Ticket #2198: sha1cmd.c

/*
 * sha1cmd.c
 * Copied from md5cmd.c 20040903 EH
 *
 * Copyright (c) 2002 - 2003 Apple Computer, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Apple Computer, Inc. nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <tcl.h>

#if HAVE_STRING_H
#include <string.h>
#endif

#if defined(HAVE_LIBCRYPTO) && !defined(HAVE_LIBMD)

/* Minimal wrapper around OpenSSL's libcrypto, as a compatibility
 * layer for FreeBSD's libmd library.
 * Originally written by: Rob Braun (bbraun) 1/18/2002
 */

#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>

#include <openssl/sha.h>

#define SHA1Init(x) SHA1_Init(x)
#define SHA1Update(x,y,z) SHA1_Update(x,y,z)
#define SHA1Final(x,y) SHA1_Final(x,y)

char *
SHA1End(SHA_CTX *ctx, char *buf)
{
    int i;
    unsigned char digest[SHA_DIGEST_LENGTH];
    static const char hex[]="0123456789abcdef";

    if (!buf)
        buf = malloc(2*SHA_DIGEST_LENGTH + 1);
    if (!buf)
        return 0;
    SHA1Final(digest, ctx);
    for (i = 0; i < SHA_DIGEST_LENGTH; i++) {
        buf[i+i] = hex[digest[i] >> 4];
        buf[i+i+1] = hex[digest[i] & 0x0f];
    }
    buf[i+i] = '\0';
    return buf;
}

char *SHA1File(const char *filename, char *buf)
{
    unsigned char buffer[BUFSIZ];
    SHA_CTX ctx;
    int f,i,j;

    SHA1Init(&ctx);
    f = open(filename,O_RDONLY);
    if (f < 0) return 0;
    while ((i = read(f,buffer,sizeof buffer)) > 0) {
        SHA1Update(&ctx,buffer,i);
    }
    j = errno;
    close(f);
    errno = j;
    if (i < 0) return 0;
    return SHA1End(&ctx, buf);
}

char *SHA1Data(const unsigned char *data, unsigned int len, char *buf)
{
        SHA_CTX ctx;
        SHA1Init(&ctx);
        SHA1Update(&ctx, data, len);
        return SHA1End(&ctx, buf);
}
#elif defined(HAVE_LIBMD)
#include <sys/types.h>
#include <sha1.h>
#else
#error libcrypto or libmd are required
#endif

int SHA1Cmd(ClientData clientData UNUSED, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])
{
        char *file, *action;
        char buf[2*SHA_DIGEST_LENGTH + 1];
        const char usage_message[] = "Usage: sha1 file ?file?";
        const char error_message[] = "Could not open file: ";
        Tcl_Obj *tcl_result;

        if (objc != 3) {
                Tcl_WrongNumArgs(interp, 1, objv, "action ?file?");
                return TCL_ERROR;
        }

        /*
         * Only the 'file' action is currently supported
         */
        action = Tcl_GetString(objv[1]);
        if (strcmp(action, "file") != 0) {
                tcl_result = Tcl_NewStringObj(usage_message, sizeof(usage_message) - 1);
                Tcl_SetObjResult(interp, tcl_result);
                return TCL_ERROR;
        }
        file = Tcl_GetString(objv[2]);

        if (!SHA1File(file, buf)) {
                tcl_result = Tcl_NewStringObj(error_message, sizeof(error_message) - 1);
                Tcl_AppendObjToObj(tcl_result, Tcl_NewStringObj(file, -1));
                Tcl_SetObjResult(interp, tcl_result);
                return TCL_ERROR;
        }
        tcl_result = Tcl_NewStringObj(buf, sizeof(buf) - 1);
        Tcl_SetObjResult(interp, tcl_result);
        return TCL_OK;
}