Quelle cmsmd5.c Sprache: C

/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.  Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/

// This file is available under and governed by the GNU General Public
// License version 2 only, as published by the Free Software Foundation.
// However, the following notice accompanied the original version of this
// file:
//
//---------------------------------------------------------------------------------
//
//  Little Color Management System
//  Copyright (c) 1998-2022 Marti Maria Saguer
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the Software
// is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO
// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
//---------------------------------------------------------------------------------

#include "lcms2_internal.h"

#ifdef CMS_USE_BIG_ENDIAN

static
void byteReverse(cmsUInt8Number * buf, cmsUInt32Number longs)
{
    do {

        cmsUInt32Number t = _cmsAdjustEndianess32(*(cmsUInt32Number *) buf);
        *(cmsUInt32Number *) buf = t;
        buf += sizeof(cmsUInt32Number);

    } while (--longs);

}

#else
#define byteReverse(buf, len)
#endif

typedef struct {

    cmsUInt32Number buf[4];
    cmsUInt32Number bits[2];
    cmsUInt8Number in[64];
    cmsContext ContextID;

} _cmsMD5;

#define F1(x, y, z) (z ^ (x & (y ^ z)))
#define F2(x, y, z) F1(z, x, y)
#define F3(x, y, z) (x ^ y ^ z)
#define F4(x, y, z) (y ^ (x | ~z))

#define STEP(f, w, x, y, z, data, s) \
    ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s),  w += x )

static
void cmsMD5_Transform(cmsUInt32Number buf[4], cmsUInt32Number in[16])
{
    CMSREGISTER cmsUInt32Number a, b, c, d;

    a = buf[0];
    b = buf[1];
    c = buf[2];
    d = buf[3];

    STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
    STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
    STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
    STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
    STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
    STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
    STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
    STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
    STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
    STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
    STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
    STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
    STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
    STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
    STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
    STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);

    STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
    STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
    STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
    STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
    STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
    STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
    STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
    STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
    STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
    STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
    STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
    STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
    STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
    STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
    STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
    STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);

    STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
    STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
    STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
    STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
    STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
    STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
    STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
    STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
    STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
    STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
    STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
    STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
    STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
    STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
    STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
    STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);

    STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
    STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
    STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
    STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
    STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
    STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
    STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
    STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
    STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
    STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
    STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
    STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
    STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
    STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
    STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
    STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);

    buf[0] += a;
    buf[1] += b;
    buf[2] += c;
    buf[3] += d;
}

// Create a MD5 object

cmsHANDLE CMSEXPORT cmsMD5alloc(cmsContext ContextID)
{
    _cmsMD5* ctx = (_cmsMD5*) _cmsMallocZero(ContextID, sizeof(_cmsMD5));
    if (ctx == NULL) return NULL;

    ctx ->ContextID = ContextID;

    ctx->buf[0] = 0x67452301;
    ctx->buf[1] = 0xefcdab89;
    ctx->buf[2] = 0x98badcfe;
    ctx->buf[3] = 0x10325476;

    ctx->bits[0] = 0;
    ctx->bits[1] = 0;

    return (cmsHANDLE) ctx;
}

void CMSEXPORT cmsMD5add(cmsHANDLE Handle, const cmsUInt8Number* buf, cmsUInt32Number len)
{
    _cmsMD5* ctx = (_cmsMD5*) Handle;
    cmsUInt32Number t;

    t = ctx->bits[0];
    if ((ctx->bits[0] = t + (len << 3)) < t)
        ctx->bits[1]++;

    ctx->bits[1] += len >> 29;

    t = (t >> 3) & 0x3f;

    if (t) {

        cmsUInt8Number *p = (cmsUInt8Number *) ctx->in + t;

        t = 64 - t;
        if (len < t) {
            memmove(p, buf, len);
            return;
        }

        memmove(p, buf, t);
        byteReverse(ctx->in, 16);

        cmsMD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
        buf += t;
        len -= t;
    }

    while (len >= 64) {
        memmove(ctx->in, buf, 64);
        byteReverse(ctx->in, 16);
        cmsMD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);
        buf += 64;
        len -= 64;
    }

    memmove(ctx->in, buf, len);
}

// Destroy the object and return the checksum
void CMSEXPORT cmsMD5finish(cmsProfileID* ProfileID,  cmsHANDLE Handle)
{
    _cmsMD5* ctx = (_cmsMD5*) Handle;
    cmsUInt32Number count;
    cmsUInt8Number *p;

    count = (ctx->bits[0] >> 3) & 0x3F;

    p = ctx->in + count;
    *p++ = 0x80;

    count = 64 - 1 - count;

    if (count < 8) {

        memset(p, 0, count);
        byteReverse(ctx->in, 16);
        cmsMD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);

        memset(ctx->in, 0, 56);
    } else {
        memset(p, 0, count - 8);
    }
    byteReverse(ctx->in, 14);

    ((cmsUInt32Number *) ctx->in)[14] = ctx->bits[0];
    ((cmsUInt32Number *) ctx->in)[15] = ctx->bits[1];

    cmsMD5_Transform(ctx->buf, (cmsUInt32Number *) ctx->in);

    byteReverse((cmsUInt8Number *) ctx->buf, 4);
    memmove(ProfileID ->ID8, ctx->buf, 16);

    _cmsFree(ctx ->ContextID, ctx);
}

// Assuming io points to an ICC profile, compute and store MD5 checksum
// In the header, rendering intentent, attributes and ID should be set to zero
// before computing MD5 checksum (per 6.1.13 in ICC spec)

cmsBool CMSEXPORT cmsMD5computeID(cmsHPROFILE hProfile)
{
    cmsContext   ContextID;
    cmsUInt32Number BytesNeeded;
    cmsUInt8Number* Mem = NULL;
    cmsHANDLE  MD5 = NULL;
    _cmsICCPROFILE* Icc = (_cmsICCPROFILE*) hProfile;
    _cmsICCPROFILE Keep;

    _cmsAssert(hProfile != NULL);

    ContextID = cmsGetProfileContextID(hProfile);

    // Save a copy of the profile header
    memmove(&Keep, Icc, sizeof(_cmsICCPROFILE));

    // Set RI, attributes and ID
    memset(&Icc ->attributes, 0, sizeof(Icc ->attributes));
    Icc ->RenderingIntent = 0;
    memset(&Icc ->ProfileID, 0, sizeof(Icc ->ProfileID));

    // Compute needed storage
    if (!cmsSaveProfileToMem(hProfile, NULL, &BytesNeeded)) goto Error;

    // Allocate memory
    Mem = (cmsUInt8Number*) _cmsMalloc(ContextID, BytesNeeded);
    if (Mem == NULL) goto Error;

    // Save to temporary storage
    if (!cmsSaveProfileToMem(hProfile, Mem, &BytesNeeded)) goto Error;

    // Create MD5 object
    MD5 = cmsMD5alloc(ContextID);
    if (MD5 == NULL) goto Error;

    // Add all bytes
    cmsMD5add(MD5, Mem, BytesNeeded);

    // Temp storage is no longer needed
    _cmsFree(ContextID, Mem);

    // Restore header
    memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));

    // And store the ID
    cmsMD5finish(&Icc ->ProfileID,  MD5);
    return TRUE;

Error:

    // Free resources as something went wrong
    // "MD5" cannot be other than NULL here, so no need to free it
    if (Mem != NULL) _cmsFree(ContextID, Mem);
    memmove(Icc, &Keep, sizeof(_cmsICCPROFILE));
    return FALSE;
}

quality66%

¤ Dauer der Verarbeitung: 0.2 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.