Patch busybox version 1.36.0 to support password hashing with gost-yescrypt

busybox_gost-yescrypt.patch

diff -urN a/include/libbb.h b/include/libbb.h
--- a/include/libbb.h	2023-01-03 17:17:01.000000000 +0300
+++ b/include/libbb.h	2024-07-17 11:28:28.000000000 +0300
@@ -1777,8 +1777,14 @@
  * (otherwise we risk having same salt generated)
  */
 extern int crypt_make_salt(char *p, int cnt /*, int rnd*/) FAST_FUNC;
+
+#if ENABLE_GOST_YESCRYPT
+/* $gy$j9T$ + salt(16) + NUL */
+#define MAX_PW_SALT_LEN (8 + 16 + 1)
+#else
 /* "$N$" + sha_salt_16_bytes + NUL */
 #define MAX_PW_SALT_LEN (3 + 16 + 1)
+#endif
 extern char* crypt_make_pw_salt(char p[MAX_PW_SALT_LEN], const char *algo) FAST_FUNC;
 
 
diff -urN a/include/usage.src.h b/include/usage.src.h
--- a/include/usage.src.h	2023-01-03 17:17:01.000000000 +0300
+++ b/include/usage.src.h	2024-07-17 13:03:24.000000000 +0300
@@ -18,13 +18,18 @@
 #define scripted_full_usage ""
 
 #if !ENABLE_USE_BB_CRYPT || ENABLE_USE_BB_CRYPT_SHA
-# define CRYPT_METHODS_HELP_STR "des,md5,sha256/512" \
-	" (default "CONFIG_FEATURE_DEFAULT_PASSWD_ALGO")"
+# if ENABLE_GOST_YESCRYPT
+#  define _CRYPT_METHODS_HELP_STR "des,md5,sha256/512,gy"
+# else
+#  define _CRYPT_METHODS_HELP_STR "des,md5,sha256/512"
+# endif
 #else
-# define CRYPT_METHODS_HELP_STR "des,md5" \
-	" (default "CONFIG_FEATURE_DEFAULT_PASSWD_ALGO")"
+# define _CRYPT_METHODS_HELP_STR "des,md5"
 #endif
 
+#define CRYPT_METHODS_HELP_STR _CRYPT_METHODS_HELP_STR \
+	" (default "CONFIG_FEATURE_DEFAULT_PASSWD_ALGO")"
+
 #if ENABLE_FEATURE_HWCLOCK_ADJTIME_FHS
 # define ADJTIME_PATH "/var/lib/hwclock/adjtime"
 #else
diff -urN a/libbb/pw_encrypt.c b/libbb/pw_encrypt.c
--- a/libbb/pw_encrypt.c	2023-01-03 17:17:01.000000000 +0300
+++ b/libbb/pw_encrypt.c	2024-07-17 11:55:24.000000000 +0300
@@ -71,6 +71,14 @@
 			len = 16/2;
 		}
 #endif
+#if ENABLE_GOST_YESCRYPT
+		if ((algo[0] == 'g') && (algo[1] == 'y')) {
+			/* j9T -- often used algorithm parameters */
+			sprintf(salt + 1, "%s$j9T$", algo);
+			salt_ptr = salt + 8;
+			len = 16/2;
+		}
+#endif
 	}
 	crypt_make_salt(salt_ptr, len);
 	return salt_ptr;
diff -urN a/loginutils/Config.src b/loginutils/Config.src
--- a/loginutils/Config.src	2023-01-03 17:17:01.000000000 +0300
+++ b/loginutils/Config.src	2024-07-19 07:48:37.000000000 +0300
@@ -91,6 +91,17 @@
 	With this option off, login will fail password check for any
 	user which has password encrypted with these algorithms.
 
+config GOST_YESCRYPT
+	bool "Enable gost-yescrypt password processing"
+	default n
+	depends on !USE_BB_CRYPT && PASSWD
+	help
+	Enable this if you want to create or check password entries
+	hashed with gost-yescrypt algorithm. The algorithm is supported
+	by PAM and libxcrypt since 2018.
+	With this option off, login will fail password check for any
+	user which has password encrypted via gost-yescrypt.
+
 INSERT
 
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