From 22d720e00ccde2f420c13930f83e206efb9ec60c Mon Sep 17 00:00:00 2001
From: Sascha Schumann <sas@php.net>
Date: Sun, 25 Apr 1999 21:11:29 +0000
Subject: [PATCH] add OFB mode, the final one

---
 ext/mcrypt/mcrypt.c     | 50 +++++++++++++++++++++++++++++++++++++++++
 ext/mcrypt/php_mcrypt.h |  1 +
 2 files changed, 51 insertions(+)

diff --git a/ext/mcrypt/mcrypt.c b/ext/mcrypt/mcrypt.c
index 87e6271606..989d43542f 100644
--- a/ext/mcrypt/mcrypt.c
+++ b/ext/mcrypt/mcrypt.c
@@ -41,6 +41,7 @@ function_entry mcrypt_functions[] = {
 	PHP_FE(mcrypt_ecb, NULL)
 	PHP_FE(mcrypt_cbc, NULL)
 	PHP_FE(mcrypt_cfb, NULL)
+	PHP_FE(mcrypt_ofb, NULL)
 	PHP_FE(mcrypt_get_block_size, NULL)
 	PHP_FE(mcrypt_get_key_size, NULL)
 	PHP_FE(mcrypt_create_iv, NULL)
@@ -180,6 +181,55 @@ PHP_FUNCTION(mcrypt_get_block_size)
 	RETURN_LONG(get_block_size(cipher->value.lval));
 }
 
+/* proto mcrypt_ofb(int cipher, string key, string data, int mode, string iv)
+   OFB crypt/decrypt data using key key with cipher cipher starting with iv */
+PHP_FUNCTION(mcrypt_ofb)
+{
+	pval *cipher, *data, *key, *mode, *iv;
+	int td;
+	char *ndata;
+	size_t bsize;
+	size_t nr;
+	size_t nsize;
+
+	if(ARG_COUNT(ht) != 5 || 
+			getParameters(ht, 5, &cipher, &key, &data, &mode, &iv) == FAILURE) {
+		WRONG_PARAM_COUNT;
+	}
+	convert_to_long(cipher);
+	convert_to_long(mode);
+	convert_to_string(data);
+	convert_to_string(key);
+	convert_to_string(iv);
+
+	if(iv->value.str.len != bsize) {
+		php3_error(E_WARNING, MCRYPT_IV_WRONG_SIZE);
+		RETURN_FALSE;
+	}
+
+	bsize = get_block_size(cipher->value.lval);
+	nr = (data->value.str.len + bsize - 1) / bsize;
+	nsize = nr * bsize;
+
+	td = init_mcrypt_ofb(cipher->value.lval, key->value.str.val, key->value.str.len, iv->value.str.val);
+	if(td == -1) {
+		php3_error(E_WARNING, MCRYPT_FAILED);
+		RETURN_FALSE;
+	}
+	
+	ndata = ecalloc(nr, bsize);
+	memcpy(ndata, data->value.str.val, data->value.str.len);
+	
+	if(mode->value.lval == 0)
+		mcrypt_ofb(td, ndata, nsize);
+	else
+		mdecrypt_ofb(td, ndata, nsize);
+	
+	end_mcrypt_ofb(td);
+
+	RETURN_STRINGL(ndata, nsize, 0);
+}
+
 /* proto mcrypt_cfb(int cipher, string key, string data, int mode, string iv)
    CFB crypt/decrypt data using key key with cipher cipher starting with iv */
 PHP_FUNCTION(mcrypt_cfb)
diff --git a/ext/mcrypt/php_mcrypt.h b/ext/mcrypt/php_mcrypt.h
index c207fc7275..70331e3bba 100644
--- a/ext/mcrypt/php_mcrypt.h
+++ b/ext/mcrypt/php_mcrypt.h
@@ -9,6 +9,7 @@ extern zend_module_entry mcrypt_module_entry;
 PHP_FUNCTION(mcrypt_ecb);
 PHP_FUNCTION(mcrypt_cbc);
 PHP_FUNCTION(mcrypt_cfb);
+PHP_FUNCTION(mcrypt_ofb);
 PHP_FUNCTION(mcrypt_get_block_size);
 PHP_FUNCTION(mcrypt_get_key_size);
 PHP_FUNCTION(mcrypt_create_iv);
-- 
2.40.0