{"record":{"id":"b9b37610c06413ea","repo":"moonD4rk/HackBrowserData","slug":"decrypt-w","errorCode":null,"errorMessage":"decrypt: %w","messagePattern":"decrypt: %w","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"crypto/crypto.go","lineNumber":168,"sourceCode":"dst := make([]byte, len(ciphertext))\ncipher.NewCBCDecrypter(block, iv).CryptBlocks(dst, ciphertext)\n\ndst, err := pkcs5UnPadding(dst, bs)\nif err != nil {\n\treturn nil, fmt.Errorf(\"decrypt: %w\", err)\n}\nreturn dst, nil","sourceCodeStart":150,"sourceCodeEnd":186,"githubUrl":"https://github.com/moonD4rk/HackBrowserData/blob/0503d04d7a8d0379d060268a74f1b149e5a0aad5/crypto/crypto.go#L150-L186","documentation":"At this throw site the error means CBC decryption completed but PKCS#5 un-padding of the decrypted plaintext failed: the final block's last byte was not a valid padding length (zero, greater than the block size, or the padding bytes did not all match that length). cbcDecrypt itself is a generic helper guarding decrypted output, so the faulting input is the plaintext produced by AES-CBC or 3DES-CBC decryption — almost always the result of a wrong key or IV rather than a malformed buffer. It fires whenever the caller passes a cipher key that does not match the one used to encrypt, an incorrect IV, or a corrupted/truncated-then-repadded ciphertext.","triggerScenarios":"Wrong or mis-derived decryption key (e.g. wrong DPAPI-decrypted key, wrong passcode for 3DES); incorrect IV (wrong 'salt'/nonce source); ciphertext corrupted, truncated then re-blocked, or encrypted with a different scheme (GCM/zero-padding) than PKCS#5.","commonSituations":"Decrypting browser cookies/passwords with a key fetched for a different browser profile or version; Chrome v80+ key migration mismatches; hand-crafted test ciphertext without PKCS#5 padding; reusing an IV blob from another record.","solutions":["Confirm the decryption key is the exact one used at encryption time (re-derive profile keys, re-decrypt OS-level key stores).","Verify the IV matches the one used for encryption and has the same length as the cipher block size.","Ensure the ciphertext is intact and block-aligned (length is a multiple of 16 for AES, 8 for 3DES) and was not truncated or re-padded.","Check the plaintext was encrypted with PKCS#5/PKCS#7 padding, not zero padding or an AEAD mode like GCM.","Log (never print) a short hash of key/IV/ciphertext to correlate failing inputs, and surface the wrapped cause with errors.Is/As."],"exampleFix":"Verify key and IV derivation before decrypting: key, err := getAESKey(); if err != nil { return nil, err }; plain, err := AESCBCDecrypt(key, iv, ciphertext); if err != nil { return nil, fmt.Errorf(\"read cookies: %w\", err) } — confirm the key matches the profile that encrypted the data and the ciphertext was produced with PKCS#5 padding.","handlingStrategy":"validation","validationCode":null,"typeGuard":null,"tryCatchPattern":null,"preventionTips":[],"tags":[],"backgroundTag":null,"analyzedSha":"0503d04d7a8d0379d060268a74f1b149e5a0aad5","analyzedAt":"2026-09-06T13:38:28.707Z","contentChangedAt":"2026-09-06T13:38:28.707Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}