X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/5dd5f9ec28f304ca377c42fd7f711d6cf12b90e1..5c19dc3ae3bd8e40a9c028b0deddd50ff337692c:/OSX/libsecurity_apple_csp/lib/castContext.cpp

diff --git a/OSX/libsecurity_apple_csp/lib/castContext.cpp b/OSX/libsecurity_apple_csp/lib/castContext.cpp
new file mode 100644
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+++ b/OSX/libsecurity_apple_csp/lib/castContext.cpp
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+/*
+ * Copyright (c) 2000-2001,2011-2012,2014 Apple Inc. All Rights Reserved.
+ * 
+ * The contents of this file constitute Original Code as defined in and are
+ * subject to the Apple Public Source License Version 1.2 (the 'License').
+ * You may not use this file except in compliance with the License. Please obtain
+ * a copy of the License at http://www.apple.com/publicsource and read it before
+ * using this file.
+ * 
+ * This 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.
+ */
+
+
+/*
+ * castContext.cpp - glue between BlockCrytpor and CommonCrypto CAST128 (CAST5)
+ *				 implementation
+ *
+ */
+ 
+#include "castContext.h"
+
+CastContext::CastContext(AppleCSPSession &session) :
+    BlockCryptor(session),
+    mCastKey(NULL),
+    mInitFlag(false),
+    mRawKeySize(0)
+{
+}
+
+
+
+CastContext::~CastContext()
+{
+ 	deleteKey();
+}
+
+void CastContext::deleteKey()
+{
+    if (mCastKey != NULL) {
+        CCCryptorRelease(mCastKey);
+    }
+    mCastKey = NULL;
+	mInitFlag = false;
+}
+
+/* 
+ * Standard CSPContext init, called from CSPFullPluginSession::init().
+ * Reusable, e.g., query followed by en/decrypt.
+ */
+void CastContext::init( 
+	const Context &context, 
+	bool encrypting)
+{
+	if(mInitFlag && !opStarted()) {
+		return;
+	}
+
+	CSSM_SIZE	keyLen;
+	uint8 		*keyData = NULL;
+	bool		sameKeySize = false;
+	
+	/* obtain key from context */
+	symmetricKeyBits(context, session(), CSSM_ALGID_CAST, 
+		encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
+		keyData, keyLen);
+	if((keyLen < kCCKeySizeMinCAST) || (keyLen > kCCKeySizeMaxCAST)) {
+		CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
+	}
+	
+	/*
+	 * Delete existing key if key size changed
+	 */
+	if(mRawKeySize == keyLen) {
+		sameKeySize = true;
+	}
+	else {
+		deleteKey();
+	}
+
+	/* init key only if key size or key bits have changed */
+	if(!sameKeySize || memcmp(mRawKey, keyData, mRawKeySize)) {
+        (void) CCCryptorCreateWithMode(0, kCCModeECB, kCCAlgorithmCAST, ccDefaultPadding, NULL, keyData, keyLen, NULL, 0, 0, 0, &mCastKey);
+	
+		/* save this raw key data */
+		memmove(mRawKey, keyData, keyLen); 
+		mRawKeySize = (uint32)keyLen;
+	}
+	
+	/* Finally, have BlockCryptor do its setup */
+	setup(kCCBlockSizeCAST, context);
+	mInitFlag = true;
+}	
+
+/*
+ * Functions called by BlockCryptor
+ */
+void CastContext::encryptBlock(
+	const void		*plainText,			// length implied (one block)
+	size_t			plainTextLen,
+	void			*cipherText,	
+	size_t			&cipherTextLen,		// in/out, throws on overflow
+	bool			final)				// ignored
+{
+	if(plainTextLen != kCCBlockSizeCAST) {
+		CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
+	}
+	if(cipherTextLen < kCCBlockSizeCAST) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+    (void) CCCryptorEncryptDataBlock(mCastKey, NULL, plainText, kCCBlockSizeCAST, cipherText);
+
+	cipherTextLen = kCCBlockSizeCAST;
+}
+
+void CastContext::decryptBlock(
+	const void		*cipherText,		// length implied (one block)
+	size_t			cipherTextLen,
+	void			*plainText,	
+	size_t			&plainTextLen,		// in/out, throws on overflow
+	bool			final)				// ignored
+{
+	if(plainTextLen < kCCBlockSizeCAST) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+    (void) CCCryptorDecryptDataBlock(mCastKey, NULL, cipherText, kCCBlockSizeCAST, plainText);
+
+	plainTextLen = kCCBlockSizeCAST;
+}