<Buffer type>.DecryptAsymmetric (Function)

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<Buffer type>.DecryptAsymmetric (Function)

In french: <Type Buffer>.DécrypteAsymétrique

Decrypts a buffer with a private/public key algorithm with RSA encryption. The data has been previously encrypted with <Buffer type>.EncryptAsymmetric.

Example

// Encrypting a character string
// ---------------------------------------
bufToEncrypt is Buffer = "Message to encrypt"
bufEncryptedMessage is Buffer
sPublicKeyFile is string = fExeDir() + "\PublicKey.pem"
sPublicKeyPassword is string = "xxx"

bufEncryptedMessage = bufToEncrypt.EncryptAsymmetric(sPublicKeyFile, ...
sPublicKeyPassword, cryptPaddingPKCS1)

// Decryption
// -------------
bufEncryptedMessage is Buffer
bufDecryptedMessage is Buffer
sPrivateKeyFile is string = fExeDir() + "\PrivateKey.pem"
sPrivateKeyPassword is string = "xxx"

bufDecryptedMessage = bufEncryptedMessage.DecryptAsymmetric(sPrivateKeyFile, ...
sPrivateKeyPassword, cryptPaddingPKCS1)

bufToEncrypt is Buffer = StringToUTF8("สวัสดี Test")
bufPrivateKey is Buffer
bufPublicKey is Buffer
(bufPrivateKey, bufPublicKey) = EncryptGenerateRSAKey(1024)
// Encryption
bufEncrypted is Buffer = bufToEncrypt.EncryptAsymmetric(bufPublicKey)
bufSign is Buffer = CertificateSignString(bufEncrypted, bufPrivateKey, "", ...
certSignatureOnly + certSHA256)
// Decryption
IF CertificateCheckString(bufEncrypted, bufSign, bufPublicKey, "", "", ...
certSignatureOnly + certSHA256) THEN
bufReadable is Buffer = bufEncrypted.DecryptAsymmetric(bufPrivateKey)
Trace("Authentic message")
Trace(bufReadable.UTF8ToString())
ELSE
Trace("Unauthenticated message")
END

Syntax

<Result> = <Content to decrypt>.DecryptAsymmetric(<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.
Buffer 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).

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