Mercurial > hgrepos > Python2 > PyMuPDF

annotate mupdf-source/include/mupdf/pdf/crypt.h @ 43:202a1f38a622

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FIX: New added code snippets did not yet account for the changed return values from "_fromto()"
author Franz Glasner <fzglas.hg@dom66.de>
date Sat, 11 Oct 2025 17:15:08 +0200
parents b50eed0cc0ef
children
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1 // Copyright (C) 2004-2023 Artifex Software, Inc.
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2 //
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3 // This file is part of MuPDF.
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4 //
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5 // MuPDF is free software: you can redistribute it and/or modify it under the
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6 // terms of the GNU Affero General Public License as published by the Free
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7 // Software Foundation, either version 3 of the License, or (at your option)
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8 // any later version.
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9 //
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10 // MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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11 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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12 // FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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13 // details.
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14 //
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15 // You should have received a copy of the GNU Affero General Public License
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16 // along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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17 //
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18 // Alternative licensing terms are available from the licensor.
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19 // For commercial licensing, see <https://www.artifex.com/> or contact
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20 // Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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21 // CA 94129, USA, for further information.
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22
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23 #ifndef MUPDF_PDF_CRYPT_H
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24 #define MUPDF_PDF_CRYPT_H
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26 #include "mupdf/pdf/document.h"
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27 #include "mupdf/pdf/object.h"
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29 enum
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30 {
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31 PDF_ENCRYPT_KEEP,
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32 PDF_ENCRYPT_NONE,
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33 PDF_ENCRYPT_RC4_40,
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34 PDF_ENCRYPT_RC4_128,
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35 PDF_ENCRYPT_AES_128,
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36 PDF_ENCRYPT_AES_256,
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37 PDF_ENCRYPT_UNKNOWN
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38 };
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39
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40 /*
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41 Create crypt object for decrypting strings and streams
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42 given the Encryption and ID objects.
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43 */
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44 pdf_crypt *pdf_new_crypt(fz_context *ctx, pdf_obj *enc, pdf_obj *id);
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45 pdf_crypt *pdf_new_encrypt(fz_context *ctx, const char *opwd_utf8, const char *upwd_utf8, pdf_obj *id, int permissions, int algorithm);
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46 void pdf_drop_crypt(fz_context *ctx, pdf_crypt *crypt);
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47
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48 void pdf_crypt_obj(fz_context *ctx, pdf_crypt *crypt, pdf_obj *obj, int num, int gen);
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49 fz_stream *pdf_open_crypt(fz_context *ctx, fz_stream *chain, pdf_crypt *crypt, int num, int gen);
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50 fz_stream *pdf_open_crypt_with_filter(fz_context *ctx, fz_stream *chain, pdf_crypt *crypt, pdf_obj *name, int num, int gen);
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52 int pdf_crypt_version(fz_context *ctx, pdf_crypt *crypt);
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53 int pdf_crypt_revision(fz_context *ctx, pdf_crypt *crypt);
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54 const char *pdf_crypt_method(fz_context *ctx, pdf_crypt *crypt);
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55 const char *pdf_crypt_string_method(fz_context *ctx, pdf_crypt *crypt);
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56 const char *pdf_crypt_stream_method(fz_context *ctx, pdf_crypt *crypt);
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57 int pdf_crypt_length(fz_context *ctx, pdf_crypt *crypt);
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58 int pdf_crypt_permissions(fz_context *ctx, pdf_crypt *crypt);
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59 int pdf_crypt_encrypt_metadata(fz_context *ctx, pdf_crypt *crypt);
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60 unsigned char *pdf_crypt_owner_password(fz_context *ctx, pdf_crypt *crypt);
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61 unsigned char *pdf_crypt_user_password(fz_context *ctx, pdf_crypt *crypt);
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62 unsigned char *pdf_crypt_owner_encryption(fz_context *ctx, pdf_crypt *crypt);
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63 unsigned char *pdf_crypt_user_encryption(fz_context *ctx, pdf_crypt *crypt);
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64 unsigned char *pdf_crypt_permissions_encryption(fz_context *ctx, pdf_crypt *crypt);
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65 unsigned char *pdf_crypt_key(fz_context *ctx, pdf_crypt *crypt);
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66
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67 void pdf_print_crypt(fz_context *ctx, fz_output *out, pdf_crypt *crypt);
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68
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69 void pdf_write_digest(fz_context *ctx, fz_output *out, pdf_obj *byte_range, pdf_obj *field, size_t digest_offset, size_t digest_length, pdf_pkcs7_signer *signer);
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70
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71 /*
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72 User access permissions from PDF reference.
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73 */
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74 enum
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75 {
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76 PDF_PERM_PRINT = 1 << 2,
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77 PDF_PERM_MODIFY = 1 << 3,
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78 PDF_PERM_COPY = 1 << 4,
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79 PDF_PERM_ANNOTATE = 1 << 5,
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80 PDF_PERM_FORM = 1 << 8,
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81 PDF_PERM_ACCESSIBILITY = 1 << 9, /* deprecated in pdf 2.0 (this permission is always granted) */
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82 PDF_PERM_ASSEMBLE = 1 << 10,
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83 PDF_PERM_PRINT_HQ = 1 << 11,
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84 };
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85
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86 int pdf_document_permissions(fz_context *ctx, pdf_document *doc);
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87
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88 int pdf_signature_byte_range(fz_context *ctx, pdf_document *doc, pdf_obj *signature, fz_range *byte_range);
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89
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90 /*
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91 retrieve an fz_stream to read the bytes hashed for the signature
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92 */
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93 fz_stream *pdf_signature_hash_bytes(fz_context *ctx, pdf_document *doc, pdf_obj *signature);
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94
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95 int pdf_signature_incremental_change_since_signing(fz_context *ctx, pdf_document *doc, pdf_obj *signature);
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96 int pdf_incremental_change_since_signing_widget(fz_context *ctx, pdf_annot *widget);
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97
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98 /*
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99 Retrieve the contents of a signature as a counted allocated
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100 block that must be freed by the caller.
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101 */
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102 size_t pdf_signature_contents(fz_context *ctx, pdf_document *doc, pdf_obj *signature, char **contents);
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103
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104 void pdf_encrypt_data(fz_context *ctx, pdf_crypt *crypt, int num, int gen, void (*fmt_str_out)(fz_context *, void *, const unsigned char *, size_t), void *arg, const unsigned char *s, size_t n);
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105
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106 size_t pdf_encrypted_len(fz_context *ctx, pdf_crypt *crypt, int num, int gen, size_t len);
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107
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108 #endif