diff --git a/src/libsodium/crypto_generichash/crypto_generichash.c b/src/libsodium/crypto_generichash/crypto_generichash.c
index 9deb0d14..d54b4a9a 100644
--- a/src/libsodium/crypto_generichash/crypto_generichash.c
+++ b/src/libsodium/crypto_generichash/crypto_generichash.c
@@ -1,6 +1,41 @@
 
 #include "crypto_generichash.h"
 
+size_t
+crypto_generichash_bytes_min(void)
+{
+    return crypto_generichash_BYTES_MIN;
+}
+
+size_t
+crypto_generichash_bytes_max(void)
+{
+    return crypto_generichash_BYTES_MAX;
+}
+
+size_t
+crypto_generichash_keybytes_min(void)
+{
+    return crypto_generichash_KEYBYTES_MIN;
+}
+
+size_t
+crypto_generichash_keybytes_max(void)
+{
+    return crypto_generichash_KEYBYTES_MAX;
+}
+
+size_t
+crypto_generichash_blockbytes(void)
+{
+    return crypto_generichash_BLOCKBYTES;
+}
+
+const char *crypto_generichash_primitive(void)
+{
+    return crypto_generichash_PRIMITIVE;
+}
+
 int
 crypto_generichash(unsigned char *out, size_t outlen, const unsigned char *in,
                    unsigned long long inlen, const unsigned char *key,
diff --git a/src/libsodium/include/sodium/crypto_generichash.h b/src/libsodium/include/sodium/crypto_generichash.h
index d5db065a..c37a9edd 100644
--- a/src/libsodium/include/sodium/crypto_generichash.h
+++ b/src/libsodium/include/sodium/crypto_generichash.h
@@ -3,16 +3,28 @@
 
 #include "crypto_generichash_blake2b.h"
 
-#define crypto_generichash_BYTES_MIN crypto_generichash_blake2b_BYTES_MIN
-#define crypto_generichash_BYTES_MAX crypto_generichash_blake2b_BYTES_MAX
-#define crypto_generichash_KEYBYTES_MIN crypto_generichash_blake2b_KEYBYTES_MIN
-#define crypto_generichash_KEYBYTES_MAX crypto_generichash_blake2b_KEYBYTES_MAX
-#define crypto_generichash_PRIMITIVE "blake2b"
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+#define crypto_generichash_BYTES_MIN crypto_generichash_blake2b_BYTES_MIN
+size_t  crypto_generichash_bytes_min(void);
+
+#define crypto_generichash_BYTES_MAX crypto_generichash_blake2b_BYTES_MAX
+size_t  crypto_generichash_bytes_max(void);
+
+#define crypto_generichash_KEYBYTES_MIN crypto_generichash_blake2b_KEYBYTES_MIN
+size_t  crypto_generichash_keybytes_min(void);
+
+#define crypto_generichash_KEYBYTES_MAX crypto_generichash_blake2b_KEYBYTES_MAX
+size_t  crypto_generichash_keybytes_max(void);
+
+#define crypto_generichash_BLOCKBYTES crypto_generichash_blake2b_BLOCKBYTES
+size_t  crypto_generichash_blockbytes(void);
+
+#define crypto_generichash_PRIMITIVE "blake2b"
+const char *crypto_generichash_primitive(void);
+
 typedef crypto_generichash_blake2b_state crypto_generichash_state;
 
 int crypto_generichash(unsigned char *out, size_t outlen,