Java Snippet output is not equal to command line openssl command output , Why ?

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Java Snippet output is not equal to command line openssl command output , Why ?

tim.fortinbras
Hi,

Could some openssl expert please advise  ?

Trying to get the equivalent Openssl command-line version of the following java snippet.

I have tried this  openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt

But the  the results do not match ?

```
From: "tim.fortinbras" <[hidden email]>
To: [hidden email]
Cc: 
Bcc: 
Date: Tue, 31 Jul 2018 06:48:59 -0700 (MST)
Subject: Looking for exact openssl commands to do the following from command line ?
import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

public class SHA256RSA {

    public static void main(String[] args) throws Exception {
        String input = "sample input";

        // Not a real private key! Replace with your private key!
        String strPk = "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9"
                + "w0BAQEFAASCBKkwggSlAgEAAoIBAQDJUGqaRB11KjxQ\nKHDeG"
                + "........................................................"
                + "Ldt0hAPNl4QKYWCfJm\nNf7Afqaa/RZq0+y/36v83NGENQ==\n" 
                + "-----END PRIVATE KEY-----\n";

        String base64Signature = signSHA256RSA(input,strPk);
        System.out.println("Signature="+base64Signature);
    }

    // Create base64 encoded signature using SHA256/RSA.
    private static String signSHA256RSA(String input, String strPk) throws
Exception {
        // Remove markers and new line characters in private key
        String realPK = strPk.replaceAll("-----END PRIVATE KEY-----", "")
                             .replaceAll("-----BEGIN PRIVATE KEY-----", "")
                             .replaceAll("\n", "");

        byte[] b1 = Base64.getDecoder().decode(realPK);
        PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(b1);
        KeyFactory kf = KeyFactory.getInstance("RSA");

        Signature privateSignature = Signature.getInstance("SHA256withRSA");
        privateSignature.initSign(kf.generatePrivate(spec));
        privateSignature.update(input.getBytes("UTF-8"));
        byte[] s = privateSignature.sign();
        return Base64.getEncoder().encodeToString(s);
    }
}

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Re: Java Snippet output is not equal to command line openssl command output , Why ?

Viktor Dukhovni
On Wed, Aug 01, 2018 at 09:24:38AM +0100, timmy pony wrote:

> I have tried this
>
> openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt

This produces raw binary output, no base64 encoding.  What is the
content of the file "codeToSign.txt"?  Post the output of:

    od -tx1 < /tmp/codeToSign.txt

> public class SHA256RSA {
>
>     public static void main(String[] args) throws Exception {
>         String input = "sample input";

This input has no newline ending, perhaps the disk file does.

>         // Not a real private key! Replace with your private key!
>         String strPk = "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9"
>                 + "w0BAQEFAASCBKkwggSlAgEAAoIBAQDJUGqaRB11KjxQ\nKHDeG"
>                 + "........................................................"
>                 + "Ldt0hAPNl4QKYWCfJm\nNf7Afqaa/RZq0+y/36v83NGENQ==\n"
>                 + "-----END PRIVATE KEY-----\n";

I sure hope your production code will *NOT* have the private key
embedded in the executable.

>         String base64Signature = signSHA256RSA(input,strPk);
>         System.out.println("Signature="+base64Signature);

This outputs a signature encoded in base64.

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        Viktor.
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Re: Java Snippet output is not equal to command line openssl command output , Why ?

tim.fortinbras
Thanks Viktor,
for assistance .....
The embedded private key "skeleton" is only for visualisation purposes; No it will not.


the openssl command returns binary. 
so i can do .But they are still coming out different.

openssl base64 -in /tmp/sign.sha256 -out <signature>

On Wed, Aug 1, 2018 at 4:28 PM Viktor Dukhovni <[hidden email]> wrote:
On Wed, Aug 01, 2018 at 09:24:38AM +0100, timmy pony wrote:

> I have tried this
>
> openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt

This produces raw binary output, no base64 encoding.  What is the
content of the file "codeToSign.txt"?  Post the output of:

    od -tx1 < /tmp/codeToSign.txt

> public class SHA256RSA {
>
>     public static void main(String[] args) throws Exception {
>         String input = "sample input";

This input has no newline ending, perhaps the disk file does.

>         // Not a real private key! Replace with your private key!
>         String strPk = "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9"
>                 + "w0BAQEFAASCBKkwggSlAgEAAoIBAQDJUGqaRB11KjxQ\nKHDeG"
>                 + "........................................................"
>                 + "Ldt0hAPNl4QKYWCfJm\nNf7Afqaa/RZq0+y/36v83NGENQ==\n"
>                 + "-----END PRIVATE KEY-----\n";

I sure hope your production code will *NOT* have the private key
embedded in the executable.

>         String base64Signature = signSHA256RSA(input,strPk);
>         System.out.println("Signature="+base64Signature);

This outputs a signature encoded in base64.

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        Viktor.
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Re: Java Snippet output is not equal to command line openssl command output , Why ?

Viktor Dukhovni


> On Aug 1, 2018, at 12:14 PM, timmy pony <[hidden email]> wrote:
>
> Thanks Viktor,
> for assistance .....
> The embedded private key "skeleton" is only for visualisation purposes; No it will not.
>
>
> the openssl command returns binary.
> so i can do .But they are still coming out different.
>
> openssl base64 -in /tmp/sign.sha256 -out <signature>

Please re-read my previous post and respond to *all* the points.

--
        Viktor.

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Re: Java Snippet output is not equal to command line openssl command output , Why ?

Blumenthal, Uri - 0553 - MITLL
Actually, it all works just fine. Viktor's point about adding terminating "\n" to the input text helped.

-----BEGIN PRIVATE KEY-----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-----END PRIVATE KEY-----

-----BEGIN PUBLIC KEY-----
MIIBIDANBgkqhkiG9w0BAQEFAAOCAQ0AMIIBCAKCAQEAxpV35TAww/JDj0z+ctOr
Ul3tYPBt7iQKBh0/DXsGADSDjbiRGb3l53y/PmyUSLvBQ83gnOElrAiEiljJl/1W
PiM2cS71JTs0Wipjt0ruwPQAUnPwLXBFXK14a/ald2sWQzF0V7Fk8RZ4Tv5USvEa
XxqBiIYAipLjbMMvw1I5GtMdNx8pg+x8FoWjYLLr6J/s1pUjUyFd7f1lONPdw5cp
CoA8BD8pt1FxyIAHnBALGL5v2HmLTPDbBxdrc6+NHSsQOOtJTvz/Fa+6y3X/gBfb
DcnzRUfNSgbT6dmqr2VV2mx0KyGRKaGS65M+rgjm5sj4hcdpufWN510FdhWnPA7g
EwIBAw==
-----END PUBLIC KEY-----

$ cat rsa_tst1.java
import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

public class rsa_tst1
{

    public static void main(String[] args) throws Exception
    {
        String input = "sample input\n";

        final String strPk =
                "-----BEGIN PRIVATE KEY-----\n"
                + "MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQDGlXflMDDD8kOP\n"
                + "TP5y06tSXe1g8G3uJAoGHT8NewYANIONuJEZveXnfL8+bJRIu8FDzeCc4SWsCISK\n"
                + "WMmX/VY+IzZxLvUlOzRaKmO3Su7A9ABSc/AtcEVcrXhr9qV3axZDMXRXsWTxFnhO\n"
                + "/lRK8RpfGoGIhgCKkuNswy/DUjka0x03HymD7HwWhaNgsuvon+zWlSNTIV3t/WU4\n"
                + "093DlykKgDwEPym3UXHIgAecEAsYvm/YeYtM8NsHF2tzr40dKxA460lO/P8Vr7rL\n"
                + "df+AF9sNyfNFR81KBtPp2aqvZVXabHQrIZEpoZLrkz6uCObmyPiFx2m59Y3nXQV2\n"
                + "Fac8DuATAgEDAoIBAQCEY6VDdXXX9te03f73N8eMPp5AoElJbVwEE39eUgQAIwJe\n"
                + "ewtmfplE/dTUSGLbJ9YtM+sTQMPIBa2xkIZlU47UF3mgyfjDfM2RcZfPh0nV+AA2\n"
                + "9/VzoC49yPrypG5PnLmCIPg6dkNLZFA0qY2HS2bqEauwWVWxt0JIgh/XjCYR4OYZ\n"
                + "y7unFj5XnW93cAfL9U8CZPonO6iHCB14unk/UyiIHNrR41at0+qwVJYXdTFx+m0C\n"
                + "3KiWAwleRdVy2LBj3Fq1R3/pW3tnYTadgOInRYF4hQuF+ttIzEiuimhd6blUdMlR\n"
                + "WWbw8xp2A8buS4DQUKz0u1OAAhDvsqfEDsWLIAq7AoGBAPHwbdW8aLN85Y3W1pYf\n"
                + "2ELIlV1422sH+MrKv/jqQFf9LVmiXzq2+EZiYQcSxUFp5/1OvnRIHfY2hiBtq4Ww\n"
                + "VBq9/0u/D8Rv9bKPOvpLxYZP9FIOo8/BaLp5VV3Vz4pxVort0xHr+DfWFWH7t0cC\n"
                + "m/3LtfC1Y7j0TKyL/soyDWzXAoGBANIf/7pM4msWM+5WtEoW17OKaE6fbHYbeG44\n"
                + "/C76WhRBJ5onCuz7m0tdoB9mGv+D3s8FcBojzlbDKIrZvv7XDG1rAL2x5AGKqDZP\n"
                + "+bH5ahKJDg/tq7Sba6xqtLBMtzVqZrtDSGTUPLNkeDJM4F6rs/dK+HvEjruLhF1E\n"
                + "ALS5UWMlAoGBAKFK8+PS8HeomQk55GQVOtcwY5Ol55yv+zHcf/tG1Y/+HjvBlNHP\n"
                + "UC7sQK9h2NZGmqjfKaLavqQkWWrzx651jWcpVN0qCoL1TncKJ1GH2QQ1TYwJwoqA\n"
                + "8HxQ45Pj37Gg5FyejLadUCU5Y5anz4SsZ/6HzqB47SX4Mx2yqdwhXkiPAoGBAIwV\n"
                + "VSbd7EdkIp7keDFkj80G8DRqSE68+vQl/XSm5rgrb7waB0invNzpFWpEEf+tPzSu\n"
                + "SrwX3uSCGwc71KnksvOcqykhQquxxXmKpnamRrcGCV/zx8288nLxzcrdz3jxmdIs\n"
                + "2u3i0yJC+swzQD8dIqTcpafYXyeyWD4tVc3Q4OzDAoGBAML1gJ2slF0egQmxKSJK\n"
                + "YktcRX4IP1rWlYClgcJ9OLAxZBFWPwW8+hsTfCDoa5WEk4+CFHZ37PyibzjGuASC\n"
                + "UQmOZj6tVnaRkB62ExArgjzyyIMEUAbfFw4vKHe8cyF8MFC6JbTYj0EDlQtkhK65\n"
                + "HE0xeJjwo/swhpkBItsH0cYJ\n"
                + "-----END PRIVATE KEY-----\n";

        String base64Signature = signSHA256RSA(input,strPk);
        System.out.println("Signature:\n"+base64Signature);
    }

    // Create base64 encoded signature using SHA256/RSA.
    private static String signSHA256RSA(String input, String strPk)
    throws Exception
    {
        // Remove markers and new line characters in private key
        String realPK = strPk.replaceAll("-----END PRIVATE KEY-----", "")
                             .replaceAll("-----BEGIN PRIVATE KEY-----", "")
                             .replaceAll("\n", "");

        byte[] b1 = Base64.getDecoder().decode(realPK);
        PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(b1);
        KeyFactory kf = KeyFactory.getInstance("RSA");

        Signature privateSignature = Signature.getInstance("SHA256withRSA");
        privateSignature.initSign(kf.generatePrivate(spec));
        privateSignature.update(input.getBytes("UTF-8"));
        byte[] s = privateSignature.sign();
        return Base64.getEncoder().encodeToString(s);
    }
}

$ java rsa_tst1
Signature:
aM9GLnfy+yZ7g6PSpQ0+BEgQvNq0KwrKVeVUNtCNPnC7zOVd3wTp69xxcQfVCWY3MDGw0xVSs6P/Ud+do/NbFbw9ShdTfBi81hKe5rV8US//oF1RWa0uDdz6Pr5JCa+6E35oVZeoRC7i0UjJDLGx0PPpMshGQWtau8r7/Oaw2BywiIwvKWRp9zBMgQJRiO1rrCHqOEIegTGUCsRuzzk4XoFdDQEHJ8fydFV5/feIUQJCrC4HIIrwr8XPtEJrsJyssC6xmU5hkFKJhuovd/+9pfNEIVQnBFd03VCEdJWhuTf2IKabDGg8MGKMGsEkgFZpUQJijXMD7ifzLcQXzp7q7w==

Stored it in tsig.b64 file.

$ echo "sample input" > tt.txt
$ openssl base64 -in tsig.b64 -d -a -out tsig.sig
$ openssl dgst -sha256 -verify rsa2048-pub.pem -signature tsig.sig tt.txt
Verified OK

On 8/1/18, 12:17, "openssl-users on behalf of Viktor Dukhovni" <[hidden email] on behalf of [hidden email]> wrote:

   
   
    > On Aug 1, 2018, at 12:14 PM, timmy pony <[hidden email]> wrote:
    >
    > Thanks Viktor,
    > for assistance .....
    > The embedded private key "skeleton" is only for visualisation purposes; No it will not.
    >
    >
    > the openssl command returns binary.
    > so i can do .But they are still coming out different.
    >
    > openssl base64 -in /tmp/sign.sha256 -out <signature>
   
    Please re-read my previous post and respond to *all* the points.
   
    --
    Viktor.
   
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Re: Java Snippet output is not equal to command line openssl command output , Why ?

tim.fortinbras
In reply to this post by Viktor Dukhovni
Hi Vicktor,  Speed read the previous mail. 



On Wed, Aug 1, 2018 at 4:28 PM Viktor Dukhovni <[hidden email]> wrote:
On Wed, Aug 01, 2018 at 09:24:38AM +0100, timmy pony wrote:

> I have tried this
>
> openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt

This produces raw binary output, no base64 encoding.  What is the
content of the file "codeToSign.txt"?  Post the output of:

    od -tx1 < /tmp/codeToSign.txt

 od -tx1 < codeToSign.txt

0000000    73  61  6d  70  6c  65  20  69  6e  70  75  74  0a            

0000015

 

> public class SHA256RSA {
>
>     public static void main(String[] args) throws Exception {
>         String input = "sample input";

This input has no newline ending, perhaps the disk file does.

>         // Not a real private key! Replace with your private key!
>         String strPk = "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9"
>                 + "w0BAQEFAASCBKkwggSlAgEAAoIBAQDJUGqaRB11KjxQ\nKHDeG"
>                 + "........................................................"
>                 + "Ldt0hAPNl4QKYWCfJm\nNf7Afqaa/RZq0+y/36v83NGENQ==\n"
>                 + "-----END PRIVATE KEY-----\n";

I sure hope your production code will *NOT* have the private key
embedded in the executable.

>         String base64Signature = signSHA256RSA(input,strPk);
>         System.out.println("Signature="+base64Signature);

This outputs a signature encoded in base64.

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Re: Java Snippet output is not equal to command line openssl command output , Why ?

tim.fortinbras
Hi Vicktor - I put a '\n' at end of java snippet 

Both are now equal 

Thank you for your help.

On Wed, Aug 1, 2018 at 5:47 PM timmy pony <[hidden email]> wrote:
Hi Vicktor,  Speed read the previous mail. 



On Wed, Aug 1, 2018 at 4:28 PM Viktor Dukhovni <[hidden email]> wrote:
On Wed, Aug 01, 2018 at 09:24:38AM +0100, timmy pony wrote:

> I have tried this
>
> openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt

This produces raw binary output, no base64 encoding.  What is the
content of the file "codeToSign.txt"?  Post the output of:

    od -tx1 < /tmp/codeToSign.txt

 od -tx1 < codeToSign.txt

0000000    73  61  6d  70  6c  65  20  69  6e  70  75  74  0a            

0000015

 

> public class SHA256RSA {
>
>     public static void main(String[] args) throws Exception {
>         String input = "sample input";

This input has no newline ending, perhaps the disk file does.

>         // Not a real private key! Replace with your private key!
>         String strPk = "-----BEGIN PRIVATE KEY-----\nMIIEvwIBADANBgkqhkiG9"
>                 + "w0BAQEFAASCBKkwggSlAgEAAoIBAQDJUGqaRB11KjxQ\nKHDeG"
>                 + "........................................................"
>                 + "Ldt0hAPNl4QKYWCfJm\nNf7Afqaa/RZq0+y/36v83NGENQ==\n"
>                 + "-----END PRIVATE KEY-----\n";

I sure hope your production code will *NOT* have the private key
embedded in the executable.

>         String base64Signature = signSHA256RSA(input,strPk);
>         System.out.println("Signature="+base64Signature);

This outputs a signature encoded in base64.

--
        Viktor.
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Re: Java Snippet output is not equal to command line openssl command output , Why ?

Viktor Dukhovni
In reply to this post by tim.fortinbras


> On Aug 1, 2018, at 12:47 PM, timmy pony <[hidden email]> wrote:
>
> On Wed, Aug 1, 2018 at 4:28 PM Viktor Dukhovni <[hidden email]> wrote:
> On Wed, Aug 01, 2018 at 09:24:38AM +0100, timmy pony wrote:
>
> > I have tried this
> >
> > openssl dgst -sha256 -sign my_private.key -out /tmp/sign.sha256 codeTosign.txt
>
> This produces raw binary output, no base64 encoding.  What is the
> content of the file "codeToSign.txt"?  Post the output of:
>
>     od -tx1 < /tmp/codeToSign.txt
>
>  od -tx1 < codeToSign.txt
> 0000000    73  61  6d  70  6c  65  20  69  6e  70  75  74  0a            
> 0000015

As expected, the disk file has a newline ending (0x0a) after the
input string.

> > public class SHA256RSA {
> >
> >     public static void main(String[] args) throws Exception {
> >         String input = "sample input";
>
> This input has no newline ending, perhaps the disk file does.

The input string signed by the Java code does not.  The signatures
are therefore *expected* to be different.

Either include a newline in the Java string, or create an input
file with no newline ending.

--
        Viktor.

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