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Added some tips for replicating RSAKey in PHP/Java.

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jules 2014-05-28 13:54:08 +01:00
parent 619716751e
commit c830483129
1 changed files with 56 additions and 0 deletions
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56
modules/juce_cryptography/encryption/juce_RSAKey.h
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@ -32,6 +32,62 @@
An object of this type makes up one half of a public/private RSA key pair. Use the
createKeyPair() method to create a matching pair for encoding/decoding.
If you need to use this class in conjunction with a compatible enc/decryption
algorithm on a webserver, you can achieve the same thing in PHP like this:
@code
include ('Math/BigInteger.php'); // get this from: phpseclib.sourceforge.net
function applyToValue ($message, $key_part1, $key_part2)
{
$result = new Math_BigInteger();
$zero = new Math_BigInteger();
$value = new Math_BigInteger (strrev ($message), 256);
$part1 = new Math_BigInteger ($key_part1, 16);
$part2 = new Math_BigInteger ($key_part2, 16);
while (! $value->equals ($zero))
{
$result = $result->multiply ($part2);
list ($value, $remainder) = $value->divide ($part2);
$result = $result->add ($remainder->modPow ($part1, $part2));
}
return strrev ($result->toBytes());
}
@endcode
..or in Java with something like this:
@code
public class RSAKey
{
static BigInteger applyToValue (BigInteger value, String key_part1, String key_part2)
{
BigInteger result = BigInteger.ZERO;
BigInteger part1 = new BigInteger (key_part1, 16);
BigInteger part2 = new BigInteger (key_part2, 16);
if (part1.equals (BigInteger.ZERO) || part2.equals (BigInteger.ZERO)
|| value.compareTo (BigInteger.ZERO) <= 0)
return result;
while (! value.equals (BigInteger.ZERO))
{
result = result.multiply (part2);
BigInteger[] div = value.divideAndRemainder (part2);
value = div[0];
result = result.add (div[1].modPow (part1, part2));
}
return result;
}
}
@endcode
Disclaimer: neither of the code snippets above are tested! Please let me know if you have
any corrections for them!
*/
class JUCE_API RSAKey
{