Issue #26798: Add BLAKE2 (blake2b and blake2s) to hashlib.
diff --git a/Modules/_blake2/blake2ns.h b/Modules/_blake2/blake2ns.h
new file mode 100644
index 0000000..53bce8e
--- /dev/null
+++ b/Modules/_blake2/blake2ns.h
@@ -0,0 +1,32 @@
+/* Prefix all public blake2 symbols with PyBlake2_
+ */
+
+#ifndef Py_BLAKE2_NS
+#define Py_BLAKE2_NS
+
+#define blake2b PyBlake2_blake2b
+#define blake2b_compress PyBlake2_blake2b_compress
+#define blake2b_final PyBlake2_blake2b_final
+#define blake2b_init PyBlake2_blake2b_init
+#define blake2b_init_key PyBlake2_blake2b_init_key
+#define blake2b_init_param PyBlake2_blake2b_init_param
+#define blake2b_update PyBlake2_blake2b_update
+#define blake2bp PyBlake2_blake2bp
+#define blake2bp_final PyBlake2_blake2bp_final
+#define blake2bp_init PyBlake2_blake2bp_init
+#define blake2bp_init_key PyBlake2_blake2bp_init_key
+#define blake2bp_update PyBlake2_blake2bp_update
+#define blake2s PyBlake2_blake2s
+#define blake2s_compress PyBlake2_blake2s_compress
+#define blake2s_final PyBlake2_blake2s_final
+#define blake2s_init PyBlake2_blake2s_init
+#define blake2s_init_key PyBlake2_blake2s_init_key
+#define blake2s_init_param PyBlake2_blake2s_init_param
+#define blake2s_update PyBlake2_blake2s_update
+#define blake2sp PyBlake2_blake2sp
+#define blake2sp_final PyBlake2_blake2sp_final
+#define blake2sp_init PyBlake2_blake2sp_init
+#define blake2sp_init_key PyBlake2_blake2sp_init_key
+#define blake2sp_update PyBlake2_blake2sp_update
+
+#endif /* Py_BLAKE2_NS */