Encrypted Private Key
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Encrypted Private Key
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How to encrypt data using a private key in .NET.
Software Developer
WonderNet
I speak three languages: C#, Hebrew and English...
Programming is my work, my hobby and my second love.
I work for an Israeli company named "WonderNet" that deal with digital signature solutions,
combined with Biometrics hand written signature (on a Wacom tablet).
We develop web application as well as client desktop ones,
using the .NET framwork: ASP.NET, C#, SQL-Server and more.
Cry ...
I speak three languages: C#, Hebrew and English...
Programming is my work, my hobby and my second love.
I work for an Israeli company named "WonderNet" that deal with digital signature solutions,
combined with Biometrics hand written signature (on a Wacom tablet).
We develop web application as well as client desktop ones,
using the .NET framwork: ASP.NET, C#, SQL-Server and more.
Cryptography is my "thing" since I lay my hand on Simon Singh work of art "The Code Book".
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Sergio A.S. de Aguiar
ssaguiar@ssaguiar.com
Bad command or file name. Bad, bad command! Sit! Stay! Staaaay...
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TVMU^P[[IGIOQHG^JSH`A#@`RFJ\c^JPL>;"[,*/|+&WLEZGc`AFXc!L
%^]*IRXD#@GKCQ`R\^SF_WcHbORY87֦ʻ6ϣN8ȤBcRAV\Z^&SU~%CSWQ@#2
W_AD`EPABIKRDFVS)EVLQK)JKQUFK[M`UKs*$GwU#QDXBER@CBN%
R0~53%eYrd8mt^7Z6]iTF+(EWfJ9zaK-iTV.C\y
-----------------------------------------------
128 bit encrypted signature, crack if you can
Article Copyright 2009 by Dudi Bedner Everything else
Copyright © CodeProject , 1999-2021
Web01
2.8.20210406.1
The RSA (Rivest, Shamir, Adleman) encryption algorithm uses two Keys: Private and Public.
Suppose Alice wants to send a message to Bob (for his eyes only!). She can encrypt the message using the RSA algorithm with Bob's Public
Key, which is not a secret (that's why they call it Public…). Once the message is encrypted, nobody can decrypt it, except the one holding the matching Private Key (that is Bob).
The reverse is also true: if Alice would encrypt the message using her own Private Key , Bob (and Eve, and everyone who can access this "encrypted" message) can
decrypt it using Alice's Public Key. So, if everybody can decrypt it, what's the point in encrypting the message with a Private Key in the
first place? Well, there is a point if Bob wants to make sure that the message has been written by Alice and not by someone else (Eve?).
The .NET Framework implements the RSA algorithm in the RSACryptoServiceProvider class. The instance of this class lets you create Key pairs, encrypt
using a public key , decrypt using a private key (as in the first scenario), sign (sort of the second scenario, but not exactly), and verify the signature.
The Sign method accepts a message (as byte array) and creates a signature for this particular data. In the second scenario, Alice can write a message to Bob,
and use this method to get a signature with her own private key. Then, she can send the message to Bob as is (unencrypted) with the signature. To verify the writer ID (Alice), Bob
will use the Verify method with Alice's public key as: Verify(aliceMessage, aliceSignature) , and he will get " true " if this is the
original message written and signed by Alice, or " false " if even one bit has been changed since. This is one useful
implementation of private key encryption, but sometimes it's just too complicated. You might want to send just a little message so the
receiver can decrypt it and be sure it's from you, without the need to sign and send him both components.
Unfortunately, the RSACryptoServiceProvider class does not provide you this option, so I wrote my own implementation of the RSA algorithm using
the basics of the RSACryptoServiceProvider in conjunction with Chew Keong
TAN's class: BigInteger ( http://www.codeproject.com/KB/cs/biginteger.aspx ). At a low level,
the RSA algorithm is about implementing mathematical equations on huge (huge) integers, so the BigInteger class is really essential. I couldn't have done it myself.
I believe the method names are self explanatory. First, you have to create a private / public key pair, using the .NET RSACryptoServiceProvider class.
To do that, you just create an instance of this class and then call the appropriate methods, like this:
To help you get started with the RSAEncryption and the RSACryptoServiceProvider classes, I wrote a WinForms tester application that uses those classes.
All you need to do is just play with it a little and read the code-behind.
The new implementation of the RSA Private Encryption has a few advantages:
This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)
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Yeah, your work is simple and you seem to be smart. Got to play around with the demo program.
Can anybody help me with decrypting a signature created by OpenSSL? Here is the original question post - .net - How to decrypt data with public key - Stack Overflow . Continue looking for an answer I found this post but it didn't resolve my question, it gave a few hints what to look for. I feel that the answer is somewhere near. It looks like I need to add implementation of a standard algorithm to remove a padding added by OpenSSL but I don't know where to find it. I believe it should be something standard. If not, the signature created by OpenSSL could not be verified on other systems with other RSA implementations but verification itself work. In my case I need to actually extract the signed (original message/hash) data from the signature (encrypted with the private key message/hash).
Thank you
I like how this shows the heart of asymmetric encryption using BigInteger. I knew it was possible but hadn't been able to find an example of it.
Works perfect and exactly what I was looking for!
Hello,
it is no longer possible to use scenario A in the 2012 update? We can no longer encrypt with a public key and decrypt with a private key?
I'm looking for this feature.
Thank you very much for the job
I have reviewed the code and implemented. It works good. Thank you!
Hi, would you please provide the System.Numerics.dll you used to run this porject?>
Hello this article is awesome. learn lots of thing with this. here i have tested this with two different key means different public and private key of created. or created private key and other public key. so here in both cases i am successfully encrypt and decrypt.
Dudi, how to start winform application to encrypt file with your RSA?
Thank you very much Dudi Bedner for this tutorial. Really it helps me a lot in order to implement RSA algorithm.
Throws that exception while decoding, using default data on the example binary.
Perhaps doesn't work the same for all locations.
Very, very easy 5. Thank you for sharing.
Sorry I'm new in encryption and security
I need to publish some data which is not so sensitive but should not be easily readable or copy paste by others. I must have to publish it in simple text/xml file publicly so everyone can easily access it.
I want only my application can decrypt/read this xml file.
But the problem is file size will be increased periodically may be in few years xml file size reached 100 or more MBs.
If this occurs, Can this method handle this?
Or do you have any other security suggestion for me? Kindly share.
I have the Private key (from 'pem' file) as string.
But the method which im using accepts the parameter as 'Private key'
getSignaute(java.security.PrivateKey pk, string inputxml)
how to convert string to private key (in C#.net)
Last Visit: 31-Dec-99 18:00 Last Update: 6-Apr-21 21:48
encryption - Encrypt with private key and decrypt with... - Stack Overflow
RSA Private Key Encryption - CodeProject
PHP: openssl_ private _ encrypt - Manual
RSA (cryptosystem) - Wikipedia
Encrypt /Decrypt a File using your SSH Public/ Private Key on Mac OS X
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openssl_private_encrypt
( string $data
, string &$encrypted_data
, OpenSSLAsymmetricKey | OpenSSLCertificate | array | string $private_key
, int $padding = OPENSSL_PKCS1_PADDING
) : bool
Смотрите также ¶
openssl_public_encrypt() - Шифрование данных открытым ключом
openssl_public_decrypt() - Расшифровка данных с помощью открытого ключа
add a note
User Contributed Notes 5 notes
Just a little note on [P.Peyremorte]'s note. "- openssl_private_encrypt can encrypt a maximum of 117 chars at one time." This depends on the length of $key: - For a 1024 bit key length => max number of chars (bytes) to encrypt = 1024/8 - 11(when padding used) = 117 chars (bytes). - For a 2048 bit key length => max number of chars (bytes) to encrypt = 2048/8 - 11(when padding used) = 245 chars (bytes). ... and so on By the way, if openssl_private_encrypt fails because of data size you won't get anything but just false as returned value, the same for openssl_public_decrypt() on decryption. "- the encrypted output string is always 129 char length. If you use base64_encode on the encrypted output, it will give always 172 chars, with the last always "=" (filler)" This again depends on the length of $key: - For a 1024 bit key length => encrypted number of raw bytes is always a block of 128 bytes (1024 bits) by RSA design. - For a 2048 bit key length => encrypted number of raw bytes is always a block of 256 bytes (2048 bits) by RSA design. ... and so on About base64_encode output length, it depends on what you encode (meaning it depends on the bytes resulting after encryption), but in general the resulting encoded string will be about a 33% bigger (for 128 bytes bout 170 bytes and for 256 bytes about 340 bytes). I would then generalize a little [P.Peyremorte]'s note by: ENCRYPT_BLOCK_SIZE ); foreach( $plainData as $chunk ) { $partialEncrypted = '' ; //using for example OPENSSL_PKCS1_PADDING as padding $encryptionOk = openssl_private_encrypt ( $chunk , $partialEncrypted , $privatePEMKey , OPENSSL_PKCS1_PADDING ); if( $encryptionOk === false ){return false ;} //also you can return and error. If too big this will be false $encrypted .= $partialEncrypted ; } return base64_encode ( $encrypted ); //encoding the whole binary String as MIME base 64 } //For decryption we would use: protected function decrypt_RSA ( $publicPEMKey , $data ) { $decrypted = '' ; //decode must be done before spliting for getting the binary String $data = str_split ( base64_decode ( $data ), $this -> DECRYPT_BLOCK_SIZE ); foreach( $data as $chunk ) { $partial = '' ; //be sure to match padding $decryptionOK = openssl_public_decrypt ( $chunk , $partial , $publicPEMKey , OPENSSL_PKCS1_PADDING ); if( $decryptionOK === false ){return false ;} //here also processed errors in decryption. If too big this will be false $decrypted .= $partial ; } return $decrypted ; } ?>
Encrypt using private key, decrypt using public key.
Use this for posting signed messages: Anyone with access to
your public key can read it, but they can't create one with
your signature.
Here is a over simplified version of using the crypt capabilities for getting started: $res = openssl_pkey_new(); // Get private key openssl_pkey_export($res, $privkey); // Get public key $pubkey = openssl_pkey_get_details($res); $pubkey = $pubkey["key"]; var_dump($privkey); var_dump($pubkey); // get some text from command line to work with $tocrypt = trim(fgets(STDIN)); // some variables to work with $encryptedviaprivatekey = ""; //holds text encrypted with the private key $decryptedviapublickey = ""; // holds text which was decrypted by the public key after being encrypted with the private key, should be same as $tocrypt $encryptedviapublickey = ""; // holds text that was encrypted with the public key $decryptedviaprivatekey = ""; // holds text that was decrypted with the private key after being encrypted with the public key, should be the same as $tocrypt openssl_private_encrypt($tocrypt, $encryptedviaprivatekey, $privkey); echo $tocrypt . "->" . $encryptedviaprivatekey; echo "\n\n"; openssl_public_decrypt($encryptedviaprivatekey, $decryptedviapublickey, $pubkey); echo $encryptedviaprivatekey . "->" . $decryptedviapublickey; echo "\n\n"; openssl_public_encrypt($tocrypt,$encryptedviapublickey, $pubkey); echo $tocrypt . "->" . $encryptedviapublickey; echo "\n\n"; openssl_private_decrypt($encryptedviapublickey, $decryptedviaprivatekey, $privkey); echo $encryptedviapublickey . "->" . $decryptedviaprivatekey; Output: string(887) "-----BEGIN RSA PRIVATE KEY----- MIICXAIBAAKBgQCy745x8AqGKlTWBu2Ub80boPaQxo/midZ4LHZ0zbPpiCAfkADN VYSe8OckPKutdjPX7SNAx66PgQRH1xrz1gysbRrf8K/mA0LQ00MKBFaFottWt5cC IaUS9zvCgPw7prwng3hkGShnvTSMXiKFyt1E3RTvpXRk0u46D6hKiy+TSQIDAQAB AoGBAJe1jjNCDtoz19vi4doBdIhhT8vt3iHbafBX2lMr+MceeAXqpRNy10+e9op9 uh0G4+vGDialZnYbMBLs6Ngl+nVnzn+cN1MMJ18brgf3biZKzVzK9wmOW4eycWaR 9eLa7/+ns8Cw5GsLJdG+OHR2gXRXU4hzUFdf90UUbP+kuqK1AkEA2X04XznFDNmT NuhyCixwinlziazJBp/81jjaBhYj3cG0nTF0Gactc/yD0yudbrMqjLBfts+FbG3Z yFHKrAB/cwJBANKetll3M3aCGsermEK+9hbB8yMihCju6pAwClUNkrAgrm9zU4LP WkC81RDzXbz+pfIqpopfn34F3+U2iMiOe1MCQCXpTgpLZ631v1Oy8S4U0QlSYnF9 TQ16lfhBsL+e3GGrgnBkTniqS6IMQm5tC+RgFuqvU//p7LgZ7fydRVb2P0ECQFp9 YADuKskmutTAj6lVnCtI5upYgQmJJHQQf8/tBfHwCKHPnbic17zqpGwk80go7Ckw U98tmDuv0HMNTBVGygsCQALck7VNBRjL9iFzJMFis+alcP1ZC88wOLPvIxYbevUH c8rZwRqt1aHwaWOoxcVom+tyzRC6gEYoBarmU1bX4No= -----END RSA PRIVATE KEY----- " string(272) "-----BEGIN PUBLIC KEY----- MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCy745x8AqGKlTWBu2Ub80boPaQ xo/midZ4LHZ0zbPpiCAfkADNVYSe8OckPKutdjPX7SNAx66PgQRH1xrz1gysbRrf 8K/mA0LQ00MKBFaFottWt5cCIaUS9zvCgPw7prwng3hkGShnvTSMXiKFyt1E3RTv pXRk0u46D6hKiy+TSQIDAQAB -----END PUBLIC KEY----- " this is a test for crypting ( ¦E@n¥u?7Fëµ¥+-M¼ìk?7¥;t?8[j¼ñrƒ¦ª-TÜ++ßYG?-úö¦}9+k8OJn_?¦x?¦ dó+aév.cå?-ï`,¦?·5u¦p%Z²¤ÜI?û ¼ ( ¦E@n¥u?7Fëµ¥+-M¼ìk?7¥;t?8[j¼ñrƒ¦ª-TÜ++ßYG?-úö¦}9+k8OJn_?¦x?¦ dó+aév.cå?-ï`,¦?·5u¦p%Z²¤ÜI?û ¼->this is a test for crypting this is a test for crypting->hT!¡_ #+£-íßÿo»¢äSs+üSnäÖ-(¦ëIkl[¤¦=?í?Ç+Uy·N,=b=+¦TàmeNo¦A~ùÑtü¦@ÿ½»¦SV5Ѫ*¦?·UÿoPÖFq -? O{²¦á|,äIN)+_-öF+*¦{|??G-??£/?¬±"PFL hT!¡_ #+£-íßÿo»¢äSs+üSnäÖ-(¦ëIkl[¤¦=?í?Ç+Uy·N,=b=+¦TàmeNo¦A~ùÑtü¦@ÿ½»¦SV5Ѫ*¦?·UÿoPÖFq -? O{²¦á|,äIN)+_-öF+*¦{|??G-??£/?¬±"PFL->this is a test for crypting
CIAO !
A trick not mentioned in manual to know : - openssl_private_encrypt can encrypt a maximum of 117 chars at one time. - the encrypted output string is always 129 char length. If you use base64_encode on the encrypted output, it will give always 172 chars, with the last always "=" (filler). So, to encode a longer stream input you have to use something like : and then, to decode :
(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)
openssl_private_encrypt — Шифрует данные секретным ключом
openssl_private_encrypt() шифрует data
с помощью секретного ключа private_key и сохраняет результат
в encrypted_data . Потом данные можно расшифровать с помощью
openssl_public_decrypt() .
Эта функция используется, например, для подписи данных. Чтобы была уверенность
в том, кто именно отправил сообщение.
padding может быть одной из констант:
OPENSSL_PKCS1_PADDING ,
OPENSSL_NO_PADDING .
Возвращает true в случае успешного завершения или false в случае возникновения ошибки.
private_key теперь принимает экземпляр OpenSSLAsymmetricKey
или OpenSSLCertificate ;
ранее принимался ресурс ( resource ) типа OpenSSL key или OpenSSL X.509 .
