+//gcc pixmap_io.c -c
+//gcc openssl_evp.c pixmap_io.o -o openssl_evp -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 <openssl/cmac.h>
+#include <openssl/hmac.h>
+#include <string.h>
+#include <sys/time.h>
+#include "pixmap_io.h"
+
+typedef unsigned char uchar;
+
+int nb_test=1;
+int ctr=0;
+
+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 printBytes(unsigned char *buf, size_t len) {
+ for(int i=0; i<len; i++) {
+ printf("%02x ", buf[i]);
+ }
+ printf("\n");
+}
+
+
+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, int ctr, int index)
+{
+
+ HMAC_CTX *ctx;
+
+
+ int len;
+
+ int ciphertext_len;
+ // ENGINE_load_builtin_engines();
+ //ENGINE_register_all_complete();
+
+
+ /* Create and initialise the context */
+ if(!(ctx = HMAC_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 */
+ //static double time=0;
+ //double t=0;
+ //t=TimeStart();
+ //256
+ //avant ecb
+ if(1 != HMAC_Init_ex(ctx, key, 32, EVP_sha256(), NULL))
+ handleErrors();
+ // size_t mactlen;
+ //unsigned char mact[16] = {0};
+
+ unsigned char* result;
+ unsigned int result_len = 32;
+
+
+ unsigned char hash_sha256[SHA256_DIGEST_LENGTH];
+ char hash_sha256_hex[SHA256_DIGEST_LENGTH * 2 + 1];
+
+ memset( hash_sha256_hex, 0, SHA256_DIGEST_LENGTH * 2 + 1);
+
+ //time+=TimeStop(t);
+ //printf("Time init %f\n",time);
+
+
+// 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
+ */
+
+/*
+ static double time=0;
+ double t=0;
+ t=TimeStart();
+*/
+ for(int i=0;i<nb_test;i++)
+ {
+
+ if(1 != HMAC_Update(ctx, plaintext, plaintext_len))
+ handleErrors();
+ ciphertext_len = len;
+
+ }
+/* time+=TimeStop(t);
+ // if(index==nb_test-1)
+ printf("Time encrypt %f\n",time);
+
+*/
+
+
+ /* Finalise the encryption. Further ciphertext bytes may be written at
+ * this stage.
+ */
+ if(1 != HMAC_Final(ctx, hash_sha256, &result_len)) handleErrors();
+
+
+ ciphertext_len += len;
+
+ printBytes(hash_sha256, result_len);
+
+ /*
+ char *p = &hash_sha256_hex[0];
+ unsigned char *h = &hash_sha256[0];
+ for (int i = 0; i < result_len; ++i, ++h)
+ {
+ p += snprintf(p, 3, "%02x", *h);
+ }
+
+ printf("SHA256\t: %s\n", hash_sha256_hex);
+ */
+
+ /* Clean up */
+ HMAC_CTX_free(ctx);
+
+ return ciphertext_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? :-)
+ */
+
+ int size_buf=1;
+ int lena=0;
+ int change=0;
+
+ for(int i=1; i<argc; i++){
+ if(strncmp(argv[i],"nb",2)==0) nb_test = atoi(&(argv[i][2])); //nb of test
+ if(strncmp(argv[i],"ctr",3)==0) ctr = atoi(&(argv[i][3])); //CTR ? 1 otherwise CBC like
+ if(strncmp(argv[i],"sizebuf",7)==0) size_buf = atoi(&(argv[i][7])); //SIZE of the buffer
+ if(strncmp(argv[i],"lena",4)==0) lena = atoi(&(argv[i][4])); //Use Lena or buffer
+ if(strncmp(argv[i],"c",1)==0) change = atoi(&(argv[i][1])); //Use Lena or buffer
+ }
+
+/* printf("nb times %d\n",nb_test);
+ printf("ctr %d\n",ctr);
+ printf("lena %d\n",lena);
+ printf("size_buf %d\n",size_buf);
+*/
+
+
+
+
+ /* 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 */
+
+ /* 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;
+ int imsize;
+ uchar *buffer;
+
+
+ if(lena==1) {
+ load_RGB_pixmap("lena.ppm", &width, &height, &data_R, &data_G, &data_B);
+ imsize=width*height*3;
+// load_RGB_pixmap("No_ecb_mode_picture.ppm", &width, &height, &data_R, &data_G, &data_B);
+ }
+ else {
+ width=size_buf;
+ height=size_buf;
+ imsize=width*height;
+ buffer=malloc(imsize*sizeof(uchar));
+ for(int i=0;i<imsize;i++) {
+ buffer[i]=lrand48();
+ }
+ }
+
+
+
+ int oneD=width*height;
+ uchar *plaintext = malloc(imsize+1000); //add that for cbc
+ if(lena) {
+ 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];
+ }
+ }
+ else
+ {
+ for(int i=0;i<oneD;i++) {
+ plaintext[i]=buffer[i];
+ }
+ }
+
+ if(change==1) {
+
+ plaintext[4]++;
+ }
+ if(change==2) {
+
+ plaintext[9]++;
+ }
+
+
+ uchar *ciphertext = malloc(imsize+1000); //add that for cbc
+
+ /* Buffer for the decrypted text */
+ uchar *decryptedtext = malloc(imsize+1000); //add that for cbc
+
+ int decryptedtext_len, ciphertext_len;
+
+ /* Initialise the library */
+/* ERR_load_crypto_strings();
+ OpenSSL_add_all_algorithms();
+ OPENSSL_config(NULL);
+*/
+
+
+ double time_encrypt=0;
+ double time_decrypt=0;
+ double t=TimeStart();
+
+
+ /* Encrypt the plaintext */
+
+
+ int i;
+
+// for(i=0;i<nb_test;i++)
+ {
+ ciphertext_len = encrypt (plaintext, imsize, key, iv,
+ ciphertext, ctr, i );
+ }
+
+ time_encrypt+=TimeStop(t);
+
+// printf("Time encrypt %f\n",time);
+ printf("%e\t",(double)imsize*nb_test/time_encrypt);
+
+ /*
+ if(lena) {
+ 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);
+ }
+ */
+/*
+ t=0;
+ t=TimeStart();
+
+ //for(int i=0;i<nb_test;i++)
+ {
+ // Decrypt the ciphertext
+ decryptedtext_len = decrypt(ciphertext, ciphertext_len, key, iv,
+ decryptedtext,ctr, i);
+ }
+
+ time_decrypt+=TimeStop(t);
+
+ //printf("Time decrypt %f\n",time);
+ printf("%f\t",(double)imsize*nb_test/time_decrypt);
+
+ if(lena) {
+ 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);
+ }
+ else {
+ int equal=1;
+ for(int i=0;i<imsize;i++) {
+ //cout<<(int)buffer[i]<<endl;
+ if(buffer[i]!=decryptedtext[i]) {
+ equal=0;
+ }
+ }
+// printf("RESULT CORRECT: %d\n",equal);
+ }
+*/
+
+ /* Clean up */
+ EVP_cleanup();
+ ERR_free_strings();
+
+ return 0;
+}
