Security-57031.1.35.tar.gz

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

diff --git a/Security/libsecurity_transform/lib/Digest_block.c b/Security/libsecurity_transform/lib/Digest_block.c
new file mode 100644 (file)
index 0000000..968aae4
--- /dev/null
+++ b/Security/libsecurity_transform/lib/Digest_block.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright (c) 2010-2011,2014 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 "Digest_block.h"
+#include "SecCustomTransform.h"
+#include <CommonCrypto/CommonDigest.h>
+#include "Utilities.h"
+
+extern const CFStringRef kSecDigestMD2, kSecDigestMD4, kSecDigestMD5, kSecDigestSHA1, kSecDigestSHA2;
+extern const CFStringRef kSecDigestTypeAttribute, kSecDigestLengthAttribute;
+
+
+static CFStringRef kCustomDigestTransformName = CFSTR("com.apple.security.digest");
+
+SecTransformRef SecDigestTransformCreate_block(SecProviderRef device, CFTypeRef digestType, CFIndex digestLength, CFErrorRef* error) {
+       static dispatch_once_t inited;
+       __block CFStringRef current_algo;
+       __block CFIndex current_length;
+       
+       dispatch_once(&inited, ^{
+               SecTransformRegister(kCustomDigestTransformName, ^(CFStringRef name, SecTransformRebindActionBlock rebind) {
+                       rebind(kSecTransformActionProcessData, NULL, ^(SecTransformRef tr, CFDataRef d, SecTransformSendAttribute set) {
+                               set(kSecDigestTypeAttribute, kSecDigestSHA2);
+                       });
+                       rebind(SecTransformSetAttributeAction, NULL, ^(SecTransformRef tr, CFStringRef name, CFTypeRef value, SecTransformSendAttribute set) {
+                               Boolean algo_changed = FALSE;
+                               if (name == kSecDigestTypeAttribute || CFStringCompare(kSecDigestTypeAttribute, name, 0) == kCFCompareEqualTo) {
+                                       algo_changed = TRUE;
+                                       current_algo = CFStringCreateCopy(NULL, (CFStringRef)value);
+
+                               } else if (name == kSecDigestLengthAttribute || CFStringCompare(kSecDigestLengthAttribute, name, 0) == kCFCompareEqualTo) {
+                                       algo_changed = TRUE;
+                                       CFNumberGetValue(value, kCFNumberCFIndexType, &current_length);
+                               } else if (CFStringCompare(kSecTransformInputAttributeName, name, 0) == kCFCompareEqualTo) {
+                                       return (CFTypeRef)CreateSecTransformErrorRef(kSecTransformErrorInvalidType, "The type %@ is invalid.", name);
+                               } else {
+                                       return (CFTypeRef)CreateSecTransformErrorRef(kSecTransformErrorInvalidType, "The type %@ is invalid.", name);
+                               }
+                               if (!algo_changed) {
+                                       return value;
+                               }
+                               
+                               if (current_algo == kSecDigestSHA2 || CFStringCompare(current_algo, kSecDigestSHA2, 0) == kCFCompareEqualTo) {
+                                       switch (current_length) {
+                                               case 0:
+                                               case 512: {
+                                                       __block CC_SHA512_CTX cc_context;
+                                                       CC_SHA512_Init(&cc_context);
+                                                       rebind(kSecTransformActionProcessData, NULL, ^(SecTransformRef tr, CFDataRef d, SecTransformSendAttribute set) {
+                                                               if (d) {
+                                                                       CC_SHA512_Update(&cc_context, CFDataGetBytePtr(d), CFDataGetLength(d));
+                                                                       return SecTransformNoData();
+                                                               } else {
+                                                                       u_int8_t digest_buffer[CC_SHA512_DIGEST_LENGTH];
+
+                                                                       CC_SHA512_Final(digest_buffer, &cc_context);
+                                                                       set(kSecTransformOutputAttributeName, CFDataCreate(NULL, digest_buffer, CC_SHA512_DIGEST_LENGTH));
+                                                                       return NULL;
+                                                               }
+                                                       });
+                                                       return value;
+                                               }
+                                       }
+                                       return (CFTypeRef)CreateSecTransformErrorRef(kSecTransformErrorInvalidLength, "Invalid length.");
+                               } else {
+                                       return (CFTypeRef)CreateSecTransformErrorRef(kSecTransformErrorInvalidAlgorithm, "Invalid algorithm.");
+                               }
+                       });
+               }, NULL);
+       });
+       
+       SecTransformRef dt = SecTransformCreate(kCustomDigestTransformName, NULL);
+       SecTransformSetAttribute(dt, kSecDigestTypeAttribute, digestType, error);
+       CFNumberRef dlen = CFNumberCreate(NULL, kCFNumberCFIndexType, &digestLength);
+       SecTransformSetAttribute(dt, kSecDigestLengthAttribute, dlen, error);
+       CFRelease(dlen);
+       
+       return dt;
+}