diff --git a/lib/crypto.browser.js b/lib/crypto.browser.js
index dc78860..7415e1a 100644
--- a/lib/crypto.browser.js
+++ b/lib/crypto.browser.js
@@ -25,6 +25,12 @@ exports.sha512 = function(buf) {
   });
 };
 
+exports.sha256 = function(buf) {
+  return subtle.digest({name: "SHA-256"}, buf).then(function(arr) {
+    return new Buffer(new Uint8Array(arr));
+  });
+};
+
 exports.ripemd160 = function(buf) {
   // XXX(Kagami): No support in browsers via Web Crypto API currently,
   // so use module.
diff --git a/lib/crypto.js b/lib/crypto.js
index c341da4..c8b5154 100644
--- a/lib/crypto.js
+++ b/lib/crypto.js
@@ -14,6 +14,12 @@ exports.sha512 = function(buf) {
   return Promise.resolve(hash.digest());
 };
 
+exports.sha256 = function(buf) {
+  var hash = crypto.createHash("sha256");
+  hash.update(buf);
+  return Promise.resolve(hash.digest());
+};
+
 exports.ripemd160 = function(buf) {
   var hash = crypto.createHash("ripemd160");
   hash.update(buf);
diff --git a/test.js b/test.js
index e5aefca..39e01b5 100644
--- a/test.js
+++ b/test.js
@@ -47,6 +47,12 @@ describe("Crypto", function() {
     });
   });
 
+  it("should implement SHA-256 hash", function() {
+    return bmcrypto.sha256(Buffer("test")).then(function(res) {
+      expect(res.toString("hex")).to.equal("9f86d081884c7d659a2feaa0c55ad015a3bf4f1b2b0b822cd15d6c15b0f00a08");
+    });
+  });
+
   it("should implement RIPEMD-160 hash", function() {
     return bmcrypto.ripemd160(Buffer("test")).then(function(res) {
       expect(res.toString("hex")).to.equal("5e52fee47e6b070565f74372468cdc699de89107");