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Fix decryption of R=4, V=4 files with < 16-byte keys by 0-padding - undocumented but matches Acrobat behavior (issue #19484)

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Ross Johnson 2025-02-24 12:52:08 -06:00
parent fef706233d
commit 4f25d7f6cd
5 changed files with 26 additions and 1 deletions
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9
src/core/crypto.js
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@ -1787,7 +1787,14 @@ class CipherTransformFactory {
);
}
this.encryptionKey = encryptionKey;
if (algorithm === 4 && encryptionKey.length < 16) {
// Extend key to 16 byte minimum (undocumented),
// fixes issue19484_1.pdf and issue19484_2.pdf.
this.encryptionKey = new Uint8Array(16);
this.encryptionKey.set(encryptionKey);
} else {
this.encryptionKey = encryptionKey;
}
if (algorithm >= 4) {
const cf = dict.get("CF");