Properly bind private key to signature constructor
Properly bind private key to signature constructor

koto/end-to-end-1,google/end-to-end,kbsriram/end-to-end,diracdeltas/end-to-end-2,dconnolly/yahoo-end-to-end,atsuyim/end-to-end-1,postfix/end-to-end,Yiyuan17/end-to-end,rcchan/end-to-end,koto/end-to-end-1,rcchan/end-to-end,digideskio/end-to-end,microlv/end-to-end,dconnolly/google-end-to-end,dconnolly/yahoo-end-to-end,google/end-to-end,jprucnal/end-to-end,koto/end-to-end-1,yahoo/end-to-end,diracdeltas/end-to-end-2,chenhuang511/end-to-end,digideskio/end-to-end,atsuyim/end-to-end-1,Yiyuan17/end-to-end,atsuyim/end-to-end-1,postfix/end-to-end,adhintz/end-to-end,jprucnal/end-to-end,koto/end-to-end-1,digideskio/end-to-end,microlv/end-to-end,jw0201/end-to-end,postfix/end-to-end,sirdarckcat/end-to-end,atsuyim/end-to-end-1,yahoo/end-to-end,sirdarckcat/end-to-end,kaderud/end-to-end,sirdarckcat/end-to-end,kbsriram/end-to-end,dconnolly/yahoo-end-to-end,google/end-to-end,rcchan/end-to-end,yahoo/end-to-end,kaderud/end-to-end,Endika/end-to-end,diracdeltas/end-to-end-2,adhintz/end-to-end,dconnolly/google-end-to-end,kbsriram/end-to-end,jw0201/end-to-end,chenhuang511/end-to-end,dconnolly/yahoo-end-to-end,adhintz/end-to-end,jw0201/end-to-end,chenhuang511/end-to-end,google/end-to-end,kaderud/end-to-end,Endika/end-to-end,jprucnal/end-to-end,dconnolly/google-end-to-end,rcchan/end-to-end,dconnolly/google-end-to-end,yahoo/end-to-end,adhintz/end-to-end,Endika/end-to-end,jw0201/end-to-end,Endika/end-to-end,koto/end-to-end-1,chenhuang511/end-to-end,microlv/end-to-end,Endika/end-to-end,diracdeltas/end-to-end-2,Yiyuan17/end-to-end,digideskio/end-to-end,sirdarckcat/end-to-end,microlv/end-to-end,jprucnal/end-to-end,adhintz/end-to-end,kbsriram/end-to-end,sirdarckcat/end-to-end,postfix/end-to-end,google/end-to-end,Yiyuan17/end-to-end,kaderud/end-to-end,kbsriram/end-to-end