From ddce9b2d44ab48fc566870c5155b39c8fc06f24d Mon Sep 17 00:00:00 2001
From: Benedict <benedict@0xb8000.de>
Date: Tue, 21 Feb 2017 12:52:02 +0100
Subject: moved files of set1 into subdir

---
 set1/task7.c | 86 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 86 insertions(+)
 create mode 100644 set1/task7.c

(limited to 'set1/task7.c')

diff --git a/set1/task7.c b/set1/task7.c
new file mode 100644
index 0000000..d71da7a
--- /dev/null
+++ b/set1/task7.c
@@ -0,0 +1,86 @@
+#include <openssl/conf.h>
+#include <openssl/evp.h>
+#include <openssl/bio.h>
+#include <openssl/err.h>
+
+int handleErrors() 
+{
+	ERR_print_errors_fp(stderr);
+	abort();
+}
+
+int do_crypt(FILE *in, FILE *out, int do_encrypt)
+{
+	unsigned char inbuf[1024], outbuf[1024 + EVP_MAX_BLOCK_LENGTH];
+	int inlen, outlen;
+	EVP_CIPHER_CTX *ctx;
+
+	unsigned char key[] = "YELLOW SUBMARINE";
+
+	ctx = EVP_CIPHER_CTX_new();
+
+	EVP_CipherInit_ex(ctx, EVP_aes_128_ecb(), NULL, NULL, NULL, do_encrypt);
+
+	EVP_CipherInit_ex(ctx, NULL, NULL, key, NULL, do_encrypt);
+
+	for(;;) {
+		inlen = fread(inbuf, 1, 1024, in);
+		if (inlen <= 0)
+			break;
+
+		if(!EVP_CipherUpdate(ctx, outbuf, &outlen, inbuf, inlen)) {
+			EVP_CIPHER_CTX_free(ctx);
+			return 0;
+		}
+
+		fwrite(outbuf, 1, outlen, out);
+	}
+
+	if(!EVP_CipherFinal_ex(ctx, outbuf, &outlen)) {
+		EVP_CIPHER_CTX_free(ctx);
+		return 0;
+	}
+
+	fwrite(outbuf, 1, outlen, out);
+
+	EVP_CIPHER_CTX_free(ctx);
+	return 1;
+}
+
+int main(int argc, char **argv)
+{
+	ERR_load_crypto_strings();
+
+	OpenSSL_add_all_algorithms();
+
+	OPENSSL_config(NULL);
+
+
+	FILE *in;
+	FILE *out;
+
+	in = fopen("7unbased.txt", "r");
+	out = fopen ("7cleartext.txt", "w");
+
+	if ( in == NULL) {
+		printf("error in\n");
+		return 1;
+	}
+
+	if (out == NULL) {
+		printf("error out\n");
+		return 1;
+	}
+
+	do_crypt(in, out, 0);
+
+
+	EVP_cleanup();
+
+	CRYPTO_cleanup_all_ex_data();
+
+	ERR_free_strings();
+
+	return 0;
+}
+
-- 
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