Security-55163.44.tar.gz

[apple/security.git] / 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;
+}
+