Mixing
Different result Encrypt C# Java
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When I try to convert code form Java to C#, i have a big problem with EncryptFunction.
I have this code in Java:
private String KEY_PRIVATE_HP = "__hpcSecretKey__";
private IvParameterSpec getIvParameterSpec() {
byte empty = new byte[16];
return new IvParameterSpec(empty);
}
private String encryptBin(String value) {
SecretKeySpec secretKeySpec = new SecretKeySpec(KEY_PRIVATE_HP.getBytes("UTF-8"),"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, getIvParameterSpec());
byte encrypted = cipher.doFinal(value.getBytes());
return Base64.encodeToString(encrypted, Base64.NO_WRAP);
}
And i converted it to C# like that:
static string KEY_PRIVATE_HP = "__hpcSecretKey__";
public static string encryptBin(string value)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
byte pwdBytes = Encoding.UTF8.GetBytes(KEY_PRIVATE_HP);
byte keyBytes = new byte[0x10];
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte plainText = Encoding.UTF8.GetBytes(value);
return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));
}
But when i debug in C# and Java together, it have different result.
What's wrong?
java c# encryption
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
add a comment |
0
When I try to convert code form Java to C#, i have a big problem with EncryptFunction.
I have this code in Java:
private String KEY_PRIVATE_HP = "__hpcSecretKey__";
private IvParameterSpec getIvParameterSpec() {
byte empty = new byte[16];
return new IvParameterSpec(empty);
}
private String encryptBin(String value) {
SecretKeySpec secretKeySpec = new SecretKeySpec(KEY_PRIVATE_HP.getBytes("UTF-8"),"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, getIvParameterSpec());
byte encrypted = cipher.doFinal(value.getBytes());
return Base64.encodeToString(encrypted, Base64.NO_WRAP);
}
And i converted it to C# like that:
static string KEY_PRIVATE_HP = "__hpcSecretKey__";
public static string encryptBin(string value)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
byte pwdBytes = Encoding.UTF8.GetBytes(KEY_PRIVATE_HP);
byte keyBytes = new byte[0x10];
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte plainText = Encoding.UTF8.GetBytes(value);
return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));
}
But when i debug in C# and Java together, it have different result.
What's wrong?
java c# encryption
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
1
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
3
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
1
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31
add a comment |
0
0
0
When I try to convert code form Java to C#, i have a big problem with EncryptFunction.
I have this code in Java:
private String KEY_PRIVATE_HP = "__hpcSecretKey__";
private IvParameterSpec getIvParameterSpec() {
byte empty = new byte[16];
return new IvParameterSpec(empty);
}
private String encryptBin(String value) {
SecretKeySpec secretKeySpec = new SecretKeySpec(KEY_PRIVATE_HP.getBytes("UTF-8"),"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, getIvParameterSpec());
byte encrypted = cipher.doFinal(value.getBytes());
return Base64.encodeToString(encrypted, Base64.NO_WRAP);
}
And i converted it to C# like that:
static string KEY_PRIVATE_HP = "__hpcSecretKey__";
public static string encryptBin(string value)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
byte pwdBytes = Encoding.UTF8.GetBytes(KEY_PRIVATE_HP);
byte keyBytes = new byte[0x10];
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte plainText = Encoding.UTF8.GetBytes(value);
return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));
}
But when i debug in C# and Java together, it have different result.
What's wrong?
java c# encryption
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
When I try to convert code form Java to C#, i have a big problem with EncryptFunction.
I have this code in Java:
private String KEY_PRIVATE_HP = "__hpcSecretKey__";
private IvParameterSpec getIvParameterSpec() {
byte empty = new byte[16];
return new IvParameterSpec(empty);
}
private String encryptBin(String value) {
SecretKeySpec secretKeySpec = new SecretKeySpec(KEY_PRIVATE_HP.getBytes("UTF-8"),"AES");
Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
cipher.init(Cipher.ENCRYPT_MODE, secretKeySpec, getIvParameterSpec());
byte encrypted = cipher.doFinal(value.getBytes());
return Base64.encodeToString(encrypted, Base64.NO_WRAP);
}
And i converted it to C# like that:
static string KEY_PRIVATE_HP = "__hpcSecretKey__";
public static string encryptBin(string value)
{
RijndaelManaged rijndaelCipher = new RijndaelManaged();
rijndaelCipher.Mode = CipherMode.CBC;
rijndaelCipher.Padding = PaddingMode.PKCS7;
rijndaelCipher.KeySize = 0x80;
rijndaelCipher.BlockSize = 0x80;
byte pwdBytes = Encoding.UTF8.GetBytes(KEY_PRIVATE_HP);
byte keyBytes = new byte[0x10];
int len = pwdBytes.Length;
if (len > keyBytes.Length)
{
len = keyBytes.Length;
}
Array.Copy(pwdBytes, keyBytes, len);
rijndaelCipher.Key = keyBytes;
rijndaelCipher.IV = keyBytes;
ICryptoTransform transform = rijndaelCipher.CreateEncryptor();
byte plainText = Encoding.UTF8.GetBytes(value);
return Convert.ToBase64String(transform.TransformFinalBlock(plainText, 0, plainText.Length));
}
But when i debug in C# and Java together, it have different result.
What's wrong?
java c# encryption
java c# encryption
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
asked Jan 3 at 12:01
Trần Nhật TrườngTrần Nhật Trường
82
82
1
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
3
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
1
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31
add a comment |
1
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
3
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
1
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31
1
1
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
3
3
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
1
1
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31
add a comment |
1 Answer
1
active
oldest
votes
3
In one code you are using an all zero byte IV, in the other you copy the key bytes.
Both are insecure, for CBC mode the IV should be unpredictable; usually secure random values are used and prefixed to the ciphertext.
You may want to have a look at authenticated ciphers such as GCM. Using CBC between two programs for transport security is insecure.
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.new byte[0x00]creates a zero length (or empty) byte array. Note that you can use back-ticks`code`to indicate inline code.
– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,new byte[16]possibly? C# arrays are initialized to zero.
– Maarten Bodewes
Jan 7 at 8:47
add a comment |
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1 Answer
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3
In one code you are using an all zero byte IV, in the other you copy the key bytes.
Both are insecure, for CBC mode the IV should be unpredictable; usually secure random values are used and prefixed to the ciphertext.
You may want to have a look at authenticated ciphers such as GCM. Using CBC between two programs for transport security is insecure.
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.new byte[0x00]creates a zero length (or empty) byte array. Note that you can use back-ticks`code`to indicate inline code.
– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,new byte[16]possibly? C# arrays are initialized to zero.
– Maarten Bodewes
Jan 7 at 8:47
add a comment |
3
In one code you are using an all zero byte IV, in the other you copy the key bytes.
Both are insecure, for CBC mode the IV should be unpredictable; usually secure random values are used and prefixed to the ciphertext.
You may want to have a look at authenticated ciphers such as GCM. Using CBC between two programs for transport security is insecure.
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.new byte[0x00]creates a zero length (or empty) byte array. Note that you can use back-ticks`code`to indicate inline code.
– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,new byte[16]possibly? C# arrays are initialized to zero.
– Maarten Bodewes
Jan 7 at 8:47
add a comment |
3
3
3
In one code you are using an all zero byte IV, in the other you copy the key bytes.
Both are insecure, for CBC mode the IV should be unpredictable; usually secure random values are used and prefixed to the ciphertext.
You may want to have a look at authenticated ciphers such as GCM. Using CBC between two programs for transport security is insecure.
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
In one code you are using an all zero byte IV, in the other you copy the key bytes.
Both are insecure, for CBC mode the IV should be unpredictable; usually secure random values are used and prefixed to the ciphertext.
You may want to have a look at authenticated ciphers such as GCM. Using CBC between two programs for transport security is insecure.
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
answered Jan 3 at 12:07
Maarten BodewesMaarten Bodewes
63.6k1185178
63.6k1185178
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.new byte[0x00]creates a zero length (or empty) byte array. Note that you can use back-ticks`code`to indicate inline code.
– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,new byte[16]possibly? C# arrays are initialized to zero.
– Maarten Bodewes
Jan 7 at 8:47
add a comment |
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.new byte[0x00]creates a zero length (or empty) byte array. Note that you can use back-ticks`code`to indicate inline code.
– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,new byte[16]possibly? C# arrays are initialized to zero.
– Maarten Bodewes
Jan 7 at 8:47
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
I want to change code in C#, i try to set rijndaelCipher.IV = new byte[0x00] but it go to Exception: Specified initialization vector (IV) does not match the block size for this algorithm. How can i fix?
– Trần Nhật Trường
Jan 3 at 12:16
You need 16 bytes (the block size in bytes) of zeros.
new byte[0x00] creates a zero length (or empty) byte array. Note that you can use back-ticks `code` to indicate inline code.– Maarten Bodewes
Jan 3 at 12:17
You need 16 bytes (the block size in bytes) of zeros.
new byte[0x00] creates a zero length (or empty) byte array. Note that you can use back-ticks `code` to indicate inline code.– Maarten Bodewes
Jan 3 at 12:17
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
I'm not clearly, what exactly i will do? Because the first time i code with Encrypt
– Trần Nhật Trường
Jan 3 at 12:24
Well,
new byte[16] possibly? C# arrays are initialized to zero.– Maarten Bodewes
Jan 7 at 8:47
Well,
new byte[16] possibly? C# arrays are initialized to zero.– Maarten Bodewes
Jan 7 at 8:47
add a comment |
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1
You are using PKCS5 in Java and PKCS7 in C#.
– iakovos Gurulian
Jan 3 at 12:03
3
@iakovosGurulian Those are the same
– Maarten Bodewes
Jan 3 at 12:04
1
The IV is not set in JAVA.
– kelalaka
Jan 3 at 12:06
@kelalaka can i remove or set IV same with Java in C#?
– Trần Nhật Trường
Jan 3 at 12:27
Normally, as Maarten noted, the salt must be generated randomly and usually prepended to ciphertext. You can set but you have it manually. AFAIK, you are trying to C# to Java and Java to C#. Better first try encrypted Java and Decrypt in C#, then v.s. So that, you can extract the prepended IV form the ciphertext.
– kelalaka
Jan 3 at 12:31