diff --git a/README.md b/README.md
index 8f515b1..5e49ab4 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,27 @@ You can also have the following entries
 - name: name of the folder inside `remoteBasePath` that overrides the default from package's name.
 - snapshotName: name of the snapshot version that will override the default `development`
 
+### Files Cryptographic Digest
+
+If you need the digest of the files you upload you can also add inside `ccu` in your `package.json` the following
+
+```json
+"digest": {
+  "hashes": ["sha384"]
+}
+```
+
+This will generate the `sha384` digest of every file to upload and store it in a different file named `<filename>.<hash-method>`. In the case you only need to hash only some files, e.g. JS only
+
+```json
+"digest": {
+  "hashes": ["sha384"],
+  "extensions": [".js"]
+}
+```
+
+> The valid types of digests are `sha256`, `sha384` and `sha512`, if none is specified the tool will generate no digest files.
+
 ## Usage
 
 ```
diff --git a/aws/index.js b/aws/index.js
index ca4e7cf..dc954c4 100644
--- a/aws/index.js
+++ b/aws/index.js
@@ -6,6 +6,7 @@ var s3 = require('s3');
 var walk = require('walk');
 var path = require('path');
 var client = s3.createClient({});
+var files = require('../files');
 
 var uploader = function (version, options) {
   return from(options.localPaths).map(function (directoryPath) {
@@ -21,25 +22,10 @@ var uploader = function (version, options) {
     };
     var logger = options.logger;
     if (options.dry) {
-      return Rx.Observable.create(function (observer) {
-        logger.debug(`Starting upload with following S3 config ${logger.pretty(params)}`);
-        var workingDir = process.cwd();
-        var walker = walk.walk(params.localDir, { followLinks: false });
-        walker.on('file', function (root, stats, next) {
-          var localPath = path.relative(workingDir, path.resolve(root, stats.name));
-          var file = localPath.replace(directoryPath, version.remotePath);
-          observer.next(file);
-          next();
-        });
-        walker.on('error', function(root, stats, next) {
-          observer.onError(stats.error);
-          next();
-        });
-        walker.on('end', function() {
-          observer.onCompleted();
-        });
-        return function() {};
-      });
+      logger.debug(`Starting upload with following S3 config ${logger.pretty(params)}`);
+      return files
+      .walk(params.localDir)
+      .map((localFile) => localFile.replace(directoryPath, version.remotePath));
     }
     return Rx.Observable.create(function (observer) {
       logger.debug(`Starting upload with following S3 config ${logger.pretty(params)}`);
diff --git a/configuration/index.js b/configuration/index.js
index c9e2597..91323bb 100644
--- a/configuration/index.js
+++ b/configuration/index.js
@@ -5,6 +5,7 @@ module.exports = function (pkgInfo) {
     throw 'Missing configuration options from package.json';
   }
   var config = pkgInfo['ccu'];
+  var digest = config.digest || {};
   return {
     name: config.name || pkgInfo.name,
     version: pkgInfo.version,
@@ -13,6 +14,8 @@ module.exports = function (pkgInfo) {
     bucket: config.bucket,
     cdn: config.cdn,
     mainBundleFile: config.mainBundleFile,
-    snapshotName: config.snapshotName
+    snapshotName: config.snapshotName,
+    hashes: Array.isArray(digest.hashes) ? digest.hashes : [],
+    hashOnly: Array.isArray(digest.extensions) ? digest.extensions : []
   };
 };
\ No newline at end of file
diff --git a/files/index.js b/files/index.js
new file mode 100644
index 0000000..951ee1f
--- /dev/null
+++ b/files/index.js
@@ -0,0 +1,27 @@
+'use strict';
+
+const walk = require('walk');
+const path = require('path');
+const Rx = require('rx');
+
+module.exports = {
+  write: (filePath, contents) => fs.writeFileSync(filePath, contents, { encoding:'utf8' }),
+  walk: (directory) => {
+    return Rx.Observable.create((observer) => {
+      const walker = walk.walk(directory, { followLinks: false });
+      walker.on('file', (root, stats, next) => {
+        const workingDir = process.cwd();
+        const localPath = path.relative(workingDir, path.resolve(root, stats.name));
+        observer.next(localPath);
+        next();
+      });
+      walker.on('error', (root, stats, next) => {
+        observer.onError(stats.error);
+        next();
+      });
+      walker.on('end', () => {
+        observer.onCompleted();
+      });
+    });
+  }
+};
diff --git a/hash/digest.js b/hash/digest.js
new file mode 100644
index 0000000..7d3bffd
--- /dev/null
+++ b/hash/digest.js
@@ -0,0 +1,41 @@
+'use strict';
+
+const Rx = require('rx');
+const from = Rx.Observable.from;
+const path = require('path');
+const fs = require('fs');
+const crypto = require('crypto');
+
+const availableDigests = ['sha256', 'sha384', 'sha512'];
+
+const fromFile = (file, hash) => {
+  return Rx.Observable.create((observer) => {
+    const fd = fs.createReadStream(file);
+    fd.on('end', function() {
+      hash.end();
+      const value = hash.read();
+      observer.next(value);
+      observer.onCompleted();
+    });
+    fd.on('error', (error) => observer.onError(error));
+    fd.pipe(hash);
+    return () => {};
+  });
+};
+
+const digest = (method, file) => {
+  const hash = crypto.createHash(method);
+  hash.setEncoding('base64');
+  return fromFile(file, hash).map((value) => {
+    return { file, digest: value, method };
+  });
+};
+
+module.exports = (file, options) => {
+  const digests = availableDigests.filter((d) => options.hashes.length == 0 || options.hashes.indexOf(d) != -1);
+  return Rx.Observable
+  .from(digests)
+  .flatMap((method) => digest(method, file));
+};
+
+module.exports.available = availableDigests;
\ No newline at end of file
diff --git a/hash/index.js b/hash/index.js
new file mode 100644
index 0000000..7f74696
--- /dev/null
+++ b/hash/index.js
@@ -0,0 +1,34 @@
+'use strict';
+
+const Rx = require('rx');
+const from = Rx.Observable.from;
+const files = require('../files');
+const digest = require('./digest');
+const path = require('path');
+
+module.exports = function(options) {
+  if (options.hashes.length == 0) {
+    return Rx.Observable.empty();
+  }
+  const logger = options.logger;
+  const ignoredExtensions = digest.available.map((d) => `.${d}`);
+  const hashOnly = options.hashOnly;
+  logger.debug(`Checking for files to hash in ${options.localPaths}`);
+  return from(options.localPaths).map(function (directoryPath) {
+    logger.debug(`Starting to hash files in ${directoryPath}`);
+    return files.walk(directoryPath)
+    .filter((filePath) => {
+      const parts = path.parse(filePath);
+      return ignoredExtensions.indexOf(parts.ext) == -1 && (options.hashOnly.length == 0 || options.hashOnly.indexOf(parts.ext) != -1);
+    })
+    .flatMap((localPath) => {
+      return digest(localPath, options)
+    })
+  })
+  .concatAll()
+  .doOnNext((value) => {
+    if (!options.dry) {
+      files.write(`${value.file}.${value.method}`, value.digest);
+    }
+  });
+}
\ No newline at end of file
diff --git a/index.js b/index.js
index 4b0c759..bf3da7c 100644
--- a/index.js
+++ b/index.js
@@ -8,6 +8,7 @@ var just = Rx.Observable.just;
 var from = Rx.Observable.from;
 var Logger = require('./logger');
 var extend = require('util')._extend;
+var hash = require('./hash');
 
 module.exports = function (options) {
   var logger = new Logger(options);
@@ -15,13 +16,18 @@ module.exports = function (options) {
   logger.debug(`Starting upload process with parameters ${logger.pretty(options)}`);
   var state = Object.assign({ logger: logger }, options);
   var cdn = new CDN(state);
-  cdn.exists(resolver.full(state).remotePath)
-  .tapOnNext(function (exists) {
-    if(exists) {
-      logger.warn(`File ${state.mainBundleFile} exists for version ${state.version}`);
-    }
-  })
-  .flatMap(function(exist) {
+  Rx.Observable.forkJoin([
+    cdn.exists(resolver.full(state).remotePath).tapOnNext(function (exists) {
+      if(exists) {
+        logger.warn(`File ${state.mainBundleFile} exists for version ${state.version}`);
+      }
+    }),
+    hash(state).tapOnNext(function (result) {
+      logger.debug(`File ${result.file} has ${result.method} digest ${result.digest}`);
+    })
+  ])
+  .flatMap(function(result) {
+    const exist = result[0];
     return from(resolver.for(state, exist))
     .flatMap(function (version) {
       return aws.uploader(version, state);
diff --git a/sample/package-lock.json b/sample/package-lock.json
new file mode 100644
index 0000000..8bae806
--- /dev/null
+++ b/sample/package-lock.json
@@ -0,0 +1,2067 @@
+{
+  "name": "sample-dus",
+  "version": "10.0.0",
+  "lockfileVersion": 1,
+  "requires": true,
+  "dependencies": {
+    "@auth0/component-cdn-uploader": {
+      "version": "2.0.0",
+      "requires": {
+        "chalk": "1.1.3",
+        "meow": "3.7.0",
+        "request": "2.81.0",
+        "rx": "4.1.0",
+        "s3": "4.4.0",
+        "semver": "5.3.0",
+        "walk": "2.3.9"
+      },
+      "dependencies": {
+        "@auth0/component-cdn-uploader": {
+          "version": "2.0.0",
+          "bundled": true,
+          "requires": {
+            "chalk": "1.1.3",
+            "meow": "3.7.0",
+            "request": "2.87.0",
+            "rx": "4.1.0",
+            "s3": "4.4.0",
+            "semver": "5.5.0",
+            "walk": "2.3.13"
+          },
+          "dependencies": {
+            "ajv": {
+              "version": "5.5.2",
+              "bundled": true,
+              "requires": {
+                "co": "4.6.0",
+                "fast-deep-equal": "1.1.0",
+                "fast-json-stable-stringify": "2.0.0",
+                "json-schema-traverse": "0.3.1"
+              }
+            },
+            "ansi-regex": {
+              "version": "2.1.1",
+              "bundled": true
+            },
+            "ansi-styles": {
+              "version": "2.2.1",
+              "bundled": true
+            },
+            "array-find-index": {
+              "version": "1.0.2",
+              "bundled": true
+            },
+            "asn1": {
+              "version": "0.2.3",
+              "bundled": true
+            },
+            "assert-plus": {
+              "version": "1.0.0",
+              "bundled": true
+            },
+            "asynckit": {
+              "version": "0.4.0",
+              "bundled": true
+            },
+            "aws-sdk": {
+              "version": "2.0.31",
+              "bundled": true,
+              "requires": {
+                "xml2js": "0.2.6",
+                "xmlbuilder": "0.4.2"
+              }
+            },
+            "aws-sign2": {
+              "version": "0.7.0",
+              "bundled": true
+            },
+            "aws4": {
+              "version": "1.7.0",
+              "bundled": true
+            },
+            "bcrypt-pbkdf": {
+              "version": "1.0.1",
+              "bundled": true,
+              "optional": true,
+              "requires": {
+                "tweetnacl": "0.14.5"
+              }
+            },
+            "builtin-modules": {
+              "version": "1.1.1",
+              "bundled": true
+            },
+            "camelcase": {
+              "version": "2.1.1",
+              "bundled": true
+            },
+            "camelcase-keys": {
+              "version": "2.1.0",
+              "bundled": true,
+              "requires": {
+                "camelcase": "2.1.1",
+                "map-obj": "1.0.1"
+              }
+            },
+            "caseless": {
+              "version": "0.12.0",
+              "bundled": true
+            },
+            "chalk": {
+              "version": "1.1.3",
+              "bundled": true,
+              "requires": {
+                "ansi-styles": "2.2.1",
+                "escape-string-regexp": "1.0.5",
+                "has-ansi": "2.0.0",
+                "strip-ansi": "3.0.1",
+                "supports-color": "2.0.0"
+              }
+            },
+            "co": {
+              "version": "4.6.0",
+              "bundled": true
+            },
+            "combined-stream": {
+              "version": "1.0.6",
+              "bundled": true,
+              "requires": {
+                "delayed-stream": "1.0.0"
+              }
+            },
+            "core-util-is": {
+              "version": "1.0.2",
+              "bundled": true
+            },
+            "currently-unhandled": {
+              "version": "0.4.1",
+              "bundled": true,
+              "requires": {
+                "array-find-index": "1.0.2"
+              }
+            },
+            "dashdash": {
+              "version": "1.14.1",
+              "bundled": true,
+              "requires": {
+                "assert-plus": "1.0.0"
+              }
+            },
+            "decamelize": {
+              "version": "1.2.0",
+              "bundled": true
+            },
+            "delayed-stream": {
+              "version": "1.0.0",
+              "bundled": true
+            },
+            "ecc-jsbn": {
+              "version": "0.1.1",
+              "bundled": true,
+              "optional": true,
+              "requires": {
+                "jsbn": "0.1.1"
+              }
+            },
+            "error-ex": {
+              "version": "1.3.1",
+              "bundled": true,
+              "requires": {
+                "is-arrayish": "0.2.1"
+              }
+            },
+            "escape-string-regexp": {
+              "version": "1.0.5",
+              "bundled": true
+            },
+            "extend": {
+              "version": "3.0.1",
+              "bundled": true
+            },
+            "extsprintf": {
+              "version": "1.3.0",
+              "bundled": true
+            },
+            "fast-deep-equal": {
+              "version": "1.1.0",
+              "bundled": true
+            },
+            "fast-json-stable-stringify": {
+              "version": "2.0.0",
+              "bundled": true
+            },
+            "fd-slicer": {
+              "version": "1.0.1",
+              "bundled": true,
+              "requires": {
+                "pend": "1.2.0"
+              }
+            },
+            "find-up": {
+              "version": "1.1.2",
+              "bundled": true,
+              "requires": {
+                "path-exists": "2.1.0",
+                "pinkie-promise": "2.0.1"
+              }
+            },
+            "findit2": {
+              "version": "2.2.3",
+              "bundled": true
+            },
+            "foreachasync": {
+              "version": "3.0.0",
+              "bundled": true
+            },
+            "forever-agent": {
+              "version": "0.6.1",
+              "bundled": true
+            },
+            "form-data": {
+              "version": "2.3.2",
+              "bundled": true,
+              "requires": {
+                "asynckit": "0.4.0",
+                "combined-stream": "1.0.6",
+                "mime-types": "2.1.18"
+              }
+            },
+            "get-stdin": {
+              "version": "4.0.1",
+              "bundled": true
+            },
+            "getpass": {
+              "version": "0.1.7",
+              "bundled": true,
+              "requires": {
+                "assert-plus": "1.0.0"
+              }
+            },
+            "graceful-fs": {
+              "version": "4.1.11",
+              "bundled": true
+            },
+            "har-schema": {
+              "version": "2.0.0",
+              "bundled": true
+            },
+            "har-validator": {
+              "version": "5.0.3",
+              "bundled": true,
+              "requires": {
+                "ajv": "5.5.2",
+                "har-schema": "2.0.0"
+              }
+            },
+            "has-ansi": {
+              "version": "2.0.0",
+              "bundled": true,
+              "requires": {
+                "ansi-regex": "2.1.1"
+              }
+            },
+            "hosted-git-info": {
+              "version": "2.6.0",
+              "bundled": true
+            },
+            "http-signature": {
+              "version": "1.2.0",
+              "bundled": true,
+              "requires": {
+                "assert-plus": "1.0.0",
+                "jsprim": "1.4.1",
+                "sshpk": "1.14.2"
+              }
+            },
+            "indent-string": {
+              "version": "2.1.0",
+              "bundled": true,
+              "requires": {
+                "repeating": "2.0.1"
+              }
+            },
+            "is-arrayish": {
+              "version": "0.2.1",
+              "bundled": true
+            },
+            "is-builtin-module": {
+              "version": "1.0.0",
+              "bundled": true,
+              "requires": {
+                "builtin-modules": "1.1.1"
+              }
+            },
+            "is-finite": {
+              "version": "1.0.2",
+              "bundled": true,
+              "requires": {
+                "number-is-nan": "1.0.1"
+              }
+            },
+            "is-typedarray": {
+              "version": "1.0.0",
+              "bundled": true
+            },
+            "is-utf8": {
+              "version": "0.2.1",
+              "bundled": true
+            },
+            "isstream": {
+              "version": "0.1.2",
+              "bundled": true
+            },
+            "jsbn": {
+              "version": "0.1.1",
+              "bundled": true,
+              "optional": true
+            },
+            "json-schema": {
+              "version": "0.2.3",
+              "bundled": true
+            },
+            "json-schema-traverse": {
+              "version": "0.3.1",
+              "bundled": true
+            },
+            "json-stringify-safe": {
+              "version": "5.0.1",
+              "bundled": true
+            },
+            "jsprim": {
+              "version": "1.4.1",
+              "bundled": true,
+              "requires": {
+                "assert-plus": "1.0.0",
+                "extsprintf": "1.3.0",
+                "json-schema": "0.2.3",
+                "verror": "1.10.0"
+              }
+            },
+            "load-json-file": {
+              "version": "1.1.0",
+              "bundled": true,
+              "requires": {
+                "graceful-fs": "4.1.11",
+                "parse-json": "2.2.0",
+                "pify": "2.3.0",
+                "pinkie-promise": "2.0.1",
+                "strip-bom": "2.0.0"
+              }
+            },
+            "loud-rejection": {
+              "version": "1.6.0",
+              "bundled": true,
+              "requires": {
+                "currently-unhandled": "0.4.1",
+                "signal-exit": "3.0.2"
+              }
+            },
+            "map-obj": {
+              "version": "1.0.1",
+              "bundled": true
+            },
+            "meow": {
+              "version": "3.7.0",
+              "bundled": true,
+              "requires": {
+                "camelcase-keys": "2.1.0",
+                "decamelize": "1.2.0",
+                "loud-rejection": "1.6.0",
+                "map-obj": "1.0.1",
+                "minimist": "1.2.0",
+                "normalize-package-data": "2.4.0",
+                "object-assign": "4.1.1",
+                "read-pkg-up": "1.0.1",
+                "redent": "1.0.0",
+                "trim-newlines": "1.0.0"
+              }
+            },
+            "mime": {
+              "version": "1.2.11",
+              "bundled": true
+            },
+            "mime-db": {
+              "version": "1.33.0",
+              "bundled": true
+            },
+            "mime-types": {
+              "version": "2.1.18",
+              "bundled": true,
+              "requires": {
+                "mime-db": "1.33.0"
+              }
+            },
+            "minimist": {
+              "version": "1.2.0",
+              "bundled": true
+            },
+            "mkdirp": {
+              "version": "0.5.1",
+              "bundled": true,
+              "requires": {
+                "minimist": "0.0.8"
+              },
+              "dependencies": {
+                "minimist": {
+                  "version": "0.0.8",
+                  "bundled": true
+                }
+              }
+            },
+            "natives": {
+              "version": "1.1.4",
+              "bundled": true
+            },
+            "normalize-package-data": {
+              "version": "2.4.0",
+              "bundled": true,
+              "requires": {
+                "hosted-git-info": "2.6.0",
+                "is-builtin-module": "1.0.0",
+                "semver": "5.5.0",
+                "validate-npm-package-license": "3.0.3"
+              }
+            },
+            "number-is-nan": {
+              "version": "1.0.1",
+              "bundled": true
+            },
+            "oauth-sign": {
+              "version": "0.8.2",
+              "bundled": true
+            },
+            "object-assign": {
+              "version": "4.1.1",
+              "bundled": true
+            },
+            "parse-json": {
+              "version": "2.2.0",
+              "bundled": true,
+              "requires": {
+                "error-ex": "1.3.1"
+              }
+            },
+            "path-exists": {
+              "version": "2.1.0",
+              "bundled": true,
+              "requires": {
+                "pinkie-promise": "2.0.1"
+              }
+            },
+            "path-type": {
+              "version": "1.1.0",
+              "bundled": true,
+              "requires": {
+                "graceful-fs": "4.1.11",
+                "pify": "2.3.0",
+                "pinkie-promise": "2.0.1"
+              }
+            },
+            "pend": {
+              "version": "1.2.0",
+              "bundled": true
+            },
+            "performance-now": {
+              "version": "2.1.0",
+              "bundled": true
+            },
+            "pify": {
+              "version": "2.3.0",
+              "bundled": true
+            },
+            "pinkie": {
+              "version": "2.0.4",
+              "bundled": true
+            },
+            "pinkie-promise": {
+              "version": "2.0.1",
+              "bundled": true,
+              "requires": {
+                "pinkie": "2.0.4"
+              }
+            },
+            "punycode": {
+              "version": "1.4.1",
+              "bundled": true
+            },
+            "qs": {
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+        "yargs": {
+          "version": "3.10.0",
+          "bundled": true,
+          "optional": true,
+          "requires": {
+            "camelcase": "1.2.1",
+            "cliui": "2.1.0",
+            "decamelize": "1.2.0",
+            "window-size": "0.1.0"
+          },
+          "dependencies": {
+            "camelcase": {
+              "version": "1.2.1",
+              "bundled": true,
+              "optional": true
+            }
+          }
+        }
+      }
+    }
+  }
+}
diff --git a/sample/package.json b/sample/package.json
index 6f50ba2..cefc70b 100644
--- a/sample/package.json
+++ b/sample/package.json
@@ -9,12 +9,19 @@
   },
   "author": "",
   "license": "ISC",
+  "dependencies": {
+    "@auth0/component-cdn-uploader": "^2.0.0"
+  },
   "ccu": {
     "name": "lock",
     "cdn": "https://cdn.auth0.com",
     "mainBundleFile": "lock.min.js",
     "bucket": "hzalaz",
     "remoteBasePath": "js",
-    "snapshotName": "development"
+    "snapshotName": "development",
+    "digest": {
+      "hashes": ["sha384", "sha256"],
+      "extensions": [".js", ".css"]
+    }
   }
 }
diff --git a/sample/test-resources/lock.js b/sample/test-resources/lock.js
index e69de29..e906f5e 100644
--- a/sample/test-resources/lock.js
+++ b/sample/test-resources/lock.js
@@ -0,0 +1 @@
+function Random() {};
\ No newline at end of file
diff --git a/sample/test-resources/lock.js.sha256 b/sample/test-resources/lock.js.sha256
new file mode 100644
index 0000000..b65c21f
--- /dev/null
+++ b/sample/test-resources/lock.js.sha256
@@ -0,0 +1 @@
+qyoUQa4ZCWx7U1v8VSHnSV+v3+dzlR+Nl46OCPCYy5E=
\ No newline at end of file
diff --git a/sample/test-resources/lock.js.sha384 b/sample/test-resources/lock.js.sha384
new file mode 100644
index 0000000..d3ace46
--- /dev/null
+++ b/sample/test-resources/lock.js.sha384
@@ -0,0 +1 @@
+GIK71FW/lkngojLMWFGxR80Dd3Xgz75HiEwh5dp5crVGerwYNZFD8Cls+Jn4xFp4
\ No newline at end of file
diff --git a/sample/test-resources/lock.js.sha512 b/sample/test-resources/lock.js.sha512
new file mode 100644
index 0000000..d9be91f
--- /dev/null
+++ b/sample/test-resources/lock.js.sha512
@@ -0,0 +1 @@
+3SiT9eeqCENJLBv9k3Hh+cUN3sA5VAYjGRgJ1UQhlAnWLypBlYdAbqzZWGzvC2uwdKLIoIXpK7kvQZY8CyPgoQ==
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.map.sha256 b/sample/test-resources/lock.min.js.map.sha256
new file mode 100644
index 0000000..a53bce1
--- /dev/null
+++ b/sample/test-resources/lock.min.js.map.sha256
@@ -0,0 +1 @@
+47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.map.sha384 b/sample/test-resources/lock.min.js.map.sha384
new file mode 100644
index 0000000..de14a64
--- /dev/null
+++ b/sample/test-resources/lock.min.js.map.sha384
@@ -0,0 +1 @@
+OLBgp1GsljhM2TJ+sbHjaiH9txEUvgdDTAzHv2P24donTt6/529l+9Ua0vFImLlb
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.map.sha512 b/sample/test-resources/lock.min.js.map.sha512
new file mode 100644
index 0000000..28a3531
--- /dev/null
+++ b/sample/test-resources/lock.min.js.map.sha512
@@ -0,0 +1 @@
+z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.sha256 b/sample/test-resources/lock.min.js.sha256
new file mode 100644
index 0000000..a53bce1
--- /dev/null
+++ b/sample/test-resources/lock.min.js.sha256
@@ -0,0 +1 @@
+47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.sha384 b/sample/test-resources/lock.min.js.sha384
new file mode 100644
index 0000000..de14a64
--- /dev/null
+++ b/sample/test-resources/lock.min.js.sha384
@@ -0,0 +1 @@
+OLBgp1GsljhM2TJ+sbHjaiH9txEUvgdDTAzHv2P24donTt6/529l+9Ua0vFImLlb
\ No newline at end of file
diff --git a/sample/test-resources/lock.min.js.sha512 b/sample/test-resources/lock.min.js.sha512
new file mode 100644
index 0000000..28a3531
--- /dev/null
+++ b/sample/test-resources/lock.min.js.sha512
@@ -0,0 +1 @@
+z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
\ No newline at end of file
diff --git a/sample/test-resources/lock.sha256 b/sample/test-resources/lock.sha256
new file mode 100644
index 0000000..a53bce1
--- /dev/null
+++ b/sample/test-resources/lock.sha256
@@ -0,0 +1 @@
+47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=
\ No newline at end of file
diff --git a/sample/test-resources/lock.sha384 b/sample/test-resources/lock.sha384
new file mode 100644
index 0000000..de14a64
--- /dev/null
+++ b/sample/test-resources/lock.sha384
@@ -0,0 +1 @@
+OLBgp1GsljhM2TJ+sbHjaiH9txEUvgdDTAzHv2P24donTt6/529l+9Ua0vFImLlb
\ No newline at end of file
diff --git a/sample/test-resources/lock.sha512 b/sample/test-resources/lock.sha512
new file mode 100644
index 0000000..28a3531
--- /dev/null
+++ b/sample/test-resources/lock.sha512
@@ -0,0 +1 @@
+z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
\ No newline at end of file
diff --git a/sample/test-resources/vendor/underscore.js.sha256 b/sample/test-resources/vendor/underscore.js.sha256
new file mode 100644
index 0000000..a53bce1
--- /dev/null
+++ b/sample/test-resources/vendor/underscore.js.sha256
@@ -0,0 +1 @@
+47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=
\ No newline at end of file
diff --git a/sample/test-resources/vendor/underscore.js.sha384 b/sample/test-resources/vendor/underscore.js.sha384
new file mode 100644
index 0000000..de14a64
--- /dev/null
+++ b/sample/test-resources/vendor/underscore.js.sha384
@@ -0,0 +1 @@
+OLBgp1GsljhM2TJ+sbHjaiH9txEUvgdDTAzHv2P24donTt6/529l+9Ua0vFImLlb
\ No newline at end of file
diff --git a/sample/test-resources/vendor/underscore.js.sha512 b/sample/test-resources/vendor/underscore.js.sha512
new file mode 100644
index 0000000..28a3531
--- /dev/null
+++ b/sample/test-resources/vendor/underscore.js.sha512
@@ -0,0 +1 @@
+z4PhNX7vuL3xVChQ1m2AB9Yg5AULVxXcg/SpIdNs6c5H0NE8XYXysP+DGNKHfuwvY7kxvUdBeoGlODJ6+SfaPg==
\ No newline at end of file
diff --git a/test/configuration.test.js b/test/configuration.test.js
index 042291c..4c3e8dc 100644
--- a/test/configuration.test.js
+++ b/test/configuration.test.js
@@ -30,7 +30,9 @@ describe('configuration', function () {
       bucket: 'hzalaz',
       cdn: 'https://cdn.auth0.com',
       mainBundleFile: 'lock.min.js',
-      snapshotName: undefined
+      snapshotName: undefined,
+      hashes: [],
+      hashOnly: []
     });
   });
 
diff --git a/test/files.test.js b/test/files.test.js
new file mode 100644
index 0000000..34ca259
--- /dev/null
+++ b/test/files.test.js
@@ -0,0 +1,61 @@
+'use strict';
+
+var expect = require('chai').expect;
+var proxyrequire = require('proxyquire');
+var events = require('events');
+var Rx = require('rx');
+
+describe('files', function () {
+
+  var walker, emitter, files;
+
+  beforeEach(function () {
+    emitter = new events.EventEmitter();
+    walker = () => {
+      return emitter;
+    };
+
+    files = proxyrequire('../files', {'walk': {walk: walker}});
+  });
+
+  it('should return observable', function () {
+    expect(files.walk('build')).to.be.instanceOf(Rx.Observable);
+  });
+
+  const directory = 'auth0/build';
+
+  it('should emit found file', function (done) {
+    const walker = files.walk(directory);
+    walker
+    .doOnNext((value) => {
+      expect(value).to.equals(`${directory}/file.js`);
+      done();
+    })
+    .subscribe();
+    emitter.emit('file', directory, {name: 'file.js'}, () => {});
+    emitter.emit('end');
+  });
+
+  it('should complete on walker end', function (done) {
+    const walker = files.walk(directory);
+    walker
+    .doOnCompleted(() => {
+      done();
+    })
+    .subscribe();
+    emitter.emit('end');
+  });
+
+  it('should report walker error', function (done) {
+    const walker = files.walk(directory);
+    const error = new Error('MOCK');
+    walker
+    .doOnError((err) => {
+      expect(err).to.eql(error);
+      done();
+    })
+    .subscribe();
+    emitter.emit('error', directory, { error }, () => {});
+  });
+
+});
diff --git a/test/hash.test.js b/test/hash.test.js
new file mode 100644
index 0000000..7cb7bc4
--- /dev/null
+++ b/test/hash.test.js
@@ -0,0 +1,109 @@
+'use strict';
+
+const expect = require('chai').expect;
+const proxyrequire = require('proxyquire');
+const Rx = require('rx');
+const Logger = require('../logger');
+
+describe('hash', function () {
+
+  const logger = new Logger({logLevels: []});
+
+  it('should generate hash', function(done) {
+    const result = {file: 'file.js', method: 'sha256', value: 'hash1'};
+    const digest = () => Rx.Observable.just(result);
+    digest.available = ['sha256'];
+    const hash = proxyrequire('../hash', {
+      '../files': { walk: () => Rx.Observable.just('file.js') },
+      './digest': digest
+    });
+
+    hash({localPaths: ['build'], dry: true, logger, hashes: ['sha256'], hashOnly: []})
+    .doOnNext((value) => {
+      expect(value).to.eql(result);
+      done();
+    })
+    .subscribe();
+  });
+
+  it('should generate hash ignoring hash files', function(done) {
+    const digest = (p) => Rx.Observable.just({file: p, method: 'sha256', digest: 'hash1'});
+    digest.available = ['sha256'];
+    const hash = proxyrequire('../hash', {
+      '../files': { walk: () => Rx.Observable.from(['file.js', 'file.js.sha256']) },
+      './digest': digest
+    });
+
+    hash({localPaths: ['build'], dry: true, logger, hashes: ['sha256'], hashOnly: []})
+    .map((r) => r.file)
+    .toArray()
+    .doOnNext((value) => {
+      expect(value).to.eql(['file.js']);
+      done();
+    })
+    .subscribe();
+  });
+
+  it('should generate no hash by default', function(done) {
+    const digest = (p) => Rx.Observable.just({file: p, method: 'sha256', digest: 'hash1'});
+    digest.available = ['sha256'];
+    const hash = proxyrequire('../hash', {
+      '../files': { walk: () => Rx.Observable.from(['file.js', 'file.js.sha256']) },
+      './digest': digest
+    });
+
+    hash({localPaths: ['build'], dry: true, logger, hashes: [], hashOnly: []})
+    .map((r) => r.file)
+    .toArray()
+    .doOnNext((value) => {
+      expect(value).to.eql([]);
+      done();
+    })
+    .subscribe();
+  });
+
+  it('should generate hash ignoring specific files', function(done) {
+    const digest = (p) => Rx.Observable.just({file: p, method: 'sha256', digest: 'hash1'});
+    digest.available = ['sha256'];
+    const hash = proxyrequire('../hash', {
+      '../files': { walk: () => Rx.Observable.from(['file.js', 'file.css']) },
+      './digest': digest
+    });
+
+    hash({localPaths: ['build'], dry: true, logger, hashes: ['sha256'], hashOnly: ['.js']})
+    .map((r) => r.file)
+    .toArray()
+    .doOnNext((value) => {
+      expect(value).to.eql(['file.js']);
+      done();
+    })
+    .subscribe();
+  });
+
+  it('should write hash to file', function(done) {
+    var filePath, contents;
+    const result = {file: 'file.js', method: 'sha256', digest: 'hash1'};
+    const digest = () => Rx.Observable.just(result);
+    digest.available = ['sha256'];
+    const hash = proxyrequire('../hash', {
+      '../files': {
+        walk: () => Rx.Observable.just('file.js'),
+        write: (p, c) => {
+          filePath = p;
+          contents = c;
+        }
+      },
+      './digest': digest
+    });
+
+    hash({localPaths: ['build'], logger, hashes: ['sha256'], hashOnly: []})
+    .doOnNext((value) => {
+      expect(value).to.eql(result);
+      expect(filePath).to.eql('file.js.sha256');
+      expect(contents).to.eql('hash1');
+      done();
+    })
+    .subscribe();
+  });
+
+});
diff --git a/test/index.test.js b/test/index.test.js
index adcfd55..9574798 100644
--- a/test/index.test.js
+++ b/test/index.test.js
@@ -39,8 +39,11 @@ describe('uploader', function () {
         return Rx.Observable.just(false);
       };
     };
+    var hash = function () {
+      return Rx.Observable.just({});
+    };
 
-    var uploader = proxyrequire('../index', {'./aws': aws, './cdn': doesNotExist});
+    var uploader = proxyrequire('../index', {'./aws': aws, './cdn': doesNotExist, './hash': hash});
     options.snapshot = false;
     uploader(options);
   });