(Excel) Load RSA Public Key from Hex Modulus and Exponent

Load an RSA public key from a hex modulus and exponent.

Download Excel Class Modules Chilkat Excel Class Modules

' Load a 128-byte (1024-bit) modulus + exponent into a Chilkat public key object..

modulus = "BF5F4AF9A018B5F324A0C10448C0D3248D9BE78967FDC551A27876AC5789ADCBA8245D3D942AE3799563D895DA801E765D225A54FA15DAB2C4731DD817DCF94A9AD62197074C2349442093A206234BF3747F0E88AA6F538355684CC1FB26FCE029C9050A1DAF9F507C2BABF6EFC9FB16320C8036721BE0279FBB76122C41E429"


exponent = "00000003"

' We'll need to re-encode from hex to base64..
Dim bdModulus As Chilkat.BinData
Set bdModulus = Chilkat.NewBinData
success = bdModulus.AppendEncoded(modulus,"hex")
Dim bdExponent As Chilkat.BinData
Set bdExponent = Chilkat.NewBinData
success = bdExponent.AppendEncoded(exponent,"hex")

Dim xml As Chilkat.Xml
Set xml = Chilkat.NewXml
xml.Tag = "RsaKeyValue"
xml.NewChild2 "Modulus",bdModulus.GetEncoded("base64")
xml.NewChild2 "Exponent",bdExponent.GetEncoded("base64")

' Now load into the pubkey object..
Dim pubkey As Chilkat.PublicKey
Set pubkey = Chilkat.NewPublicKey
success = pubkey.LoadFromString(xml.GetXml())
If (success = False) Then
    Debug.Print pubkey.LastErrorText
    Exit Sub
End If

Debug.Print "Success."