B4X Requires Chilkat v11.0.0+

RSA Decrypt using PEM

See more RSA Examples

This example demonstrates decryping RSA encrypted data that is base64 encoded. It uses a private key loaded from a PEM file. B4X

Dim success As Boolean = False

'  This example assumes the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim rsa As ChilkatRsa
rsa.Initialize

Dim key As ChilkatPrivateKey
key.Initialize("key")

'  Load an RSA private key from an unencrypted PEM file:
'  (To load from an encrypted PEM file, call LoadEncryptedPemFile instead.)

success = key.LoadPemFile("qa_data/rsa/decryptTest/priv.pem")
If success = False Then
    Log(key.LastErrorText)
    Return
End If


'  Make the key available to the RSA object
success = rsa.UsePrivateKey(key)
If success = False Then
    Log(rsa.LastErrorText)
    Return
End If


Dim encryptedStr As String = "pP9XFJEsGgxPNHEgNiLB5H5ksCOXDk/G49BPTog1jKLAhYofV4UTH5k2TOYiqRnDnKs8+8uPoN/IxdiGXvuYG8HRzN0HtkhoZO/AxeyaB9S7eddCUlT0Pl2PEB2yQ9HG5rM7jqYOD6MAM4cuX7hqT8fa8tbzJzmBwdfFDBz94bwQjULHiO+gklIBC4vhkXT4yjuvEjxTAKU6tJeZYkBooJNdS/vE5RZRpuF6bGZU41Qc17qFR+iReBq+9f8IMmw8WR8fMbOCaygOfFS1nw7JVsIMGsAIXS8rUaJ/2DfGPfQx5HCiVtTOreGYRUI3esAQjnvUCnavZyQgs53nl7e2aA=="

rsa.EncodingMode = "base64"

Dim usePrivateKey As Boolean = True
Dim decryptedStr As String = rsa.DecryptStringENC(encryptedStr, usePrivateKey)

Log("Decrypted:")
Log(decryptedStr)