ossl_hash.h

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    1 /*
    2  * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
    3  *
    4  * Licensed under the OpenSSL license (the "License").  You may not use
    5  * this file except in compliance with the License.  You can obtain a copy
    6  * in the file LICENSE in the source distribution or at
    7  * https://www.openssl.org/source/license.html
    8  *
    9  * $FreeBSD$
   10  */
   11 
   12 /*
   13  * Derived from include/crypto/md32_common.h
   14  *
   15  * HASH_UPDATE and HASH_FINAL have been updated to work with the
   16  * auth_hash interface.
   17  */
   18 
   19 #if defined(DATA_ORDER_IS_BIG_ENDIAN)
   20 
   21 # define HOST_c2l(c,l)  (l =(((unsigned long)(*((c)++)))<<24),          \
   22                          l|=(((unsigned long)(*((c)++)))<<16),          \
   23                          l|=(((unsigned long)(*((c)++)))<< 8),          \
   24                          l|=(((unsigned long)(*((c)++)))    )           )
   25 # define HOST_l2c(l,c)  (*((c)++)=(unsigned char)(((l)>>24)&0xff),      \
   26                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
   27                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
   28                          *((c)++)=(unsigned char)(((l)    )&0xff),      \
   29                          l)
   30 
   31 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
   32 
   33 # define HOST_c2l(c,l)  (l =(((unsigned long)(*((c)++)))    ),          \
   34                          l|=(((unsigned long)(*((c)++)))<< 8),          \
   35                          l|=(((unsigned long)(*((c)++)))<<16),          \
   36                          l|=(((unsigned long)(*((c)++)))<<24)           )
   37 # define HOST_l2c(l,c)  (*((c)++)=(unsigned char)(((l)    )&0xff),      \
   38                          *((c)++)=(unsigned char)(((l)>> 8)&0xff),      \
   39                          *((c)++)=(unsigned char)(((l)>>16)&0xff),      \
   40                          *((c)++)=(unsigned char)(((l)>>24)&0xff),      \
   41                          l)
   42 
   43 #endif
   44 
   45 /*
   46  * Time for some action :-)
   47  */
   48 
   49 static int
   50 HASH_UPDATE(void *c_, const void *data_, unsigned int len)
   51 {
   52     HASH_CTX *c = c_;
   53     const unsigned char *data = data_;
   54     unsigned char *p;
   55     HASH_LONG l;
   56     size_t n;
   57 
   58     if (len == 0)
   59         return 0;
   60 
   61     l = (c->Nl + (((HASH_LONG) len) << 3)) & 0xffffffffUL;
   62     if (l < c->Nl)              /* overflow */
   63         c->Nh++;
   64     c->Nh += (HASH_LONG) (len >> 29); /* might cause compiler warning on
   65                                        * 16-bit */
   66     c->Nl = l;
   67 
   68     n = c->num;
   69     if (n != 0) {
   70         p = (unsigned char *)c->data;
   71 
   72         if (len >= HASH_CBLOCK || len + n >= HASH_CBLOCK) {
   73             memcpy(p + n, data, HASH_CBLOCK - n);
   74             HASH_BLOCK_DATA_ORDER(c, p, 1);
   75             n = HASH_CBLOCK - n;
   76             data += n;
   77             len -= n;
   78             c->num = 0;
   79             /*
   80              * We use memset rather than OPENSSL_cleanse() here deliberately.
   81              * Using OPENSSL_cleanse() here could be a performance issue. It
   82              * will get properly cleansed on finalisation so this isn't a
   83              * security problem.
   84              */
   85             memset(p, 0, HASH_CBLOCK); /* keep it zeroed */
   86         } else {
   87             memcpy(p + n, data, len);
   88             c->num += (unsigned int)len;
   89             return 0;
   90         }
   91     }
   92 
   93     n = len / HASH_CBLOCK;
   94     if (n > 0) {
   95         HASH_BLOCK_DATA_ORDER(c, data, n);
   96         n *= HASH_CBLOCK;
   97         data += n;
   98         len -= n;
   99     }
  100 
  101     if (len != 0) {
  102         p = (unsigned char *)c->data;
  103         c->num = (unsigned int)len;
  104         memcpy(p, data, len);
  105     }
  106     return 0;
  107 }
  108 
  109 static void
  110 HASH_FINAL(uint8_t *md, void *c_)
  111 {
  112     HASH_CTX *c = c_;
  113     unsigned char *p = (unsigned char *)c->data;
  114     size_t n = c->num;
  115 
  116     p[n] = 0x80;                /* there is always room for one */
  117     n++;
  118 
  119     if (n > (HASH_CBLOCK - 8)) {
  120         memset(p + n, 0, HASH_CBLOCK - n);
  121         n = 0;
  122         HASH_BLOCK_DATA_ORDER(c, p, 1);
  123     }
  124     memset(p + n, 0, HASH_CBLOCK - 8 - n);
  125 
  126     p += HASH_CBLOCK - 8;
  127 #if   defined(DATA_ORDER_IS_BIG_ENDIAN)
  128     (void)HOST_l2c(c->Nh, p);
  129     (void)HOST_l2c(c->Nl, p);
  130 #elif defined(DATA_ORDER_IS_LITTLE_ENDIAN)
  131     (void)HOST_l2c(c->Nl, p);
  132     (void)HOST_l2c(c->Nh, p);
  133 #endif
  134     p -= HASH_CBLOCK;
  135     HASH_BLOCK_DATA_ORDER(c, p, 1);
  136     c->num = 0;
  137     OPENSSL_cleanse(p, HASH_CBLOCK);
  138 
  139 #ifndef HASH_MAKE_STRING
  140 # error "HASH_MAKE_STRING must be defined!"
  141 #else
  142     HASH_MAKE_STRING(c, md);
  143 #endif
  144 
  145     return;
  146 }

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FreeBSD/Linux Kernel Cross Reference sys/crypto/openssl/ossl_hash.h

FreeBSD/Linux Kernel Cross Reference
sys/crypto/openssl/ossl_hash.h