added hybrid encrypt function

week6/programmingExercises/making faster/test_decrypt/C2

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week6/programmingExercises/making faster/test_decrypt/IV

+j
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week6/programmingExercises/making faster/test_decrypt/hybrid_test_decrypt.c

@@ -27,7 +27,7 @@ int main(int argc, char *argv[]) {
     	exit(1);
     }
 
-    encrypt(argv[4],argv[1], argv[3]);
+    // encrypt(argv[4],argv[1], argv[3]);
     hybrid_decrypt(argv[2], "decrypted_message.txt");
     
     printf("output : %d\n",compare_files("message.txt","decrypted_message.txt"));

week6/programmingExercises/making faster/test_encrypt/C1

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week6/programmingExercises/making faster/test_encrypt/C2

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week6/programmingExercises/making faster/test_encrypt/IV

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week6/programmingExercises/making faster/test_encrypt/hybrid_test_encrypt.c

@@ -16,7 +16,6 @@ int padding = RSA_PKCS1_OAEP_PADDING;
 RSA * createRSAWithFilename(char * filename,int public)
 {
     FILE * fp = fopen(filename,"rb");
- 
     if(fp == NULL)
     {
         printf("Unable to open file %s \n",filename);
@@ -44,27 +43,138 @@ RSA * createRSAWithFilename(char * filename,int public)
 // 	/* your code goes here */
 //     return result;
 // }
+void handleErrors(void)
+{
+    ERR_print_errors_fp(stderr);
+    abort();
+}
+int encryptAES(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
+     */
+    if(1 != EVP_EncryptInit_ex(ctx, EVP_aes_256_cbc(), NULL, key, iv))
+        handleErrors();
+
+    /*
+     * 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 decryptAES(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
+     */
+    if(1 != EVP_DecryptInit_ex(ctx, EVP_aes_256_cbc(), 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;
+}
 
 void hybrid_encrypt(char * symmetric_key_file, char* message_file, char* public_key_file) {
-    puts("in hybrid file");
     int  result = 0;
-    RSA *rsa = createRSAWithFilename(public_key_file,0);
-    char symmKey[2048]; 
-    char encKey[2048]; 
+    RSA *rsa = createRSAWithFilename(public_key_file,1);
+    unsigned char * encKey = malloc(sizeof(RSA_size(rsa))); 
     FILE *fp = fopen(symmetric_key_file, "r");
-    puts("reading file");
     fseek(fp, 0, SEEK_END); 
-    size_t keyLen = ftell(fp); 
+    int keyLen = ftell(fp); 
     rewind(fp);
+    unsigned char* symmKey = malloc(sizeof(unsigned char)*keyLen + 1);
     fread(symmKey, keyLen, 1, fp);
-    puts(symmKey);
-    printf("%ld",keyLen);
-    puts("fread");
+    symmKey[keyLen]='\0';
     result = RSA_public_encrypt(keyLen,symmKey,encKey,rsa,padding);
-    puts("result");
-    puts(encKey);
-    puts("enckey");
+	/* Init vector */
+	unsigned char iv[AES_BLOCK_SIZE];
+    for(int i = 0; i<AES_BLOCK_SIZE;i++)
+        iv[i] = rand();
+    fp = fopen(message_file, "r");
+    puts("reading file");
+    fseek(fp, 0, SEEK_END); 
+    int msgLen = ftell(fp); 
+    rewind(fp);
+    unsigned char* aes_input = malloc(sizeof(unsigned char)*msgLen + 1);
+    unsigned char* enc_out = malloc(sizeof(unsigned char)*msgLen*128 + 1);
 
+    fread(aes_input, msgLen, 1, fp);
+    int ciphertext_len = encryptAES (aes_input, strlen ((char *)aes_input), symmKey, iv,
+                              enc_out);
+    enc_out[ciphertext_len]='\0';
+    FILE *C1 = fopen("C1","w");
+    FILE *C2 = fopen("C2","w");
+    FILE *IV = fopen("IV","w");
+    fprintf(C1,"%s",enc_out);
+    fprintf(C2,"%s",encKey);
+    fprintf(IV,"%s",iv);
+    fclose(C1);
+    fclose(C2);
+    fclose(IV);
+    fclose(fp);
 }
 
 int main(int argc, char *argv[]) {

week6/programmingExercises/making faster/test_encrypt/output

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