sig4-java

sig4-java1.java

package com.cds.boot.Demo2.controllers;

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class RestfulController {
	
	static byte[] HmacSHA256(String data, byte[] key) throws Exception {
	    String algorithm="HmacSHA256";
	    Mac mac = Mac.getInstance(algorithm);
	    mac.init(new SecretKeySpec(key, algorithm));
	    return mac.doFinal(data.getBytes("UTF8"));
	}

	static byte[] getSignatureKey(String key, String dateStamp, String regionName, String serviceName) throws Exception {
	    byte[] kSecret = ("AWS4" + key).getBytes("UTF8");
	    byte[] kDate = HmacSHA256(dateStamp, kSecret);
	    byte[] kRegion = HmacSHA256(regionName, kDate);
	    byte[] kService = HmacSHA256(serviceName, kRegion);
	    byte[] kSigning = HmacSHA256("aws4_request", kService);
	    return kSigning;
	}
	
	private final static char[] hexArray = "0123456789ABCDEF".toCharArray();
	public static String bytesToHex(byte[] bytes) {
	    char[] hexChars = new char[bytes.length * 2];
	    for ( int j = 0; j < bytes.length; j++ ) {
	        int v = bytes[j] & 0xFF;
	        hexChars[j * 2] = hexArray[v >>> 4];
	        hexChars[j * 2 + 1] = hexArray[v & 0x0F];
	    }
	    return new String(hexChars);
	}
	
	@RequestMapping(path="/string")
	public String getString(@RequestParam(required=false) String name) throws Exception {
		String policy = "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";
		byte[] bytes = HmacSHA256(policy, getSignatureKey("wJalrXUtnFEMI/K7MDENG/bPxRfiCYEXAMPLEKEY", "20151229", "us-east-1", "s3"));
		String signature = bytesToHex(bytes);
		return signature;
	}
}