static CFDataRef
digestString(CFStringRef str)
{
CFDataRef retval = NULL;
CFErrorRef error = NULL;
CFDataRef inputString = CFStringCreateExternalRepresentation(kCFAllocatorDefault, str, kCFStringEncodingUTF8, 0xff);
SecTransformRef digestTrans = SecDigestTransformCreate(kSecDigestSHA2, 256, &error);
if(error == NULL) {
SecTransformSetAttribute(digestTrans, kSecTransformInputAttributeName, inputString, &error);
if(error == NULL) {
retval = SecTransformExecute(digestTrans, &error);
if(retval == NULL) {
secDebug(ASL_LEVEL_ERR, "Couldn't create digest %s\n", CFStringGetCStringPtr(CFErrorCopyFailureReason(error), kCFStringEncodingUTF8));
}
}
CFRelease(digestTrans);
}
CFRelease(inputString);
return retval;
}
CFDataRef APCreateHashFromDictionary(CFDictionaryRef dict)
{
__block CFErrorRef error = NULL;
__block SecTransformRef hashFunction = NULL;
void(^cleanup)(void) = ^(void) {
if (error != NULL) {
CFShow(error);
CFRelease(error);
error = NULL;
}
if (hashFunction != NULL) {
CFRelease(hashFunction);
hashFunction = NULL;
}
};
// Get the number of elements
CFIndex count = CFDictionaryGetCount(dict);
// Load the keys and build up the key array
CFMutableArrayRef keyArray = CFArrayCreateMutable(kCFAllocatorDefault, count, NULL);
CFStringRef keys[count];
CFDictionaryGetKeysAndValues(dict, (const void**)&keys, NULL);
for (int idx = 0; idx < count; idx++)
{
// Skip the signature key
if (CFStringCompare(keys[idx], CFSTR("Signature"), 0) == kCFCompareEqualTo) {
continue;
}
CFArrayAppendValue(keyArray, keys[idx]);
}
// Sort the array
int context = kCFCompareCaseInsensitive;
CFArraySortValues(keyArray, CFRangeMake(0, count-1), (CFComparatorFunction)CFStringCompare, &context);
// Build the data
CFMutableDataRef dictData = CFDataCreateMutable(kCFAllocatorDefault, 0);
int keyCount = CFArrayGetCount(keyArray);
for (int keyIndex = 0; keyIndex < keyCount; keyIndex++)
{
CFStringRef key = CFArrayGetValueAtIndex(keyArray, keyIndex);
CFStringRef value = CFDictionaryGetValue(dict, key);
CFDataRef valueData = CFStringCreateExternalRepresentation(kCFAllocatorDefault,
value,
kCFStringEncodingUTF8,
0);
const UInt8 *valueBuffer = CFDataGetBytePtr(valueData);
CFDataAppendBytes(dictData, valueBuffer, CFDataGetLength(valueData));
CFRelease(valueData);
}
// Hash the data
hashFunction = SecDigestTransformCreate(kSecDigestSHA1, 0, &error);
if (error != NULL) {
CFRelease(dictData);
cleanup();
return NULL;
}
SecTransformSetAttribute(hashFunction,
kSecTransformInputAttributeName,
dictData,
&error);
CFDataRef hashData = SecTransformExecute(hashFunction, &error);
CFRelease(dictData);
if (error != NULL) {
cleanup();
if (hashData) {
CFRelease(hashData);
}
return NULL;
}
cleanup();
return hashData;
}
