Shiro 的CryptFormat源码

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package org.apache.shiro.crypto.hash.format;import org.apache.shiro.codec.Base64;import org.apache.shiro.crypto.hash.Hash;import org.apache.shiro.crypto.hash.SimpleHash;import org.apache.shiro.util.ByteSource;import org.apache.shiro.util.StringUtils;public class Shiro1CryptFormat implements ModularCryptFormat, ParsableHashFormat {    public static final String ID = "shiro1";    public static final String MCF_PREFIX = TOKEN_DELIMITER + ID + TOKEN_DELIMITER;    public Shiro1CryptFormat() {    }    public String getId() {        return ID;    }    public String format(Hash hash) {        if (hash == null) {            return null;        }        String algorithmName = hash.getAlgorithmName();        ByteSource salt = hash.getSalt();        int iterations = hash.getIterations();        StringBuilder sb = new StringBuilder(MCF_PREFIX).append(algorithmName).append(TOKEN_DELIMITER).append(iterations).append(TOKEN_DELIMITER);        if (salt != null) {            sb.append(salt.toBase64());        }        sb.append(TOKEN_DELIMITER);        sb.append(hash.toBase64());        return sb.toString();    }    public Hash parse(String formatted) {        if (formatted == null) {            return null;        }        if (!formatted.startsWith(MCF_PREFIX)) {            //TODO create a HashFormatException class            String msg = "The argument is not a valid '" + ID + "' formatted hash.";            throw new IllegalArgumentException(msg);        }        String suffix = formatted.substring(MCF_PREFIX.length());        String[] parts = suffix.split("\\$");        //last part is always the digest/checksum, Base64-encoded:        int i = parts.length-1;        String digestBase64 = parts[i--];        //second-to-last part is always the salt, Base64-encoded:        String saltBase64 = parts[i--];        String iterationsString = parts[i--];        String algorithmName = parts[i];        byte[] digest = Base64.decode(digestBase64);        ByteSource salt = null;        if (StringUtils.hasLength(saltBase64)) {            byte[] saltBytes = Base64.decode(saltBase64);            salt = ByteSource.Util.bytes(saltBytes);        }        int iterations;        try {            iterations = Integer.parseInt(iterationsString);        } catch (NumberFormatException e) {            String msg = "Unable to parse formatted hash string: " + formatted;            throw new IllegalArgumentException(msg, e);        }        SimpleHash hash = new SimpleHash(algorithmName);        hash.setBytes(digest);        if (salt != null) {            hash.setSalt(salt);        }        hash.setIterations(iterations);        return hash;    }}
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