X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/72a12576750f52947eb043106ba5c12c0d07decf..b1ab9ed8d0e0f1c3b66d7daa8fd5564444c56195:/libsecurity_ssl/lib/symCipher.c

diff --git a/libsecurity_ssl/lib/symCipher.c 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;
+}
+