diff --git a/Makefile b/Makefile
index a5e3deb880..837e0ecd01 100644
--- a/Makefile
+++ b/Makefile
@@ -29,8 +29,9 @@ CFLAGS += -I.
 CFLAGS += -DVALGRIND=$(VALGRIND)
 CFLAGS += -DUSE_ETHEREUM=1
 CFLAGS += -DUSE_GRAPHENE=1
-CFLAGS += -DUSE_NEM=1
+CFLAGS += -DUSE_KECCAK=1
 CFLAGS += -DUSE_MONERO=1
+CFLAGS += -DUSE_NEM=1
 CFLAGS += -DUSE_CARDANO=1
 CFLAGS += $(shell pkg-config --cflags openssl)
 
diff --git a/ed25519-donna/ed25519-donna.h b/ed25519-donna/ed25519-donna.h
index 1cf3186e29..d3c3402270 100644
--- a/ed25519-donna/ed25519-donna.h
+++ b/ed25519-donna/ed25519-donna.h
@@ -8,6 +8,9 @@
 		Bo-Yin Yang
 */
 
+#ifndef ED25519_DONNA_H
+#define ED25519_DONNA_H
+
 #include "ed25519-donna-portable.h"
 
 #include "curve25519-donna-32bit.h"
@@ -45,3 +48,5 @@ typedef struct ge25519_pniels_t {
 #include "ed25519-donna-32bit-tables.h"
 
 #include "ed25519-donna-impl-base.h"
+
+#endif
diff --git a/hasher.c b/hasher.c
index a52eefdd34..762bc321af 100644
--- a/hasher.c
+++ b/hasher.c
@@ -30,6 +30,12 @@ void hasher_Init(Hasher *hasher, HasherType type) {
 	case HASHER_SHA2D:
 		sha256_Init(&hasher->ctx.sha2);
 		break;
+	case HASHER_SHA3:
+#if USE_KECCAK
+	case HASHER_SHA3K:
+#endif
+		sha3_256_Init(&hasher->ctx.sha3);
+		break;
 	case HASHER_BLAKE:
 	case HASHER_BLAKED:
 		blake256_Init(&hasher->ctx.blake);
@@ -62,6 +68,12 @@ void hasher_Update(Hasher *hasher, const uint8_t *data, size_t length) {
 	case HASHER_SHA2D:
 		sha256_Update(&hasher->ctx.sha2, data, length);
 		break;
+	case HASHER_SHA3:
+#if USE_KECCAK
+	case HASHER_SHA3K:
+#endif
+		sha3_Update(&hasher->ctx.sha3, data, length);
+		break;
 	case HASHER_BLAKE:
 	case HASHER_BLAKED:
 		blake256_Update(&hasher->ctx.blake, data, length);
@@ -87,6 +99,14 @@ void hasher_Final(Hasher *hasher, uint8_t hash[HASHER_DIGEST_LENGTH]) {
 		sha256_Final(&hasher->ctx.sha2, hash);
 		hasher_Raw(HASHER_SHA2, hash, HASHER_DIGEST_LENGTH, hash);
 		break;
+	case HASHER_SHA3:
+		sha3_Final(&hasher->ctx.sha3, hash);
+		break;
+#if USE_KECCAK
+	case HASHER_SHA3K:
+		keccak_Final(&hasher->ctx.sha3, hash);
+		break;
+#endif
 	case HASHER_BLAKE:
 		blake256_Final(&hasher->ctx.blake, hash);
 		break;
diff --git a/hasher.h b/hasher.h
index 3a561673cb..fe4f5f7b19 100644
--- a/hasher.h
+++ b/hasher.h
@@ -27,6 +27,7 @@
 #include <stdint.h>
 
 #include "sha2.h"
+#include "sha3.h"
 #include "blake256.h"
 #include "groestl.h"
 #include "blake2b.h"
@@ -35,9 +36,14 @@
 
 typedef enum {
     HASHER_SHA2,
-    HASHER_BLAKE,
-
     HASHER_SHA2D,
+
+    HASHER_SHA3,
+#if USE_KECCAK
+    HASHER_SHA3K,
+#endif
+
+    HASHER_BLAKE,
     HASHER_BLAKED,
 
     HASHER_GROESTLD_TRUNC, /* Double Groestl512 hasher truncated to 256 bits */
@@ -52,10 +58,11 @@ typedef struct {
     HasherType type;
 
     union {
-        SHA256_CTX sha2;
-        BLAKE256_CTX blake;
-        GROESTL512_CTX groestl;
-        BLAKE2B_CTX blake2b;
+        SHA256_CTX sha2;        // for HASHER_SHA2{,D}
+        SHA3_CTX sha3;          // for HASHER_SHA3{,K}
+        BLAKE256_CTX blake;     // for HASHER_BLAKE{,D}
+        GROESTL512_CTX groestl; // for HASHER_GROESTLD_TRUNC
+        BLAKE2B_CTX blake2b;    // for HASHER_OVERWINTER_*
     } ctx;
 } Hasher;