crypto/external/bsd/heimdal/dist/lib/otp/otp_md.c

   1 /*      $NetBSD: otp_md.c,v 1.1.1.2 2014/04/24 12:45:51 pettai Exp $    */
   2
   3 /*
   4  * Copyright (c) 1995 - 2003 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #define HC_DEPRECATED_CRYPTO
  37
  38 #include "config.h"
  39
  40 #include "otp_locl.h"
  41
  42 #include "otp_md.h"
  43 #include "crypto-headers.h"
  44
  45 /*
  46  * Compress len bytes from md into key
  47  */
  48
  49 static void
  50 compressmd (OtpKey key, unsigned char *md, size_t len)
  51 {
  52     u_char *p = key;
  53
  54     memset (p, 0, OTPKEYSIZE);
  55     while(len) {
  56         *p++ ^= *md++;
  57         *p++ ^= *md++;
  58         *p++ ^= *md++;
  59         *p++ ^= *md++;
  60         len -= 4;
  61         if (p == key + OTPKEYSIZE)
  62             p = key;
  63     }
  64 }
  65
  66 /*
  67  * For histerical reasons, in the OTP definition it's said that
  68  * the result from SHA must be stored in little-endian order.  See
  69  * draft-ietf-otp-01.txt.
  70  */
  71
  72 static void
  73 little_endian(unsigned char *res, size_t len)
  74 {
  75     unsigned char t;
  76     size_t i;
  77
  78     for (i = 0; i < len; i += 4) {
  79         t = res[i + 0]; res[i + 0] = res[i + 3]; res[i + 3] = t;
  80         t = res[i + 1]; res[i + 1] = res[i + 2]; res[i + 2] = t;
  81     }
  82 }
  83
  84 static int
  85 otp_md_init (OtpKey key,
  86              const char *pwd,
  87              const char *seed,
  88              const EVP_MD *md,
  89              int le,
  90              unsigned char *res,
  91              size_t ressz)
  92 {
  93     EVP_MD_CTX *ctx;
  94     char *p;
  95     int len;
  96
  97     ctx = EVP_MD_CTX_create();
  98
  99     len = strlen(pwd) + strlen(seed);
 100     p = malloc (len + 1);
 101     if (p == NULL)
 102         return -1;
 103     strlcpy (p, seed, len + 1);
 104     strlwr (p);
 105     strlcat (p, pwd, len + 1);
 106
 107     EVP_DigestInit_ex(ctx, md, NULL);
 108     EVP_DigestUpdate(ctx, p, len);
 109     EVP_DigestFinal_ex(ctx, res, NULL);
 110
 111     EVP_MD_CTX_destroy(ctx);
 112
 113     if (le)
 114         little_endian(res, ressz);
 115
 116     free (p);
 117     compressmd (key, res, ressz);
 118     return 0;
 119 }
 120
 121 static int
 122 otp_md_next (OtpKey key,
 123              const EVP_MD *md,
 124              int le,
 125              unsigned char *res,
 126              size_t ressz)
 127 {
 128     EVP_MD_CTX *ctx;
 129
 130     ctx = EVP_MD_CTX_create();
 131
 132     EVP_DigestInit_ex(ctx, md, NULL);
 133     EVP_DigestUpdate(ctx, key, OTPKEYSIZE);
 134     EVP_DigestFinal_ex(ctx, res, NULL);
 135
 136     EVP_MD_CTX_destroy(ctx);
 137
 138     if (le)
 139         little_endian(res, ressz);
 140
 141     compressmd (key, res, ressz);
 142     return 0;
 143 }
 144
 145 static int
 146 otp_md_hash (const char *data,
 147              size_t len,
 148              const EVP_MD *md,
 149              int le,
 150              unsigned char *res,
 151              size_t ressz)
 152 {
 153     EVP_MD_CTX *ctx;
 154     ctx = EVP_MD_CTX_create();
 155
 156     EVP_DigestInit_ex(ctx, md, NULL);
 157     EVP_DigestUpdate(ctx, data, len);
 158     EVP_DigestFinal_ex(ctx, res, NULL);
 159
 160     EVP_MD_CTX_destroy(ctx);
 161
 162     if (le)
 163         little_endian(res, ressz);
 164
 165     return 0;
 166 }
 167
 168 int
 169 otp_md4_init (OtpKey key, const char *pwd, const char *seed)
 170 {
 171   unsigned char res[16];
 172   return otp_md_init (key, pwd, seed, EVP_md4(), 0, res, sizeof(res));
 173 }
 174
 175 int
 176 otp_md4_hash (const char *data,
 177               size_t len,
 178               unsigned char *res)
 179 {
 180   return otp_md_hash (data, len, EVP_md4(), 0, res, 16);
 181 }
 182
 183 int
 184 otp_md4_next (OtpKey key)
 185 {
 186   unsigned char res[16];
 187   return otp_md_next (key, EVP_md4(), 0, res, sizeof(res));
 188 }
 189
 190
 191 int
 192 otp_md5_init (OtpKey key, const char *pwd, const char *seed)
 193 {
 194   unsigned char res[16];
 195   return otp_md_init (key, pwd, seed, EVP_md5(), 0, res, sizeof(res));
 196 }
 197
 198 int
 199 otp_md5_hash (const char *data,
 200               size_t len,
 201               unsigned char *res)
 202 {
 203   return otp_md_hash (data, len, EVP_md5(), 0, res, 16);
 204 }
 205
 206 int
 207 otp_md5_next (OtpKey key)
 208 {
 209   unsigned char res[16];
 210   return otp_md_next (key, EVP_md5(), 0, res, sizeof(res));
 211 }
 212
 213 int
 214 otp_sha_init (OtpKey key, const char *pwd, const char *seed)
 215 {
 216   unsigned char res[20];
 217   return otp_md_init (key, pwd, seed, EVP_sha1(), 1, res, sizeof(res));
 218 }
 219
 220 int
 221 otp_sha_hash (const char *data,
 222               size_t len,
 223               unsigned char *res)
 224 {
 225   return otp_md_hash (data, len, EVP_sha1(), 1, res, 20);
 226 }
 227
 228 int
 229 otp_sha_next (OtpKey key)
 230 {
 231   unsigned char res[20];
 232   return otp_md_next (key, EVP_sha1(), 1, res, sizeof(res));
 233 }