VB.NET Examples

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VB.NET Examples

Bounced Mail
Bz2
Character Encoding
CSV
Digital Certificates
Digital Signatures
Email
FTP
HTML to XML
HTTP
IMAP
Encryption
MHT / HTML Email
POP3
PFX
RSA
S/MIME
SMTP
Socket
Spider
SSH
SSH Tunnel
SSH Key
SFTP
Tar Archive
Upload
XML
XMP
Zip Compression
Misc

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Email Object
FileAccess
RSS
Atom
Self-Extractor
Service
PPMD
Deflate
DH Key Exchange
DSA

Byte Array
VB.NET FTPS
System.IO

Unreleased...
Bzip2
LZW
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Charset Considerations when RSA Encrypting Strings

When encrypting strings, character encoding can be an issue. Encryption algorithms operate on binary data. If for example, your string includes a character such as é, the bytes used to represent it depend on the character encoding. In an "iso" encoding such as iso-8859-1, or in a "windows" encoding, such as "windows-1252", the é is represented by a single byte. In Unicode however, whether it's utf-8 or ucs-2, the é is represented by 2 bytes. When encrypting strings, the RSA component will first convert the string to the character encoding indicated by the Charset property. When decrypting strings, the RSA component converts from the character encoding indicated by the Charset property to the application's expected charset. In VB6 for example, this would be Unicode. In C++, it's ANSI. In Java, it's utf-8.

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Dim rsa As New Chilkat.Rsa()

Dim success As Boolean
success = rsa.UnlockComponent("Anything for 30-day trial")
If (success <> true) Then
    MsgBox("RSA component unlock failed")
    Exit Sub
End If


'  RSA public key in XML format:
Dim publicKey As String
publicKey = "<RSAKeyValue><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>"

rsa.ImportPublicKey(publicKey)

'  Use the utf-8 character encoding.  When encrypting, the
'  plain text is first converted to utf-8 bytes and then
'  RSA encrypted.
rsa.Charset = "utf-8"

'  Encrypt a string and return the encrypted data base64-encoded:
rsa.EncodingMode = "base64"

Dim plainText As String
plainText = "éééé"

Dim usePrivateKey As Boolean
usePrivateKey = false
Dim encryptedStr As String
encryptedStr = rsa.EncryptStringENC(plainText,usePrivateKey)
TextBox1.Text = TextBox1.Text & encryptedStr & vbCrLf
TextBox1.Refresh()
 

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Mail Component · XML Parser