--- /dev/null
+//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 (void)
+{
+ /* 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 */
+
+
+
+
+
+ /* 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;
+
+ /* Initialise the library */
+ ERR_load_crypto_strings();
+ OpenSSL_add_all_algorithms();
+ OPENSSL_config(NULL);
+
+ int ss=0;
+ double time=0;
+ double t=TimeStart();
+
+
+ /* Encrypt the plaintext */
+
+
+ int i;
+
+ for(i=0;i<100;i++)
+ {
+ ciphertext_len = encrypt (plaintext, size, key, iv,
+ ciphertext);
+ ss+=ciphertext[100];
+ }
+
+ time+=TimeStop(t);
+
+ printf("Time encrypt %f ss %d\n",time,ss);
+
+
+ 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<100;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;
+}
