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DecryptStandard (Function) In french: DécrypteStandard
 Warning
From version 24, UncryptStandard is kept for backward compatibility. This function has been replaced with DecryptStandard.
Decrypts a message that was encrypted with a standard encryption algorithm. Unlike Encrypt and Decrypt, EncryptStandard and DecryptStandard use the standard encryption algorithms that allow you to exchange encrypted messages between different runtime platforms (Windows, Linux, Android, Java, iOS, PHP, etc.) and/or with external tools.
sMessage is Buffer = "Message à crypter"
sMotPasse is string ANSI = "mot de passe"
bufClé is Buffer = HashString(HA_MD5_128, sMotPasse)
bufCrypte is Buffer = EncryptStandard(sMessage, bufClé, encryptAES128)
bufRésultat is Buffer = DecryptStandard(bufCrypte, bufClé, encryptAES128)
Info(bufRésultat)
Syntax
<Result> = DecryptStandard(<Encrypted message> , <Key> [, <Algorithm> [, <Operation mode> [, <Padding>]]])
<Result>: Binary buffer - Result of decryption for the specified message,
- Empty string ("") if an error occurred. To get more details on the error, use ErrorInfo.
<Encrypted message>: Binary buffer Message to decrypt. This message can be the encryption result obtained during the call to EncryptStandard.This buffer must include two sections: - The initialization vector (or IV) used to encrypt data.
- The encrypted data.
If the message was encrypted: - by EncryptStandard, this parameter must correspond to the value returned by the function.
- by an external tool, the buffer must be built by concatenating the encrypted data to initialization vector used.
Note: if the operating mode specified is crypteECBno initialization vector has been used to encrypt the message, in which case the parameter must correspond directly to the encrypted data. <Key>: Buffer or Secret string Key with which the data was encrypted. This key must be identical to the one supplied when encrypting the message.
 New in version 2025Secret strings: If you use the secret string vault, the type of secret string used for this parameter can be "Buffer - ASCII" or "Buffer - UTF-8". To learn more about secret strings and how to use the vault, see Secret string vault. New in version 2025 <Algorithm>: Optional Integer constant Encryption algorithm used. This parameter must correspond to the algorithm used to encrypt the message. | | New in version 2025cryptAES192 | Advanced Encryption Standard. - Key size: 192 bits.
- Block size: 128 bits.
- Initialization vector (IV) size: 128 bits.
| | encrypt3DES | Triple Data Encryption Standard. - Key size: 192 bits.
- Block size: 64 bits.
- Initialization vector (IV) size: 64 bits.
| encryptAES128
(Default value) | Advanced Encryption Standard. - Key size: 128 bits.
- Block size: 128 bits.
- Initialization vector (IV) size: 128 bits.
| | encryptAES256 | Advanced Encryption Standard. - Key size: 256 bits.
- Block size: 128 bits.
- Initialization vector (IV) size: 128 bits.
| | encryptDES | Data Encryption Standard. - Key size: 64 bits.
- Block size: 64 bits.
- Initialization vector (IV) size: 64 bits.
Warning: this algorithm is currently deprecated. |
<Operation mode>: Optional Integer constant Process mode of blocks by the encryption algorithm used. This parameter must correspond to the operation mode used to encrypt the message. | | encryptCBC
(Default value) | Cipher Block Chaining - Sequence of blocks. | | encryptCFB | Cipher Feedback - Feedback encryption. New in version 2025From now on, this processing mode is available regardless of the algorithm used. | | encryptCTR | Cipher Counter - Encryption based on a counter. New in version 2025From now on, this processing mode is available regardless of the algorithm used. | | encryptECB | Electronic Code Book - Dictionary of codes. This mode of operation is not recommended and should only be used for compatibility reasons. |
<Padding>: Optional Integer constant Padding mode for encrypted data to be compatible with the size required by block encryption algorithms. This parameter must correspond to the fill mode used to encrypt the message. | | encryptPaddingPKCS
(Default value) | The data is filled with bytes whose value corresponds to the total number of bytes added to reach the requested size. | | encryptPaddingZero | The data is filled with binary zeros until the requested size is reached. |
Remarks Compatibility The old Encrypt and Decrypt functions used a proprietary internal encryption format.. A string encrypted using the Encrypt algorithm cannot therefore be decrypted using the usual algorithms to which the DecryptStandard function. To change your encryption solution, you must: - decrypt all current encrypted data (function Decrypt)
- encrypt this data with function EncryptStandard and a new algorithm.
Related Examples:
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Unit examples (WINDEV): The encryption functions
[ + ] Using the encryption/decryption functions of WINDEV. This example is used to: - Encrypt a character string - Decrypt a character string
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Business / UI classification: Business Logic
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