File indexing completed on 2024-06-23 05:19:21

 /*
     SPDX-FileCopyrightText: 2015 Sandro Knauß <knauss@kolabsys.com>
     SPDX-FileCopyrightText: 2001,2002 the KPGP authors
     See file AUTHORS.kpgp for details
 
     SPDX-License-Identifier: GPL-2.0-or-later
  */
 
 #include "cryptohelper.h"
 
 using namespace MimeTreeParser;
 
 PGPBlockType Block::determineType() const
 {
     const QByteArray data = text();
     if (data.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
         return NoPgpBlock;
     } else if (data.startsWith("-----BEGIN PGP SIGNED")) {
         return ClearsignedBlock;
     } else if (data.startsWith("-----BEGIN PGP SIGNATURE")) {
         return SignatureBlock;
     } else if (data.startsWith("-----BEGIN PGP PUBLIC")) {
         return PublicKeyBlock;
     } else if (data.startsWith("-----BEGIN PGP PRIVATE") || data.startsWith("-----BEGIN PGP SECRET")) {
         return PrivateKeyBlock;
     } else if (data.startsWith("-----BEGIN PGP MESSAGE")) {
         if (data.startsWith("-----BEGIN PGP MESSAGE PART")) {
             return MultiPgpMessageBlock;
         } else {
             return PgpMessageBlock;
         }
     } else if (data.startsWith("-----BEGIN PGP ARMORED FILE")) {
         return PgpMessageBlock;
     } else if (data.startsWith("-----BEGIN PGP ")) {
         return UnknownBlock;
     } else {
         return NoPgpBlock;
     }
 }
 
 QList<Block> MimeTreeParser::prepareMessageForDecryption(const QByteArray &msg)
 {
     PGPBlockType pgpBlock = NoPgpBlock;
     QList<Block> blocks;
     int start = -1; // start of the current PGP block
     int lastEnd = -1; // end of the last PGP block
     const int length = msg.length();
 
     if (msg.isEmpty()) {
         return blocks;
     }
     if (msg.startsWith("-----BEGIN PGP PUBLIC KEY BLOCK-----")) {
         return blocks;
     }
 
     if (msg.startsWith("-----BEGIN PGP ")) {
         start = 0;
     } else {
         start = msg.indexOf("\n-----BEGIN PGP ") + 1;
         if (start == 0) {
             blocks.append(Block(msg, NoPgpBlock));
             return blocks;
         }
     }
 
     while (start != -1) {
         int nextEnd;
         int nextStart;
 
         // is the PGP block a clearsigned block?
         if (!strncmp(msg.constData() + start + 15, "SIGNED", 6)) {
             pgpBlock = ClearsignedBlock;
         } else {
             pgpBlock = UnknownBlock;
         }
 
         nextEnd = msg.indexOf("\n-----END PGP ", start + 15);
         nextStart = msg.indexOf("\n-----BEGIN PGP ", start + 15);
 
         if (nextEnd == -1) { // Missing END PGP line
             if (lastEnd != -1) {
                 blocks.append(Block(msg.mid(lastEnd + 1), UnknownBlock));
             } else {
                 blocks.append(Block(msg.mid(start), UnknownBlock));
             }
             break;
         }
 
         if ((nextStart == -1) || (nextEnd < nextStart) || (pgpBlock == ClearsignedBlock)) {
             // most likely we found a PGP block (but we don't check if it's valid)
 
             // store the preceding non-PGP block
             if (start - lastEnd - 1 > 0) {
                 blocks.append(Block(msg.mid(lastEnd + 1, start - lastEnd - 1), NoPgpBlock));
             }
 
             lastEnd = msg.indexOf("\n", nextEnd + 14);
             if (lastEnd == -1) {
                 if (start < length) {
                     blocks.append(Block(msg.mid(start)));
                 }
                 break;
             } else {
                 blocks.append(Block(msg.mid(start, lastEnd + 1 - start)));
                 if ((nextStart != -1) && (nextEnd > nextStart)) {
                     nextStart = msg.indexOf("\n-----BEGIN PGP ", lastEnd + 1);
                 }
             }
         }
 
         start = nextStart;
 
         if (start == -1) {
             if (lastEnd + 1 < length) {
                 // rest of mail is no PGP Block
                 blocks.append(Block(msg.mid(lastEnd + 1), NoPgpBlock));
             }
             break;
         } else {
             start++; // move start behind the '\n'
         }
     }
 
     return blocks;
 }
 
 Block::Block() = default;
 
 Block::Block(const QByteArray &m)
     : msg(m)
 {
     mType = determineType();
 }
 
 Block::Block(const QByteArray &m, PGPBlockType t)
     : msg(m)
     , mType(t)
 {
 }
 
 QByteArray MimeTreeParser::Block::text() const
 {
     return msg;
 }
 
 PGPBlockType Block::type() const
 {
     return mType;
 }