blob: b07b7a4e480583ee6c130a0018eb4d77b25319f8 [file] [log] [blame]
/**
* @author: Jeff Thompson
* Derived from ContentObject.js by Meki Cheraoui.
* See COPYING for copyright and distribution information.
*/
#include "binary-xml-encoder.h"
#include "binary-xml-decoder.h"
#include "binary-xml-name.h"
#include "binary-xml-publisher-public-key-digest.h"
#include "binary-xml-data.h"
static ndn_Error encodeSignature(struct ndn_Signature *signature, struct ndn_BinaryXmlEncoder *encoder)
{
ndn_Error error;
if ((error = ndn_BinaryXmlEncoder_writeElementStartDTag(encoder, ndn_BinaryXml_DTag_Signature)))
return error;
// TODO: Check if digestAlgorithm is the same as the default, and skip it, otherwise encode it as UDATA.
if ((error = ndn_BinaryXmlEncoder_writeOptionalBlobDTagElement
(encoder, ndn_BinaryXml_DTag_Witness, signature->witness, signature->witnessLength)))
return error;
// Require a signature.
if ((error = ndn_BinaryXmlEncoder_writeBlobDTagElement
(encoder, ndn_BinaryXml_DTag_SignatureBits, signature->signature, signature->signatureLength)))
return error;
if ((error = ndn_BinaryXmlEncoder_writeElementClose(encoder)))
return error;
return NDN_ERROR_success;
}
static ndn_Error decodeSignature(struct ndn_Signature *signature, struct ndn_BinaryXmlDecoder *decoder)
{
ndn_Error error;
if ((error = ndn_BinaryXmlDecoder_readElementStartDTag(decoder, ndn_BinaryXml_DTag_Signature)))
return error;
/* TODO: digestAlgorithm as UDATA */ signature->digestAlgorithm = 0; signature->digestAlgorithmLength = 0;
if ((error = ndn_BinaryXmlDecoder_readOptionalBinaryDTagElement
(decoder, ndn_BinaryXml_DTag_Witness, 0, &signature->witness, &signature->witnessLength)))
return error;
// Require a signature.
if ((error = ndn_BinaryXmlDecoder_readBinaryDTagElement
(decoder, ndn_BinaryXml_DTag_SignatureBits, 0, &signature->signature, &signature->signatureLength)))
return error;
if ((error = ndn_BinaryXmlDecoder_readElementClose(decoder)))
return error;
return NDN_ERROR_success;
}
static ndn_Error encodeSignedInfo(struct ndn_Signature *signature, struct ndn_MetaInfo *metaInfo, struct ndn_BinaryXmlEncoder *encoder)
{
if (metaInfo->type < 0)
return NDN_ERROR_success;
ndn_Error error;
if ((error = ndn_BinaryXmlEncoder_writeElementStartDTag(encoder, ndn_BinaryXml_DTag_SignedInfo)))
return error;
// This will skip encoding if there is no publisherPublicKeyDigest.
if ((error = ndn_encodeBinaryXmlPublisherPublicKeyDigest(&signature->publisherPublicKeyDigest, encoder)))
return error;
if ((error = ndn_BinaryXmlEncoder_writeOptionalTimeMillisecondsDTagElement
(encoder, ndn_BinaryXml_DTag_Timestamp, metaInfo->timestampMilliseconds)))
return error;
if (!(metaInfo->type < 0 || metaInfo->type == ndn_ContentType_DATA)) {
// Not the default of DATA, so we need to encode the type.
unsigned char *typeBytes;
unsigned int typeBytesLength = 3;
if (metaInfo->type == ndn_ContentType_ENCR)
typeBytes = "\x10\xD0\x91";
else if (metaInfo->type == ndn_ContentType_GONE)
typeBytes = "\x18\xE3\x44";
else if (metaInfo->type == ndn_ContentType_KEY)
typeBytes = "\x28\x46\x3F";
else if (metaInfo->type == ndn_ContentType_LINK)
typeBytes = "\x2C\x83\x4A";
else if (metaInfo->type == ndn_ContentType_NACK)
typeBytes = "\x34\x00\x8A";
else
return NDN_ERROR_unrecognized_ndn_ContentType;
if ((error = ndn_BinaryXmlEncoder_writeBlobDTagElement
(encoder, ndn_BinaryXml_DTag_Type, typeBytes, typeBytesLength)))
return error;
}
if ((error = ndn_BinaryXmlEncoder_writeOptionalUnsignedDecimalIntDTagElement
(encoder, ndn_BinaryXml_DTag_FreshnessSeconds, metaInfo->freshnessSeconds)))
return error;
if ((error = ndn_BinaryXmlEncoder_writeOptionalBlobDTagElement
(encoder, ndn_BinaryXml_DTag_FinalBlockID, metaInfo->finalBlockID, metaInfo->finalBlockIDLength)))
return error;
// This will skip encoding if there is no key locator.
if ((error = ndn_encodeBinaryXmlKeyLocator(&signature->keyLocator, encoder)))
return error;
if ((error = ndn_BinaryXmlEncoder_writeElementClose(encoder)))
return error;
return NDN_ERROR_success;
}
static ndn_Error decodeSignedInfo(struct ndn_Signature *signature, struct ndn_MetaInfo *metaInfo, struct ndn_BinaryXmlDecoder *decoder)
{
ndn_Error error;
if ((error = ndn_BinaryXmlDecoder_readElementStartDTag(decoder, ndn_BinaryXml_DTag_SignedInfo)))
return error;
if ((error = ndn_decodeOptionalBinaryXmlPublisherPublicKeyDigest(&signature->publisherPublicKeyDigest, decoder)))
return error;
if (error= ndn_BinaryXmlDecoder_readOptionalTimeMillisecondsDTagElement
(decoder, ndn_BinaryXml_DTag_Timestamp, &metaInfo->timestampMilliseconds))
return error;
unsigned char *typeBytes;
unsigned int typeBytesLength;
if ((error = ndn_BinaryXmlDecoder_readOptionalBinaryDTagElement
(decoder, ndn_BinaryXml_DTag_Type, 0, &typeBytes, &typeBytesLength)))
return error;
if (typeBytesLength == 0)
// The default Type is DATA.
metaInfo->type = ndn_ContentType_DATA;
else if (typeBytesLength == 3) {
// All the recognized content types are 3 bytes.
if (ndn_memcmp(typeBytes, "\x0C\x04\xC0", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_DATA;
else if (ndn_memcmp(typeBytes, "\x10\xD0\x91", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_ENCR;
else if (ndn_memcmp(typeBytes, "\x18\xE3\x44", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_GONE;
else if (ndn_memcmp(typeBytes, "\x28\x46\x3F", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_KEY;
else if (ndn_memcmp(typeBytes, "\x2C\x83\x4A", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_LINK;
else if (ndn_memcmp(typeBytes, "\x34\x00\x8A", typeBytesLength) == 0)
metaInfo->type = ndn_ContentType_NACK;
else
return NDN_ERROR_unrecognized_ndn_ContentType;
}
else
return NDN_ERROR_unrecognized_ndn_ContentType;
if ((error = ndn_BinaryXmlDecoder_readOptionalUnsignedIntegerDTagElement
(decoder, ndn_BinaryXml_DTag_FreshnessSeconds, &metaInfo->freshnessSeconds)))
return error;
if ((error = ndn_BinaryXmlDecoder_readOptionalBinaryDTagElement
(decoder, ndn_BinaryXml_DTag_FinalBlockID, 0, &metaInfo->finalBlockID, &metaInfo->finalBlockIDLength)))
return error;
if ((error = ndn_decodeOptionalBinaryXmlKeyLocator(&signature->keyLocator, decoder)))
return error;
if ((error = ndn_BinaryXmlDecoder_readElementClose(decoder)))
return error;
return NDN_ERROR_success;
}
ndn_Error ndn_encodeBinaryXmlData
(struct ndn_Data *data, unsigned int *signedFieldsBeginOffset, unsigned int *signedFieldsEndOffset, struct ndn_BinaryXmlEncoder *encoder)
{
ndn_Error error;
if ((error = ndn_BinaryXmlEncoder_writeElementStartDTag(encoder, ndn_BinaryXml_DTag_ContentObject)))
return error;
if ((error = encodeSignature(&data->signature, encoder)))
return error;
*signedFieldsBeginOffset = encoder->offset;
if ((error = ndn_encodeBinaryXmlName(&data->name, encoder)))
return error;
if ((error = encodeSignedInfo(&data->signature, &data->metaInfo, encoder)))
return error;
if ((error = ndn_BinaryXmlEncoder_writeBlobDTagElement
(encoder, ndn_BinaryXml_DTag_Content, data->content, data->contentLength)))
return error;
*signedFieldsEndOffset = encoder->offset;
if ((error = ndn_BinaryXmlEncoder_writeElementClose(encoder)))
return error;
return NDN_ERROR_success;
}
ndn_Error ndn_decodeBinaryXmlData
(struct ndn_Data *data, unsigned int *signedFieldsBeginOffset, unsigned int *signedFieldsEndOffset, struct ndn_BinaryXmlDecoder *decoder)
{
ndn_Error error;
if ((error = ndn_BinaryXmlDecoder_readElementStartDTag(decoder, ndn_BinaryXml_DTag_ContentObject)))
return error;
int gotExpectedTag;
if ((error = ndn_BinaryXmlDecoder_peekDTag(decoder, ndn_BinaryXml_DTag_Signature, &gotExpectedTag)))
return error;
if (gotExpectedTag) {
if ((error = decodeSignature(&data->signature, decoder)))
return error;
}
else
ndn_Signature_initialize(&data->signature, data->signature.keyLocator.keyName.components, data->signature.keyLocator.keyName.maxComponents);
*signedFieldsBeginOffset = decoder->offset;
if ((error = ndn_decodeBinaryXmlName(&data->name, decoder)))
return error;
if ((error = ndn_BinaryXmlDecoder_peekDTag(decoder, ndn_BinaryXml_DTag_SignedInfo, &gotExpectedTag)))
return error;
if (gotExpectedTag) {
if ((error = decodeSignedInfo(&data->signature, &data->metaInfo, decoder)))
return error;
}
else
ndn_MetaInfo_initialize(&data->metaInfo);
// Require a Content element, but set allowNull to allow a missing BLOB.
if ((error = ndn_BinaryXmlDecoder_readBinaryDTagElement
(decoder, ndn_BinaryXml_DTag_Content, 1, &data->content, &data->contentLength)))
return error;
*signedFieldsEndOffset = decoder->offset;
if ((error = ndn_BinaryXmlDecoder_readElementClose(decoder)))
return error;
return NDN_ERROR_success;
}