IvParameterSpec value different for each print
When trying to understand a problem I faced an interesting problem. The IvParameterSpec class cannot hold the IV fixed. It changes for every println.
I am using the javac 10.0.2 version on Ubuntu Linux
import javax.crypto.spec.IvParameterSpec;
import java.util.Base64;
public class Encryptor {
public static void main(String args) {
IvParameterSpec ctr_iv;
String IV = "0102030405060708";
byte counter = IV.getBytes();
ctr_iv = new IvParameterSpec(counter);
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
}
}
Each of the println prints different values.
ctr_iv = [B@42f30e0a
ctr_iv = [B@24273305
ctr_iv = [B@5b1d2887
ctr_iv = [B@46f5f779
ctr_iv = [B@1c2c22f3
ctr_iv = [B@18e8568
What is the problem here? Shouldn't the values be the same?
java linux encryption
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
add a comment |
When trying to understand a problem I faced an interesting problem. The IvParameterSpec class cannot hold the IV fixed. It changes for every println.
I am using the javac 10.0.2 version on Ubuntu Linux
import javax.crypto.spec.IvParameterSpec;
import java.util.Base64;
public class Encryptor {
public static void main(String args) {
IvParameterSpec ctr_iv;
String IV = "0102030405060708";
byte counter = IV.getBytes();
ctr_iv = new IvParameterSpec(counter);
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
}
}
Each of the println prints different values.
ctr_iv = [B@42f30e0a
ctr_iv = [B@24273305
ctr_iv = [B@5b1d2887
ctr_iv = [B@46f5f779
ctr_iv = [B@1c2c22f3
ctr_iv = [B@18e8568
What is the problem here? Shouldn't the values be the same?
java linux encryption
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
1
You would expectIvParameterSpecto behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.
– James K Polk
Nov 24 '18 at 16:55
add a comment |
When trying to understand a problem I faced an interesting problem. The IvParameterSpec class cannot hold the IV fixed. It changes for every println.
I am using the javac 10.0.2 version on Ubuntu Linux
import javax.crypto.spec.IvParameterSpec;
import java.util.Base64;
public class Encryptor {
public static void main(String args) {
IvParameterSpec ctr_iv;
String IV = "0102030405060708";
byte counter = IV.getBytes();
ctr_iv = new IvParameterSpec(counter);
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
}
}
Each of the println prints different values.
ctr_iv = [B@42f30e0a
ctr_iv = [B@24273305
ctr_iv = [B@5b1d2887
ctr_iv = [B@46f5f779
ctr_iv = [B@1c2c22f3
ctr_iv = [B@18e8568
What is the problem here? Shouldn't the values be the same?
java linux encryption
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
When trying to understand a problem I faced an interesting problem. The IvParameterSpec class cannot hold the IV fixed. It changes for every println.
I am using the javac 10.0.2 version on Ubuntu Linux
import javax.crypto.spec.IvParameterSpec;
import java.util.Base64;
public class Encryptor {
public static void main(String args) {
IvParameterSpec ctr_iv;
String IV = "0102030405060708";
byte counter = IV.getBytes();
ctr_iv = new IvParameterSpec(counter);
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
System.out.println("ctr_iv = "+ ctr_iv.getIV());
}
}
Each of the println prints different values.
ctr_iv = [B@42f30e0a
ctr_iv = [B@24273305
ctr_iv = [B@5b1d2887
ctr_iv = [B@46f5f779
ctr_iv = [B@1c2c22f3
ctr_iv = [B@18e8568
What is the problem here? Shouldn't the values be the same?
java linux encryption
java linux encryption
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
edited Nov 24 '18 at 14:15
Ishaan Javali
1,3493820
1,3493820
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
asked Nov 24 '18 at 14:13
kelalakakelalaka
1,52121124
1,52121124
1
You would expectIvParameterSpecto behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.
– James K Polk
Nov 24 '18 at 16:55
add a comment |
1
You would expectIvParameterSpecto behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.
– James K Polk
Nov 24 '18 at 16:55
1
1
You would expect
IvParameterSpec to behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.– James K Polk
Nov 24 '18 at 16:55
You would expect
IvParameterSpec to behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.– James K Polk
Nov 24 '18 at 16:55
add a comment |
1 Answer
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votes
According to the documentation of the method IvParameterSpec.getIV():
Returns a new array each time this method is called.
So your assumption that the values should be the same might be true, but it is always a new array.
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
add a comment |
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1 Answer
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According to the documentation of the method IvParameterSpec.getIV():
Returns a new array each time this method is called.
So your assumption that the values should be the same might be true, but it is always a new array.
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
add a comment |
According to the documentation of the method IvParameterSpec.getIV():
Returns a new array each time this method is called.
So your assumption that the values should be the same might be true, but it is always a new array.
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
add a comment |
According to the documentation of the method IvParameterSpec.getIV():
Returns a new array each time this method is called.
So your assumption that the values should be the same might be true, but it is always a new array.
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
According to the documentation of the method IvParameterSpec.getIV():
Returns a new array each time this method is called.
So your assumption that the values should be the same might be true, but it is always a new array.
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
answered Nov 24 '18 at 14:18
SeelenvirtuoseSeelenvirtuose
16.7k42848
16.7k42848
add a comment |
add a comment |
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1
You would expect
IvParameterSpecto behave like an immutable class. The only way to do so is to return a copy of its underlying byte array.– James K Polk
Nov 24 '18 at 16:55