Pad encryption keys with UTF-8 0 instead of \0 char

lib/gitlab/utils.rb

@@ -28,7 +28,7 @@ module Gitlab
         end
       end
 
-      truncated + ("\0" * (bytes - truncated.bytesize))
+      truncated + ('0' * (bytes - truncated.bytesize))
     end
 
     # Append path to host, making sure there's one single / in between

spec/config/settings_spec.rb

@@ -24,7 +24,7 @@ describe Settings do
 
       it 'expands db key base secret to 12 bytes' do
         expect(described_class.attr_encrypted_db_key_base_12)
-          .to eq(('a' * 10) + ("\0" * 2))
+          .to eq(('a' * 10) + ('0' * 2))
       end
     end
 
@@ -53,7 +53,7 @@ describe Settings do
       end
 
       it 'expands db key base secret to 32 bytes' do
-        expanded_key_base = ('a' * 10) + ("\0" * 22)
+        expanded_key_base = ('a' * 10) + ('0' * 22)
 
         expect(expanded_key_base.bytesize).to eq 32
         expect(described_class.attr_encrypted_db_key_base_32)
@@ -84,7 +84,7 @@ describe Settings do
       it 'does not use more than 32 bytes' do
         db_key_base = described_class.attr_encrypted_db_key_base_32
 
-        expect(db_key_base).to eq '❤❤❤❤❤❤' + ("\0" * 14)
+        expect(db_key_base).to eq '❤❤❤❤❤❤' + ('0' * 14)
         expect(db_key_base.bytesize).to eq 32
       end
     end
@@ -99,7 +99,7 @@ describe Settings do
       it 'does not use more than 32 bytes' do
         db_key_base = described_class.attr_encrypted_db_key_base_32
 
-        expect(db_key_base).to eq(('❤' * 10) + ("\0" * 2))
+        expect(db_key_base).to eq(('❤' * 10) + ('0' * 2))
         expect(db_key_base.bytesize).to eq 32
       end
     end

spec/lib/gitlab/utils_spec.rb

@@ -134,7 +134,7 @@ describe Gitlab::Utils do
         transformed = described_class.ensure_utf8_size('a' * 10, bytes: 32)
 
         expect(transformed.bytesize).to eq 32
-        expect(transformed).to eq(('a' * 10) + ("\0" * 22))
+        expect(transformed).to eq(('a' * 10) + ('0' * 22))
       end
     end
 
@@ -151,7 +151,7 @@ describe Gitlab::Utils do
       it 'backfills string with null characters' do
         transformed = described_class.ensure_utf8_size('❤' * 6, bytes: 32)
 
-        expect(transformed).to eq '❤❤❤❤❤❤' + ("\0" * 14)
+        expect(transformed).to eq '❤❤❤❤❤❤' + ('0' * 14)
         expect(transformed.bytesize).to eq 32
       end
     end
@@ -160,7 +160,7 @@ describe Gitlab::Utils do
       it 'truncates string to 32 characters and backfills it if needed' do
         transformed = described_class.ensure_utf8_size('❤' * 18, bytes: 32)
 
-        expect(transformed).to eq(('❤' * 10) + ("\0" * 2))
+        expect(transformed).to eq(('❤' * 10) + ('0' * 2))
         expect(transformed.bytesize).to eq 32
       end
     end