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(Ruby) RSA Encryption -- Same Key Different ResultsThe RSA encryption algorithm produces different results for each call, even when encrypting the same data with the same key. Decryption however, will produce the correct results. This example demonstrates. *** The reason this occurs is that RSA encryption uses PKCS1 v1.5 padding, and this padding scheme uses random bytes. It is random bytes in the padding that causes the result to be different each time. 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() pubKeyXml = "<RSAPublicKey><Modulus>xxyv1RDPU0MvfFIIa98HppXdcuI7zSu8uIqyGAy/VoxPvxZFX0acajznvjVRHipHbpcO6ryo2LwXUPf89qOqLb3Qd1lfD2ZnH+TQ6MZXNxfFRxTpTUd+tTR4EBYpd2t6kzq8ZRJYLdlviaMQQqUEwR54k7Op5HJYVKUcHIkP1xE=</Modulus><Exponent>AQAB</Exponent></RSAPublicKey>" privKeyXml = "<RSAKeyValue><Modulus>xxyv1RDPU0MvfFIIa98HppXdcuI7zSu8uIqyGAy/VoxPvxZFX0acajznvjVRHipHbpcO6ryo2LwXUPf89qOqLb3Qd1lfD2ZnH+TQ6MZXNxfFRxTpTUd+tTR4EBYpd2t6kzq8ZRJYLdlviaMQQqUEwR54k7Op5HJYVKUcHIkP1xE=</Modulus><Exponent>AQAB</Exponent><P>4cpW9fvG99Jsz8/AO7PDHTl+pPRAglksrR2kClLV2g9DEeFe/bvmCxLUgMCJ+0eGQ1zA6aA7McKr13zTQ7jKpQ==</P><Q>4cCS/kFlq/P1ExF37Fkh4pCodOEGutepLEG7Q/KljT3ZGlAY+2l8fGu4f+hrkUuGoFl7NOMaJflULoPIgQaq/Q==</Q><DP>lkjcSsvzqh3YKRXJiLNkyf3rypV8noYGU4+oEOsDxilkZfFRDafUPUiiQrRk4ui/d/SzvozU+ZDuWfaOk8PatQ==</DP><DQ>SYCD25i7W8Mwdibn3uIecEAdOQDTSh5RjIFSUYs9b8FFYJXXrHPp/jCsf6jS7RmkGa1Iui1/JAIL8KEjtS7QmQ==</DQ><InverseQ>EDAJa3TpNdPQ3GIdBpnTgFTQY5A60DcszsUW/iCYoXQdPVJ9BLBxVTe9jiLzGuNuzLkVBwQlCy0Bf84hACRV9A==</InverseQ><D>cMFdDYKkddlRNczaugOmOH8b1egpx2liSPs6GYZ2gFObAXJiPK8m+r6c2ckls7hrlUP0DZhi4cG6Tn7xANb0Ek17P7QquVhQYOmFy/YHzm+IJbcwwq7pJHhZBhtcjyXqfUZ+BADGE//GQbrSVwVltpOj5KcxG88NAprLn2MMxfE=</D></RSAKeyValue>" pubKey = Chilkat::CkPublicKey.new() success = pubKey.LoadFromString(pubKeyXml) if (success == false) print pubKey.lastErrorText() + "\n"; exit end privKey = Chilkat::CkPrivateKey.new() success = privKey.LoadXml(privKeyXml) if (success == false) print privKey.lastErrorText() + "\n"; exit end success = rsa.UsePublicKey(pubKey) if (success == false) print rsa.lastErrorText() + "\n"; exit end # Encrypt a string and return the encrypted data base64-encoded: rsa.put_EncodingMode("base64") plainText = "RSA gives different results with each call, weird but OK" usePrivateKey = false encryptedStr1 = rsa.encryptStringENC(plainText,usePrivateKey) print encryptedStr1 + "\n"; # Do it again. The results are different... encryptedStr2 = rsa.encryptStringENC(plainText,usePrivateKey) print encryptedStr2 + "\n"; # Now decrypt both strings, and the results are correct # in both cases: rsa2 = Chilkat::CkRsa.new() success = rsa2.UsePrivateKey(privKey) if (success == false) print rsa.lastErrorText() + "\n"; exit end rsa2.put_EncodingMode("base64") usePrivateKey = true decryptedStr1 = rsa2.decryptStringENC(encryptedStr1,usePrivateKey) print decryptedStr1 + "\n"; decryptedStr2 = rsa2.decryptStringENC(encryptedStr2,usePrivateKey) print decryptedStr2 + "\n"; |
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