108 lines
4.4 KiB
C
108 lines
4.4 KiB
C
// Copyright (C) 2004-2021 Artifex Software, Inc.
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//
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// This file is part of MuPDF.
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//
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// MuPDF is free software: you can redistribute it and/or modify it under the
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// terms of the GNU Affero General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
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// details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
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//
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// Alternative licensing terms are available from the licensor.
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// For commercial licensing, see <https://www.artifex.com/> or contact
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// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
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// CA 94129, USA, for further information.
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#ifndef MUPDF_PDF_CRYPT_H
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#define MUPDF_PDF_CRYPT_H
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#include "mupdf/pdf/document.h"
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#include "mupdf/pdf/object.h"
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enum
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{
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PDF_ENCRYPT_KEEP,
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PDF_ENCRYPT_NONE,
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PDF_ENCRYPT_RC4_40,
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PDF_ENCRYPT_RC4_128,
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PDF_ENCRYPT_AES_128,
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PDF_ENCRYPT_AES_256,
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PDF_ENCRYPT_UNKNOWN
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};
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/*
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Create crypt object for decrypting strings and streams
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given the Encryption and ID objects.
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*/
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pdf_crypt *pdf_new_crypt(fz_context *ctx, pdf_obj *enc, pdf_obj *id);
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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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void pdf_drop_crypt(fz_context *ctx, pdf_crypt *crypt);
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void pdf_crypt_obj(fz_context *ctx, pdf_crypt *crypt, pdf_obj *obj, int num, int gen);
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fz_stream *pdf_open_crypt(fz_context *ctx, fz_stream *chain, pdf_crypt *crypt, int num, int gen);
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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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int pdf_crypt_version(fz_context *ctx, pdf_crypt *crypt);
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int pdf_crypt_revision(fz_context *ctx, pdf_crypt *crypt);
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const char *pdf_crypt_method(fz_context *ctx, pdf_crypt *crypt);
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const char *pdf_crypt_string_method(fz_context *ctx, pdf_crypt *crypt);
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const char *pdf_crypt_stream_method(fz_context *ctx, pdf_crypt *crypt);
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int pdf_crypt_length(fz_context *ctx, pdf_crypt *crypt);
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int pdf_crypt_permissions(fz_context *ctx, pdf_crypt *crypt);
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int pdf_crypt_encrypt_metadata(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_owner_password(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_user_password(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_owner_encryption(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_user_encryption(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_permissions_encryption(fz_context *ctx, pdf_crypt *crypt);
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unsigned char *pdf_crypt_key(fz_context *ctx, pdf_crypt *crypt);
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void pdf_print_crypt(fz_context *ctx, fz_output *out, pdf_crypt *crypt);
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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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/*
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User access permissions from PDF reference.
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*/
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enum
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{
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PDF_PERM_PRINT = 1 << 2,
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PDF_PERM_MODIFY = 1 << 3,
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PDF_PERM_COPY = 1 << 4,
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PDF_PERM_ANNOTATE = 1 << 5,
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PDF_PERM_FORM = 1 << 8,
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PDF_PERM_ACCESSIBILITY = 1 << 9, /* deprecated in pdf 2.0 (this permission is always granted) */
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PDF_PERM_ASSEMBLE = 1 << 10,
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PDF_PERM_PRINT_HQ = 1 << 11,
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};
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int pdf_document_permissions(fz_context *ctx, pdf_document *doc);
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int pdf_signature_byte_range(fz_context *ctx, pdf_document *doc, pdf_obj *signature, fz_range *byte_range);
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/*
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retrieve an fz_stream to read the bytes hashed for the signature
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*/
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fz_stream *pdf_signature_hash_bytes(fz_context *ctx, pdf_document *doc, pdf_obj *signature);
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int pdf_signature_incremental_change_since_signing(fz_context *ctx, pdf_document *doc, pdf_obj *signature);
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/*
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Retrieve the contents of a signature as a counted allocated
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block that must be freed by the caller.
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*/
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size_t pdf_signature_contents(fz_context *ctx, pdf_document *doc, pdf_obj *signature, char **contents);
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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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size_t pdf_encrypted_len(fz_context *ctx, pdf_crypt *crypt, int num, int gen, size_t len);
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#endif
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