-//gcc pixmap_io.c -c
-//gcc openssl_evp_ebc.c pixmap_io.o -o openssl_evp_ebc -I /usr/include/openssl/ -lcrypto -O3 -std=c99
-
-
-#include <openssl/conf.h>
-#include <openssl/evp.h>
-#include <openssl/err.h>
-#include <openssl/ssl.h>
-#include <openssl/bio.h>
-#include <string.h>
-#include <sys/time.h>
-#include "pixmap_io.h"
-
-typedef unsigned char uchar;
-
-
-double TimeStart()
-{
- struct timeval tstart;
- gettimeofday(&tstart,0);
- return( (double) (tstart.tv_sec + tstart.tv_usec*1e-6) );
-}
-
-double TimeStop(double t)
-{
- struct timeval tend;
-
- gettimeofday(&tend,0);
- t = (double) (tend.tv_sec + tend.tv_usec*1e-6) - t;
- return (t);
-}
-
-
-void handleErrors(void)
-{
- ERR_print_errors_fp(stderr);
- abort();
-}
-
-
-int encrypt(unsigned char *plaintext, int plaintext_len, unsigned char *key,
- unsigned char *iv, unsigned char *ciphertext)
-{
- EVP_CIPHER_CTX *ctx;
-
- int len;
-
- int ciphertext_len;
-
- /* Create and initialise the context */
- if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();
-
- /* Initialise the encryption operation. IMPORTANT - ensure you use a key
- * and IV size appropriate for your cipher
- * In this example we are using 256 bit AES (i.e. a 256 bit key). The
- * IV size for *most* modes is the same as the block size. For AES this
- * is 128 bits */
-
- //256
- //avant ecb
- if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, key, iv))
- handleErrors();
-
-// int cipherBlockSize = EVP_CIPHER_CTX_block_size(ctx);
-// printf("INFO(evp_encrypt): block size: %d\n", cipherBlockSize);
-
-
- /* Provide the message to be encrypted, and obtain the encrypted output.
- * EVP_EncryptUpdate can be called multiple times if necessary
- */
-
- if(1 != EVP_EncryptUpdate(ctx, ciphertext, &len, plaintext, plaintext_len))
- handleErrors();
- ciphertext_len = len;
-
-
-
-
-
-
-
- /* Finalise the encryption. Further ciphertext bytes may be written at
- * this stage.
- */
- if(1 != EVP_EncryptFinal_ex(ctx, ciphertext + len, &len)) handleErrors();
- ciphertext_len += len;
-
- /* Clean up */
- EVP_CIPHER_CTX_free(ctx);
-
- return ciphertext_len;
-}
-
-int decrypt(unsigned char *ciphertext, int ciphertext_len, unsigned char *key,
- unsigned char *iv, unsigned char *plaintext)
-{
- EVP_CIPHER_CTX *ctx;
-
- int len;
-
- int plaintext_len;
-
- /* Create and initialise the context */
- if(!(ctx = EVP_CIPHER_CTX_new())) handleErrors();
-
- /* Initialise the decryption operation. IMPORTANT - ensure you use a key
- * and IV size appropriate for your cipher
- * In this example we are using 256 bit AES (i.e. a 256 bit key). The
- * IV size for *most* modes is the same as the block size. For AES this
- * is 128 bits */
-
- //256
-
- //avant => ecb
- if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_128_ecb(), NULL, key, iv))
- handleErrors();
-
- /* Provide the message to be decrypted, and obtain the plaintext output.
- * EVP_DecryptUpdate can be called multiple times if necessary
- */
-
-
- if(1 != EVP_DecryptUpdate(ctx, plaintext, &len, ciphertext, ciphertext_len))
- handleErrors();
- plaintext_len = len;
-
- /* Finalise the decryption. Further plaintext bytes may be written at
- * this stage.
- */
- if(1 != EVP_DecryptFinal_ex(ctx, plaintext + len, &len)) handleErrors();
- plaintext_len += len;
-
- /* Clean up */
- EVP_CIPHER_CTX_free(ctx);
-
- return plaintext_len;
-}
-
-
-int main (int argc, char** argv)
-{
- /* Set up the key and iv. Do I need to say to not hard code these in a
- * real application? :-)
- */
-
- /* A 256 bit key */
-// unsigned char *key = (unsigned char *)"01234567890123456789012345678901";
- unsigned char *key = (unsigned char *)"0123456789012345";
-
- /* A 128 bit IV */
- unsigned char *iv = (unsigned char *)"0123456789012345";
-
- /* Message to be encrypted */
-
- int nb_test=1;
- if(argc==2)
- nb_test=atoi(argv[1]);
- if(nb_test<=0 || nb_test>10000) {
- printf("nb tests is not correct\n");
- exit(0);
- }
- else
- printf("nb tests = %d\n\n",nb_test);
-
-
-
- /* Buffer for ciphertext. Ensure the buffer is long enough for the
- * ciphertext which may be longer than the plaintext, dependant on the
- * algorithm and mode
- */
-
- int width;
- int height;
- uchar *data_R, *data_G, *data_B;
- load_RGB_pixmap("lena.ppm", &width, &height, &data_R, &data_G, &data_B);
-
-
-// load_RGB_pixmap("No_ecb_mode_picture.ppm", &width, &height, &data_R, &data_G, &data_B);
-// load_RGB_pixmap("4096.ppm", &width, &height, &data_R, &data_G, &data_B);
- int size=width*height*3;
-
- int oneD=width*height;
- uchar *plaintext = malloc(size);
-
-
- for(int i=0;i<oneD;i++) {
- plaintext[i]=data_R[i];
- plaintext[oneD+i]=data_G[i];
- plaintext[2*oneD+i]=data_B[i];
- }
-
-
-
- uchar *ciphertext = malloc(size);
-
- /* Buffer for the decrypted text */
- uchar *decryptedtext = malloc(size);
-
- int decryptedtext_len, ciphertext_len;
-
-
- int ss=0;
- double time=0;
- double t=TimeStart();
-
-
- /* Encrypt the plaintext */
-
-
- int i;
-
- for(i=0;i<nb_test;i++)
- {
- ciphertext_len = encrypt (plaintext, size, key, iv,
- ciphertext);
- }
-
- time+=TimeStop(t);
-
- printf("Time encrypt %f \n",time);
-
-
- for(int i=0;i<oneD;i++) {
- data_R[i]=ciphertext[i];
- data_G[i]=ciphertext[oneD+i];
- data_B[i]=ciphertext[2*oneD+i];
- }
- store_RGB_pixmap("lena2.ppm", data_R, data_G, data_B, width, height);
-
-
- time=0;
- t=0;
- t=TimeStart();
-
- for(int i=0;i<nb_test;i++)
- {
- /* Decrypt the ciphertext */
- decryptedtext_len = decrypt(ciphertext, ciphertext_len, key, iv,
- decryptedtext);
- }
-
- time+=TimeStop(t);
-
- printf("Time decrypt %f\n",time);
-
-
- for(int i=0;i<oneD;i++) {
- data_R[i]=decryptedtext[i];
- data_G[i]=decryptedtext[oneD+i];
- data_B[i]=decryptedtext[2*oneD+i];
- }
- store_RGB_pixmap("lena3.ppm", data_R, data_G, data_B, width, height);
-
-
-
- /* Clean up */
- EVP_cleanup();
- ERR_free_strings();
-
- return 0;
-}
