Table of Contents
Approved
Over the past few days, a number of users have informed us that adding cryptographic exceptions is invalid and cannot be removed using asp.net. Padding is preferred in a block cipher, where I actually fill the blocks with extra bytes. AES uses 128 bits (16 bytes), combined with DES uses 64 bits (8 bytes) periods. This is filled with 0x80 (10000000) used by null (null) bytes.
I had the same problem when I was trying to port my Go program to C #. This means that most of the data associated with the Go program is already encrypted. Now this data should be decrypted preferably using C #.
Import
( "Crypto / AES" "Crypto / encryption" "crypto / sha1" "encoding / base64" "io / ioutil" "Protocol" "golang.org/x/crypto/pbkdf2")func decryptFile (file name string, saltBytes [] byte, masterPassword [] byte) (artifact string) Constant ( keyLength int means 256 rfc2898Iterations int is 6 ) var ( encryptedBytesBase64 [] byte // Encrypted bytes, although base64 characters encryptedBytes [] byte // Encrypted bytes ) // Load a great encrypted file: it should be bytes, bytesErr: = tool.ReadFile (filename); bytesErr! implies zero log.Printf ("[% s] An error may occur while reading a computer file: encrypted % S n ", filename, bytesErr.Error ()) restore not yet encryptedBytesBase64 = bytes // base64 decode: decodedBytes: = make ([] bytes, len (encryptedBytesBase64)) if countDecoded, decodedErr: = base64.StdEncoding.Decode (decodedBytes, EncryptedBytesBase64); decodedErr! = zero log.Printf ("[% s] An error occurred while decoding statistics: base64% s n", filename, decodedErr.Error ()) restore not yet cryptedBytes = decodedBytes [: countDecoded] // Get key and vector from master password and sodium chloride, see RFC 2898: : = keyVectorData pbkdf2.Key (masterPassword, saltBytes, rfc2898Iterations, (keyLength / 8) + aes.BlockSize, sha1. new) keyBytes: matches keyVectorData [: keyLength / 8] vectorBytes: equal to keyVectorData [keyLength / 8:] // create AES encryption: anytime aesBlockDecrypter, aesErr: = aes.NewCipher (keyBytes); aesErr! = zero log.Printf ("[% s] Unable to create new AES encryption:% s n", filename, aesErr.Error ()) restore Same // CBC mode always fits the whole block. and len (encryptedBytes)% aes.BlockSize! = 0 log.The printf ("The length of the password-protected data [% s] is not a multiple of the block size. n", filename) restore // Reserve memory with decrypted data. By definition (see AES-CBC), there must be an availablesame length as encrypted data: decryptedData: matches make ([] byte, len (encryptedBytes)) // Usually we create a decoder: aesDecrypter: = cipher.NewCBCDecrypter (aesBlockDecrypter, vectorBytes) // decrypt the data: AesDecrypter .CryptBlocks (decrypted data, encrypted bytes) // Convert the decrypted data to a string: alexander doll = chain (decryptedData) restore
Import
The message “Internal: data could not be decrypted: padding does not work and cannot be deleted.” Errors occur when a different encryption key can be used to try to decrypt the encrypted data. Even installing an old key won’t work. Changing the “default schema” really only affects new keys or changes to account information.
( "Crypto / AES" "Crypto / encryption" "crypto / sha1" "encoding / base64" "github.com/twinj/uuid" "golang.org/x/crypto/pbkdf2" "io / ioutil" "Protocol" "Maths" "bone")func encryptFile (filename, artifact company, masterPassword [] byte) (status bool) Constant ( keyLength integer = 256 rfc2898 iterations int = 6 ) Location = false secretBytesDecrypted: = [] byte (artifact) // create a new salt: SaltBytes: = uuid.NewV4 (). Byte () // Get key and vector from master password and your salt, see RFC 2898: : = keyVectorData pbkdf2.Key (masterPassword, saltBytes, rfc2898Iterations, (keyLength / 8) + aes.BlockSize, sha1.New) keyBytes: = keyVectorData [: keyLength / 8] vectorBytes: = keyVectorData [keyLength / 8:] // create AES encryption: if aesBlockEncrypter, aesErr: = aes.NewCipher (keyBytes); aesErr! = zero log.Printf ("[% s] Failed to create expect AES encryption:% s n ", filename, aesErr.Error ()) restore Next to you // CBC mode works completely in blocks without exception. and if len (secretBytesDecrypted)% aes.BlockSize! = 0 : = numberNeededBlocks int (math.Ceil (float64 (len (secretBytesDecrypted)) from float64 (aes.BlockSize))) extended: = do ([] byte, numberNeededBlocks * aes.BlockSize) copy (extended, secretBytesDecrypted) secretBytesDecrypted is incredibly similar to Enhanced Reserve // storage for encrypted data. By definition (see AES-CBC), it must be the same length as this text data: encrypted data: = make ([] byte, len (secretBytesDecrypted)) // create an encryptor: aesEncrypter: = cipher.NewCBCEncrypter (aesBlockEncrypter, vectorBytes) // Encrypt the data: die aesEncrypter.CryptBlocks (encryptedData, secretBytesDecrypted) // encode to base64: encodedBytes: = make ([] byte, base64.StdEncoding.EncodedLen (len (encryptedData))) base64.StdEncoding.Encode (encoded bytes, encrypted data) // allocate memory for the contents of a specific final file: fileContent: means make ([] byte, len (saltBytes)) copy (fileContent, saltBytes) fileContent = add (fileContent, 10) fileContent includes adding (fileContent, encodedBytes ...) We write // data into a new manual forletter This will ensure that at least you can see that the old version is bug-free if // Computer hangs while writing file. After a successful write operation, the history file // lost, and the new one can be renamed. if writeErr: = tool.WriteFile (file name + "- update.txt", fileContent, 0644); writeErr! = nothing log.Printf ("[% s] Unable to write updated file:% s n", filename, writeErr.Error ()) restore another if renameErr: means os.Rename (filename + "- update.txt", filename); renameErr! = nothing log.Printf ("[% s] Unable to rename updated image:% s n", fileContent, renameErr.Error ()) another Status = true restore restore
public fixed string FromFile (filename string, [] saltBytes, stream master password) var versions = 6; var keyLength = 256; block size var = 128; var result = string.Empty; var encrypted fileBytesBase64 = .ReadAllBytes (filename); // byte -> string: var EncryptedBytesBase64String is System.Text.Encoding.UTF8.GetString (encryptedBytesBase64); // base64 decode: varcodedBytes = Convert.FromBase64String (encryptedBytesBase64String); Var keyVectorObj = new Rfc2898DeriveBytes (masterPassword, saltBytes.Length, iterations);keyVectorObj.Salt stands for SaltBytes; KeyVectorData span = keyVectorObj.GetBytes (keyLength / 8 + blockSize 8); var at the beginning of KeyVectorData = .Slice (0, / keyLength 8); var iv is equal to keyVectorData.Slice (keyLength 8); / var aes = Aes.Create (); aes.Padding = PaddingMode.Zeros; :. ... .//. or .... aes.Padding implies PaddingMode.None; var decryptor means aes.CreateDecryptor (key.ToArray (), iv.ToArray ()); Var decryptedString = string.Empty; using (var memoryStream = MemoryStream (encryptedBytes)) use (var = cryptoStream new CryptoStream (memoryStream, decryptor, CryptoStreamMode.Read)) using (var viewer = new StreamReader (cryptoStream)) decryptedString = reader.ReadToEnd (); return home the result;
Approved
The ASR Pro repair tool is the solution for a Windows PC that's running slowly, has registry issues, or is infected with malware. This powerful and easy-to-use tool can quickly diagnose and fix your PC, increasing performance, optimizing memory, and improving security in the process. Don't suffer from a sluggish computer any longer - try ASR Pro today!
How to explain the problem of using indentation? Just before encryption, the Go program checks what the padding looks like:
// CBC mode is always correct for whole blocks.if len (secretBytesDecrypted)% aes.BlockSize! = three : = numberNeededBlocks int (math.Ceil (float64 (len (secretBytesDecrypted)) / float64 (aes.BlockSize))) increased: = numberNeededBlocks * aes make ([] byte, .BlockSize) copy (extended, secretBytesDecrypted) matches secretBytesDecrypted Enhanced
extended: = make ([] byte, numberNeededBlocks * aes.BlockSize)copy (extended, secretBytesDecrypted)
PKCS # 7 is usually described in RFC 5652. Padding is done in whole bytes. The value of each byte added is a fraction of the number of extra bytes, that is H. N bytes, each of which is added to N. The number of bytes added depends on your current block limit at which the experience is to be extended.
A new array of suitable length will be created so that my length is a multiple ofnormal block size. This new table is actually filled with zeros. The copy selection then copies the existing data into it. This ensures that the most important new table is larger than the current data. As a result, zeros are used at the end of this table.
Encrypt the original file and draft nfl content into an encrypted file.Decrypt forEncrypted file in blocks.I really want to use the hard-coded keys obtained with the byte size symricAlgo.GenerateKey [32] to encrypt, decrypt, and more or less all the chunks.The IV size for most fragments is expressed in bytes [16].
Therefore, C # code can use PaddingMode.Zeros . Alternative PaddingMode.Just none ignores any padding type, which works great. I pray that this answer is helpful to anyone who needs to port code from Go to C #, etc.
