Security-57031.1.35.tar.gz

[apple/security.git] / Security / libsecurity_transform / lib / CEncryptDecrypt.c

diff --git a/Security/libsecurity_transform/lib/CEncryptDecrypt.c b/Security/libsecurity_transform/lib/CEncryptDecrypt.c
new file mode 100644 (file)
index 0000000..2c960f7
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+++ b/Security/libsecurity_transform/lib/CEncryptDecrypt.c
@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2012 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 <CoreFoundation/CoreFoundation.h>
+#include "corecrypto/ccsha1.h"
+#include "corecrypto/ccrsa_priv.h"
+#include "corecrypto/ccrng_system.h"
+#include "corecrypto/ccn.h"
+#include "stdio.h"
+#include "misc.h"
+
+// corecrypto headers don't like C++ (on a deaper level then extern "C" {} can fix
+// so we need a C "shim" for all our corecrypto use.
+
+#warning "This declaration should be in some headers"
+CFDataRef oaep_padding_via_c(int desired_message_length, CFDataRef dataValue);
+CFDataRef oaep_padding_via_c(int desired_message_length, CFDataRef dataValue)
+{
+       cc_unit paddingBuffer[ccn_nof_size(desired_message_length)];
+       bzero(paddingBuffer, sizeof(cc_unit) * ccn_nof_size(desired_message_length)); // XXX needed??
+       static dispatch_once_t randomNumberGenneratorInitialzed;
+       static struct ccrng_system_state rng;
+       dispatch_once(&randomNumberGenneratorInitialzed, ^{
+        ccrng_system_init(&rng);
+       });
+       
+    ccrsa_oaep_encode(ccsha1_di(),
+                      (struct ccrng_state*)&rng,
+                      sizeof(paddingBuffer), (cc_unit*)paddingBuffer,
+                      CFDataGetLength(dataValue), CFDataGetBytePtr(dataValue));
+    ccn_swap(ccn_nof_size(sizeof(paddingBuffer)), (cc_unit*)paddingBuffer);
+       
+    CFDataRef paddedValue = CFDataCreate(NULL, (UInt8*)paddingBuffer, desired_message_length);
+       return paddedValue ? paddedValue : (void*)GetNoMemoryErrorAndRetain();
+}
+
+#warning "This declaration should be in some headers"
+CFDataRef oaep_unpadding_via_c(CFDataRef encodedMessage);
+CFDataRef oaep_unpadding_via_c(CFDataRef encodedMessage)
+{
+       size_t mlen = CFDataGetLength(encodedMessage);
+       cc_size n = ccn_nof_size(mlen);
+       cc_unit paddingBuffer[n];
+       UInt8 plainText[mlen];
+       
+       ccn_read_uint(n, paddingBuffer, mlen, CFDataGetBytePtr(encodedMessage));
+       size_t plainTextLength = mlen;
+    int err = ccrsa_oaep_decode(ccsha1_di(), &plainTextLength, plainText, mlen, paddingBuffer);
+       
+    if (err) {
+               // XXX should make a CFError or something.
+               return (void*)fancy_error(CFSTR("CoreCrypto"), err, CFSTR("OAEP decode error"));
+    }
+       CFDataRef result = CFDataCreate(NULL, (UInt8*)plainText, plainTextLength);
+       return result;
+}