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POJava asymmetric encryption: preferred way to store public/private keys
 

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    <p>This code generates a pair of public/private keys:</p> <pre><code>KeyPairGenerator keyGen = KeyPairGenerator.getInstance("RSA"); keyGen.initialize(1024); KeyPair keypair = keyGen.genKeyPair(); PrivateKey privateKey = keypair.getPrivate(); PublicKey publicKey = keypair.getPublic(); </code></pre> <p>What I'd like to know is how do you usually store the public key:</p> <p><strong>Option 1: store the bytes</strong></p> <pre><code>byte[] privateKeyBytes = privateKey.getEncoded(); byte[] publicKeyBytes = publicKey.getEncoded(); // ... write to file // convert bytes back to public/private keys KeyFactory keyFactory = KeyFactory.getInstance("RSA"); EncodedKeySpec privateKeySpec = new PKCS8EncodedKeySpec(privateKeyBytes); PrivateKey privateKey = keyFactory.generatePrivate(privateKeySpec); EncodedKeySpec publicKeySpec = new X509EncodedKeySpec(publicKeyBytes); PublicKey publicKey = keyFactory.generatePublic(publicKeySpec); </code></pre> <p>What I don't like is to tie the code to concrete implementations such as <code>PKCS8EncodedKeySpec</code> and <code>X509EncodedKeySpec</code>.</p> <p><strong>Option 2: store the modulus and exponent</strong></p> <pre><code>KeyFactory fact = KeyFactory.getInstance("RSA"); RSAPublicKeySpec pub = fact.getKeySpec(publicKey, RSAPublicKeySpec.class); RSAPrivateKeySpec priv = fact.getKeySpec(privateKey,RSAPrivateKeySpec.class); // store modulus and exponent as BigIntegers BigInteger modulus = pub.getModulus()); BigInteger exponent = pub.getPublicExponent()); // ... write to file // recreate public key (the same applies to the private key) RSAPublicKeySpec keySpec = new RSAPublicKeySpec(modulus, exponent); KeyFactory fact = KeyFactory.getInstance("RSA"); PublicKey pubKey = fact.generatePublic(keySpec); </code></pre> <p>The second option is easier to implement, but I don't know if it could be less performant.</p> <p>Any advise ?</p>
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    1. USGuido García
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      1. USAdam Paynter
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