Solved

Posted on 2001-06-20
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I would like to save an encrypted password using the Properties.store method.  The problem is that all encryption algorithms return a byte array and I need to store a string.

Is there a way to use the store method with an encrypted password?
0
Question by:rossc
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Accepted Solution

Kobold earned 50 total points
ID: 6211988
Take your byte and transfort them in HEX format like
E50756

Code will look like:

public class Hex {

private static final char hexDigits[] = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
'A', 'B', 'C', 'D', 'E', 'F'
};

public static String toString(byte abyte0[], int i, int j) {
char ac[] = new char[j * 2];
int k = 0;
for(int l = i; l < i + j; l++) {
byte byte0 = abyte0[l];
ac[k++] = hexDigits[byte0 >>> 4 & 0xf];
ac[k++] = hexDigits[byte0 & 0xf];
}

return new String(ac);
}

public static String toString(byte abyte0[]) {
}
};
0

LVL 3

Expert Comment

ID: 6211999
I forgot to send the code for passing from string to byte:

public static byte[] fromString(String s) {
int i = s.length();
byte abyte0[] = new byte[(i + 1) / 2];
int j = 0;
int k = 0;
if(i % 2 == 1)
abyte0[k++] = (byte)fromDigit(s.charAt(j++));
while(j < i)
abyte0[k++] = (byte)(fromDigit(s.charAt(j++)) << 4 | fromDigit(s.charAt(j++)));
return abyte0;
}
0

LVL 3

Expert Comment

ID: 6212005
Oups...

public static int fromDigit(char c) {
if(c >= '0' && c <= '9')
return c - 48;
if(c >= 'A' && c <= 'F')
return (c - 65) + 10;
if(c >= 'a' && c <= 'f')
return (c - 97) + 10;
else
throw new IllegalArgumentException("invalid hex digit '" + c + "'");
}

0

Author Comment

ID: 6212582
I used the Acme.Crypto algorithm to encrypt the password.  To write it to disk, I had to create a string using ISO 8859-1 character encoding - new String(cipherText,"ISO-8859-1").

The Properties methods setProperty, getProperty, and store worked fine with the ISO-8859-1 strings.

Kobold,  your answer probably would have worked so I will give you the points.
0

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