Fix key decryption calc for some situations#2
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According to ISO/DIS 32000-2, section 7.6.4.3.1 - "Algorithm 2: Computing a file encryption key in order to encrypt a document", the f) step tells to append ff ff ff ff into the md5 calculation when EncryptMetadata is false.
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According to ISO/DIS 32000-2, section 7.6.4.3.1 - "Algorithm 2: Computing a file encryption key in order to encrypt a document", the f) step tells to append ff ff ff ff into the md5 calculation when EncryptMetadata is false.