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This comment expands all tabs using an 8-character tab-width. You should ignore this commit when using git blame or use git blame -w. In the early days, I used to use tabs where possible for indentation, since emacs did this automatically. In recent years, I have switched to only using spaces, which means qpdf source code has been a mixture of spaces and tabs. I have avoided cleaning this up because of not wanting gratuitous whitespaces change to cloud the output of git blame, but I changed my mind after discussing with users who view qpdf source code in editors/IDEs that have other tab widths by default and in light of the fact that I am planning to start applying automatic code formatting soon.
347 lines
11 KiB
C
347 lines
11 KiB
C
/* $Id: md_helper.c 216 2010-06-08 09:46:57Z tp $ */
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/*
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* This file contains some functions which implement the external data
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* handling and padding for Merkle-Damgard hash functions which follow
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* the conventions set out by MD4 (little-endian) or SHA-1 (big-endian).
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*
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* API: this file is meant to be included, not compiled as a stand-alone
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* file. Some macros must be defined:
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* RFUN name for the round function
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* HASH "short name" for the hash function
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* BE32 defined for big-endian, 32-bit based (e.g. SHA-1)
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* LE32 defined for little-endian, 32-bit based (e.g. MD5)
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* BE64 defined for big-endian, 64-bit based (e.g. SHA-512)
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* LE64 defined for little-endian, 64-bit based (no example yet)
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* PW01 if defined, append 0x01 instead of 0x80 (for Tiger)
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* BLEN if defined, length of a message block (in bytes)
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* PLW1 if defined, length is defined on one 64-bit word only (for Tiger)
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* PLW4 if defined, length is defined on four 64-bit words (for WHIRLPOOL)
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* SVAL if defined, reference to the context state information
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*
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* BLEN is used when a message block is not 16 (32-bit or 64-bit) words:
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* this is used for instance for Tiger, which works on 64-bit words but
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* uses 512-bit message blocks (eight 64-bit words). PLW1 and PLW4 are
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* ignored if 32-bit words are used; if 64-bit words are used and PLW1 is
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* set, then only one word (64 bits) will be used to encode the input
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* message length (in bits), otherwise two words will be used (as in
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* SHA-384 and SHA-512). If 64-bit words are used and PLW4 is defined (but
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* not PLW1), four 64-bit words will be used to encode the message length
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* (in bits). Note that regardless of those settings, only 64-bit message
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* lengths are supported (in bits): messages longer than 2 Exabytes will be
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* improperly hashed (this is unlikely to happen soon: 2 Exabytes is about
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* 2 millions Terabytes, which is huge).
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*
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* If CLOSE_ONLY is defined, then this file defines only the sph_XXX_close()
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* function. This is used for Tiger2, which is identical to Tiger except
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* when it comes to the padding (Tiger2 uses the standard 0x80 byte instead
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* of the 0x01 from original Tiger).
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*
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* The RFUN function is invoked with two arguments, the first pointing to
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* aligned data (as a "const void *"), the second being state information
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* from the context structure. By default, this state information is the
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* "val" field from the context, and this field is assumed to be an array
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* of words ("sph_u32" or "sph_u64", depending on BE32/LE32/BE64/LE64).
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* from the context structure. The "val" field can have any type, except
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* for the output encoding which assumes that it is an array of "sph_u32"
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* values. By defining NO_OUTPUT, this last step is deactivated; the
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* includer code is then responsible for writing out the hash result. When
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* NO_OUTPUT is defined, the third parameter to the "close()" function is
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* ignored.
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*
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* ==========================(LICENSE BEGIN)============================
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*
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* Copyright (c) 2007-2010 Projet RNRT SAPHIR
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
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* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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* ===========================(LICENSE END)=============================
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*
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* @author Thomas Pornin <thomas.pornin@cryptolog.com>
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*/
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#ifdef _MSC_VER
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#pragma warning (disable: 4146)
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#endif
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#undef SPH_XCAT
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#define SPH_XCAT(a, b) SPH_XCAT_(a, b)
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#undef SPH_XCAT_
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#define SPH_XCAT_(a, b) a ## b
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#undef SPH_BLEN
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#undef SPH_WLEN
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#if defined BE64 || defined LE64
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#define SPH_BLEN 128U
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#define SPH_WLEN 8U
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#else
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#define SPH_BLEN 64U
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#define SPH_WLEN 4U
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#endif
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#ifdef BLEN
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#undef SPH_BLEN
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#define SPH_BLEN BLEN
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#endif
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#undef SPH_MAXPAD
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#if defined PLW1
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#define SPH_MAXPAD (SPH_BLEN - SPH_WLEN)
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#elif defined PLW4
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#define SPH_MAXPAD (SPH_BLEN - (SPH_WLEN << 2))
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#else
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#define SPH_MAXPAD (SPH_BLEN - (SPH_WLEN << 1))
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#endif
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#undef SPH_VAL
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#undef SPH_NO_OUTPUT
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#ifdef SVAL
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#define SPH_VAL SVAL
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#define SPH_NO_OUTPUT 1
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#else
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#define SPH_VAL sc->val
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#endif
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#ifndef CLOSE_ONLY
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#ifdef SPH_UPTR
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static void
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SPH_XCAT(HASH, _short)(void *cc, const void *data, size_t len)
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#else
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void
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SPH_XCAT(sph_, HASH)(void *cc, const void *data, size_t len)
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#endif
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{
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SPH_XCAT(sph_, SPH_XCAT(HASH, _context)) *sc;
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unsigned current;
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sc = cc;
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#if SPH_64
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current = (unsigned)sc->count & (SPH_BLEN - 1U);
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#else
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current = (unsigned)sc->count_low & (SPH_BLEN - 1U);
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#endif
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while (len > 0) {
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unsigned clen;
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#if !SPH_64
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sph_u32 clow, clow2;
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#endif
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clen = SPH_BLEN - current;
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if (clen > len)
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clen = (unsigned)len;
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memcpy(sc->buf + current, data, clen);
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data = (const unsigned char *)data + clen;
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current += clen;
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len -= clen;
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if (current == SPH_BLEN) {
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RFUN(sc->buf, SPH_VAL);
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current = 0;
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}
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#if SPH_64
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sc->count += clen;
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#else
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clow = sc->count_low;
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clow2 = SPH_T32(clow + clen);
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sc->count_low = clow2;
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if (clow2 < clow)
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sc->count_high ++;
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#endif
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}
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}
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#ifdef SPH_UPTR
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void
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SPH_XCAT(sph_, HASH)(void *cc, const void *data, size_t len)
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{
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SPH_XCAT(sph_, SPH_XCAT(HASH, _context)) *sc;
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unsigned current;
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size_t orig_len;
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#if !SPH_64
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sph_u32 clow, clow2;
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#endif
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if (len < (2 * SPH_BLEN)) {
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SPH_XCAT(HASH, _short)(cc, data, len);
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return;
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}
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sc = cc;
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#if SPH_64
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current = (unsigned)sc->count & (SPH_BLEN - 1U);
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#else
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current = (unsigned)sc->count_low & (SPH_BLEN - 1U);
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#endif
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if (current > 0) {
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unsigned t;
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t = SPH_BLEN - current;
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SPH_XCAT(HASH, _short)(cc, data, t);
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data = (const unsigned char *)data + t;
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len -= t;
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}
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#if !SPH_UNALIGNED
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if (((SPH_UPTR)data & (SPH_WLEN - 1U)) != 0) {
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SPH_XCAT(HASH, _short)(cc, data, len);
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return;
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}
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#endif
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orig_len = len;
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while (len >= SPH_BLEN) {
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RFUN(data, SPH_VAL);
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len -= SPH_BLEN;
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data = (const unsigned char *)data + SPH_BLEN;
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}
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if (len > 0)
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memcpy(sc->buf, data, len);
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#if SPH_64
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sc->count += (sph_u64)orig_len;
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#else
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clow = sc->count_low;
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clow2 = SPH_T32(clow + orig_len);
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sc->count_low = clow2;
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if (clow2 < clow)
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sc->count_high ++;
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/*
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* This code handles the improbable situation where "size_t" is
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* greater than 32 bits, and yet we do not have a 64-bit type.
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*/
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orig_len >>= 12;
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orig_len >>= 10;
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orig_len >>= 10;
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sc->count_high += orig_len;
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#endif
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}
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#endif
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#endif
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/*
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* Perform padding and produce result. The context is NOT reinitialized
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* by this function.
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*/
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static void
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SPH_XCAT(HASH, _addbits_and_close)(void *cc,
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unsigned ub, unsigned n, void *dst, unsigned rnum)
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{
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SPH_XCAT(sph_, SPH_XCAT(HASH, _context)) *sc;
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unsigned current, u;
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#if !SPH_64
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sph_u32 low, high;
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#endif
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sc = cc;
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#if SPH_64
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current = (unsigned)sc->count & (SPH_BLEN - 1U);
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#else
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current = (unsigned)sc->count_low & (SPH_BLEN - 1U);
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#endif
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#ifdef PW01
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sc->buf[current ++] = (0x100 | (ub & 0xFF)) >> (8 - n);
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#else
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{
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unsigned z;
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z = 0x80U >> n;
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sc->buf[current ++] = ((ub & -z) | z) & 0xFF;
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}
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#endif
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if (current > SPH_MAXPAD) {
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memset(sc->buf + current, 0, SPH_BLEN - current);
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RFUN(sc->buf, SPH_VAL);
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memset(sc->buf, 0, SPH_MAXPAD);
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} else {
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memset(sc->buf + current, 0, SPH_MAXPAD - current);
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}
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#if defined BE64
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#if defined PLW1
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#elif defined PLW4
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memset(sc->buf + SPH_MAXPAD, 0, 2 * SPH_WLEN);
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD + 2 * SPH_WLEN,
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sc->count >> 61);
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD + 3 * SPH_WLEN,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#else
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD, sc->count >> 61);
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD + SPH_WLEN,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#endif
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#elif defined LE64
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#if defined PLW1
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#elif defined PLW1
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD + SPH_WLEN, sc->count >> 61);
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memset(sc->buf + SPH_MAXPAD + 2 * SPH_WLEN, 0, 2 * SPH_WLEN);
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#else
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD + SPH_WLEN, sc->count >> 61);
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#endif
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#else
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#if SPH_64
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#ifdef BE32
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sph_enc64be_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#else
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sph_enc64le_aligned(sc->buf + SPH_MAXPAD,
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SPH_T64(sc->count << 3) + (sph_u64)n);
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#endif
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#else
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low = sc->count_low;
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high = SPH_T32((sc->count_high << 3) | (low >> 29));
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low = SPH_T32(low << 3) + (sph_u32)n;
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#ifdef BE32
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sph_enc32be(sc->buf + SPH_MAXPAD, high);
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sph_enc32be(sc->buf + SPH_MAXPAD + SPH_WLEN, low);
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#else
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sph_enc32le(sc->buf + SPH_MAXPAD, low);
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sph_enc32le(sc->buf + SPH_MAXPAD + SPH_WLEN, high);
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#endif
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#endif
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#endif
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RFUN(sc->buf, SPH_VAL);
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#ifdef SPH_NO_OUTPUT
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(void)dst;
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(void)rnum;
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(void)u;
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#else
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for (u = 0; u < rnum; u ++) {
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#if defined BE64
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sph_enc64be((unsigned char *)dst + 8 * u, sc->val[u]);
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#elif defined LE64
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sph_enc64le((unsigned char *)dst + 8 * u, sc->val[u]);
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#elif defined BE32
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sph_enc32be((unsigned char *)dst + 4 * u, sc->val[u]);
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#else
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sph_enc32le((unsigned char *)dst + 4 * u, sc->val[u]);
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#endif
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}
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#endif
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}
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static void
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SPH_XCAT(HASH, _close)(void *cc, void *dst, unsigned rnum)
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{
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SPH_XCAT(HASH, _addbits_and_close)(cc, 0, 0, dst, rnum);
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}
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