Re: Problem to cipher/decypher a struct with RSA

[Nils Larsch]

Angel Martinez Gonzalez wrote:
Hello:
I want to cypher/decypher an struct:
struct PeticionSeudonimo
 {
  char *mensaje;
  int id_peticion;
  DES_cblock *clave_simetrica;
 }peticion_seudonimo;
To do this, I first convert this struct to char *:
 char *ptrPeticionSeudonimo = (char *)peticion_seudonimo;
Then I use this function to cipher:
char *CifradoClavePublica(RSA *claveRSA, char *texto)
{
 char *textocifrado;
 textocifrado =malloc(RSA_size(claveRSA));
 RSA_public_encrypt(strlen(texto)+1, texto, textocifrado, claveRSA,
I wouldn't use strlen(), sizeof() might be more appropriate
Nils
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Re: Problem to cipher/decypher a struct with RSA

[Angel Martinez Gonzalez]

Hello:

Thanks Nils for you help, but I obtain the problem. I have tried your
advice:
RSA_public_encrypt(sizeof(texto)+1, texto, textocifrado, claveRSA,
RSA_PKCS1_PADDING);

but the problem is the same.

- Original Message - 
From: Nils Larsch [EMAIL PROTECTED]
To: openssl-users@openssl.org
Sent: Thursday, May 12, 2005 9:51 AM
Subject: Re: Problem to cipher/decypher a struct with RSA


 Angel Martinez Gonzalez wrote:
  Hello:
 
  I want to cypher/decypher an struct:
 
  struct PeticionSeudonimo
   {
char *mensaje;
int id_peticion;
DES_cblock *clave_simetrica;
   }peticion_seudonimo;
 
  To do this, I first convert this struct to char *:
 
   char *ptrPeticionSeudonimo = (char *)peticion_seudonimo;
 
  Then I use this function to cipher:
 
  char *CifradoClavePublica(RSA *claveRSA, char *texto)
  {
   char *textocifrado;
 
   textocifrado =malloc(RSA_size(claveRSA));
   RSA_public_encrypt(strlen(texto)+1, texto, textocifrado, claveRSA,

 I wouldn't use strlen(), sizeof() might be more appropriate

 Nils
 __
 OpenSSL Project http://www.openssl.org
 User Support Mailing Listopenssl-users@openssl.org
 Automated List Manager   [EMAIL PROTECTED]

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Re: Problem to cipher/decypher a struct with RSA

[Gyorgy Camaszotisz]

I'm afraid sizeof(texto) returns the size of the pointer itself (4 in case of 
IA-32), not the data length. sizeof(struct PeticionSeudonimo) would be more 
effective.
Also, you are using pointers in your struct (like char *mensaje), which means 
you are ciphering the pointer only, not the data it is pointing to.

HTH,
Gyorgy

 [EMAIL PROTECTED] 5/11/2005 10:07:28 
Hello:

Thanks Nils for you help, but I obtain the problem. I have tried your
advice:
RSA_public_encrypt(sizeof(texto)+1, texto, textocifrado, claveRSA,
RSA_PKCS1_PADDING);

but the problem is the same.

- Original Message - 
From: Nils Larsch [EMAIL PROTECTED]
To: openssl-users@openssl.org
Sent: Thursday, May 12, 2005 9:51 AM
Subject: Re: Problem to cipher/decypher a struct with RSA


 Angel Martinez Gonzalez wrote:
  Hello:
 
  I want to cypher/decypher an struct:
 
  struct PeticionSeudonimo
   {
char *mensaje;
int id_peticion;
DES_cblock *clave_simetrica;
   }peticion_seudonimo;
 
  To do this, I first convert this struct to char *:
 
   char *ptrPeticionSeudonimo = (char *)peticion_seudonimo;
 
  Then I use this function to cipher:
 
  char *CifradoClavePublica(RSA *claveRSA, char *texto)
  {
   char *textocifrado;
 
   textocifrado =malloc(RSA_size(claveRSA));
   RSA_public_encrypt(strlen(texto)+1, texto, textocifrado, claveRSA,

 I wouldn't use strlen(), sizeof() might be more appropriate

 Nils
 __
 OpenSSL Project http://www.openssl.org 
 User Support Mailing Listopenssl-users@openssl.org 
 Automated List Manager   [EMAIL PROTECTED] 

__
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User Support Mailing Listopenssl-users@openssl.org 
Automated List Manager   [EMAIL PROTECTED]

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Problem to cipher/decypher a struct with RSA

[Angel Martinez Gonzalez]

Hello:

I want to cypher/decypher an struct:

struct PeticionSeudonimo
 {
  char *mensaje;
  int id_peticion;
  DES_cblock *clave_simetrica;
 }peticion_seudonimo;

To do this, I first convert this struct to char *:

 char *ptrPeticionSeudonimo = (char *)peticion_seudonimo;

Then I use this function to cipher:

char *CifradoClavePublica(RSA *claveRSA, char *texto)
{
 char *textocifrado;

 textocifrado =malloc(RSA_size(claveRSA));
 RSA_public_encrypt(strlen(texto)+1, texto, textocifrado, claveRSA,
RSA_PKCS1_PADDING);

 return (textocifrado);
}

and I call this function at this way:
solicitudCifrada = CifradoClavePublica(clavePublicaRSA_TTP,
ptrPeticionSeudonimo);

Then, I decipher (solicitudCifrada) using this function:

char *DescifradoClavePrivada(RSA *claveRSA, char *texto)
{
 char *textoclaro;

 textoclaro = malloc(RSA_size(claveRSA));
 RSA_private_decrypt(RSA_size(claveRSA), texto, textoclaro, claveRSA,
RSA_PKCS1_PADDING);

 return (textoclaro);
}

and I call this function at this way:
solicitudDescifrada = DescifradoClavePrivada(clavePrivadaRSA_TTP,
solicitudCifrada);

Finally, I convert solicitudDescifrada from char * to struct:
peticion_seudonimo_descifrada = (struct PeticionSeudonimo
*)solicitudDescifrada;

But, when I want to show the fields of this struct
peticion_seudonimo_descifrada, I only obtain the first field (char
*mensaje), the others fileds are missing. I obtain an error at execution
time. This fields are disappear.

What is wrong?.

Thanks for your help.

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