Example usage for javax.crypto KeyGenerator getAlgorithm

Introduction

In this page you can find the example usage for javax.crypto KeyGenerator getAlgorithm.

Prototype

public final String getAlgorithm() 

Source Link

Document

Returns the algorithm name of this KeyGenerator object.

Usage

From source file:org.apache.abdera.ext.oauth.OAuthScheme.java

private String sign(String method, String baseString, Certificate cert) throws AuthenticationException {
    if (method.equalsIgnoreCase("HMAC-MD5") || method.equalsIgnoreCase("HMAC-SHA1")) {
        try {//  w w  w  . j av a2  s .  c o m
            String[] tokens = method.split("-");
            String methodName = tokens[0].substring(0, 1).toUpperCase() + tokens[0].substring(1).toLowerCase()
                    + tokens[1];
            KeyGenerator kg = KeyGenerator.getInstance(methodName);

            Mac mac = Mac.getInstance(kg.getAlgorithm());
            mac.init(kg.generateKey());
            byte[] result = mac.doFinal(baseString.getBytes());

            return new String(Base64.encodeBase64(result));
        } catch (Exception e) {
            throw new AuthenticationException(e.getMessage(), e);
        }
    } else if (method.equalsIgnoreCase("md5")) {
        return new String(Base64.encodeBase64(DigestUtils.md5(baseString)));
    } else if (method.equalsIgnoreCase("sha1")) {
        return new String(Base64.encodeBase64(DigestUtils.sha(baseString)));
    } else if (method.equalsIgnoreCase("RSA-SHA1")) {
        if (cert == null) {
            throw new AuthenticationException("a cert is mandatory to use SHA1 with RSA");
        }
        try {
            Cipher cipher = Cipher.getInstance("SHA1withRSA");
            cipher.init(Cipher.ENCRYPT_MODE, cert);
            byte[] result = cipher.doFinal(baseString.getBytes());
            return new String(Base64.encodeBase64(result));
        } catch (Exception e) {
            throw new AuthenticationException(e.getMessage(), e);
        }
    } else {
        throw new AuthenticationException("unsupported algorithm method: " + method);
    }
}

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