// Der encoding/decoding
const uint8_t* der_decode_RecoveryKeyBag(CFAllocatorRef allocator,
SOSRecoveryKeyBagRef* RecoveryKeyBag, CFErrorRef *error,
const uint8_t* der, const uint8_t *der_end) {
if (der == NULL) return der;
const uint8_t *result = NULL;
SOSRecoveryKeyBagRef rb = CFTypeAllocate(SOSRecoveryKeyBag, struct __OpaqueSOSRecoveryKeyBag, allocator);
require_quiet(SecAllocationError(rb, error, CFSTR("Recovery bag allocation failed")), fail);
const uint8_t *sequence_end = NULL;
der = ccder_decode_sequence_tl(&sequence_end, der, der_end);
require_quiet(sequence_end == der_end, fail);
der = der_decode_string(kCFAllocatorDefault, kCFPropertyListImmutable, &rb->accountDSID, error, der, sequence_end);
rb->generation = SOSGenCountCreateFromDER(kCFAllocatorDefault, error, &der, sequence_end);
der = ccder_decode_uint64(&rb->rkbVersion, der, sequence_end);
der = der_decode_data(allocator, kCFPropertyListImmutable, &rb->recoveryKeyBag, error, der, sequence_end);
require_quiet(SecRequirementError(der == der_end, error, CFSTR("Extra space in sequence")), fail);
if (RecoveryKeyBag) CFTransferRetained(*RecoveryKeyBag, rb);
result = der;
fail:
CFReleaseNull(rb);
return result;
}
const uint8_t* der_decode_plist(CFAllocatorRef allocator, CFOptionFlags mutability,
CFPropertyListRef* pl, CFErrorRef *error,
const uint8_t* der, const uint8_t *der_end)
{ if (NULL == der)
return NULL;
if (ccder_decode_tag == NULL)
{
printf("ccder functions missing, check /usr/lib/system/libcommonCrypto.dylib\n");
return NULL;
}
ccder_tag tag;
if (NULL == ccder_decode_tag(&tag, der, der_end))
return NULL;
switch (tag) {
case CCDER_NULL:
return der_decode_null(allocator, mutability, (CFNullRef*)pl, error, der, der_end);
case CCDER_BOOLEAN:
return der_decode_boolean(allocator, mutability, (CFBooleanRef*)pl, error, der, der_end);
case CCDER_OCTET_STRING:
return der_decode_data(allocator, mutability, (CFDataRef*)pl, error, der, der_end);
case CCDER_GENERALIZED_TIME:
return der_decode_date(allocator, mutability, (CFDateRef*)pl, error, der, der_end);
case CCDER_CONSTRUCTED_SEQUENCE:
return der_decode_array(allocator, mutability, (CFArrayRef*)pl, error, der, der_end);
case CCDER_UTF8_STRING:
return der_decode_string(allocator, mutability, (CFStringRef*)pl, error, der, der_end);
case CCDER_INTEGER:
return der_decode_number(allocator, mutability, (CFNumberRef*)pl, error, der, der_end);
case CCDER_CONSTRUCTED_SET:
return der_decode_dictionary(allocator, mutability, (CFDictionaryRef*)pl, error, der, der_end);
default:
SecCFDERCreateError(kSecDERErrorUnsupportedDERType, CFSTR("Unsupported DER Type"), NULL, error);
return NULL;
}
}
