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POWrite public/private key to the SharedPreferences and use it
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  1. POWrite public/private key to the SharedPreferences and use it
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    copied!<p>I am trying to encrypt and decrypt a text with public/private keys.First of all, I create my keys and store them in sharedpreferences with this code : </p> <pre><code>SharedPreferences SP; SharedPreferences.Editor SPE; KeyPairGenerator keyGen; KeyPair keypair; PublicKey publicKey; PrivateKey privateKey; keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(1024); keypair = keyGen.genKeyPair(); privateKey = keypair.getPrivate(); publicKey = keypair.getPublic(); SPE = SP.edit(); SPE.putString("PublicKey", publicKey.toString()); SPE.putString("PrivateKey", privateKey.toString()); SPE.commit(); </code></pre> <p>In my SharedPreferences file, keys are written like this :</p> <blockquote> <p>PublicKey: RSA Public Key</p> <p>modulus: d07b8f32968cf65301fd710f9d6d036feac01d7b98c92ff979cd324d252cb257ff48d6630b33f0f68bd0ee81c3a83502a0abf0b263dc96c2b86940f7ec19ab1865626383e55cf5a37e25ef4eb6ca88a39f31becb6065434bc2236177aa5b35266fe0379164faea6ef7a92812e7aa3ef5fc488c70ab085f5564f09c0f6e927b49</p> <p>public exponent: 10001</p> <p>PrivateKey: RSA Private CRT Key</p> <p>modulus: d07b8f32968cf65301fd710f9d6d036feac01d7b98c92ff979cd324d252cb257ff48d6630b33f0f68bd0ee81c3a83502a0abf0b263dc96c2b86940f7ec19ab1865626383e55cf5a37e25ef4eb6ca88a39f31becb6065434bc2236177aa5b35266fe0379164faea6ef7a92812e7aa3ef5fc488c70ab085f5564f09c0f6e927b49</p> <p>public exponent: 10001<br> private exponent: 67ebef696c1a3fff0892e8f4bba8477a562e05844298a6cd58a5ac59401a939bc1a8f114d5d4c25c633d766640bd6c0f2f4005ef265022e6553e4220531448702e4bbf4322b9d5cf444d16eea151e5d565412b49208a73d9236607475d201affa21d374e3186f14b651b08565be4725f89fc6797a79c8433c4dd089589284a01</p> <p>primeP: ee4ad1a56f4ee3b12c198d09b08a92c349f94cc79a6143ca7140fa64c919f2d9c24c29d3b413fdc4039000b6b5feac5a764ce436db4a4a382d8ceecbc768e0d1</p> <p>primeQ: dff9a761807440b4a5a4fb04ebaa22849f6543f33168bd6e83b3c549b346661124d7879e168c1009e97c01b3fdcd7088eebd9c989b64d7c4b81ea46f9e06d0f9</p> <p>primeExponentP: 2ce01e371f8d25c819dbfdf9932ba593ed7c6b7f338d99aca8436a644c92fc6f11ee31fa5271695adea8e1d986d09d38b40aaaf7c1b86dddc28645fa4e656be1</p> <p>primeExponentQ: 21904af9fc82ef5362e3474ea4763978005eef80d92da5fd92b4f4e2a77fec39b378acf50ed1ec715fd0da7c7b9336c2fe6be1b4a8ccc2dcd2ee9c9bb165ba19</p> <p>crtCoefficient: d8ccccb874ec4c2d464e84829547507e1ebf78e506caa77950b04329957b8713e80553874b825bf5c90b214984b4657b64965867460d87aab135f43930db48ec</p> </blockquote> <p>And with this code i am trying to read this keys :</p> <pre><code>private PublicKey getPublicKey() throws UnsupportedEncodingException, NoSuchAlgorithmException, InvalidKeySpecException{ byte[] keyBytes = Base64.decodeBase64(SP.getString("PublicKey", "default value").getBytes("utf-8")); X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance("RSA"); PublicKey key = keyFactory.generatePublic(spec); return key;} </code></pre> <p>But something goes wrong.It gives InvalidKeySpecException. I thing this cannot read the keys from file.How can i fix this problem? Thank you.</p>
 

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