X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/72a12576750f52947eb043106ba5c12c0d07decf..b1ab9ed8d0e0f1c3b66d7daa8fd5564444c56195:/libsecurity_apple_csp/lib/rc5Context.cpp

diff --git a/libsecurity_apple_csp/lib/rc5Context.cpp b/libsecurity_apple_csp/lib/rc5Context.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.
+ */
+
+
+/*
+ * rc5Context.cpp - glue between BlockCrytpor and ssleay RC5 implementation
+ * Written by Doug Mitchell 04/03/2001
+ */
+ 
+#include <openssl/rc5.h>
+#include <misc/rc5_locl.h>
+#include "rc5Context.h"
+
+RC5Context::~RC5Context()
+{
+	memset(&rc5Key, 0, sizeof(RC5_32_KEY));
+}
+	
+/* 
+ * Standard CSPContext init, called from CSPFullPluginSession::init().
+ * Reusable, e.g., query followed by en/decrypt.
+ */
+void RC5Context::init( 
+	const Context &context, 
+	bool encrypting)
+{
+	CSSM_SIZE	keyLen;
+	uint8 		*keyData 	= NULL;
+	uint32		rounds = RC5_16_ROUNDS;
+	
+	/* obtain key from context */
+	symmetricKeyBits(context, session(), CSSM_ALGID_RC5, 
+		encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
+		keyData, keyLen);
+	if((keyLen < RC5_MIN_KEY_SIZE_BYTES) || (keyLen > RC5_MAX_KEY_SIZE_BYTES)) {
+		CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
+	}
+	
+	/* 
+	 * Optional rounds
+	 */
+	rounds = context.getInt(CSSM_ATTRIBUTE_ROUNDS);
+	if(rounds == 0) {
+		/* default */
+		rounds = RC5_16_ROUNDS;
+	}
+
+	/* init the low-level state */
+	RC5_32_set_key(&rc5Key, keyLen, keyData, rounds);
+
+	/* Finally, have BlockCryptor do its setup */
+	setup(RC5_BLOCK_SIZE_BYTES, context);
+}	
+
+/*
+ * Functions called by BlockCryptor
+ */
+void RC5Context::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 != RC5_BLOCK_SIZE_BYTES) {
+		CssmError::throwMe(CSSMERR_CSP_INPUT_LENGTH_ERROR);
+	}
+	if(cipherTextLen < RC5_BLOCK_SIZE_BYTES) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+	
+	/*
+	 * Low-level code operates on array of unsigned 32-bit integers 
+	 */
+	RC5_32_INT	d[2];
+	RC5_32_INT l;
+	const unsigned char *pt = (const unsigned char *)plainText;
+	c2l(pt, l); d[0]=l;
+	c2l(pt, l); d[1]=l;
+	RC5_32_encrypt(d, &rc5Key);
+	unsigned char *ct = (unsigned char *)cipherText;
+	l=d[0]; l2c(l, ct);
+	l=d[1]; l2c(l, ct);
+	cipherTextLen = RC5_BLOCK_SIZE_BYTES;
+}
+
+void RC5Context::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 < RC5_BLOCK_SIZE_BYTES) {
+		CssmError::throwMe(CSSMERR_CSP_OUTPUT_LENGTH_ERROR);
+	}
+	/*
+	 * Low-level code operates on array of unsigned 32-bit integers 
+	 */
+	RC5_32_INT	d[2];
+	RC5_32_INT l;
+	const unsigned char *ct = (const unsigned char *)cipherText;
+	c2l(ct, l); d[0]=l;
+	c2l(ct, l); d[1]=l;
+	RC5_32_decrypt(d, &rc5Key);
+	unsigned char *pt = (unsigned char *)plainText;
+	l=d[0]; l2c(l, pt);
+	l=d[1]; l2c(l, pt);
+	plainTextLen = RC5_BLOCK_SIZE_BYTES;
+}
+