X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/72a12576750f52947eb043106ba5c12c0d07decf..b1ab9ed8d0e0f1c3b66d7daa8fd5564444c56195:/libsecurity_transform/lib/Digest_block.c

diff --git a/libsecurity_transform/lib/Digest_block.c b/libsecurity_transform/lib/Digest_block.c
new file mode 100644
index 00000000..cf444698
--- /dev/null
+++ b/libsecurity_transform/lib/Digest_block.c
@@ -0,0 +1,85 @@
+/*
+ *  Digest_block.cpp
+ *  libsecurity_transform
+ *
+ *  Created by JOsborne on 2/20/10.
+ *  Copyright 2010 Apple. All rights reserved.
+ *
+ */
+
+#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;
+}