Ruby

RSA Encrypt and Decrypt Strings

See more RSA Examples

_LANGUAGE_ sample code to RSA public-key encrypt and decrypt strings using public and private 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()

# This example also generates the public and private
# keys to be used in the RSA encryption.
# Normally, you would generate a key pair once,
# and distribute the public key to your partner.
# Anything encrypted with the public key can be
# decrypted with the private key.  The reverse is 
# also true: anything encrypted using the private
# key can be decrypted using the public key.

# Generate a 2048-bit key.  Chilkat RSA supports
# key sizes ranging from 512 bits to 4096 bits.
privKey = Chilkat::CkPrivateKey.new()
success = rsa.GenKey(2048,privKey)
if (success == false)
    print rsa.lastErrorText() + "\n";
    exit
end

pubKey = Chilkat::CkPublicKey.new()
privKey.ToPublicKey(pubKey)

plainText = "Encrypting and decrypting should be easy!"

# Start with a new RSA object to demonstrate that all we
# need are the keys previously exported:
rsaEncryptor = Chilkat::CkRsa.new()

# Encrypted output is always binary.  In this case, we want
# to encode the encrypted bytes in a printable string.
# Our choices are "hex", "base64", "url", "quoted-printable".
rsaEncryptor.put_EncodingMode("hex")

# We'll encrypt with the public key and decrypt with the private
# key.
success = rsaEncryptor.UsePublicKey(pubKey)

usePrivateKey = false
encryptedStr = rsaEncryptor.encryptStringENC(plainText,usePrivateKey)
print encryptedStr + "\n";

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

rsaDecryptor.put_EncodingMode("hex")
success = rsaDecryptor.UsePrivateKey(privKey)

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

print decryptedStr + "\n";