156 lines
2.5 KiB
C
156 lines
2.5 KiB
C
#ifndef lint
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static char sccsid[] = "@(#)xcrypt.c 1.1 94/10/31 Copyr 1986 Sun Micro";
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#endif
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/*
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* Hex encryption/decryption and utility routines
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*
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* Copyright (C) 1986, Sun Microsystems, Inc.
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*/
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#include <stdio.h>
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#include <des_crypt.h>
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extern char *malloc();
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extern char hex[]; /* forward */
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static char hexval();
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/*
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* Encrypt a secret key given passwd
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* The secret key is passed and returned in hex notation.
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* Its length must be a multiple of 16 hex digits (64 bits).
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*/
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xencrypt(secret, passwd)
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char *secret;
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char *passwd;
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{
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char key[8];
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char ivec[8];
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char *buf;
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int err;
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int len;
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len = strlen(secret) / 2;
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buf = malloc((unsigned)len);
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hex2bin(len, secret, buf);
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passwd2des(passwd, key);
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bzero(ivec, 8);
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err = cbc_crypt(key, buf, len, DES_ENCRYPT | DES_HW, ivec);
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if (DES_FAILED(err)) {
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free(buf);
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return (0);
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}
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bin2hex(len, (unsigned char *) buf, secret);
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free(buf);
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return (1);
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}
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/*
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* Decrypt secret key using passwd
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* The secret key is passed and returned in hex notation.
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* Once again, the length is a multiple of 16 hex digits
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*/
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xdecrypt(secret, passwd)
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char *secret;
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char *passwd;
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{
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char key[8];
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char ivec[8];
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char *buf;
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int err;
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int len;
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len = strlen(secret) / 2;
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buf = malloc((unsigned)len);
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hex2bin(len, secret, buf);
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passwd2des(passwd, key);
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bzero(ivec, 8);
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err = cbc_crypt(key, buf, len, DES_DECRYPT | DES_HW, ivec);
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if (DES_FAILED(err)) {
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free(buf);
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return (0);
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}
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bin2hex(len, (unsigned char *) buf, secret);
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free(buf);
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return (1);
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}
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/*
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* Turn password into DES key
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*/
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passwd2des(pw, key)
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char *pw;
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char *key;
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{
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int i;
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bzero(key, 8);
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for (i = 0; *pw; i = (i+1)%8) {
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key[i] ^= *pw++ << 1;
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}
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des_setparity(key);
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}
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/*
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* Hex to binary conversion
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*/
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static
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hex2bin(len, hexnum, binnum)
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int len;
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char *hexnum;
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char *binnum;
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{
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int i;
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for (i = 0; i < len; i++) {
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*binnum++ = 16 * hexval(hexnum[2*i]) + hexval(hexnum[2*i+1]);
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}
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}
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/*
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* Binary to hex conversion
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*/
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static
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bin2hex(len, binnum, hexnum)
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int len;
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unsigned char *binnum;
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char *hexnum;
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{
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int i;
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unsigned val;
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for (i = 0; i < len; i++) {
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val = binnum[i];
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hexnum[i*2] = hex[val >> 4];
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hexnum[i*2+1] = hex[val & 0xf];
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}
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hexnum[len*2] = 0;
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}
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static char hex[16] = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'a', 'b', 'c', 'd', 'e', 'f',
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};
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static char
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hexval(c)
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char c;
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{
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if (c >= '0' && c <= '9') {
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return (c - '0');
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} else if (c >= 'a' && c <= 'z') {
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return (c - 'a' + 10);
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} else if (c >= 'A' && c <= 'Z') {
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return (c - 'A' + 10);
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} else {
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return (-1);
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}
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}
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