diff --git a/Makefile b/Makefile
index 4684ff59..ec0a9a50 100644
--- a/Makefile
+++ b/Makefile
@@ -130,10 +130,12 @@ DES_SRC =						ft_des_initial_permutation.c 				\
 								ft_des_init_ctx.c 							\
 								ft_des_print_error.c 						\
 								ft_des_arg_parsers.c 						\
-								ft_des_ecb_process.c 						\
-								ft_des_ecb_process_chunk.c 					\
+								ft_des_ecb_encrypt.c 						\
+								ft_des_ecb_decrypt.c 						\
+								ft_des_ecb_encode_process_chunk.c 			\
 								ft_des_hex_to_bit_key.c 					\
-								ft_des_ecb_finish_process.c
+								ft_des_ecb_finish_encrypt.c
+								# ft_des_ecb_finish_decrypt.c
 
 SRC =							main.c										\
 								ft_ssl_usage.c
diff --git a/inc/ft_des.h b/inc/ft_des.h
index 84f3dbea..eb5970fb 100644
--- a/inc/ft_des.h
+++ b/inc/ft_des.h
@@ -14,6 +14,7 @@
 # define FT_DES_H
 
 # include <stdint.h>
+# include "ft_base64.h"
 
 # define FT_DES_BYTE_BLOCK_SIZE 8
 # define FT_DES_BIT_BLOCK_SIZE 64
@@ -38,12 +39,16 @@ typedef	struct						s_des_ctx
 	int								input_fd;
 	int								output_fd;
 	int								decode;
+	int								b64;
 	int								output_in_base64;
 	int								readed;
 	t_byte1							buffer[FT_DES_BYTE_BLOCK_SIZE];
 	t_byte1							key[FT_DES_INITIAL_KEY_SIZE];
 	t_byte1							round_keys[FT_DES_ROUND_COUNT]
 									[FT_DES_ROUND_KEY_SIZE];
+	t_base64_ctx					b64_ctx;
+	t_base64_encode_buffer			b64_encode_buffer;
+	t_base64_decode_buffer			b64_decode_buffer;
 }									t_des_ctx;
 
 typedef int (*t_ft_des_arg_parser_function)
@@ -299,19 +304,24 @@ int									ft_des_salt_arg_parser
 	t_des_ctx *c
 );
 
-void								ft_des_ecb_process
+void								ft_des_ecb_decrypt
 (
 	t_des_ctx *ctx
 );
 
-void								ft_des_ecb_process_chunk
+void								ft_des_ecb_encrypt
+(
+	t_des_ctx *ctx
+);
+
+void								ft_des_ecb_encode_process_chunk
 (
 	t_des_ctx *ctx,
 	t_byte8 reaed,
 	t_byte1 buffer[FT_DES_READ_SIZE]
 );
 
-void								ft_des_ecb_finish_process
+void								ft_des_ecb_finish_encrypt
 (
 	t_des_ctx *ctx
 );
diff --git a/src/des/ft_des_arg_parsers.c b/src/des/ft_des_arg_parsers.c
index ecf952a3..ae3ed30a 100644
--- a/src/des/ft_des_arg_parsers.c
+++ b/src/des/ft_des_arg_parsers.c
@@ -1,6 +1,21 @@
 #include "ft_des.h"
 #include <stddef.h>
 
+int	ft_des_base64_arg_parser
+(
+	int argc,
+	char **argv,
+	int position,
+	t_des_ctx *ctx
+)
+{
+	(void)argc;
+	(void)argv;
+	ctx->b64 = 1;
+	return (++position);
+}
+
+
 int	ft_des_key_arg_parser
 (
 	int argc,
@@ -17,4 +32,18 @@ int	ft_des_key_arg_parser
 	if (wrong_key_char != NULL)
 		ft_des_print_error("there wrong char in key string.");
 	return (position + 2);
+}
+
+int ft_des_decode_arg_parser
+(
+	int argc,
+	char **argv,
+	int position,
+	t_des_ctx *ctx
+)
+{
+	(void)argc;
+	(void)argv;
+	ctx->decode = 1;
+	return (++position);
 }
\ No newline at end of file
diff --git a/src/des/ft_des_ecb.c b/src/des/ft_des_ecb.c
index 88a37262..5c17e70c 100644
--- a/src/des/ft_des_ecb.c
+++ b/src/des/ft_des_ecb.c
@@ -6,6 +6,14 @@ t_des_argument_parser	g_arg_parsers[] = {
 		"-k",
 		ft_des_key_arg_parser,
 	},
+	{
+		"-d",
+		ft_des_decode_arg_parser,
+	},
+	{
+		"-a",
+		ft_des_base64_arg_parser,
+	},
 	{ NULL, NULL},
 };
 
@@ -49,6 +57,15 @@ void		ft_des_ecb
 
 	ft_des_init_ctx(&ctx);
 	parse_args(argc, argv, &ctx);
-	ft_des_ecb_process(&ctx);
+	if (ctx.decode)
+	{
+		ft_des_generate_decryption_round_keys(ctx.key, ctx.round_keys);
+		ft_des_ecb_decrypt(&ctx);
+	}
+	else
+	{
+		ft_des_generate_encryption_round_keys(ctx.key, ctx.round_keys);
+		ft_des_ecb_encrypt(&ctx);
+	}
 	exit(0);
 }
\ No newline at end of file
diff --git a/src/des/ft_des_ecb_decrypt.c b/src/des/ft_des_ecb_decrypt.c
new file mode 100644
index 00000000..ad3bdc94
--- /dev/null
+++ b/src/des/ft_des_ecb_decrypt.c
@@ -0,0 +1,80 @@
+#include <unistd.h>
+#include "ft_des.h"
+#include "libft.h"
+
+static t_byte8 buffered_read
+(
+	t_des_ctx *ctx,
+	t_byte1 buffer[FT_DES_BYTE_BLOCK_SIZE]
+)
+{
+	t_byte8 total_readed;
+	t_byte8 current_read;
+
+	total_readed = 0;
+	current_read = 0;
+	while(total_readed < FT_DES_BYTE_BLOCK_SIZE)
+	{
+		if ((current_read = read(
+			ctx->input_fd,
+			buffer + total_readed,
+			FT_DES_BYTE_BLOCK_SIZE - total_readed)) == 0)
+			return (total_readed + current_read);
+		total_readed += current_read;
+	}
+	return (total_readed);
+}
+
+static void	ouput
+(
+	t_des_ctx *ctx,
+	t_byte1 buffer[FT_DES_BYTE_BLOCK_SIZE]
+)
+{
+	if (ctx->b64)
+		ft_base64_decode_chunk(
+			&ctx->b64_ctx,
+			FT_DES_BYTE_BLOCK_SIZE, buffer, &ctx->b64_decode_buffer);
+	else
+		write(ctx->output_fd, buffer, FT_DES_BYTE_BLOCK_SIZE);
+}
+
+static void	finish
+(
+	t_des_ctx *ctx,
+	t_byte1 buffer[FT_DES_BYTE_BLOCK_SIZE]
+)
+{
+	if (ctx->b64)
+	{
+	}
+	else
+	{
+		if (buffer[7] < 0 || buffer[7] > 8)
+			ft_des_print_error("wrong padding");
+		write(ctx->output_fd, buffer, FT_DES_BYTE_BLOCK_SIZE - buffer[7]);
+	}
+}
+
+void		ft_des_ecb_decrypt
+(
+	t_des_ctx *c
+)
+{
+	t_byte8 readed;
+	t_byte8 last_read;
+	t_byte1 buffer[FT_DES_BYTE_BLOCK_SIZE];
+	t_byte1 message[FT_DES_BYTE_BLOCK_SIZE];
+
+	last_read = 0;
+	while((readed = buffered_read(c, buffer)))
+	{
+		if (readed != FT_DES_BYTE_BLOCK_SIZE)
+			ft_des_print_error("wrong message size");
+		if (last_read)
+			ouput(c, message);
+		ft_des_process_block(buffer, c->round_keys, message);
+		last_read = readed;
+	}
+	finish(c, message);
+}
\ No newline at end of file
diff --git a/src/des/ft_des_ecb_process_chunk.c b/src/des/ft_des_ecb_encode_process_chunk.c
similarity index 80%
rename from src/des/ft_des_ecb_process_chunk.c
rename to src/des/ft_des_ecb_encode_process_chunk.c
index f24a2f21..1d8d799a 100644
--- a/src/des/ft_des_ecb_process_chunk.c
+++ b/src/des/ft_des_ecb_encode_process_chunk.c
@@ -10,10 +10,18 @@ static void	ft_des_ecb_write
 {
 	t_byte1 cyphertext[FT_DES_BYTE_BLOCK_SIZE];
 	ft_des_process_block(buffer, ctx->round_keys, cyphertext);
-	write(ctx->output_fd, cyphertext, FT_DES_BYTE_BLOCK_SIZE);
+	if (ctx->b64)
+		ft_base64_encode_chunk(
+			&ctx->b64_ctx,
+			FT_DES_BYTE_BLOCK_SIZE,
+			cyphertext,
+			&ctx->b64_encode_buffer
+		);
+	else
+		write(ctx->output_fd, cyphertext, FT_DES_BYTE_BLOCK_SIZE);
 }
 
-void	ft_des_ecb_process_chunk
+void	ft_des_ecb_encode_process_chunk
 (
 	t_des_ctx *ctx,
 	t_byte8 readed,
diff --git a/src/des/ft_des_ecb_encrypt.c b/src/des/ft_des_ecb_encrypt.c
new file mode 100644
index 00000000..d7df0b3c
--- /dev/null
+++ b/src/des/ft_des_ecb_encrypt.c
@@ -0,0 +1,16 @@
+#include <unistd.h>
+#include "ft_des.h"
+#include "ft_base64.h"
+
+void	ft_des_ecb_encrypt
+(
+	t_des_ctx *ctx
+)
+{
+	t_byte1					buffer[FT_DES_READ_SIZE];
+	t_byte8					readed;
+
+	while((readed = read(ctx->input_fd, buffer, FT_DES_READ_SIZE)) > 0)
+		ft_des_ecb_encode_process_chunk(ctx, readed, buffer);
+	ft_des_ecb_finish_encrypt(ctx);
+}
\ No newline at end of file
diff --git a/src/des/ft_des_ecb_finish_decrypt.c b/src/des/ft_des_ecb_finish_decrypt.c
new file mode 100644
index 00000000..4d13c797
--- /dev/null
+++ b/src/des/ft_des_ecb_finish_decrypt.c
@@ -0,0 +1,16 @@
+#include "ft_des.h"
+
+void	ft_des_ecb_finish_decrypt
+(
+	t_des_ctx *ctx,
+	t_des_decrypt_buffer *buff
+)
+{
+	t_byte1 idx;
+
+	idx = 0;
+	ctx->readed += buff->readed[buff->current_buffer];
+	if (ctx->readed % FT_DES_BYTE_BLOCK_SIZE != 0)
+		ft_des_print_error("wrong message size, maybe corrupted?");
+	while (idx + FT_DES_BYTE_BLOCK_SIZE <=)
+}
\ No newline at end of file
diff --git a/src/des/ft_des_ecb_finish_process.c b/src/des/ft_des_ecb_finish_encrypt.c
similarity index 59%
rename from src/des/ft_des_ecb_finish_process.c
rename to src/des/ft_des_ecb_finish_encrypt.c
index 8b2134f1..33ad6dd7 100644
--- a/src/des/ft_des_ecb_finish_process.c
+++ b/src/des/ft_des_ecb_finish_encrypt.c
@@ -1,7 +1,7 @@
 #include "ft_des.h"
 #include <unistd.h>
 
-void	ft_des_ecb_finish_process
+void	ft_des_ecb_finish_encrypt
 (
 	t_des_ctx *ctx
 )
@@ -19,5 +19,14 @@ void	ft_des_ecb_finish_process
 		buffer_index++;
 	}
 	ft_des_process_block(ctx->buffer, ctx->round_keys, cyphertext);
-	write(ctx->output_fd, cyphertext, FT_DES_BYTE_BLOCK_SIZE);
+	if (ctx->b64)
+	{
+		ft_base64_encode_chunk(&ctx->b64_ctx, FT_DES_BYTE_BLOCK_SIZE,
+			cyphertext,
+			&ctx->b64_encode_buffer
+		);
+		ft_base64_encode_finish(&ctx->b64_ctx, &ctx->b64_encode_buffer);
+	}
+	else
+		write(ctx->output_fd, cyphertext, FT_DES_BYTE_BLOCK_SIZE);
 }
\ No newline at end of file
diff --git a/src/des/ft_des_ecb_process.c b/src/des/ft_des_ecb_process.c
deleted file mode 100644
index c3a1e25d..00000000
--- a/src/des/ft_des_ecb_process.c
+++ /dev/null
@@ -1,16 +0,0 @@
-#include <unistd.h>
-#include "ft_des.h"
-
-void	ft_des_ecb_process
-(
-	t_des_ctx *ctx
-)
-{
-	t_byte1	buffer[FT_DES_READ_SIZE];
-	t_byte8	readed;
-
-	ft_des_generate_encryption_round_keys(ctx->key, ctx->round_keys);
-	while((readed = read(ctx->input_fd, buffer, FT_DES_READ_SIZE)) > 0)
-		ft_des_ecb_process_chunk(ctx, readed, buffer);
-	ft_des_ecb_finish_process(ctx);
-}
\ No newline at end of file
diff --git a/src/des/ft_des_init_ctx.c b/src/des/ft_des_init_ctx.c
index 35ce1546..896fc9e9 100644
--- a/src/des/ft_des_init_ctx.c
+++ b/src/des/ft_des_init_ctx.c
@@ -19,7 +19,11 @@ void	ft_des_init_ctx
 	ft_bzero(ctx->buffer, FT_DES_BYTE_BLOCK_SIZE);
 	ctx->readed = 0;
 	ctx->decode = 0;
+	ctx->b64 = 0;
 	ctx->output_in_base64 = 0;
 	ctx->input_fd = STDIN_FILENO;
 	ctx->output_fd = STDOUT_FILENO;
+	ft_base64_init(&ctx->b64_ctx);
+	ft_base64_init_encode_buffer(&ctx->b64_encode_buffer);
+	ft_base64_init_decode_buffer(&ctx->b64_decode_buffer);
 }
\ No newline at end of file
diff --git a/src/des/ft_des_print_error.c b/src/des/ft_des_print_error.c
index d48aeb70..8796b3fc 100644
--- a/src/des/ft_des_print_error.c
+++ b/src/des/ft_des_print_error.c
@@ -1,3 +1,4 @@
+#include <unistd.h>
 #include "ft_des.h"
 #include "libft.h"
 
@@ -6,8 +7,8 @@ void	ft_des_print_error
 	const char *error
 )
 {
-	ft_putstr("des: ");
-	ft_putstr(error);
-	ft_putstr("\n");
+	ft_putstr_fd("des: ", STDERR_FILENO);
+	ft_putstr_fd(error, STDERR_FILENO);
+	ft_putstr_fd("\n", STDERR_FILENO);
 	exit(1);
 }
\ No newline at end of file
diff --git a/t/cases/foo_bar.txt b/t/cases/foo_bar.txt
new file mode 100644
index 00000000..d675fa44
--- /dev/null
+++ b/t/cases/foo_bar.txt
@@ -0,0 +1 @@
+foo bar
diff --git a/t/cases/foo_bar_enc.txt b/t/cases/foo_bar_enc.txt
new file mode 100644
index 00000000..1663167f
--- /dev/null
+++ b/t/cases/foo_bar_enc.txt
@@ -0,0 +1 @@
+a‘w@¦šmu0ÄØ7¡¸L
\ No newline at end of file