Ruby

RSA Encrypt and Decrypt Credit Card Numbers

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt credit card numbers. The RSA key is loaded from an unencrypted PKCS8 file. Chilkat provides many ways of setting the key -- loading from both encrypted and unencrypted PEM, PKCS8, DER, PVK, etc. Keys may be loaded from files or in-memory representations. (The RSA component also provides the ability to generate RSA keys.) Ruby

require 'chilkat'

success = false

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

rsa = Chilkat::CkRsa.new()

privKey = Chilkat::CkPrivateKey.new()

# Load an RSA private key from a file:
success = privKey.LoadAnyFormatFile("rsaPrivateKey.key","")
if (success == false)
    print privKey.lastErrorText() + "\n";
    exit
end

# Get the public part of the private key.
pubKey = Chilkat::CkPublicKey.new()
privKey.ToPublicKey(pubKey)

success = rsa.UsePublicKey(pubKey)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

# Encrypt a VISA credit card number:
# 1234-5678-0000-9999
ccNumber = "1234567800009999"

usePrivateKey = false
rsa.put_EncodingMode("base64")
encryptedStr = rsa.encryptStringENC(ccNumber,usePrivateKey)
print "Encrypted:" + "\n";
print encryptedStr + "\n";

# Now decrypt:
rsaDecryptor = Chilkat::CkRsa.new()

rsaDecryptor.put_EncodingMode("base64")
rsaDecryptor.UsePrivateKey(privKey)

usePrivateKey = true
decryptedStr = rsaDecryptor.decryptStringENC(encryptedStr,usePrivateKey)

print "Decrypted:" + "\n";
print decryptedStr + "\n";

# Important: RSA encryption should only be used to encrypt small amounts of data.
# It is typically used for encrypting symmetric encryption
# keys such that a symmetric encryption algorithm, such as 
# AES is then used to encrypt/decrypt bulk data