Security-55163.44.tar.gz

[apple/security.git] / libsecurity_apple_csp / lib / rc4Context.cpp

diff --git a/libsecurity_apple_csp/lib/rc4Context.cpp b/libsecurity_apple_csp/lib/rc4Context.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.
+ */
+
+
+/*
+ * rc4Context.cpp - glue between AppleCSPContext and ssleay RC4 implementation
+ * Written by Doug Mitchell 04/03/2001
+ */
+ 
+#include "rc4Context.h"
+
+RC4Context::~RC4Context()
+{
+    if (rc4Key != NULL) {
+        CCCryptorRelease(rc4Key);
+    }
+    rc4Key = NULL;
+}
+       
+/* 
+ * Standard CSPContext init, called from CSPFullPluginSession::init().
+ * Reusable, e.g., query followed by en/decrypt.
+ */
+void RC4Context::init( 
+       const Context &context, 
+       bool encrypting)
+{
+       CSSM_SIZE       keyLen;
+       uint8           *keyData        = NULL;
+       
+       /* obtain key from context */
+       symmetricKeyBits(context, session(), CSSM_ALGID_RC4, 
+               encrypting ? CSSM_KEYUSE_ENCRYPT : CSSM_KEYUSE_DECRYPT,
+               keyData, keyLen);
+       if((keyLen < kCCKeySizeMinRC4) || (keyLen > kCCKeySizeMaxRC4)) {
+               CssmError::throwMe(CSSMERR_CSP_INVALID_ATTR_KEY);
+       }
+       
+       /* All other context attributes ignored */
+       /* init the low-level state */
+    (void) CCCryptorCreateWithMode(0, kCCModeRC4, kCCAlgorithmRC4, ccDefaultPadding, NULL, keyData, keyLen, NULL, 0, 0, 0, &rc4Key);
+
+}      
+
+/*
+ * All of these functions are called by CSPFullPluginSession.
+ */
+void RC4Context::update(
+       void                    *inp, 
+       size_t                  &inSize,                        // in/out
+       void                    *outp, 
+       size_t                  &outSize)                       // in/out
+{
+    (void) CCCryptorUpdate(rc4Key, inp, inSize, outp, inSize, &outSize);
+}
+
+/* remainding functions are trivial for any stream cipher */
+void RC4Context::final(
+       CssmData                &out)   
+{
+       out.length(0);
+}
+
+size_t RC4Context::inputSize(
+       size_t                  outSize)                        // input for given output size
+{
+       return outSize;
+}
+
+size_t RC4Context::outputSize(
+       bool                    final /*= false*/, 
+       size_t                  inSize /*= 0*/)         // output for given input size
+{
+       return inSize;
+}
+
+void RC4Context::minimumProgress(
+       size_t                  &in, 
+       size_t                  &out)                           // minimum progress chunks
+{
+       in  = 1;
+       out = 1;
+}