diff options
Diffstat (limited to 'Master/Kryptografie/krypto1/KryptModel.java')
| -rw-r--r-- | Master/Kryptografie/krypto1/KryptModel.java | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/Master/Kryptografie/krypto1/KryptModel.java b/Master/Kryptografie/krypto1/KryptModel.java new file mode 100644 index 0000000..5027ff2 --- /dev/null +++ b/Master/Kryptografie/krypto1/KryptModel.java @@ -0,0 +1,205 @@ +import java.util.Observable; + +public class KryptModel extends Observable { + private int key_t; + private int key_s; + private int mod; + private char[][] knownPlain; + private String plain; + private String cipher; + private String method; + private int modInv; + private String status; + + private KryptArith myKA=null; + + public KryptModel() { + super(); + setMethod("TAUSCH"); + key_t=1; + key_s=1; + mod=1; + myKA=new KryptArith(); + calcModInv(); + plain=""; + cipher=""; + knownPlain=new char[2][2]; + knownPlain[0][0]='1'; + knownPlain[0][1]='1'; + knownPlain[1][0]='1'; + knownPlain[1][1]='1'; + } + public int calcModInv() + { + try { + modInv=myKA.modInv(key_t, mod); + } + catch (Exception ae) { + status="Calculating mod. Inverse failed"; + return 1; + } + status="Calculated mod. Inverse successfully"; + setChanged(); + notifyObservers(); + return 0; + } + + public void setkey_t(int t) + { + key_t=t; + status="key t set successfully"; + setChanged(); + notifyObservers(); + } + public void setkey_s(int s) + { + key_s=s; + status="key s set successfully"; + setChanged(); + notifyObservers(); + } + public void setmod(int m) + { + mod=m; + status="modulus m set successfully"; + setChanged(); + notifyObservers(); + } + public void setPlain(String p) + { + plain=p.toLowerCase(); + setChanged(); + notifyObservers(); + } + public void setCipher(String c) + { + cipher=c.toUpperCase(); + setChanged(); + notifyObservers(); + } + public void setMethod(String m) + { + method=m; + setChanged(); + notifyObservers(); + } + public void setKnownPlain(char p1,char c1, char p2, char c2) + { + knownPlain[0][0]=p1; + knownPlain[1][0]=p2; + knownPlain[0][1]=c1; + knownPlain[1][1]=c2; + status="Known plaintext chars set. p1: "+ + knownPlain[0][0]+" p2: "+ + knownPlain[1][0]+" c1: "+ + knownPlain[0][1]+" c2: "+ + knownPlain[1][1]; + setChanged(); + notifyObservers(); + } + + public String getStatus() { + return status; + } + + public int getkey_t() + { + return key_t; + } + public int getkey_s() + { + return key_s; + } + public int getmod() + { + return mod; + } + public int getModInv() + { + return modInv; + } + public String getplain() + { + return plain; + } + public String getcipher() + { + return cipher; + } + public void encrypt() + { + if (method.equals("TAUSCH")) + { + if ( plain.isEmpty() == false) + { + char[] temp=plain.toCharArray(); + int tmp = 0; + for (int i=0;i<temp.length;i++) + { + tmp=(int)(temp[i]); + //tmp-=97; + tmp=((tmp + key_s) * key_t) % mod; + //tmp+=97; + temp[i]=(char)(tmp); + } + setCipher(new String(temp)); + status="Encrypted successfully"; + } + } + setChanged(); + notifyObservers(); + } + public void decrypt() + { + if (method.equals("TAUSCH")) + { + if ( cipher.isEmpty() == false) + { + char[] temp=cipher.toLowerCase().toCharArray(); + int tmp = 0; + for (int i=0;i<temp.length;i++) + { + tmp=(int)(temp[i]); + //tmp-=97; + tmp= (tmp*modInv - key_s ) % mod; + //tmp+=97; + temp[i]=(char)(tmp); + } + setPlain(new String(temp)); + status="Decrypted successfully"; + } + } + setChanged(); + notifyObservers(); + } + public void attack() { + char p1=knownPlain[0][0]; + char p2=knownPlain[1][0]; + char c1=knownPlain[0][1]; + char c2=knownPlain[1][1]; + /* + int ci1,ci2,pi1,pi2; + + ci1=((int)c1); + ci2=((int)c2); + pi1=((int)p1); + pi2=((int)p2); + */ + try { + key_t=( (c1-c2) * myKA.modInv(p1-p2,mod) )%mod; + key_s = ( ( c1 * myKA.modInv(key_t,mod) ) - p1 ) % mod; + status="Keys found"; + } + catch (Exception e) { + status="Could not find keys"; + } + setChanged(); + notifyObservers(); + } + public void genMod() { + setmod(KryptArith.gen8bitPrim()); + status="Prime successfully generated"; + setChanged(); + notifyObservers(); + } +} |