Security-55471.tar.gz

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

diff --git a/utilities/src/der_string.c b/utilities/src/der_string.c
new file mode 100644 (file)
index 0000000..67199f3
--- /dev/null
+++ b/utilities/src/der_string.c
@@ -0,0 +1,78 @@
+//
+//  der_string.c
+//  utilities
+//
+//  Created by Mitch Adler on 6/18/12.
+//  Copyright (c) 2012 Apple Inc. All rights reserved.
+//
+
+#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 || (der_end - payload) < 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(kSecDERErrorUnderlyingError, 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));
+
+}