我从这里找到了这段代码How to SHA1 hash a string in Android? 使用 SHA1 加密字符串,它工作得很好,
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class SHA1Encryption {
public static String SHA1(String text) throws NoSuchAlgorithmException,
UnsupportedEncodingException {
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(text.getBytes("iso-8859-1"), 0, text.length());
byte[] sha1hash = md.digest();
return convertToHex(sha1hash);
}
private static String convertToHex(byte[] data) {
StringBuilder buf = new StringBuilder();
for (byte b : data) {
int halfbyte = (b >>> 4) & 0x0F;
int two_halfs = 0;
do {
buf.append((0 <= halfbyte) && (halfbyte <= 9) ? (char) ('0' + halfbyte)
: (char) ('a' + (halfbyte - 10)));
halfbyte = b & 0x0F;
} while (two_halfs++ < 1);
}
return buf.toString();
}
}
但我需要将其解密回原始字符串。
谁能帮我吗?