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SHA1加密工具类

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import java.io.Serializable;
import java.security.MessageDigest;

/**
 * @version V1.0
 * @Description: SHA、SHA1加密
 */
public class SHAUtils implements Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	public static String SHA1(String str){
	    if(str == null || str.length()==0){
	        return null;
	    }
	    char hexDigits[]={'0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f'};

	    try {
	        MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
	        mdTemp.update(str.getBytes("UTF-8"));

	        byte[] md = mdTemp.digest();
	        int j = md.length;
	        char buf[] = new char[j*2];
	        int k = 0;
	        for(int i=0;i<j;i++){
	            byte byte0 = md[i];
	            buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
	            buf[k++] = hexDigits[byte0 & 0xf];
	        }
	        return new String(buf);
	    } catch (Exception e) {
	        return null;
	    }
	}

}

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