Security-59306.11.20.tar.gz

[apple/security.git] / OSX / utilities / der_string.c

diff --git a/OSX/utilities/der_string.c b/OSX/utilities/der_string.c
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+++ b/OSX/utilities/der_string.c
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+/*
+ * Copyright (c) 2012,2014 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ * 
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ * 
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+
+#include <stdio.h>
+
+#include "utilities/SecCFRelease.h"
+#include "utilities/der_plist.h"
+#include "utilities/der_plist_internal.h"
+
+#include <corecrypto/ccder.h>
+#include <CoreFoundation/CoreFoundation.h>
+
+
+const uint8_t* der_decode_string(CFAllocatorRef allocator, CFOptionFlags mutability,
+                                 CFStringRef* string, CFErrorRef *error,
+                                 const uint8_t* der, const uint8_t *der_end)
+{
+    if (NULL == der)
+        return NULL;
+
+    size_t payload_size = 0;
+    const uint8_t *payload = ccder_decode_tl(CCDER_UTF8_STRING, &payload_size, der, der_end);
+
+    if (NULL == payload || (ssize_t) (der_end - payload) < (ssize_t) payload_size){
+        SecCFDERCreateError(kSecDERErrorUnknownEncoding, CFSTR("Unknown string encoding"), NULL, error);
+        return NULL;
+    }
+
+    *string = CFStringCreateWithBytes(allocator, payload, payload_size, kCFStringEncodingUTF8, false);
+
+    if (NULL == *string) {
+        SecCFDERCreateError(kSecDERErrorAllocationFailure, CFSTR("String allocation failed"), NULL, error);
+        return NULL;
+    }
+
+    return payload + payload_size;
+}
+
+
+size_t der_sizeof_string(CFStringRef str, CFErrorRef *error)
+{
+    const CFIndex str_length    = CFStringGetLength(str);
+    const CFIndex maximum       = CFStringGetMaximumSizeForEncoding(str_length, kCFStringEncodingUTF8);
+
+    CFIndex encodedLen = 0;
+    CFIndex converted = CFStringGetBytes(str, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, NULL, maximum, &encodedLen);
+
+    return ccder_sizeof(CCDER_UTF8_STRING, (converted == str_length) ? encodedLen : 0);
+}
+
+
+uint8_t* der_encode_string(CFStringRef string, CFErrorRef *error,
+                           const uint8_t *der, uint8_t *der_end)
+{
+    // Obey the NULL allowed rules.
+    if (!der_end)
+        return NULL;
+
+    const CFIndex str_length = CFStringGetLength(string);
+
+    ptrdiff_t der_space = der_end - der;
+    CFIndex bytes_used = 0;
+    uint8_t *buffer = der_end - der_space;
+    CFIndex converted = CFStringGetBytes(string, CFRangeMake(0, str_length), kCFStringEncodingUTF8, 0, false, buffer, der_space, &bytes_used);
+    if (converted != str_length){
+        SecCFDERCreateError(kSecDERErrorUnsupportedCFObject, CFSTR("String extraction failed"), NULL, error);
+        return NULL;
+    }
+
+    return ccder_encode_tl(CCDER_UTF8_STRING, bytes_used, der,
+           ccder_encode_body(bytes_used, buffer, der, der_end));
+
+}