Security-55163.44.tar.gz

[apple/security.git] / libsecurity_ssl / lib / symCipher.c

diff --git a/libsecurity_ssl/lib/symCipher.c b/libsecurity_ssl/lib/symCipher.c
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+++ b/libsecurity_ssl/lib/symCipher.c
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+/*
+ * Copyright (c) 1999-2001,2005-2008,2010-2012 Apple Inc. All Rights Reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The 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.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+/*
+ * symCipher.c - CDSA-based symmetric cipher module
+ */
+
+#include "sslContext.h"
+#include "cryptType.h"
+#include "sslDebug.h"
+#include "sslMemory.h"
+#include <CommonCrypto/CommonCryptor.h>
+#include "symCipher.h"
+
+/*
+ * CommonCrypto-based symmetric cipher callouts
+ */
+OSStatus CCSymmInit(
+       uint8_t *key,
+       uint8_t* iv,
+       CipherContext *cipherCtx,
+       SSLContext *ctx)
+{
+       /*
+        * Cook up a CCCryptorRef. Assumes:
+        *              cipherCtx->symCipher.keyAlg
+        *              cipherCtx->encrypting
+        *              key (raw key bytes)
+        *              iv (raw bytes)
+        * On successful exit:
+        *              Resulting CCCryptorRef --> cipherCtx->cryptorRef
+        */
+       CCCryptorStatus ccrtn;
+       CCOperation op = cipherCtx->encrypting ? kCCEncrypt : kCCDecrypt;
+
+       if(cipherCtx->cryptorRef) {
+               CCCryptorRelease(cipherCtx->cryptorRef);
+               cipherCtx->cryptorRef = NULL;
+       }
+
+       ccrtn = CCCryptorCreate(op, cipherCtx->symCipher->keyAlg,
+               0,              /* options - no padding, default CBC */
+               key, cipherCtx->symCipher->keySize,
+               iv,
+               &cipherCtx->cryptorRef);
+       if(ccrtn) {
+               sslErrorLog("CCCryptorCreate returned %d\n", (int)ccrtn);
+               return internalComponentErr;
+       }
+       return noErr;
+}
+
+/* same for en/decrypt */
+OSStatus CCSymmEncryptDecrypt(
+       const uint8_t *src,
+       uint8_t *dest,
+       size_t len,
+       CipherContext *cipherCtx,
+       SSLContext *ctx)
+{
+       CCCryptorStatus ccrtn;
+
+       ASSERT(cipherCtx != NULL);
+       ASSERT(cipherCtx->cryptorRef != NULL);
+       if(cipherCtx->cryptorRef == NULL) {
+               sslErrorLog("CCSymmEncryptDecrypt: NULL cryptorRef\n");
+               return internalComponentErr;
+       }
+    size_t data_moved;
+       ccrtn = CCCryptorUpdate(cipherCtx->cryptorRef, src, len,
+               dest, len, &data_moved);
+    assert(data_moved == len);
+       #if SSL_DEBUG
+       if(ccrtn) {
+               sslErrorLog("CCSymmEncryptDecrypt: returned %d\n", (int)ccrtn);
+               return internalComponentErr;
+       }
+       #endif
+       return noErr;
+}
+
+OSStatus CCSymmFinish(
+       CipherContext *cipherCtx,
+       SSLContext *ctx)
+{
+       if(cipherCtx->cryptorRef) {
+               CCCryptorRelease(cipherCtx->cryptorRef);
+               cipherCtx->cryptorRef = NULL;
+       }
+       return noErr;
+}
+