X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/72a12576750f52947eb043106ba5c12c0d07decf..b1ab9ed8d0e0f1c3b66d7daa8fd5564444c56195:/libsecurity_apple_csp/lib/bfContext.cpp

diff --git a/libsecurity_apple_csp/lib/bfContext.cpp b/libsecurity_apple_csp/lib/bfContext.cpp
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+++ b/libsecurity_apple_csp/lib/bfContext.cpp
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+/*
+ * Copyright (c) 2000-2001 Apple Computer, 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.
+ */
+
+
+/*
+ * bfContext.cpp - glue between BlockCrytpor and ssleay Blowfish
+ *				 implementation
+ * Written by Doug Mitchell 4/23/2003
+ */
+ 
+#include "bfContext.h"
+
+BlowfishContext::~BlowfishContext()
+{
+	deleteKey();
+}
+
+void BlowfishContext::deleteKey()
+{
+	memset(&mBfKey, 0, sizeof(mBfKey));
+	mInitFlag = false;
+}
+
+/* 
+ * Standard CSPContext init, called from CSPFullPluginSession::init().
+ * Reusable, e.g., query followed by en/decrypt.
+ */
+void BlowfishContext::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_BLOWFISH, 
+		encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
+		keyData, keyLen);
+	if((keyLen < BF_MIN_KEY_SIZE_BYTES) || (keyLen > BF_MAX_KEY_SIZE_BYTES)) {
+		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)) {
+		BF_set_key(&mBfKey, keyLen, keyData);
+	
+		/* save this raw key data */
+		memmove(mRawKey, keyData, keyLen); 
+		mRawKeySize = keyLen;
+	}
+	
+	/* Finally, have BlockCryptor do its setup */
+	setup(BF_BLOCK, context);
+	mInitFlag = true;
+}	
+
+/*
+ * Functions called by BlockCryptor
+ */
+void BlowfishContext::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 != BF_BLOCK) {
+		CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
+	}
+	if(cipherTextLen < BF_BLOCK) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+	BF_ecb_encrypt((const unsigned char *)plainText, (unsigned char *)cipherText,
+		&mBfKey, BF_ENCRYPT);
+	cipherTextLen = BF_BLOCK;
+}
+
+void BlowfishContext::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 < BF_BLOCK) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+	BF_ecb_encrypt((const unsigned char *)cipherText, (unsigned char *)plainText,
+		&mBfKey, BF_DECRYPT);
+	plainTextLen = BF_BLOCK;
+}