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RSA Algorithm in Delphi 3

Posted on 1997-11-25
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Last Modified: 2012-06-22
Does anyone know how to implement the RSA encryption/decryption algorithm in a delphi program. I'm not interested in some DCU, but if someone could just help me get started
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Question by:carceri
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aluiken earned 120 total points
ID: 1351804
Hi Carceri,

The encryption key is:   C = M to the power of e MOD n

         where C is the encrypted byte(s)
               M is the byte(s) to be encrypted
               n is the product of p and q
               p is a prime number
               q is a prime number
               e is a number that  gcd(e,(p-1),(q-1)) = 1

  The decryption key is:   M = C to the power of d MOD n

         Where C is the encrypted byte(s)
               M is the original byte(s)
               n is the product of p and q
               p is a prime number
               q is a prime number
               d is the inverse of the module MOD (p-1)(q-1)

So what you have to do now is code a proc something like:

Procedure Encrypt(Fn,OFN : String);
Var I,O : File;
    Cnt : LongInt;
    Buf : Array[1..4096] Of Byte;
Begin
 AssignFile(I,Fn);
 Reset(I,1);
 AssignFile(O,OFn);
 Rewrite(O,1);
  Repeat
   FillChar(Buf,SizeOf(Buf),#0);
   BlockRead(I,Buf,SizeOf(Buf),Nr);
    For Cnt := 1 To 4096 Do Begin
                             Buf[I] := ........
                             Process Encryption Here !
                            End;
   BlockWrite(O,Buf,Nr,Nw);
  Until (Nr <> Nw) Or (Nr = 0);
 Close(O);
 Close(I);
End;
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