Crate office_crypto

Pure Rust library to decrypt password-protected MS Office files.

Example

This crate exposes two functions: decrypt_from_file and decrypt_from_bytes, which do exactly what they say they do. The resulting bytes can then be interpreted by any MS Office parser like docx or calamine.

use docx::DocxFile;
use office_crypto::decrypt_from_file;
use std::io::Cursor;

let path = "protected.docx";
let decrypted: Vec<u8> = decrypt_from_file(path, "Password1234_").unwrap();

let docx = DocxFile::from_reader(Cursor::new(decrypted)).unwrap();
let docx = docx.parse().unwrap();

// Now we can access the docx content

Formats

• ECMA-376 (Agile Encryption/Standard Encryption)
  • MS-DOCX (OOXML) (Word 2007-Present)
  • MS-XLSX (OOXML) (Excel 2007-Present)
  • MS-PPTX (OOXML) (PowerPoint 2007-Present)
• Office Binary Document RC4 CryptoAPI
  • MS-DOC (Word 2002, 2003, 2004)
  • MS-XLS (Excel 2002, 2003, 2004)
  • MS-PPT (PowerPoint 2002, 2003, 2004)
• ECMA-376 (Extensible Encryption)

Agile encrypted files that use non-SHA512 hash functions will yield DecryptError::Unimplemented, though I haven’t yet encountered such a file.

Note that the latest version of Word will create an Agile encrypted document.

Enums

DecryptError

Functions

decrypt_from_bytes

Decrypt bytes as an MS Office file, returning the decrypted bytes.

decrypt_from_file

Open and decrypt an MS Office file, returning the decrypted bytes.