Security/libsecurity_cdsa_utilities/lib/cssmdata.cpp

   1 /*
   2  * Copyright (c) 2000-2004,2006,2011-2012,2014 Apple Inc. All Rights Reserved.
   3  *
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   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,
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  18  * Please see the License for the specific language governing rights and
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  20  *
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  22  */
  23
  24
  25 //
  26 // cssmdata.cpp -- Manager different CssmData types
  27 //
  28 #include <security_cdsa_utilities/cssmdata.h>
  29 #include <security_utilities/utilities.h>
  30 #include <cstring>
  31 #include <algorithm>
  32
  33
  34 namespace Security {
  35
  36
  37 //
  38 // Comparing raw CSSM_DATA things
  39 //
  40 bool operator == (const CSSM_DATA &d1, const CSSM_DATA &d2)
  41 {
  42     if (&d1 == &d2)
  43         return true;    // identical
  44     if (d1.Length != d2.Length)
  45         return false;   // can't be
  46     if (d1.Data == d2.Data)
  47         return true;    // points to same data
  48     return !memcmp(d1.Data, d2.Data, d1.Length);
  49 }
  50
  51
  52 //
  53 // CssmData out of line members
  54 //
  55 string CssmData::toString() const
  56 {
  57     return data() ?
  58         string(reinterpret_cast<const char *>(data()), length())
  59         :
  60         string();
  61 }
  62
  63
  64 //
  65 // Conversion from/to hex digits.
  66 // This could be separate functions, or Rep templates, but we just hang
  67 // it onto generic CssmData.
  68 //
  69 string CssmData::toHex() const
  70 {
  71         static const char digits[] = "0123456789abcdef";
  72         string result;
  73         unsigned char *p = Data;
  74         for (uint32 n = 0; n < length(); n++) {
  75                 result.push_back(digits[p[n] >> 4]);
  76                 result.push_back(digits[p[n] & 0xf]);
  77         }
  78         return result;
  79 }
  80
  81 static unsigned char hexValue(char c)
  82 {
  83         static const char digits[] = "0123456789abcdef";
  84         if (const char *p = strchr(digits, tolower(c)))
  85                 return p - digits;
  86         else
  87                 return 0;
  88 }
  89
  90 void CssmData::fromHex(const char *hexDigits)
  91 {
  92         size_t bytes = strlen(hexDigits) / 2;   // (discards malformed odd end)
  93         length(bytes);  // (will assert if we try to grow it)
  94         for (size_t n = 0; n < bytes; n++) {
  95                 Data[n] = hexValue(hexDigits[2*n]) << 4 | hexValue(hexDigits[2*n+1]);
  96         }
  97 }
  98
  99
 100 //
 101 // Conversion from/to OID strings.
 102 // These are not strict; invalid inputs are not necessarily flagged as errors.
 103 //
 104 static unsigned long getOid(const CssmData &data, unsigned int &pos)
 105 {
 106         unsigned long q = 0;
 107         do {
 108                 q = q * 128 + (data.byte(pos) & ~0x80);
 109         } while (pos < data.length() && data.byte(pos++) & 0x80);
 110         return q;
 111 }
 112
 113 string CssmData::toOid() const
 114 {
 115         if (length() == 0)
 116                 return "";
 117
 118         unsigned int pos = 0;
 119
 120         // first byte is composite (q1,q2)
 121         char buffer[10];
 122         unsigned long oid1 = getOid(*this, pos);
 123         unsigned long q1 = min(oid1 / 40, 2ul);
 124         snprintf(buffer, sizeof(buffer), "%lu.%lu", q1, oid1 - q1 * 40);
 125         string s = buffer;
 126
 127         // now for the rest
 128         while (pos < length()) {
 129                 char buffer[20];
 130                 snprintf(buffer, sizeof(buffer), ".%lu", getOid(*this, pos));
 131                 s += buffer;
 132         }
 133         return s;
 134 }
 135
 136 static void putOid(CssmOwnedData &data, unsigned long id)
 137 {
 138         unsigned char buffer[sizeof(unsigned long) * 2];        // * (8/7) + 1, conservative
 139         unsigned char *p = buffer + sizeof(buffer);
 140         do {
 141                 *--p = 0x80 | (id & 0x7F);              // last 7 bits, high bit set
 142         } while ((id >>= 7) > 0);
 143         buffer[sizeof(buffer) - 1] &= ~0x80;    // clear last high bit (end of number)
 144         data.append(p, buffer + sizeof(buffer) - p); // append generated byte string
 145 }
 146
 147 //
 148 // Convert OID string (1.2.3...) into CssmOid form.
 149 // Allocates the data, replacing current contents.
 150 // Will not process oid elements out of unsigned long range.
 151 //
 152 void CssmOwnedData::fromOid(const char *oid)
 153 {
 154         this->length(0);                // make empty
 155
 156         // first two elements get combined in weird&wacky ways
 157         unsigned long q1 = strtoul(oid, (char **)&oid, 10);
 158         if (*oid++ != '.')
 159                 return;
 160         unsigned long q2 = strtoul(oid, (char **)&oid, 10);
 161         putOid(*this, 40 * q1 + q2);
 162         while (oid[0] == '.') {
 163                 oid++;
 164                 putOid(*this, strtoul(oid, (char **)&oid, 10));
 165         }
 166 }
 167
 168
 169 //
 170 // Managed data objects
 171 //
 172 CssmManagedData::~CssmManagedData()
 173 { }
 174
 175
 176 //
 177 // CssmOwnedData
 178 //
 179 void CssmOwnedData::set(CssmManagedData &source)
 180 {
 181     if (source.length() == 0) {                                 // source is empty
 182         reset();                                                                // so just clear old data
 183     } else if (allocator == source.allocator) { // compatible allocators
 184         if (referent.data() == source.data()) { // same data *and* we own it?!
 185             assert(this == &source);                    //  this better *be* me!
 186         } else {                                                                // different data
 187             reset();                                                    // give up our old data
 188             referent = source.release();                // take over source's data
 189         }
 190     } else {                                                                    // different allocators
 191         copy(source);                                                   // make a copy with our allocator
 192         source.reset();                                                 // release source's data
 193     }
 194 }
 195
 196
 197 //
 198 // CssmAutoData
 199 //
 200 CssmData CssmAutoData::release()
 201 {
 202     CssmData result = mData;
 203     mData.clear();
 204     return result;
 205 }
 206
 207 void CssmAutoData::reset()
 208 {
 209     allocator.free(mData);
 210     mData.clear();
 211 }
 212
 213
 214 //
 215 // CssmRemoteData
 216 //
 217 CssmData CssmRemoteData::release()
 218 {
 219     iOwnTheData = false;
 220     return referent;
 221 }
 222
 223 void CssmRemoteData::reset()
 224 {
 225     if (iOwnTheData)
 226         allocator.free(referent);
 227     referent.clear();
 228 }
 229
 230
 231 //
 232 // Date stuff
 233 //
 234 CssmDateData::CssmDateData(const CSSM_DATE &date)
 235 : CssmData(buffer, sizeof(buffer))
 236 {
 237         memcpy(buffer, date.Year, 4);
 238         memcpy(buffer + 4, date.Month, 2);
 239         memcpy(buffer + 6, date.Day, 2);
 240 }
 241
 242
 243 CssmData& CssmOwnedData::get() const throw()
 244 {
 245         return referent;
 246 }
 247
 248 }       // end namespace Security