DecryptAsymmetric (Function) In french: DécrypteAsymétrique Decrypts a buffer with a private/public key algorithm with RSA encryption. The data has been previously encrypted with EncryptAsymmetric.
// Encrypting a character string
// ---------------------------------------
bufToEncrypt is Buffer = "Message to encrypt"
bufEncryptedMessage is Buffer
sPublicKeyFile is string = fExeDir() + "\PublicKey.pem"
sPublicKeyPassword is string = "xxx"
bufEncryptedMessage = EncryptAsymmetric(bufToEncrypt, sPublicKeyFile, ...
sPublicKeyPassword, cryptPaddingPKCS1)
// Decryption
// -------------
bufEncryptedMessage is Buffer
bufDecryptedMessage is Buffer
sPrivateKeyFile is string = fExeDir() + "\PrivateKey.pem"
sPrivateKeyPassword is string = "xxx"
bufDecryptedMessage = DecryptAsymmetric(bufEncryptedMessage, sPrivateKeyFile, ...
sPrivateKeyPassword, cryptPaddingPKCS1)
 New in version 28
bufToEncrypt is Buffer = StringToUTF8("สวัสดี Test")
bufPrivateKey is Buffer
bufPublicKey is Buffer
(bufPrivateKey, bufPublicKey) = EncryptGenerateRSAKey(1024)
// Encryption
bufEncrypted is Buffer = EncryptAsymmetric(bufToEncrypt, bufPublicKey)
bufSign is Buffer = CertificateSignString(bufEncrypted, bufPrivateKey, "", ...
certSignatureOnly + certSHA256)
// Decryption
IF CertificateCheckString(bufEncrypted, bufSign, bufPublicKey, "", "", ...
certSignatureOnly + certSHA256) THEN
bufReadable is Buffer = DecryptAsymmetric(bufEncrypted, bufPrivateKey)
Trace("Authentic message")
Trace(UTF8ToString(bufReadable))
ELSE
Trace("Unauthenticated message")
END
Syntax
<Result> = DecryptAsymmetric(<Content to decrypt> , <Private key file> [, <Password> [, <Padding>]])
<Result>: Buffer Decrypted data. <Content to decrypt>: Buffer Buffer to decrypt. <Private key file>: Character string or Buffer - Name and path of the file corresponding to the RSA private key to be used to decrypt the data. pem and p12 key formats are supported.
New in version 28Buffer containing the RSA private key to be used to decrypt the data.
<Password>: Optional character string Key file password (if required). <Padding>: Optional Integer constant Padding mode for encrypted data (used during encryption) to be compatible with the size required by block encryption algorithms: | | | cryptPaddingOAEP | Padding according to the OAEP algorithm (Optimal Asymmetric Encryption Padding). | cryptPaddingPKCS1
(Default value) | Padding according to the PKCS 1 algorithm (Public Key Cryptographic Standards). |
Related Examples:
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Unit examples (WINDEV): Asymmetric encryption
[ + ] Using the asymmetric encryption functions (EncryptAsymmetric, DecryptAsymmetric)
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