+++ /dev/null
-/*
- * 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.
- */
-
-
-/*
- * cdsaUtils.cpp - utility functions for CDSA-related code
- */
-
-#include "cdsaUtils.h"
-#include <Security/cssmerr.h>
-
-#ifdef NDEBUG
-
-#include <Security/globalizer.h>
-
-/* silent cerr substitute */
-ModuleNexus<Asn1ErrorClass> AsnNullError;
-#endif /* NDEBUG */
-
-/* malloc/copy AsnBits.bits -->CssmOwnedData */
-void SC_asnBitsToCssmData(
- const AsnBits &bits,
- CssmOwnedData &oData)
-{
- size_t len = (bits.BitLen() + 7) / 8;
- oData.copy(reinterpret_cast<const uint8 *>(bits.BitOcts()), len);
-}
-
-/* given DER-encoded bit string, decoded it and malloc/copy results
- * back to a CssmOwnedData */
-void SC_decodeAsnBitsToCssmData(
- const CssmData encodedBits,
- CssmOwnedData &oData)
-{
- AsnBits decodedBits;
- SC_decodeAsnObj(encodedBits, decodedBits);
- size_t len = (decodedBits.BitLen() + 7) / 8;
- oData.copy(reinterpret_cast<const uint8 *>(decodedBits.BitOcts()), len);
-}
-
-/*
- * Universal BDecPdu/BEncPdu replacements, used below in SC_decodeAsnObj and
- * SC_encodeAsnObj.
- *
- * All AsnType subclasses implement this either via PDU_MEMBER_MACROS
- * for SecuritySNACCRuntime built-in types, or explicitly for all
- * other classes using asn-useful.h. To faciliate a global "one
- * routine for encode/decode" which operates on AsnType &'s, we have
- * to explicitly provide this here. Why this is not in AsnType, I don't
- * know.
- */
-static int SC_BDecPDU(
- AsnType &asnObj,
- BUF_TYPE b,
- AsnLen &bytesDecoded)
-{
- ENV_TYPE env;
-
- bytesDecoded = 0;
- try {
- asnObj.BDec(b, bytesDecoded, env);
- return !b.ReadError();
- }
- catch(...) {
- return false;
- }
-}
-
-static int SC_BEncPdu(
- AsnType &asnObj,
- BUF_TYPE b,
- AsnLen &bytesEncoded)
-{
- bytesEncoded = asnObj.BEnc(b);
- return !b.WriteError();
-}
-
-/* DER-decode any AsnType object */
-void SC_decodeAsnObj(
- const CssmData &derEncoded,
- AsnType &asnObj)
-{
- AsnBuf buf;
- size_t len = (size_t)derEncoded.length();
-
- buf.InstallData(reinterpret_cast<char *>(derEncoded.data()), len);
- if(!SC_BDecPDU(asnObj, buf, len)) {
- CssmError::throwMe(CSSMERR_CL_UNKNOWN_FORMAT);
- }
-}
-
-/*
- * DER-encode any AsnType object.
- * Unfortunately the call has to give an estimate of the max encoded size of
- * the result. There is no way (that I know of) to figure this out at encode
- * time. If this turns out to be a problem we might have to do a retry,
- * doubling the size of the encoded buffer. Be liberal; the maxEncodedSize
- * buffer is only temporary - due to snacc encoding style, a copy out is
- * necessary in any case, so the mallocd size of encodedBuf is exactly the
- * right size.
- */
-void SC_encodeAsnObj(
- AsnType &asnObj,
- CssmOwnedData &derEncoded,
- size_t maxEncodedSize)
-{
- CssmAutoData aData(derEncoded.allocator); // temp encode target
- aData.malloc(maxEncodedSize);
- memset(aData.data(), 0, maxEncodedSize);
- AsnBuf encBuf;
- encBuf.Init(static_cast<char *>(aData.data()), maxEncodedSize);
- encBuf.ResetInWriteRvsMode();
- AsnLen encoded;
- int rtn = SC_BEncPdu(asnObj, encBuf, encoded);
- if(encoded > maxEncodedSize) {
- CssmError::throwMe(CSSMERR_CSSM_BUFFER_TOO_SMALL);
- }
- if(!rtn) {
- /* not sure how this can happen... */
- CssmError::throwMe(CSSMERR_CSSM_BUFFER_TOO_SMALL);
- }
- /* success; copy out to caller */
- derEncoded.get().clear();
- derEncoded.copy(encBuf.DataPtr(), encBuf.DataLen());
-}
-
-/*
- * Given a contentLength, obtain the length of the DER length encoding.
- */
-size_t SC_lengthOfLength(
- size_t contentLen)
-{
- if(contentLen < 128) {
- return 1;
- }
- else if(contentLen < 256) {
- return 2;
- }
- else if(contentLen < 65536) {
- return 3;
- }
- else if(contentLen < 16777126) {
- return 4;
- }
- else {
- return 5;
- }
-}
-
-/*
- * Encode a DER length field. Pass in the lengthOfLength if you've obtained
- * it in a previous call to SC_lengthOfLength.
- */
-void SC_encodeLength(
- size_t contentLen,
- void *cp,
- size_t lengthOfLength)
-{
- if(lengthOfLength == 0) {
- lengthOfLength = SC_lengthOfLength(contentLen);
- }
- unsigned char *ucp = reinterpret_cast<unsigned char *>(cp);
- if(lengthOfLength == 1) {
- /* easy case */
- *ucp = contentLen;
- return;
- }
- lengthOfLength--;
- *ucp = (0x80 + lengthOfLength);
- ucp += lengthOfLength;
- for(size_t i=0; i<lengthOfLength; i++) {
- *ucp-- = contentLen & 0xff;
- contentLen >>= 8;
- }
-}
-
-/*
- * Explicitly non-inlined SnaccError throw
- */
-void SnaccExcep::throwMe(int err)
-{
- throw SnaccExcep(err);
-}
projects / apple / security.git / blobdiff