diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..d92ce4f
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,6 @@
+[submodule "spec/multicodec"]
+	path = spec/multicodec
+	url = https://github.com/multiformats/multicodec.git
+[submodule "spec/multihash"]
+	path = spec/multihash
+	url = https://github.com/multiformats/multihash.git
diff --git a/multihash.go b/multihash.go
index ffb0944..52c2f56 100644
--- a/multihash.go
+++ b/multihash.go
@@ -64,7 +64,9 @@ const (
 
 	DBL_SHA2_256 = 0x56
 
-	MURMUR3 = 0x22
+	MURMUR3_128 = 0x22
+	// Deprecated: use MURMUR3_128
+	MURMUR3 = MURMUR3_128
 
 	X11 = 0x1100
 )
@@ -101,7 +103,7 @@ var Names = map[string]uint64{
 	"sha3-384":     SHA3_384,
 	"sha3-512":     SHA3_512,
 	"dbl-sha2-256": DBL_SHA2_256,
-	"murmur3":      MURMUR3,
+	"murmur3-128":  MURMUR3_128,
 	"keccak-224":   KECCAK_224,
 	"keccak-256":   KECCAK_256,
 	"keccak-384":   KECCAK_384,
@@ -123,7 +125,7 @@ var Codes = map[uint64]string{
 	SHA3_384:     "sha3-384",
 	SHA3_512:     "sha3-512",
 	DBL_SHA2_256: "dbl-sha2-256",
-	MURMUR3:      "murmur3",
+	MURMUR3_128:  "murmur3-128",
 	KECCAK_224:   "keccak-224",
 	KECCAK_256:   "keccak-256",
 	KECCAK_384:   "keccak-384",
@@ -147,7 +149,7 @@ var DefaultLengths = map[uint64]int{
 	DBL_SHA2_256: 32,
 	KECCAK_224:   28,
 	KECCAK_256:   32,
-	MURMUR3:      4,
+	MURMUR3_128:  4,
 	KECCAK_384:   48,
 	KECCAK_512:   64,
 	SHAKE_128:    32,
diff --git a/multihash_test.go b/multihash_test.go
index 9a7c722..3d579f9 100644
--- a/multihash_test.go
+++ b/multihash_test.go
@@ -5,6 +5,7 @@ import (
 	"encoding/binary"
 	"encoding/hex"
 	"fmt"
+	"strings"
 	"testing"
 )
 
@@ -20,7 +21,7 @@ var tCodes = map[uint64]string{
 	0x16:   "sha3-256",
 	0x17:   "sha3-224",
 	0x56:   "dbl-sha2-256",
-	0x22:   "murmur3",
+	0x22:   "murmur3-128",
 	0x1A:   "keccak-224",
 	0x1B:   "keccak-256",
 	0x1C:   "keccak-384",
@@ -45,7 +46,7 @@ var testCases = []TestCase{
 	{"2c26b46b68ffc68ff99b453c1d30413413422d706483bfa0f98a5e886266e7ae", 0x12, "sha2-256"},
 	{"2c26b46b", 0x12, "sha2-256"},
 	{"2c26b46b68ffc68ff99b453c1d30413413", 0xb240, "blake2b-512"},
-	{"243ddb9e", 0x22, "murmur3"},
+	{"243ddb9e", 0x22, "murmur3-128"},
 	{"f00ba4", 0x1b, "keccak-256"},
 	{"f84e95cb5fbd2038863ab27d3cdeac295ad2d4ab96ad1f4b070c0bf36078ef08", 0x18, "shake-128"},
 	{"1af97f7818a28edfdfce5ec66dbdc7e871813816d7d585fe1f12475ded5b6502b7723b74e2ee36f2651a10a8eaca72aa9148c3c761aaceac8f6d6cc64381ed39", 0x19, "shake-256"},
@@ -175,6 +176,34 @@ func TestTable(t *testing.T) {
 			t.Error("Table mismatch: ", Names[v], k)
 		}
 	}
+
+	for name, code := range Names {
+		if tCodes[code] != name {
+			if strings.HasPrefix(name, "blake") {
+				// skip these
+				continue
+			}
+			if name == "sha3" {
+				// tested as "sha3-512"
+				continue
+			}
+			t.Error("missing test case for: ", name)
+		}
+	}
+
+	for code, name := range Codes {
+		if tCodes[code] != name {
+			if strings.HasPrefix(name, "blake") {
+				// skip these
+				continue
+			}
+			if name == "sha3" {
+				// tested as "sha3-512"
+				continue
+			}
+			t.Error("missing test case for: ", name)
+		}
+	}
 }
 
 func ExampleDecode() {
diff --git a/spec/multicodec b/spec/multicodec
new file mode 160000
index 0000000..ba90699
--- /dev/null
+++ b/spec/multicodec
@@ -0,0 +1 @@
+Subproject commit ba906993c21b6de66740d966926367bd741ee0be
diff --git a/spec/multihash b/spec/multihash
new file mode 160000
index 0000000..cde1aef
--- /dev/null
+++ b/spec/multihash
@@ -0,0 +1 @@
+Subproject commit cde1aef8158d193d73012b7d730013f05c2f7063
diff --git a/spec_test.go b/spec_test.go
new file mode 100644
index 0000000..08d550e
--- /dev/null
+++ b/spec_test.go
@@ -0,0 +1,133 @@
+package multihash
+
+import (
+	"encoding/csv"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func TestSpec(t *testing.T) {
+	file, err := os.Open("spec/multicodec/table.csv")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer file.Close()
+
+	reader := csv.NewReader(file)
+	reader.LazyQuotes = false
+	reader.FieldsPerRecord = 4
+	reader.TrimLeadingSpace = true
+
+	values, err := reader.ReadAll()
+	if err != nil {
+		t.Error(err)
+	}
+	expectedFunctions := make(map[uint64]string, len(values)-1)
+	if values[0][0] != "name" || values[0][1] != "tag" || values[0][2] != "code" {
+		t.Fatal("table format has changed")
+	}
+
+	for _, v := range values[1:] {
+		name := v[0]
+		tag := v[1]
+		codeStr := v[2]
+
+		if tag != "multihash" {
+			// not a multihash function
+			continue
+		}
+
+		var code uint64
+		if !strings.HasPrefix(codeStr, "0x") {
+			t.Errorf("invalid multicodec code %q (%s)", codeStr, name)
+			continue
+		}
+
+		i, err := strconv.ParseUint(codeStr[2:], 16, 64)
+		if err != nil {
+			t.Errorf("invalid multibase code %q (%s)", codeStr, name)
+			continue
+		}
+		code = uint64(i)
+		expectedFunctions[code] = name
+	}
+
+	for code, name := range Codes {
+		expectedName, ok := expectedFunctions[code]
+		if !ok {
+			t.Errorf("multihash %q (%x) not defined in the spec", name, code)
+			continue
+		}
+		if expectedName != name {
+			t.Errorf("encoding %q (%x) has unexpected name %q", expectedName, code, name)
+		}
+	}
+}
+
+func TestSpecVectors(t *testing.T) {
+	file, err := os.Open("spec/multihash/tests/values/test_cases.csv")
+	if err != nil {
+		t.Error(err)
+		return
+	}
+	defer file.Close()
+
+	reader := csv.NewReader(file)
+	reader.LazyQuotes = false
+	reader.FieldsPerRecord = 4
+	reader.TrimLeadingSpace = true
+
+	values, err := reader.ReadAll()
+	if err != nil {
+		t.Error(err)
+	}
+	if len(values) == 0 {
+		t.Error("no test values")
+		return
+	}
+
+	// check the header.
+	if values[0][0] != "algorithm" ||
+		values[0][1] != "bits" ||
+		values[0][2] != "input" ||
+		values[0][3] != "multihash" {
+		t.Fatal("table format has changed")
+	}
+
+	for i, testCase := range values[1:] {
+		function := testCase[0]
+		lengthStr := testCase[1]
+		input := testCase[2]
+		expectedStr := testCase[3]
+
+		t.Run(fmt.Sprintf("%d/%s/%s", i, function, lengthStr), func(t *testing.T) {
+			code, ok := Names[function]
+			if !ok {
+				t.Skipf("skipping %s: not supported", function)
+				return
+			}
+
+			length, err := strconv.ParseInt(lengthStr, 10, 64)
+			if err != nil {
+				t.Fatalf("failed to decode length: %s", err)
+			}
+
+			if length%8 != 0 {
+				t.Fatal("expected the length to be a multiple of 8")
+			}
+
+			actual, err := Sum([]byte(input), code, int(length/8))
+			if err != nil {
+				t.Fatalf("failed to hash: %s", err)
+			}
+			actualStr := actual.HexString()
+			if actualStr != expectedStr {
+				t.Fatalf("got the wrong hash: expected %s, got %s", expectedStr, actualStr)
+			}
+		})
+
+	}
+}
diff --git a/sum.go b/sum.go
index c68e160..bfc2043 100644
--- a/sum.go
+++ b/sum.go
@@ -185,7 +185,7 @@ func registerNonStdlibHashFuncs() {
 	RegisterHashFunc(SHA3_384, sumSHA3_384)
 	RegisterHashFunc(SHA3_512, sumSHA3_512)
 
-	RegisterHashFunc(MURMUR3, sumMURMUR3)
+	RegisterHashFunc(MURMUR3_128, sumMURMUR3)
 
 	RegisterHashFunc(SHAKE_128, sumSHAKE128)
 	RegisterHashFunc(SHAKE_256, sumSHAKE256)
diff --git a/sum_test.go b/sum_test.go
index d5123fa..296be3a 100644
--- a/sum_test.go
+++ b/sum_test.go
@@ -47,7 +47,7 @@ var sumTestCases = []SumTestCase{
 	{BLAKE2B_MIN, -1, "foo", "81e4020152"},
 	{BLAKE2B_MIN, 1, "foo", "81e4020152"},
 	{BLAKE2S_MAX, 32, "foo", "e0e4022008d6cad88075de8f192db097573d0e829411cd91eb6ec65e8fc16c017edfdb74"},
-	{MURMUR3, 4, "beep boop", "2204243ddb9e"},
+	{MURMUR3_128, 4, "beep boop", "2204243ddb9e"},
 	{KECCAK_256, 32, "foo", "1b2041b1a0649752af1b28b3dc29a1556eee781e4a4c3a1f7f53f90fa834de098c4d"},
 	{KECCAK_512, -1, "beep boop", "1d40e161c54798f78eba3404ac5e7e12d27555b7b810e7fd0db3f25ffa0c785c438331b0fbb6156215f69edf403c642e5280f4521da9bd767296ec81f05100852e78"},
 	{SHAKE_128, 32, "foo", "1820f84e95cb5fbd2038863ab27d3cdeac295ad2d4ab96ad1f4b070c0bf36078ef08"},