Cannot encrypt text - need help

[derleader mail]

 
Hi,


 I'm trying to code a C program that can convert very big number of characters. 
The problem is that there is an error in decryption.

This is the code:

//gcc test_Blowfish.c -L/usr/local/ssl/lib/ -lssl -lcrypto -Wall



#include  

#include  


#include  

#include  

#include  




int main(void) {







 char plaintext[1024] = "{aaX{aaX57 : {223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa57 : 
{223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa{aaX57 
: {223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa";



 char plaintextz[1024];




 char ciphertext[1024]= {0,};




 char mykey[EVP_MAX_KEY_LENGTH] = "blowfish_key";




 char iv[EVP_MAX_IV_LENGTH] = "blowfish";




 int tmp_len = 0, in_len, out_len=0;




 EVP_CIPHER_CTX ctx;






 //memset(mykey,0,sizeof(mykey));




 //memset(iv,0,sizeof(iv));














 printf("No encrypt: %s\n", plaintext);


 



 printf("No encrypt size: %d\n", strlen(plaintext));






 //Encrypt




 EVP_EncryptInit(&ctx, EVP_bf_cfb(), (unsigned char *)mykey, (unsigned char 
*)iv);




 EVP_EncryptUpdate(&ctx, (unsigned char *)ciphertext, &out_len, 
(unsigned char *)plaintext, strlen(plaintext));


 //Block through the mem to be encrypted




 tmp_len += out_len;




 EVP_EncryptFinal(&ctx, (unsigned char *) &ciphertext[out_len], 
&out_len); //Finish any remaining encryption and throw a pad on




 tmp_len += out_len;




 printf("Encrypted: %s\n", ciphertext);



 printf("Encrypted size: %d\n", tmp_len);





 //Reset memory for Decryption

//


 memset(plaintext,0,sizeof(plaintext));




 in_len = tmp_len;




 out_len = tmp_len = 0;






 //decrypt




 EVP_DecryptInit(&ctx, EVP_bf_cfb(), (unsigned char *)mykey, (unsigned char 
*)iv);




 EVP_DecryptUpdate(&ctx, (unsigned char *)plaintextz, &out_len, 
(unsigned char *)ciphertext, strlen(ciphertext));




 tmp_len += out_len;




 EVP_DecryptFinal(&ctx, (unsigned char *)&plaintextz[out_len], 
&out_len);




 tmp_len += out_len;






 //Zero out the pad




 memset(&plaintext[tmp_len],0,(int)(sizeof(plaintext)) - tmp_len);






 printf("Decrypted : %s\n", plaintextz);




 printf("Decrypted size: %d\n", tmp_len);





 printf("Block Size: %d\n",EVP_CIPHER_CTX_block_size(&ctx));






 return 0;

} 



This is the output:

[root@localhost test]# ./a.out 
No encrypt: {aaX{aaX57 : {223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa57 : 
{223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa{aaX57 
: {223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa
No encrypt size: 267
Encrypted: 
�A-��W=?:�$�i�_�8:�F�wo#�5�@D�mo��-I���F�Q�J�#��F�0b�;�`�C䦱�~6�)ހ�YG�ed�Ӕ�Z%�9!mdvϋ���\���QB��}�N����@_�W�F�e"�
Encrypted size: 267
Decrypted : {aaX{aaX57 : {223 : 
2323}}{}{}{}{}{}{3535:42424}242424242242424243r23r23r23r23r23r23r3r{}pppa57 : 
{223 : 2323}}{}{}{}{}{}{3535:4242
Decrypted size: 131
Block Size: 1

As youy see the decrypted size number is less that the original.
Any idea where is the problem?