X-Git-Url: https://git.saurik.com/apple/security.git/blobdiff_plain/80e2389990082500d76eb566d4946be3e786c3ef..d8f41ccd20de16f8ebe2ccc84d47bf1cb2b26bbb:/Security/libsecurity_cryptkit/lib/feeCipherFile.c?ds=sidebyside

diff --git a/Security/libsecurity_cryptkit/lib/feeCipherFile.c b/Security/libsecurity_cryptkit/lib/feeCipherFile.c
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+/* Copyright (c) 1998,2011,2014 Apple Inc.  All Rights Reserved.
+ *
+ * NOTICE: USE OF THE MATERIALS ACCOMPANYING THIS NOTICE IS SUBJECT
+ * TO THE TERMS OF THE SIGNED "FAST ELLIPTIC ENCRYPTION (FEE) REFERENCE
+ * SOURCE CODE EVALUATION AGREEMENT" BETWEEN APPLE, INC. AND THE
+ * ORIGINAL LICENSEE THAT OBTAINED THESE MATERIALS FROM APPLE,
+ * INC.  ANY USE OF THESE MATERIALS NOT PERMITTED BY SUCH AGREEMENT WILL
+ * EXPOSE YOU TO LIABILITY.
+ ***************************************************************************
+ *
+ * feeCipherFile.c - general cipherfile support
+ *
+ * Revision History
+ * ----------------
+ * 05 Feb 97 at Apple
+ *	Added CFE_FEED and CFE_FEEDExp types.
+ * 24 Oct 96 at NeXT
+ *	Created.
+ */
+
+#include "feeCipherFile.h"
+#include "falloc.h"
+#include "feeFEEDExp.h"
+#include "feeFEED.h"
+#include "feeDebug.h"
+#include "CipherFileFEED.h"
+#include "CipherFileDES.h"
+
+
+/*
+ * Create a cipherfile of specified cipherFileEncrType.
+ */
+feeReturn createCipherFile(feePubKey sendPrivKey,
+	feePubKey recvPubKey,
+	cipherFileEncrType encrType,
+	const unsigned char *plainText,
+	unsigned plainTextLen,
+	int genSig,				// 1 ==> generate signature
+	int doEnc64,				// 1 ==> perform enc64
+	unsigned userData,			// for caller's convenience
+	unsigned char **cipherFileData,		// RETURNED
+	unsigned *cipherFileDataLen)		// RETURNED
+{
+	feeReturn 		frtn = FR_Success;
+	feeCipherFile		cipherFile = NULL;
+	unsigned char 		*cipherData = NULL;
+	unsigned 		cipherDataLen;
+
+	/*
+	 * Dispatch to encrType-specific code.
+	 */
+	switch(encrType) {
+	    case CFE_RandDES:
+	    	frtn = createRandDES(sendPrivKey,
+			recvPubKey,
+			plainText,
+			plainTextLen,
+			genSig,
+			userData,
+			&cipherFile);
+		break;
+	    case CFE_PublicDES:
+	    	frtn = createPubDES(sendPrivKey,
+			recvPubKey,
+			plainText,
+			plainTextLen,
+			genSig,
+			userData,
+			&cipherFile);
+		break;
+	    case CFE_FEED:
+	    	frtn = createFEED(sendPrivKey,
+			recvPubKey,
+			plainText,
+			plainTextLen,
+			genSig,
+			userData,
+			&cipherFile);
+		break;
+	    case CFE_FEEDExp:
+	    	frtn = createFEEDExp(sendPrivKey,
+			recvPubKey,
+			plainText,
+			plainTextLen,
+			genSig,
+			userData,
+			&cipherFile);
+		break;
+	    default:
+	    	frtn = FR_Unimplemented;
+		break;
+	}
+
+	if(frtn) {
+		goto out;
+	}
+
+	/*
+	 * Common logic for all encrTypes
+	 */
+
+	/*
+	 * Get the cipherfile's raw data
+	 */
+	frtn = feeCFileDataRepresentation(cipherFile,
+		(const unsigned char **)&cipherData,
+		&cipherDataLen);
+	if(frtn) {
+		goto out;
+	}
+
+	/*
+	 * Optionally encode in 64-char ASCII
+	 */
+	if(doEnc64) {
+		*cipherFileData = enc64(cipherData,
+			cipherDataLen,
+			cipherFileDataLen);
+		ffree(cipherData);
+		if(*cipherFileData == NULL) {
+			frtn = FR_Internal;
+			ffree(cipherData);
+			goto out;
+		}
+	}
+	else {
+		*cipherFileData = cipherData;
+		*cipherFileDataLen = cipherDataLen;
+	}
+out:
+	/* free stuff */
+	if(cipherFile) {
+		feeCFileFree(cipherFile);
+	}
+	return frtn;
+}
+
+/*
+ * Parse a cipherfile.
+ *
+ * sendPubKey only needed for cipherFileEncrType CFE_RandDES if signature
+ * is present. If sendPubKey is present, it will be used for signature
+ * validation rather than the embedded sender's public key.
+ */
+feeReturn parseCipherFile(feePubKey recvPrivKey,
+	feePubKey sendPubKey,
+	const unsigned char *cipherFileData,
+	unsigned cipherFileDataLen,
+	int doDec64,					// 1 ==> perform dec64
+	cipherFileEncrType *encrType,	// RETURNED
+	unsigned char **plainText,		// RETURNED
+	unsigned *plainTextLen,			// RETURNED
+	feeSigStatus *sigStatus,		// RETURNED
+	unsigned *userData)				// RETURNED
+{
+	feeReturn 		frtn;
+	unsigned char		*cipherData = NULL;
+	unsigned		cipherDataLen;
+	int			freeCipherData = 0;
+	feeCipherFile		cipherFile = NULL;
+
+	*plainText = NULL;
+	*plainTextLen = 0;
+
+	if(recvPrivKey == NULL) {	// always required
+		frtn = FR_BadPubKey;
+		goto out;
+	}
+
+	/*
+	 * First, optional dec64()
+	 */
+	if(doDec64) {
+		cipherData = dec64(cipherFileData,
+			cipherFileDataLen,
+			&cipherDataLen);
+		if(cipherData == NULL) {
+			frtn = FR_BadEnc64;
+			goto out;
+		}
+		else {
+			freeCipherData = 1;
+		}
+	}
+	else {
+		cipherData = (unsigned char *)cipherFileData;
+		cipherDataLen = cipherFileDataLen;
+	}
+
+	/*
+	 * Cons up a feeCipherFile object.
+	 */
+	frtn = feeCFileNewFromDataRep(cipherData,
+		cipherDataLen,
+		&cipherFile);
+	if(frtn) {
+		goto out;
+	}
+	*encrType = feeCFileEncrType(cipherFile);
+	*userData = feeCFileUserData(cipherFile);
+	frtn = decryptCipherFile(cipherFile,
+		recvPrivKey,
+		sendPubKey,
+		plainText,
+		plainTextLen,
+		sigStatus);
+
+out:
+	/* free stuff */
+
+	if(cipherData && freeCipherData) {
+		ffree(cipherData);
+	}
+	if(cipherFile) {
+		feeCFileFree(cipherFile);
+	}
+	return frtn;
+}
+
+/*
+ * Decrypt a feeCipherFile obtained via feeCFileNewFromDataRep().
+ * recvPrivKey is required in all cases. If sendPubKey is present,
+ * sendPubKey - rather than the embedded sender's public key - will be
+ * used for signature validation.
+ */
+feeReturn decryptCipherFile(feeCipherFile cipherFile,
+	feePubKey recvPrivKey,			// required
+	feePubKey sendPubKey,			// optional, for signature
+	unsigned char **plainText,		// malloc'd & RETURNED
+	unsigned *plainTextLen,			// RETURNED
+	feeSigStatus *sigStatus)		// RETURNED
+{
+	cipherFileEncrType 	encrType = feeCFileEncrType(cipherFile);
+	feeReturn 		frtn;
+
+	*plainText = NULL;
+	*plainTextLen = 0;
+
+	/*
+	 * Dispatch to encrType-specific code.
+	 */
+	switch(encrType) {
+	    case CFE_RandDES:
+	    	frtn = decryptRandDES(cipherFile,
+			recvPrivKey,
+			sendPubKey,
+			plainText,
+			plainTextLen,
+			sigStatus);
+		break;
+	    case CFE_PublicDES:
+	    	frtn = decryptPubDES(cipherFile,
+			recvPrivKey,
+			sendPubKey,
+			plainText,
+			plainTextLen,
+			sigStatus);
+		break;
+	    case CFE_FEED:
+	    	frtn = decryptFEED(cipherFile,
+			recvPrivKey,
+			sendPubKey,
+			plainText,
+			plainTextLen,
+			sigStatus);
+		break;
+	    case CFE_FEEDExp:
+	    	frtn = decryptFEEDExp(cipherFile,
+			recvPrivKey,
+			sendPubKey,
+			plainText,
+			plainTextLen,
+			sigStatus);
+		break;
+	    default:
+	    	frtn = FR_Unimplemented;
+		break;
+	}
+	return frtn;
+}