diff --git a/README.md b/README.md
index 6a49152..177bd48 100644
--- a/README.md
+++ b/README.md
@@ -137,6 +137,21 @@ x509.verify(
 
 ```
 
+#### x509.verifyFromStr(`certStr`, `caBundleStr`, function(err, result){ /*...*/})
+
+It is the same with verify.
+
+```js
+const x509 = require('x509');
+
+x509.verify(
+  path.readFileSync(__dirname + '/certs/user.com.crt'),
+  path.readFileSync(__dirname + 'enduser-example.com.chain'),
+  function(err, result){ /*...*/}
+);
+
+```
+
 ## Examples
 Checking the date to make sure the certificate is active:
 ```js
diff --git a/include/x509.h b/include/x509.h
index ce1198b..0eb05c1 100644
--- a/include/x509.h
+++ b/include/x509.h
@@ -24,9 +24,11 @@ NAN_METHOD(get_subject);
 NAN_METHOD(get_issuer);
 NAN_METHOD(parse_cert);
 NAN_METHOD(verify);
+NAN_METHOD(verify_from_str);
 
 Local<Value> try_parse(const std::string& dataString);
 Local<Value> verify(const std::string& dataString);
+Local<Value> verify_from_str(const std::string& dataString);
 Local<Value> parse_date(ASN1_TIME *date);
 Local<Value> parse_serial(ASN1_INTEGER *serial);
 Local<Object> parse_name(X509_NAME *subject);
diff --git a/index.js b/index.js
index 539a76c..35e1aff 100644
--- a/index.js
+++ b/index.js
@@ -6,6 +6,32 @@ exports.getAltNames = x509.getAltNames;
 exports.getSubject = x509.getSubject;
 exports.getIssuer = x509.getIssuer;
 
+exports.verifyFromStr = function(certStr, caBundleStr, cb) {
+  if (typeof cb !== 'function') {
+    throw new Error('cb should be function');
+  }
+  if (certStr instanceof Buffer) {
+    certStr = certStr.toString();
+  } else if (typeof certStr !== 'string') {
+    cb(new Error('certStr should be string or buffer'));
+    return;
+  }
+  if (caBundleStr instanceof Buffer) {
+    caBundleStr = caBundleStr.toString();
+  } else if (typeof caBundleStr !== 'string') {
+    cb(new Error('caBundleStr should be string or buffer'));
+    return;
+  }
+  var caughtErr = null;
+  try {
+    x509.verify_from_str(certStr, caBundleStr);
+  } catch (verificationError) {
+    caughtErr = verificationError;
+  } finally {
+    cb(caughtErr);
+  }
+};
+
 exports.verify = function(certPath, CABundlePath, cb) {
   if (!certPath) {
     throw new TypeError('Certificate path is required');
@@ -29,8 +55,7 @@ exports.verify = function(certPath, CABundlePath, cb) {
       try {
         x509.verify(certPath, CABundlePath);
         cb(null);
-      }
-      catch (verificationError) {
+      } catch (verificationError) {
         cb(verificationError);
       }
     });
diff --git a/src/addon.cc b/src/addon.cc
index f0aab0c..faf0a47 100644
--- a/src/addon.cc
+++ b/src/addon.cc
@@ -10,6 +10,10 @@ void init(Local<Object> exports) {
   Nan::Set(exports,
     Nan::New<String>("version").ToLocalChecked(),
     Nan::New<String>(VERSION).ToLocalChecked());
+  
+  Nan::Set(exports,
+    Nan::New<String>("verify_from_str").ToLocalChecked(),
+    Nan::New<FunctionTemplate>(verify_from_str)->GetFunction());
 
   Nan::Set(exports,
     Nan::New<String>("verify").ToLocalChecked(),
diff --git a/src/x509.cc b/src/x509.cc
index a836301..a6fdecf 100644
--- a/src/x509.cc
+++ b/src/x509.cc
@@ -46,7 +46,72 @@ std::string parse_args(const Nan::FunctionCallbackInfo<v8::Value>& info) {
   return *String::Utf8Value(info[0]->ToString());
 }
 
-
+NAN_METHOD(verify_from_str) {
+  Nan::HandleScope scope;
+  OpenSSL_add_all_algorithms();
+  std::string cert_str = *String::Utf8Value(info[0]->ToString());
+  std::string ca_str = *String::Utf8Value(info[1]->ToString());
+  
+  X509_STORE *store = NULL;
+  X509_STORE_CTX *verify_ctx = NULL;
+  X509 *ca_cert = NULL;
+  BIO *ca_bio = NULL;
+  X509 *cert = NULL;
+  BIO *cert_bio = NULL;
+  const char *error = NULL;
+  do {
+    store = X509_STORE_new();
+    if (store == NULL) {
+      error = "Failed to create X509 certificate store.";
+      break;
+    }
+    verify_ctx = X509_STORE_CTX_new();
+    if (verify_ctx == NULL) {
+      error = "Failed to create X509 verification context.";
+      break;
+    }
+    cert_bio = BIO_new(BIO_s_mem());
+    size_t ret = BIO_puts(cert_bio, cert_str.c_str());
+    if (ret != cert_str.length()) {
+      error = "Error reading cert content";
+      break;
+    }
+    cert = PEM_read_bio_X509(cert_bio, NULL, 0, NULL);
+    if (cert == NULL) {
+      error = "Failed to load cert";
+      break;
+    }
+    ca_bio = BIO_new(BIO_s_mem());
+    ret = BIO_puts(ca_bio, ca_str.c_str());
+    if (ret != ca_str.length()) {
+      error = "Error reading ca content";
+      break;
+    }
+    ca_cert = PEM_read_bio_X509(ca_bio, NULL, 0, NULL);
+    if (ca_cert == NULL) {
+      error = "Failed to load ca";
+      break;
+    }
+    X509_STORE_CTX_init(verify_ctx, store, ca_cert, NULL);
+    X509_STORE_add_cert(store, cert);
+    ret = X509_verify_cert(verify_ctx);
+    if (ret < 1) {
+      error =  X509_verify_cert_error_string(verify_ctx->error);
+      break;
+    }
+  } while(0);
+  X509_STORE_free(store);
+  X509_STORE_CTX_free(verify_ctx);
+  X509_free(ca_cert);
+  BIO_free_all(ca_bio);
+  X509_free(cert);
+  BIO_free_all(cert_bio);
+  if (error != NULL) {
+    Nan::ThrowError(error);
+  } else {
+    info.GetReturnValue().Set(Nan::New(true));
+  }
+}
 
 NAN_METHOD(verify) {
   Nan::HandleScope scope;
diff --git a/test/test.js b/test/test.js
index c98818d..2fb854c 100644
--- a/test/test.js
+++ b/test/test.js
@@ -53,4 +53,53 @@ x509.verify(
   function(err, result) {
     assert.throws(assert.ifError.bind(null, err), /Failed to load cert/)
   }
-);
\ No newline at end of file
+);
+
+x509.verifyFromStr(
+  fs.readFileSync(path.join(__dirname, 'certs/enduser-example.com.crt')),
+  fs.readFileSync(path.join(__dirname, 'CA_chains/enduser-example.com.chain')),
+  function(err, result) {
+    assert.strictEqual(err, null)
+  }
+);
+
+x509.verifyFromStr(
+  fs.readFileSync(path.join(__dirname, 'certs/acaline.com.crt')),
+  fs.readFileSync(path.join(__dirname, 'CA_chains/enduser-example.com.chain')),
+  function(err, result) {
+    assert.throws(assert.ifError.bind(null, err), /self signed certificate/)
+  }
+);
+
+x509.verifyFromStr(
+  fs.readFileSync(path.join(__dirname, 'test.js')),
+  fs.readFileSync(path.join(__dirname, 'CA_chains/enduser-example.com.chain')),
+  function(err, result) {
+    assert.throws(assert.ifError.bind(null, err), /Failed to load cert/)
+  }
+);
+
+x509.verifyFromStr(
+  fs.readFileSync(path.join(__dirname, 'certs/acaline.com.crt')),
+  fs.readFileSync(path.join(__dirname, 'test.js')),
+  function(err, result) {
+    assert.throws(assert.ifError.bind(null, err), /Failed to load ca/)
+  }
+);
+
+x509.verifyFromStr(
+  123456,
+  fs.readFileSync(path.join(__dirname, 'CA_chains/enduser-example.com.chain')),
+  function(err, result) {
+    assert.throws(assert.ifError.bind(null, err), /certStr should be string or buffer/)
+  }
+)
+
+try {
+  x509.verifyFromStr(
+    fs.readFileSync(path.join(__dirname, 'certs/acaline.com.crt')),
+    fs.readFileSync(path.join(__dirname, 'CA_chains/enduser-example.com.chain'))
+  )
+} catch (err) {
+  assert.throws(assert.ifError.bind(null, err), /cb should be function/)
+}
\ No newline at end of file