diff --git a/tst/Bootstrap.php b/tst/Bootstrap.php
index 1b423b29..4adfba35 100644
--- a/tst/Bootstrap.php
+++ b/tst/Bootstrap.php
@@ -1,6 +1,7 @@
 <?php
 
 use PrivateBin\Persistence\ServerSalt;
+use Eris\Generator;
 
 error_reporting(E_ALL | E_STRICT);
 
@@ -110,7 +111,7 @@ class Helper
     }
 
     /**
-     * get example paste
+     * get example paste as JSON
      *
      * @return array
      */
@@ -129,6 +130,68 @@ class Helper
         return json_encode($example);
     }
 
+    /**
+     * get paste generator
+     *
+     * @return array
+     */
+    public static function getPasteGenerator($meta = array(), $withAttachment = false)
+    {
+        $generatedMeta = array(
+            'salt'           => ServerSalt::generate(),
+            'formatter'      => Generator\elements('plaintext', 'syntaxhighlighting', 'markdown'),
+            'postdate'       => Generator\int(),
+            'opendiscussion' => Generator\elements(true, false),
+        );
+        $generatedMeta = array_merge($generatedMeta, $meta);
+        $example = array(
+            'data'      => Generator\associative(array(
+                'iv'    => Generator\vector(16, Generator\byte()),
+                'v'     => 1,
+                'iter'  => Generator\choose(100, 100000),
+                'ks'    => Generator\elements(128, 192, 256),
+                'ts'    => Generator\elements(64, 96, 128),
+                'mode'  => Generator\elements('ccm', 'ocb2', 'gcm'),
+                'adata' => Generator\string(),
+                'cipher'=> 'aes',
+                'salt'  => Generator\vector(8, Generator\byte()),
+                'ct'    => Generator\seq(Generator\byte()),
+            )),
+            'meta'               => Generator\associative($generatedMeta),
+        );
+        if ($withAttachment) {
+            $example['attachment'] = $example['attachmentname'] = $example['data'];
+        }
+        return Generator\associative($example);
+    }
+
+    /**
+     * get paste from generated random array
+     *
+     * @return array
+     */
+    public static function getPasteFromGeneratedArray($paste)
+    {
+        $paste['data']['iv'] = self::byteArray2Base64($paste['data']['iv']);
+        $paste['data']['salt'] = self::byteArray2Base64($paste['data']['salt']);
+        // deflate cipher text to maximize entropy
+        $paste['data']['ct'] = self::byteArray2Base64($paste['data']['ct'], true);
+        $paste['data'] = json_encode($paste['data']);
+        if (array_key_exists('attachment', $paste)) {
+            $paste['attachment']['iv'] = self::byteArray2Base64($paste['attachment']['iv']);
+            $paste['attachment']['salt'] = self::byteArray2Base64($paste['attachment']['salt']);
+            $paste['attachment']['ct'] = self::byteArray2Base64($paste['attachment']['ct'], true);
+            $paste['attachment'] = json_encode($paste['attachment']);
+        }
+        if (array_key_exists('attachmentname', $paste)) {
+            $paste['attachmentname']['iv'] = self::byteArray2Base64($paste['attachmentname']['iv']);
+            $paste['attachmentname']['salt'] = self::byteArray2Base64($paste['attachmentname']['salt']);
+            $paste['attachmentname']['ct'] = self::byteArray2Base64($paste['attachmentname']['ct'], true);
+            $paste['attachmentname'] = json_encode($paste['attachmentname']);
+        }
+        return $paste;
+    }
+
     /**
      * get example paste ID
      *
@@ -282,6 +345,24 @@ class Helper
         }
     }
 
+    /**
+     * get example paste ID
+     *
+     * @param array $bytes
+     * @return string
+     */
+    public static function byteArray2Base64($bytes, $deflate = false)
+    {
+        $string = implode(
+            array_map('chr', $bytes)
+        );
+        // optional deflate to maximize entropy
+        if ($deflate) {
+            $string = gzdeflate($string);
+        }
+        return base64_encode($string);
+    }
+
     /**
      * update all templates with the latest SRI hashes for all JS files
      *
diff --git a/tst/SjclTest.php b/tst/SjclTest.php
index 54cc30fc..37051d92 100644
--- a/tst/SjclTest.php
+++ b/tst/SjclTest.php
@@ -1,31 +1,89 @@
 <?php
 
 use PrivateBin\Sjcl;
+use Eris\Generator;
 
 class SjclTest extends PHPUnit_Framework_TestCase
 {
+    use Eris\TestTrait;
+
     public function testSjclValidatorValidatesCorrectly()
     {
-        $paste = Helper::getPasteWithAttachment();
-        $this->assertTrue(Sjcl::isValid($paste['data']), 'valid sjcl');
-        $this->assertTrue(Sjcl::isValid($paste['attachment']), 'valid sjcl');
-        $this->assertTrue(Sjcl::isValid($paste['attachmentname']), 'valid sjcl');
-        $this->assertTrue(Sjcl::isValid(Helper::getComment()['data']), 'valid sjcl');
+        $this->minimumEvaluationRatio(0.01)->forAll(
+            Helper::getPasteGenerator(array(), true),
+            Generator\string(),
+            Generator\string(),
+            Generator\choose(0,100)
+        )->then(
+            function ($pasteArray, $key, $value, $lowInt)
+            {
+                $paste = Helper::getPasteFromGeneratedArray($pasteArray);
+                $this->assertTrue(Sjcl::isValid($paste['data']), 'valid sjcl');
+                $this->assertTrue(Sjcl::isValid($paste['attachment']), 'valid sjcl');
+                $this->assertTrue(Sjcl::isValid($paste['attachmentname']), 'valid sjcl');
 
-        $this->assertTrue(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'valid sjcl');
-        $this->assertFalse(Sjcl::isValid('{"iv":"$","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid base64 encoding of iv');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"$","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid base64 encoding of salt');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"$"}'), 'invalid base64 encoding of ct');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"bm9kYXRhbm9kYXRhbm9kYXRhbm9kYXRhbm9kYXRhCg=="}'), 'low ct entropy');
-        $this->assertFalse(Sjcl::isValid('{"iv":"MTIzNDU2Nzg5MDEyMzQ1Njc4OTA=","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'iv to long');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"MTIzNDU2Nzg5MDEyMzQ1Njc4OTA=","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'salt to long');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA","foo":"MTIzNDU2Nzg5MDEyMzQ1Njc4OTA="}'), 'invalid additional key');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":0.9,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'unsupported version');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":100,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'not enough iterations');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":127,"ts":64,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid key size');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":63,"mode":"ccm","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid tag length');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"!#@","adata":"","cipher":"aes","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid mode');
-        $this->assertFalse(Sjcl::isValid('{"iv":"83Ax/OdUav3SanDW9dcQPg","v":1,"iter":1000,"ks":128,"ts":64,"mode":"ccm","adata":"","cipher":"!#@","salt":"Gx1vA2/gQ3U","ct":"j7ImByuE5xCqD2YXm6aSyA"}'), 'invalid cipher');
-        // @note adata is not validated, except as part of the total message length
+                // common error cases
+                $this->assertFalse(Sjcl::isValid($value), 'non-json data');
+
+                $sjclArray = json_decode($paste['data'], true);
+                $sjclError = $sjclArray;
+                $sjclError['iv'] = '$' . $value;
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid base64 encoding of iv');
+
+                $sjclError = $sjclArray;
+                $sjclError['salt'] = '$' . $value;
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid base64 encoding of salt');
+
+                $sjclError = $sjclArray;
+                $sjclError['ct'] = '$' . $value;
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid base64 encoding of ct');
+
+                $sjclError = $sjclArray;
+                $sjclError['ct'] = 'bm9kYXRhbm9kYXRhbm9kYXRhbm9kYXRhbm9kYXRhCg==';
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'low ct entropy');
+
+                $sjclError = $sjclArray;
+                $sjclError['iv'] = 'MTIzNDU2Nzg5MDEyMzQ1Njc4OTA=';
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'iv to long');
+
+                $sjclError = $sjclArray;
+                $sjclError['salt'] = 'MTIzNDU2Nzg5MDEyMzQ1Njc4OTA=';
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'salt to long');
+
+                $sjclError = $sjclArray;
+                $sjclError[$key] = $value;
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid additional key');
+
+                if (!in_array($key, array('1', 'ccm', 'ocb2', 'gcm', 'aes'))) {
+                    $sjclError = $sjclArray;
+                    $sjclError['v'] = $key;
+                    $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'unsupported version');
+
+                    $sjclError = $sjclArray;
+                    $sjclError['mode'] = $key;
+                    $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid mode');
+
+                    $sjclError = $sjclArray;
+                    $sjclError['cipher'] = $key;
+                    $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid cipher');
+                }
+
+                $sjclError = $sjclArray;
+                $sjclError['iter'] = $lowInt;
+                $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'not enough iterations');
+
+                if (!in_array($lowInt, array(64, 96))) {
+                    $sjclError = $sjclArray;
+                    $sjclError['ks'] = $lowInt;
+                    $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid key size');
+
+                    $sjclError = $sjclArray;
+                    $sjclError['ts'] = $lowInt;
+                    $this->assertFalse(Sjcl::isValid(json_encode($sjclError)), 'invalid authentication strength');
+                }
+                // @note adata is not validated, except as part of the total message length
+            }
+        );
+        $this->assertTrue(Sjcl::isValid(Helper::getComment()['data']), 'valid sjcl');
     }
 }