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M1: a V4 RC4 file with a 40- or 48-bit key reads and saves (#6397) (#6398)

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mtlcl410 authored and GitHub committed 2026-11-09 08:48:43 +08:00
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parity/acrobat-features.toml
+2 -2
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@@ -226,8 +226,8 @@ milestone = "M1"
status = "shipped"
commands = []
tools = []
evidence = ["crates/crypt/src/tests.rs::identity_crypt_filters_leave_data_alone", "crates/cos/tests/it/encryption.rs::a_crypt_filter_selected_by_reference_is_used", "crates/cos/tests/it/encryption.rs::an_identity_crypt_filter_selected_by_reference_leaves_a_stream_alone", "crates/render/src/raster/tests.rs::a_stream_with_a_crypt_filter_of_its_own_is_drawn"]
notes = "a stream can name its own filter (/Crypt in /Filter, its name in /DecodeParms), read and written, each part given directly or by reference, in cos and in the renderer; /StmF, /StrF, /EFF and /CFM by reference too. A /Filter given by reference selects the crypt filter, but Stream::decoded still refuses it, so such a stream is decrypted and not decoded outside the renderer."
evidence = ["crates/crypt/src/tests.rs::identity_crypt_filters_leave_data_alone", "crates/cos/tests/it/encryption.rs::a_crypt_filter_selected_by_reference_is_used", "crates/cos/tests/it/encryption.rs::an_identity_crypt_filter_selected_by_reference_leaves_a_stream_alone", "crates/render/src/raster/tests.rs::a_stream_with_a_crypt_filter_of_its_own_is_drawn", "crates/crypt/src/tests.rs::a_v4_rc4_key_shorter_than_16_bytes_is_extended_with_zeros"]
notes = "a stream can name its own filter (/Crypt in /Filter, its name in /DecodeParms), read and written, each part given directly or by reference, in cos and in the renderer; /StmF, /StrF, /EFF and /CFM by reference too. A /Filter given by reference selects the crypt filter, but Stream::decoded still refuses it, so such a stream is decrypted and not decoded outside the renderer. A /V 4 RC4 filter with a 40- or 48-bit key reads as Acrobat writes it, the key extended to 16 bytes with zeros before Algorithm 1, in cos as in the renderer (pdf.js issue 19484)."
[[feature]]
id = "core.attachment-only-encryption"