StackOverflow2013

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PO
primarykey
Id
14582408
data
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0
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0
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CreationDate
2013-01-29T12:01:27.327
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0
LastActivityDate
2014-04-11T14:21:32.600
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2014-04-11T14:21:32.600
LastEditorUserId
314104
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1540206
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3531506
PostTypeId
2
Score
5
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0
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text
Body
<p>If you want reverse the process, i.e. encode a <code>PublicKey</code> Java object to a Linux <code>authorized_keys</code> entry format, one can use this code:</p> <pre><code> /** * Encode PublicKey (DSA or RSA encoded) to authorized_keys like string * * @param publicKey DSA or RSA encoded * @param user username for output authorized_keys like string * @return authorized_keys like string * @throws IOException */ public static String encodePublicKey(PublicKey publicKey, String user) throws IOException { String publicKeyEncoded; if(publicKey.getAlgorithm().equals("RSA")){ RSAPublicKey rsaPublicKey = (RSAPublicKey) publicKey; ByteArrayOutputStream byteOs = new ByteArrayOutputStream(); DataOutputStream dos = new DataOutputStream(byteOs); dos.writeInt("ssh-rsa".getBytes().length); dos.write("ssh-rsa".getBytes()); dos.writeInt(rsaPublicKey.getPublicExponent().toByteArray().length); dos.write(rsaPublicKey.getPublicExponent().toByteArray()); dos.writeInt(rsaPublicKey.getModulus().toByteArray().length); dos.write(rsaPublicKey.getModulus().toByteArray()); publicKeyEncoded = new String( Base64.encodeBase64(byteOs.toByteArray())); return "ssh-rsa " + publicKeyEncoded + " " + user; } else if(publicKey.getAlgorithm().equals("DSA")){ DSAPublicKey dsaPublicKey = (DSAPublicKey) publicKey; DSAParams dsaParams = dsaPublicKey.getParams(); ByteArrayOutputStream byteOs = new ByteArrayOutputStream(); DataOutputStream dos = new DataOutputStream(byteOs); dos.writeInt("ssh-dss".getBytes().length); dos.write("ssh-dss".getBytes()); dos.writeInt(dsaParams.getP().toByteArray().length); dos.write(dsaParams.getP().toByteArray()); dos.writeInt(dsaParams.getQ().toByteArray().length); dos.write(dsaParams.getQ().toByteArray()); dos.writeInt(dsaParams.getG().toByteArray().length); dos.write(dsaParams.getG().toByteArray()); dos.writeInt(dsaPublicKey.getY().toByteArray().length); dos.write(dsaPublicKey.getY().toByteArray()); publicKeyEncoded = new String( Base64.encodeBase64(byteOs.toByteArray())); return "ssh-dss " + publicKeyEncoded + " " + user; } else{ throw new IllegalArgumentException( "Unknown public key encoding: " + publicKey.getAlgorithm()); } } </code></pre>
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1. This table or related slice is empty.
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1. POUsing public key from authorized_keys with Java security
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PostTypePostTypeId
1. PTAnswer
UserLastEditorUserId
1. USuser314104
UserOwnerUserId
1. USgotoalberto
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