = rol_uint32(tm, 1)) )
220 #define R(A,B,C,D,E,F,K,M) \
223 E += rol_uint32(A, 5) + F(B, C, D) + K + M; \
224 B = rol_uint32(B, 30); \
230 for (int t = 0; t < 16; t++)
232 x[t] = swapBytes (*words);
236 R( a, b, c, d, e, F1, K1, x[ 0] );
237 R( e, a, b, c, d, F1, K1, x[ 1] );
238 R( d, e, a, b, c, F1, K1, x[ 2] );
239 R( c, d, e, a, b, F1, K1, x[ 3] );
240 R( b, c, d, e, a, F1, K1, x[ 4] );
241 R( a, b, c, d, e, F1, K1, x[ 5] );
242 R( e, a, b, c, d, F1, K1, x[ 6] );
243 R( d, e, a, b, c, F1, K1, x[ 7] );
244 R( c, d, e, a, b, F1, K1, x[ 8] );
245 R( b, c, d, e, a, F1, K1, x[ 9] );
246 R( a, b, c, d, e, F1, K1, x[10] );
247 R( e, a, b, c, d, F1, K1, x[11] );
248 R( d, e, a, b, c, F1, K1, x[12] );
249 R( c, d, e, a, b, F1, K1, x[13] );
250 R( b, c, d, e, a, F1, K1, x[14] );
251 R( a, b, c, d, e, F1, K1, x[15] );
252 R( e, a, b, c, d, F1, K1, M(16) );
253 R( d, e, a, b, c, F1, K1, M(17) );
254 R( c, d, e, a, b, F1, K1, M(18) );
255 R( b, c, d, e, a, F1, K1, M(19) );
256 R( a, b, c, d, e, F2, K2, M(20) );
257 R( e, a, b, c, d, F2, K2, M(21) );
258 R( d, e, a, b, c, F2, K2, M(22) );
259 R( c, d, e, a, b, F2, K2, M(23) );
260 R( b, c, d, e, a, F2, K2, M(24) );
261 R( a, b, c, d, e, F2, K2, M(25) );
262 R( e, a, b, c, d, F2, K2, M(26) );
263 R( d, e, a, b, c, F2, K2, M(27) );
264 R( c, d, e, a, b, F2, K2, M(28) );
265 R( b, c, d, e, a, F2, K2, M(29) );
266 R( a, b, c, d, e, F2, K2, M(30) );
267 R( e, a, b, c, d, F2, K2, M(31) );
268 R( d, e, a, b, c, F2, K2, M(32) );
269 R( c, d, e, a, b, F2, K2, M(33) );
270 R( b, c, d, e, a, F2, K2, M(34) );
271 R( a, b, c, d, e, F2, K2, M(35) );
272 R( e, a, b, c, d, F2, K2, M(36) );
273 R( d, e, a, b, c, F2, K2, M(37) );
274 R( c, d, e, a, b, F2, K2, M(38) );
275 R( b, c, d, e, a, F2, K2, M(39) );
276 R( a, b, c, d, e, F3, K3, M(40) );
277 R( e, a, b, c, d, F3, K3, M(41) );
278 R( d, e, a, b, c, F3, K3, M(42) );
279 R( c, d, e, a, b, F3, K3, M(43) );
280 R( b, c, d, e, a, F3, K3, M(44) );
281 R( a, b, c, d, e, F3, K3, M(45) );
282 R( e, a, b, c, d, F3, K3, M(46) );
283 R( d, e, a, b, c, F3, K3, M(47) );
284 R( c, d, e, a, b, F3, K3, M(48) );
285 R( b, c, d, e, a, F3, K3, M(49) );
286 R( a, b, c, d, e, F3, K3, M(50) );
287 R( e, a, b, c, d, F3, K3, M(51) );
288 R( d, e, a, b, c, F3, K3, M(52) );
289 R( c, d, e, a, b, F3, K3, M(53) );
290 R( b, c, d, e, a, F3, K3, M(54) );
291 R( a, b, c, d, e, F3, K3, M(55) );
292 R( e, a, b, c, d, F3, K3, M(56) );
293 R( d, e, a, b, c, F3, K3, M(57) );
294 R( c, d, e, a, b, F3, K3, M(58) );
295 R( b, c, d, e, a, F3, K3, M(59) );
296 R( a, b, c, d, e, F4, K4, M(60) );
297 R( e, a, b, c, d, F4, K4, M(61) );
298 R( d, e, a, b, c, F4, K4, M(62) );
299 R( c, d, e, a, b, F4, K4, M(63) );
300 R( b, c, d, e, a, F4, K4, M(64) );
301 R( a, b, c, d, e, F4, K4, M(65) );
302 R( e, a, b, c, d, F4, K4, M(66) );
303 R( d, e, a, b, c, F4, K4, M(67) );
304 R( c, d, e, a, b, F4, K4, M(68) );
305 R( b, c, d, e, a, F4, K4, M(69) );
306 R( a, b, c, d, e, F4, K4, M(70) );
307 R( e, a, b, c, d, F4, K4, M(71) );
308 R( d, e, a, b, c, F4, K4, M(72) );
309 R( c, d, e, a, b, F4, K4, M(73) );
310 R( b, c, d, e, a, F4, K4, M(74) );
311 R( a, b, c, d, e, F4, K4, M(75) );
312 R( e, a, b, c, d, F4, K4, M(76) );
313 R( d, e, a, b, c, F4, K4, M(77) );
314 R( c, d, e, a, b, F4, K4, M(78) );
315 R( b, c, d, e, a, F4, K4, M(79) );
326 void Foam::SHA1::calcDigest(SHA1Digest& dig) const
328 if (bufTotal_[0] || bufTotal_[1])
330 unsigned char *r = dig.v_;
332 set_uint32 (r + 0 * sizeof(uint32_t), swapBytes(hashsumA_));
333 set_uint32 (r + 1 * sizeof(uint32_t), swapBytes(hashsumB_));
334 set_uint32 (r + 2 * sizeof(uint32_t), swapBytes(hashsumC_));
335 set_uint32 (r + 3 * sizeof(uint32_t), swapBytes(hashsumD_));
336 set_uint32 (r + 4 * sizeof(uint32_t), swapBytes(hashsumE_));
346 // * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
348 // * * * * * * * * * * * * * * * * Selectors * * * * * * * * * * * * * * * * //
350 // * * * * * * * * * * * * * * * * Destructor * * * * * * * * * * * * * * * //
353 // * * * * * * * * * * * * Protected Member Functions * * * * * * * * * * * //
356 // * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * * //
359 void Foam::SHA1::clear()
361 hashsumA_ = 0x67452301;
362 hashsumB_ = 0xefcdab89;
363 hashsumC_ = 0x98badcfe;
364 hashsumD_ = 0x10325476;
365 hashsumE_ = 0xc3d2e1f0;
367 bufTotal_[0] = bufTotal_[1] = 0;
374 bool Foam::SHA1::finalize()
380 // account for unprocessed bytes
381 uint32_t bytes = bufLen_;
382 size_t size = (bytes < 56 ? 64 : 128) / sizeof(uint32_t);
384 // count remaining bytes.
385 bufTotal_[0] += bytes;
386 if (bufTotal_[0] < bytes)
391 // finalized, but no data!
392 if (!bufTotal_[0] && !bufTotal_[1])
397 // place the 64-bit file length in *bits* at the end of the buffer.
398 buffer_[size-2] = swapBytes((bufTotal_[1] << 3) | (bufTotal_[0] >> 29));
399 buffer_[size-1] = swapBytes(bufTotal_[0] << 3);
401 unsigned char* bufp = reinterpret_cast<unsigned char *>(buffer_);
403 memcpy(&bufp[bytes], fillbuf, (size-2) * sizeof(uint32_t) - bytes);
405 // Process remaining bytes
406 processBlock(buffer_, size * sizeof(uint32_t));
413 Foam::SHA1Digest Foam::SHA1::digest() const
423 // avoid disturbing our data - use a copy
435 // * * * * * * * * * * * * * * Member Operators * * * * * * * * * * * * * * //
437 // void Foam::SHA1::operator=(const SHA1& rhs)
439 // // Check for assignment to self
442 // FatalErrorIn("Foam::SHA1::operator=(const Foam::SHA1&)")
443 // << "Attempted assignment to self"
444 // << abort(FatalError);
448 // * * * * * * * * * * * * * * Friend Functions * * * * * * * * * * * * * * //
451 // * * * * * * * * * * * * * * Friend Operators * * * * * * * * * * * * * * //
454 // ************************************************************************* //