SHA1 hashing not working as expected in Java
I am trying to write a small Java code to see how to properly use SHA1.
Following is the code snippet I came up with:
package dummyJavaExp;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Exp1 {
public static void main(String args) throws NoSuchAlgorithmException {
// TODO Auto-generated method stub
String str = "Hello there";
String hashstr = new String(MessageDigest.getInstance("SHA1").digest(str.getBytes()));
System.out.println("Encrypted value of " + str + " is: " + hashstr);
}
}
But the above code gives some weird characters as shown in the following output message when I run the above code:
Encrypted value of Hello there is: rlvU>?Þ¢‘4ónjòêìÎ
I thought the encrypted message will be some alphanumeric string.
Am I missing something in my code?
java
edited Jan 25 at 23:39
halfer
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
|
show 1 more comment
I am trying to write a small Java code to see how to properly use SHA1.
Following is the code snippet I came up with:
package dummyJavaExp;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Exp1 {
public static void main(String args) throws NoSuchAlgorithmException {
// TODO Auto-generated method stub
String str = "Hello there";
String hashstr = new String(MessageDigest.getInstance("SHA1").digest(str.getBytes()));
System.out.println("Encrypted value of " + str + " is: " + hashstr);
}
}
But the above code gives some weird characters as shown in the following output message when I run the above code:
Encrypted value of Hello there is: rlvU>?Þ¢‘4ónjòêìÎ
I thought the encrypted message will be some alphanumeric string.
Am I missing something in my code?
java
edited Jan 25 at 23:39
halfer
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
3
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
2
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36
|
show 1 more comment
I am trying to write a small Java code to see how to properly use SHA1.
Following is the code snippet I came up with:
package dummyJavaExp;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Exp1 {
public static void main(String args) throws NoSuchAlgorithmException {
// TODO Auto-generated method stub
String str = "Hello there";
String hashstr = new String(MessageDigest.getInstance("SHA1").digest(str.getBytes()));
System.out.println("Encrypted value of " + str + " is: " + hashstr);
}
}
But the above code gives some weird characters as shown in the following output message when I run the above code:
Encrypted value of Hello there is: rlvU>?Þ¢‘4ónjòêìÎ
I thought the encrypted message will be some alphanumeric string.
Am I missing something in my code?
java
edited Jan 25 at 23:39
halfer
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
I am trying to write a small Java code to see how to properly use SHA1.
Following is the code snippet I came up with:
package dummyJavaExp;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
public class Exp1 {
public static void main(String args) throws NoSuchAlgorithmException {
// TODO Auto-generated method stub
String str = "Hello there";
String hashstr = new String(MessageDigest.getInstance("SHA1").digest(str.getBytes()));
System.out.println("Encrypted value of " + str + " is: " + hashstr);
}
}
But the above code gives some weird characters as shown in the following output message when I run the above code:
Encrypted value of Hello there is: rlvU>?Þ¢‘4ónjòêìÎ
I thought the encrypted message will be some alphanumeric string.
Am I missing something in my code?
java
java
edited Jan 25 at 23:39
halfer
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
edited Jan 25 at 23:39
halfer
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
edited Jan 25 at 23:39
halfer
14.6k758112
edited Jan 25 at 23:39
halfer
14.6k758112
edited Jan 25 at 23:39
halfer
14.6k758112
14.6k758112
asked Jan 1 at 7:25
user3243499user3243499
81211226
asked Jan 1 at 7:25
user3243499user3243499
81211226
asked Jan 1 at 7:25
user3243499user3243499
81211226
81211226
3
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
2
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36
|
show 1 more comment
3
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
2
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36
3
3
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
2
2
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36
|
show 1 more comment
1 Answer
1
active
oldest
votes
When you use String sample = new String(byte bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.
Try to use Base64 or HexString to display digest message.
For example in JAVA8:
You can encode your digest bytes to string with:
String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));
You can decode your Base64 with:
byte digest = Base64.getDecoder().decode(hashstr);
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
add a comment |
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When you use String sample = new String(byte bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.
Try to use Base64 or HexString to display digest message.
For example in JAVA8:
You can encode your digest bytes to string with:
String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));
You can decode your Base64 with:
byte digest = Base64.getDecoder().decode(hashstr);
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
add a comment |
When you use String sample = new String(byte bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.
Try to use Base64 or HexString to display digest message.
For example in JAVA8:
You can encode your digest bytes to string with:
String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));
You can decode your Base64 with:
byte digest = Base64.getDecoder().decode(hashstr);
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
add a comment |
When you use String sample = new String(byte bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.
Try to use Base64 or HexString to display digest message.
For example in JAVA8:
You can encode your digest bytes to string with:
String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));
You can decode your Base64 with:
byte digest = Base64.getDecoder().decode(hashstr);
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
When you use String sample = new String(byte bytes) it will create a string with platform's default charset, your digest bytes may not have alphanumeric representation in that charset.
Try to use Base64 or HexString to display digest message.
For example in JAVA8:
You can encode your digest bytes to string with:
String hashstr = Base64.getEncoder().encodeToString(MessageDigest.getInstance("SHA1").digest(str.getBytes("UTF-8")));
You can decode your Base64 with:
byte digest = Base64.getDecoder().decode(hashstr);
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
edited Jan 1 at 7:45
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
answered Jan 1 at 7:37
Ehsan MashhadiEhsan Mashhadi
751618
751618
add a comment |
add a comment |
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3
encrypted message is array of bytes, maybe you want base64
– Iłya Bursov
Jan 1 at 7:27
ok, so how do I get alphanumeric string. I want to use the generated hashes as keys in a hashmap. I can't use bytes as keys.
– user3243499
Jan 1 at 7:29
It depends on your purpouses. If you need to encrypt a value, you must use MessageDigest; once you get the encrypted byte array you can think to create a base64 string. If you just need a base64 string, well you can directly create it from the original string
– Angelo Immediata
Jan 1 at 7:31
2
1. Don't use String.getBytes(), which uses your platform default encoding. Use String.getBytes(StandardCharsets.UTF_8), which uses UTF_8 and is thus guaranteed to work the same way everywhere and support any character. 2. Encode the result using Base64 or Hex encoding.
– JB Nizet
Jan 1 at 7:32
Some puristic remark: the result is a hash value, not an encrypted value. The latter somehow suggests that you could decrypt it.
– Henry
Jan 1 at 7:36