Decrypt (Function)

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Encrypting and decrypting an external file
Decrypting a stream in base64binary format
Encryption in Android/Java and decryption by a WINDEV application (or conversely)

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WEBDEV

WINDEV Mobile

Others

See also

Decrypt (Function)

In french: Décrypte

Warning
From version 24, Uncrypt is kept for backward compatibility. This function is replaced by Decrypt.

Decrypts a character string that was encrypted by Encrypt.

Versions 20 and later
Note: If the encryption and the decryption are performed on different platforms (encryption in Android and decryption in Windows for example), use EncryptStandard and DecryptStandard. See "Remarks" for more details.

New in version 20
Note: If the encryption and the decryption are performed on different platforms (encryption in Android and decryption in Windows for example), use EncryptStandard and DecryptStandard. See "Remarks" for more details.

Note: If the encryption and the decryption are performed on different platforms (encryption in Android and decryption in Windows for example), use EncryptStandard and DecryptStandard. See "Remarks" for more details.

Versions 16 and later

This function is now available for the WINDEV applications in Linux.

New in version 16

This function is now available for the WINDEV applications in Linux.

Versions 18 and later

This function is now available in Windows Store apps mode.

New in version 18

This function is now available in Windows Store apps mode.

Versions 21 and later

This function is now available in Universal Windows 10 App mode.

New in version 21

This function is now available in Universal Windows 10 App mode.

Example

See additional examples

// Encrypt a string
ResEncrypt = Encrypt("The number of my bank account in Switzerland is 74538290", "Password")
...
// Decrypt the string
Res = Decrypt(ResEncrypt, "Password")

// Decode the data encoded in base 64
bufDecode is Buffer = Decrypt(bufBase64, "", crypteNone, encodeBASE64)

Syntax

<Result> = Decrypt(<Encrypted string> , <Password> [, <Type of encryption used> [, <Format of encrypted string>]])

<Result>: Character string

Decrypted character string,
Empty string ("") if an error occurred. To find out the error details, use ErrorInfo.

<Encrypted string>: Character string (with quotes)

Encrypted character string. This character string was encrypted by Encrypt.

<Password>: Character string (with quotes)

Password used to decrypt the character string. This password must be identical to the password that was used to encrypt the character string. A long password provides better encryption security.

<Type of encryption used>: Optional constant (or combination of constants)

Specifies the type of encryption and compression performed. This parameter must be identical to the one specified during the encryption.
Type of encryption:
cryptAnsi
This constant has no effect.
cryptNone No encryption was performed.
cryptFast
(Default value) Priority was given to the encryption speed (algorithm on 128 bits).
The algorithm used will be a Blowfish algorithm.
cryptRC516 Priority was given to the encryption security (RC5 algorithm on 16 rounds).
This constant has no effect.
cryptSecure Priority was given to the encryption security (RC5 algorithm on 128 bits).
The algorithm used will be a PBE algorithm (Password Based Encryption).
Type of Compression:
compressNone
(Default value) No compression is performed.
This constant has no effect.
compressShortString The string is compressed via an algorithm optimized for the short character strings. This compression will be efficient only if the cryptNone constant is selected and if <Format of encrypted string> corresponds to the encodeNone constant.
This constant has no effect.
compressLZW The string is compressed before it is encrypted.
This constant has no effect.

<Format of encrypted string>: Optional Integer constant

Indicates the format of the encrypted string. This parameter must be identical to the one specified during the encryption.
encodePCS or True
(Default value) ASCII format. The encrypted file contains printable characters only.
encodeNone or False Binary format. The encrypted file may contain non-printable characters.
encodeBASE64 BASE 64 format. The encrypted file contains printable characters only.
To decode a buffer in base 64, you also have the ability to use Decode associated with the encodeBASE64 constant.
encodeUUEncode UUEncode format. The encrypted file contains printable characters only.
This parameter is ignored.

Remarks

Encrypting and decrypting an external file

To encrypt/decrypt an external file, use fEncrypt and fDecrypt.

Decrypting a stream in base64binary format

To decrypt a string encrypted in base64, you must use:

ResultString = Decrypt(EncryptedString, "", cryptNone, encodeBASE64)
// or
ResultString = Decrypt(EncryptedString, encodeBASE64)

Encryption in Android/Java and decryption by a WINDEV application (or conversely)

Caution: the encryption/decryption algorithms used in Java and Android differ from the ones used by WINDEV. Therefore, you cannot encrypt a character string in Java or Android and decrypt it with WINDEV (and conversely).

Versions 20 and later
To encrypt a character string in Java or Android and to decrypt it with WINDEV (or conversely), use EncryptStandard and DecryptStandard.

New in version 20
To encrypt a character string in Java or Android and to decrypt it with WINDEV (or conversely), use EncryptStandard and DecryptStandard.

To encrypt a character string in Java or Android and to decrypt it with WINDEV (or conversely), use EncryptStandard and DecryptStandard.

Related Examples:

Unit examples (WEBDEV): The encryption functions

[ + ] This example explains how to use the encryption/decryption functions of WEBDEV. This example allows you to:
- Encrypt a character string
- Decrypt a character string

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

Unit examples (WINDEV Mobile): The encryption functions

[ + ] Using the WLanguage encryption and decryption functions.
This example is used to:
- Encrypt a character string
- Decrypt a character string

Component : wd260std.dll