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(Ruby) RSA Encrypt RSA/ECB/OAEPWithSHA1AndMGF1PaddingDemonstrates how to RSA encrypt using RSA/ECB/OAEPWithSHA1AndMGF1Padding. Also demonstrates RSA/ECB/OAEPWithSHA-256AndMGF1Padding. Both of these terms are from Java's JCE. Note: In this context, "ECB" doesn't actually mean anything. It's a symmetric cipher mode that doesn't apply (or make sense) in this context. Note: This example requires Chilkat v11.0.0 or greater.
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() # First load a public key object with a public key. # In this case, we'll load it from a file. pubkey = Chilkat::CkPublicKey.new() success = pubkey.LoadFromFile("qa_data/pem/rsa_public.pem") if (success == false) print pubkey.lastErrorText() + "\n"; exit end # RSA encryption is limited to small amounts of data. The limit # is typically a few hundred bytes and is based on the key size and # padding (OAEP vs. PKCS1_5). RSA encryption is typically used for # encrypting hashes or symmetric (bulk encryption algorithm) secret keys. plainText = "Time is an illusion. Lunchtime doubly so." # Import the public key to be used for encrypting. success = rsa.UsePublicKey(pubkey) # To get OAEP padding, set the PkcsPadding property equal to false rsa.put_PkcsPadding(false) rsa.put_OaepHash("sha256") # Indicate we'll want hex output rsa.put_EncodingMode("hex") # Encrypt.. usePrivateKey = false encryptedStr = rsa.encryptStringENC(plainText,usePrivateKey) print encryptedStr + "\n"; # ------------------------------------------------- # Now decrypt with the matching private key. rsa2 = Chilkat::CkRsa.new() privKey = Chilkat::CkPrivateKey.new() success = privKey.LoadEncryptedPem("qa_data/pem/rsa_passwd.pem","passwd") if (success == false) print privKey.lastErrorText() + "\n"; exit end success = rsa2.UsePrivateKey(privKey) # Make sure we have the same settings used for encryption. rsa2.put_PkcsPadding(false) rsa2.put_EncodingMode("hex") rsa2.put_OaepHash("sha256") originalStr = rsa2.decryptStringENC(encryptedStr,true) print originalStr + "\n"; |
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