> From: owner-openssl-us...@openssl.org On Behalf Of mycompuser
> Sent: Wednesday, 21 August, 2013 01:35
> Thanks for the reply.
> I do have access to the server code but cannot change it's
> implementation to
> suite my requirement as the server is serving other clients in other
> platforms as
Hi Dave,
Thanks for the reply.
I do have access to the server code but cannot change it's implementation to
suite my requirement as the server is serving other clients in other
platforms as well.
Below is the java code to encrypt an AES symmetric key with the public key
it recieves from the clie
Hi,
Thanks for the reply.
"That's because it's not a raw public key; it's a base64 encoded
structure containing the key parts. It's a lot more than just stripping
the header and footer."
I was not aware of this.
But I think my requirement is to send the public key in Base64 encoded
structur
> From: owner-openssl-us...@openssl.org On Behalf Of Ken Goldman
> Sent: Tuesday, 20 August, 2013 08:08
> On 8/19/2013 3:15 PM, mycompuser wrote:
> > But the only
> > problem that I currently face is that the key pair
> generated by OpenSSL has
> > headers and footers of the form -BEGIN RSA P
On 8/19/2013 3:15 PM, mycompuser wrote:
But the only
problem that I currently face is that the key pair generated by OpenSSL has
headers and footers of the form -BEGIN RSA PUBLIC KEY- -END RSA
PUBLIC KEY- for public key likewise there is similar header and footer
for private key a
Hello Enrico,
Thanks for the code! It really helped.
Regards,
yamini.
--
View this message in context:
http://openssl.6102.n7.nabble.com/RSA-encryption-and-Decryption-code-in-C-language-tp45588p45759.html
Sent from the OpenSSL - User mailing list archive at Nabble.com.
___
You cannot generate a private key from a public key.
Typically, the receiver generates the key pair and sends the public key
to the sender. The sender encrypts with the public key. The receiver
decrypts with the private key.
A typical format for sending a public key across a channel is an X
Hello Michel,
Thanks for the link.
I have the following code.
int main()
{
RSA *key;
unsigned char input_ptext[] =
"58FD6F1C310FC9D0194FB8B0E99070A6CBA3473BFE69F953E60E99070A6CBA3473BFE69F953E0E99070A6CBA3473BFE69F953E0E99070A6CBAE";
unsigned char ctext[256];
unsigned char ptext[256];
Hi,
I'm implementing a software very similar to yours.
This is a small function that I used to generate private and public key:
#include
int main()
{
char * file_pem = "key_priv";
char * file_pem_pub = "key_pub";
FILE * fp;
int bits = 1024;
unsigned long exp = RSA_F4;
RS
On 18 June 2013 09:43, Michel wrote:
> Hi Yamini,
>
> I would suggest looking at the 'EVP Envelope' API :
> https://www.openssl.org/docs/crypto/EVP_SealInit.html
>
Also see:
http://wiki.openssl.org/index.php/EVP_Asymmetric_Encryption_and_Decryption_of_an_Envelope
Matt
__
Hi Yamini,
I would suggest looking at the 'EVP Envelope' API :
https://www.openssl.org/docs/crypto/EVP_SealInit.html
Le 17/06/2013 19:26, yamini a écrit :
Hello,
I am implementing the DES algorithm between my client and server systems for
encryption. The DES key is transmitted in encrypted fo
durgaprasad jammula, thank you for your help, I do think T2000 (sun sparc
machine) has the hardware accelerator for RSA encryption, but I also test
the performance on an amd64 machine (dell optiplex 745, a desktop pc), I
think there should not be hardware accelerator in the dell amd64 machine,
but
PKCS11 is interface to hardware cryptographic accelators. If you use PKCS11
engine, instead of software doing the encryption/decryption, hardware does it.
To use, PKCS11, you need to have cryptographic hardware accelator. This comes
by default with Sun Fire T2000.
If you encrypt the data with P
Hello,
> Actually this should be the private key. Not the public key.
>
> RSA_size(prvKey->pkey.rsa)
In general - yes, but size of private and public key must be the same
for RSA.
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
___
Yeah I rectified it . Sorry I forgot to have u guys posted... :)
Actually this should be the private key. Not the public key.
RSA_size(prvKey->pkey.rsa)
Really appreciate Ur help,
Kaushalye
Marek Marcola wrote:
Hello,
Change:
strlen((char*)encrypted)
to:
RSA_size(pubKey->pke
Hello,
Change:
strlen((char*)encrypted)
to:
RSA_size(pubKey->pkey.rsa)
Best regards,
--
Marek Marcola <[EMAIL PROTECTED]>
__
OpenSSL Project http://www.openssl.org
User Support Ma
Hi,
Yeah it helped. Thanks.
Then I wrote this code(attched) to encrypt and decrypt a text.
I generated the private key using
openssl genrsa -out rsakey2.pem 1024
And then the public key using
openssl rsa -in rsakey2.pem -pubout > rsapub2.pem
When I compile and run the test the encryption wo
Kaushalye Kapuruge wrote:
Hi,
I'm trying to encrypt a Text using a session key and then encrypt that
session key using the public key of the reciever side. Can anybody
point me to an example in C?
For this
1. I need to read the key using PEM format.
http://www.openssl.org/docs/crypto/pem.html
On Sat, Dec 24, 2005, Arsen Hayrapetyan wrote:
> When I am passing RSA_size(rsa) as the first argument to
> RSA_private_decrypt(), I
> am receiving the initial message decoded as "Test messageA". I have
> allocated the
> RSA_size(rsa) bytes for the buffer receiving the decodod text. Does the
> dec
Arsen Hayrapetyan wrote:
jimmy wrote:
Arsen Hayrapetyan wrote:
Hello,
I have the following question:
unsigned char *plaintext = "Test message";
unsigned char * ciphertext=NULL;
RSA *rsa =...; /*here I have an RSA key */
RSA_public_encrypt(strlen(plaintext), plaintext, ciphertext, rsa,
RSA
jimmy wrote:
> Arsen Hayrapetyan wrote:
>
>> Hello,
>>
>> I have the following question:
>>
>> unsigned char *plaintext = "Test message";
>> unsigned char * ciphertext=NULL;
>> RSA *rsa =...; /*here I have an RSA key */
>>
>> RSA_public_encrypt(strlen(plaintext), plaintext, ciphertext, rsa,
>> RS
The length of ciphertext is not longer than the public key's length.
If your public key is 1024bit, the length of ciphertext is 128 bytes.
2005/12/24, jimmy <[EMAIL PROTECTED]>:
> Arsen Hayrapetyan wrote:
> > Hello,
> >
> > I have the following question:
> >
> > unsigned char *plaintext = "Test me
Arsen Hayrapetyan wrote:
Hello,
I have the following question:
unsigned char *plaintext = "Test message";
unsigned char * ciphertext=NULL;
RSA *rsa =...; /*here I have an RSA key */
RSA_public_encrypt(strlen(plaintext), plaintext, ciphertext, rsa,
RSA_PKCS1_OAEP_PADDIN*G* );
What will be the
Sure,
take a look at http://www.openssl.org/docs/crypto/crypto.html.
Renember to link against libcrypto...
Sebastian
cranium2003 wrote:
hello,
I want to write a RSA encryption decryption
program in C that encrypt data on one pc sends that
encrypted data to other pc and get it decrypted on
th
Thank you :)Sebastian <[EMAIL PROTECTED]> wrote:
Hmm,take a look at routines like RSA_new() to create RSA structures. As you coded 'sizeof apub', this will return the size of a _pointer_ - assuming a 32-bit architecture you will get round about four bytes ;-).See: http://www.openssl.org/docs/crypto
Hmm,
take a look at routines like RSA_new() to create RSA structures. As you coded
'sizeof apub', this will return the size of a _pointer_ - assuming a 32-bit
architecture you will get round about four bytes ;-).
See: http://www.openssl.org/docs/crypto/RSA_new.html
The runtime error is caused b
Vishwas wrote:
Dear SSLites,
Please observe the following operations.
I do the following:-
key1 = RSA_generate_key(n, e1, NULL, NULL);
num = RSA_private_encrypt(plen, ptext_ex, ctext, key1, RSA_PKCS1_PADDING);
RSA_public_decrypt(num, ctext, ptext, key1, RSA_PKCS1_PADDING);
Average encryption time i
First of all, you need to write functions that do serialization and
de-serialization of your own C structure.
Think about network programming, how do you send a C structure using
sockets to a receipient? And having the receipient assemble it back into
a C structure?
Without such functions, any
Hi,
My structure has 3 unsigned char arrays and I will have to move this
encrypted data to other machines too.
Following is the structure:
typedef struct myStruct {
unsigned char id[4];
unsigned char type;
unsigned char Data[128]; } ;
Can you pleas
Charles B Cranston wrote:
Casting does not actually change the data, only the way in which
it is treated by the program.
Casting changes the way data are treated by the compiler.
There is no string type in C, the semantics of nul-terminated
strings are created in the behavior of certain functions.
_decrypt (sizeof (szEncrypted), szEncrypted, (unsigned
char *)&sStruct, &Rsa, RSA_PKCS1_PADDING);
}
I hope this helps.
Marc.
> -Message d'origine-
> De : Jayashree Kanchana [mailto:[EMAIL PROTECTED]
> Envoyé : mardi 3 août 2004 16:43
> À : [EMAIL PROTECTED]
>
One danger with casting a structure as a string is that zero bytes
(which can happen due to "slack bits" in the structure) might be
interpreted as an end-of-string that would prematurely terminate
the data.
If you're going to process binary data, look for an API where you
specify both a pointer and
Hi Marc,
I am sorry, I am not sure how I can type cast the structure to string,
should I do (char *) ?
Once I encrypt I am not sure if the encrypted string has the
same structure as the original "structure".
Can you please show me the synatx to type cast a structure to string.
Thanks,
Jayashree
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA1
Jayashree Kanchana wrote:
| Hi,
|
| I am hoping that someone might have come across this problem and will be
| able to help me.
|
| I am trying to use openssl to encrypt a "c structure" instead of just a
| "string", is there any function in openssl that
Maybe you could cast the contents of your structure to a string, encrypt this string
and then cast the string back to your structure type.
Marc.
> -Message d'origine-
> De : Jayashree Kanchana [mailto:[EMAIL PROTECTED]
> Envoyé : mardi 3 août 2004 16:00
> À : [EMAIL PROTECTED]
> Objet :
The maximum amount of data you can encrypt with a 1024 bit RSA key is
1024 bits of data = 128 bytes. I think PKCS1 padding adds at least 10
bytes before encoding (I might be off on this number?). You want to use
padding if you're concerned about the security of your data (pretty much
you wan
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