diff --git a/std/ws/sha1.ts b/std/util/sha1.ts
similarity index 99%
rename from std/ws/sha1.ts
rename to std/util/sha1.ts
index fc86881f87..bb9103d276 100644
--- a/std/ws/sha1.ts
+++ b/std/util/sha1.ts
@@ -47,9 +47,9 @@ export class Sha1 {
     this._finalized = this._hashed = false;
   }
 
-  update(data: string | ArrayBuffer | ArrayBufferView): void {
+  update(data: string | ArrayBuffer | ArrayBufferView): Sha1 {
     if (this._finalized) {
-      return;
+      return this;
     }
     let notString = true;
     let message;
@@ -119,6 +119,7 @@ export class Sha1 {
       this._hBytes += (this._bytes / 4294967296) >>> 0;
       this._bytes = this._bytes >>> 0;
     }
+    return this;
   }
 
   finalize(): void {
diff --git a/std/ws/sha1_test.ts b/std/util/sha1_test.ts
similarity index 85%
rename from std/ws/sha1_test.ts
rename to std/util/sha1_test.ts
index 8830173a4d..159bdd94de 100644
--- a/std/ws/sha1_test.ts
+++ b/std/util/sha1_test.ts
@@ -3,20 +3,20 @@ const { test } = Deno;
 import { assertEquals } from "../testing/asserts.ts";
 import { Sha1 } from "./sha1.ts";
 
-test("[ws/sha] test1", () => {
+test("[util/sha] test1", () => {
   const sha1 = new Sha1();
   sha1.update("abcde");
   assertEquals(sha1.toString(), "03de6c570bfe24bfc328ccd7ca46b76eadaf4334");
 });
 
-test("[ws/sha] testWithArray", () => {
+test("[util/sha] testWithArray", () => {
   const data = Uint8Array.of(0x61, 0x62, 0x63, 0x64, 0x65);
   const sha1 = new Sha1();
   sha1.update(data);
   assertEquals(sha1.toString(), "03de6c570bfe24bfc328ccd7ca46b76eadaf4334");
 });
 
-test("[ws/sha] testSha1WithBuffer", () => {
+test("[util/sha] testSha1WithBuffer", () => {
   const data = Uint8Array.of(0x61, 0x62, 0x63, 0x64, 0x65);
   const sha1 = new Sha1();
   sha1.update(data.buffer);
diff --git a/std/uuid/_common.ts b/std/uuid/_common.ts
index b0cad25840..8f13ac7e32 100644
--- a/std/uuid/_common.ts
+++ b/std/uuid/_common.ts
@@ -13,6 +13,35 @@ export function bytesToUuid(bytes: number[] | Uint8Array): string {
     "-",
     ...bits.slice(8, 10),
     "-",
-    ...bits.slice(10),
+    ...bits.slice(10, 16),
   ].join("");
 }
+
+export function uuidToBytes(uuid: string): number[] {
+  const bytes: number[] = [];
+
+  uuid.replace(/[a-fA-F0-9]{2}/g, (hex: string): string => {
+    bytes.push(parseInt(hex, 16));
+    return "";
+  });
+
+  return bytes;
+}
+
+export function stringToBytes(str: string): number[] {
+  str = unescape(encodeURIComponent(str));
+  const bytes = new Array(str.length);
+  for (let i = 0; i < str.length; i++) {
+    bytes[i] = str.charCodeAt(i);
+  }
+  return bytes;
+}
+
+export function createBuffer(content: number[]): ArrayBuffer {
+  const arrayBuffer = new ArrayBuffer(content.length);
+  const uint8Array = new Uint8Array(arrayBuffer);
+  for (let i = 0; i < content.length; i++) {
+    uint8Array[i] = content[i];
+  }
+  return arrayBuffer;
+}
diff --git a/std/uuid/mod.ts b/std/uuid/mod.ts
index 23d0c6410e..7ffbb1349e 100644
--- a/std/uuid/mod.ts
+++ b/std/uuid/mod.ts
@@ -2,6 +2,7 @@
 // Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
 import * as v1 from "./v1.ts";
 import * as v4 from "./v4.ts";
+import * as v5 from "./v5.ts";
 
 export const NIL_UUID = "00000000-0000-0000-0000-000000000000";
 
@@ -21,7 +22,4 @@ const NOT_IMPLEMENTED = {
 // TODO Implement
 export const v3 = NOT_IMPLEMENTED;
 
-export { v1, v4 };
-
-// TODO Implement
-export const v5 = NOT_IMPLEMENTED;
+export { v1, v4, v5 };
diff --git a/std/uuid/test.ts b/std/uuid/test.ts
index 74d3c093d6..58eae2fff8 100755
--- a/std/uuid/test.ts
+++ b/std/uuid/test.ts
@@ -11,3 +11,7 @@ import "./tests/v1/generate.ts";
 // V4 Tests
 import "./tests/v4/validate.ts";
 import "./tests/v4/generate.ts";
+
+// V5 Tests
+import "./tests/v5/validate.ts";
+import "./tests/v5/generate.ts";
diff --git a/std/uuid/tests/v5/generate.ts b/std/uuid/tests/v5/generate.ts
new file mode 100644
index 0000000000..c869ef505c
--- /dev/null
+++ b/std/uuid/tests/v5/generate.ts
@@ -0,0 +1,66 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { assert, assertEquals } from "../../../testing/asserts.ts";
+const { test } = Deno;
+import { generate, validate } from "../../v5.ts";
+const NAMESPACE = "1b671a64-40d5-491e-99b0-da01ff1f3341";
+test({
+  name: "[UUID] test_uuid_v5",
+  fn(): void {
+    const u = generate({ value: "", namespace: NAMESPACE });
+    assertEquals(typeof u, "string", "returns a string");
+    assert(u !== "", "return string is not empty");
+  },
+});
+
+test({
+  name: "[UUID] test_uuid_v5_format",
+  fn(): void {
+    for (let i = 0; i < 10000; i++) {
+      const u = generate({ value: String(i), namespace: NAMESPACE }) as string;
+      assert(validate(u), `${u} is not a valid uuid v5`);
+    }
+  },
+});
+
+test({
+  name: "[UUID] test_uuid_v5_option",
+  fn(): void {
+    const v5Options = {
+      value: "Hello, World",
+      namespace: NAMESPACE,
+    };
+    const u = generate(v5Options);
+    assertEquals(u, "4b4f2adc-5b27-57b5-8e3a-c4c4bcf94f05");
+  },
+});
+
+test({
+  name: "[UUID] test_uuid_v5_buf_offset",
+  fn(): void {
+    const buf = [
+      75,
+      79,
+      42,
+      220,
+      91,
+      39,
+      87,
+      181,
+      142,
+      58,
+      196,
+      196,
+      188,
+      249,
+      79,
+      5,
+    ];
+    const origin = JSON.parse(JSON.stringify(buf));
+    generate({ value: "Hello, World", namespace: NAMESPACE }, buf);
+    assertEquals(origin, buf);
+
+    generate({ value: "Hello, World", namespace: NAMESPACE }, buf, 3);
+    assertEquals(origin.slice(0, 3), buf.slice(0, 3));
+    assertEquals(origin, buf.slice(3));
+  },
+});
diff --git a/std/uuid/tests/v5/validate.ts b/std/uuid/tests/v5/validate.ts
new file mode 100644
index 0000000000..888acb1c59
--- /dev/null
+++ b/std/uuid/tests/v5/validate.ts
@@ -0,0 +1,19 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+import { assert } from "../../../testing/asserts.ts";
+import { generate, validate } from "../../v5.ts";
+
+Deno.test({
+  name: "[UUID] is_valid_uuid_v5",
+  fn(): void {
+    const u = generate({
+      value: "Hello, World",
+      namespace: "1b671a64-40d5-491e-99b0-da01ff1f3341",
+    }) as string;
+    const t = "4b4f2adc-5b27-57b5-8e3a-c4c4bcf94f05";
+    const n = "4b4f2adc-5b27-17b5-8e3a-c4c4bcf94f05";
+
+    assert(validate(u), `generated ${u} should be valid`);
+    assert(validate(t), `${t} should be valid`);
+    assert(!validate(n), `${n} should not be valid`);
+  },
+});
diff --git a/std/uuid/v5.ts b/std/uuid/v5.ts
new file mode 100644
index 0000000000..1216762dde
--- /dev/null
+++ b/std/uuid/v5.ts
@@ -0,0 +1,52 @@
+// Copyright 2018-2020 the Deno authors. All rights reserved. MIT license.
+
+import {
+  bytesToUuid,
+  createBuffer,
+  stringToBytes,
+  uuidToBytes,
+} from "./_common.ts";
+import { Sha1 } from "../util/sha1.ts";
+import { isString } from "../node/util.ts";
+import { assert } from "../testing/asserts.ts";
+
+const UUID_RE = /^[0-9a-f]{8}-[0-9a-f]{4}-[5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;
+
+export function validate(id: string): boolean {
+  return UUID_RE.test(id);
+}
+
+interface V5Options {
+  value: string | number[];
+  namespace: string | number[];
+}
+
+export function generate(
+  options: V5Options,
+  buf?: number[],
+  offset?: number
+): string | number[] {
+  const i = (buf && offset) || 0;
+
+  let { value, namespace } = options;
+  if (isString(value)) value = stringToBytes(value as string);
+  if (isString(namespace)) namespace = uuidToBytes(namespace as string);
+  assert(
+    namespace.length === 16,
+    "namespace must be uuid string or an Array of 16 byte values"
+  );
+
+  const content = (namespace as number[]).concat(value as number[]);
+  const bytes = new Sha1().update(createBuffer(content)).digest();
+
+  bytes[6] = (bytes[6] & 0x0f) | 0x50;
+  bytes[8] = (bytes[8] & 0x3f) | 0x80;
+
+  if (buf) {
+    for (let idx = 0; idx < 16; ++idx) {
+      buf[i + idx] = bytes[idx];
+    }
+  }
+
+  return buf || bytesToUuid(bytes);
+}
diff --git a/std/ws/mod.ts b/std/ws/mod.ts
index 87084312fd..9632fbbfb0 100644
--- a/std/ws/mod.ts
+++ b/std/ws/mod.ts
@@ -4,7 +4,7 @@ import { decode, encode } from "../encoding/utf8.ts";
 import { hasOwnProperty } from "../util/has_own_property.ts";
 import { BufReader, BufWriter } from "../io/bufio.ts";
 import { readLong, readShort, sliceLongToBytes } from "../io/ioutil.ts";
-import { Sha1 } from "./sha1.ts";
+import { Sha1 } from "../util/sha1.ts";
 import { writeResponse } from "../http/io.ts";
 import { TextProtoReader } from "../textproto/mod.ts";
 import { Deferred, deferred } from "../util/async.ts";