Security/libsecurity_ssl/lib/sslUtils.c

   1 /*
   2  * Copyright (c) 1999-2001,2005-2008,2010-2012,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 /*
  25  * sslUtils.c - Misc. OS independant SSL utility functions
  26  */
  27
  28 /* THIS FILE CONTAINS KERNEL CODE */
  29
  30 #include "sslUtils.h"
  31 #include "sslTypes.h"
  32 #include "sslDebug.h"
  33
  34 #include <AssertMacros.h>
  35
  36 #ifndef NDEBUG
  37 void SSLDump(const unsigned char *data, unsigned long len)
  38 {
  39     unsigned long i;
  40     for(i=0;i<len;i++)
  41     {
  42         if((i&0xf)==0) printf("%04lx :",i);
  43         printf(" %02x", data[i]);
  44         if((i&0xf)==0xf) printf("\n");
  45     }
  46     printf("\n");
  47 }
  48 #endif
  49
  50 unsigned int
  51 SSLDecodeInt(const uint8_t *p, size_t length)
  52 {
  53     unsigned int val = 0;
  54     check(length > 0 && length <= 4); //anything else would be an internal error.
  55     while (length--)
  56         val = (val << 8) | *p++;
  57     return val;
  58 }
  59
  60 uint8_t *
  61 SSLEncodeInt(uint8_t *p, size_t value, size_t length)
  62 {
  63     unsigned char *retVal = p + length; /* Return pointer to char after int */
  64     check(length > 0 && length <= 4);  //anything else would be an internal error.
  65     while (length--)                    /* Assemble backwards */
  66     {   p[length] = (uint8_t)value;     /* Implicit masking to low byte */
  67         value >>= 8;
  68     }
  69     return retVal;
  70 }
  71
  72 size_t
  73 SSLDecodeSize(const uint8_t *p, size_t length)
  74 {
  75     unsigned int val = 0;
  76     check(length > 0 && length <= 4); //anything else would be an internal error.
  77     while (length--)
  78         val = (val << 8) | *p++;
  79     return val;
  80 }
  81
  82 uint8_t *
  83 SSLEncodeSize(uint8_t *p, size_t value, size_t length)
  84 {
  85     unsigned char *retVal = p + length; /* Return pointer to char after int */
  86     check(length > 0 && length <= 4);  //anything else would be an internal error.
  87     while (length--)                    /* Assemble backwards */
  88     {   p[length] = (uint8_t)value;     /* Implicit masking to low byte */
  89         value >>= 8;
  90     }
  91     return retVal;
  92 }
  93
  94
  95 uint8_t *
  96 SSLEncodeUInt64(uint8_t *p, uint64_t value)
  97 {
  98     p = SSLEncodeInt(p, (value>>32)&0xffffffff, 4);
  99     return SSLEncodeInt(p, value&0xffffffff, 4);
 100 }
 101
 102
 103 void
 104 IncrementUInt64(sslUint64 *v)
 105 {
 106     (*v)++;
 107 }
 108
 109 void
 110 SSLDecodeUInt64(const uint8_t *p, size_t length, uint64_t *v)
 111 {
 112     check(length > 0 && length <= 8);
 113     if(length<=4) {
 114         *v=SSLDecodeInt(p, length);
 115     } else {
 116         *v=((uint64_t)SSLDecodeInt(p, length-4))<<32 | SSLDecodeInt(p+length-4, 4);
 117     }
 118 }
 119
 120
 121 #if     SSL_DEBUG
 122
 123 const char *protocolVersStr(SSLProtocolVersion prot)
 124 {
 125         switch(prot) {
 126         case SSL_Version_Undetermined: return "SSL_Version_Undetermined";
 127         case SSL_Version_2_0: return "SSL_Version_2_0";
 128         case SSL_Version_3_0: return "SSL_Version_3_0";
 129         case TLS_Version_1_0: return "TLS_Version_1_0";
 130         case TLS_Version_1_1: return "TLS_Version_1_1";
 131         case TLS_Version_1_2: return "TLS_Version_1_2";
 132         default: sslErrorLog("protocolVersStr: bad prot\n"); return "BAD PROTOCOL";
 133         }
 134         return NULL;    /* NOT REACHED */
 135 }
 136
 137 #endif  /* SSL_DEBUG */
 138
 139
 140