Blowfish implementation with OpenSSL

[derleader mail]

 
Hi,


 I'm working on implementation of OpenSSL and Blowfish. Can you help me to 
improve the code, Is there a problem in the code?


C code:


//cl test_AES.c /IC:\openssl\include /linkC:\openssl\lib\libeay32.lib

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



#include  

#include  


#include  
#include  

#include  




int main(void) {







 char plaintext[1024] = "Hello World? - this is a test of Blowfish! of which 
I'm curious to see if it really is working.\n";




 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));






 in_len = strlen(plaintext);






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


 //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);






 //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 *)plaintext, &out_len, 
(unsigned char *)ciphertext, in_len);




 tmp_len += out_len;




 EVP_DecryptFinal(&ctx, (unsigned char *)&plaintext[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", plaintext);






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






 return 0;

}