some optimizations for sha1 hashing on OTRData
some optimizations for sha1 hashing on OTRData

eighthave/ChatSecureAndroid,anvayarai/my-ChatSecure,eighthave/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,n8fr8/AwesomeApp,10045125/ChatSecureAndroid,guardianproject/ChatSecureAndroid,bonashen/ChatSecureAndroid,bonashen/ChatSecureAndroid,anvayarai/my-ChatSecure,n8fr8/AwesomeApp,kden/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,h2ri/ChatSecureAndroid,n8fr8/ChatSecureAndroid,h2ri/ChatSecureAndroid,n8fr8/AwesomeApp,guardianproject/ChatSecureAndroid,joskarthic/chatsecure,kden/ChatSecureAndroid,h2ri/ChatSecureAndroid,eighthave/ChatSecureAndroid,joskarthic/chatsecure,n8fr8/ChatSecureAndroid,guardianproject/ChatSecureAndroid,prembasumatary/ChatSecureAndroid,n8fr8/ChatSecureAndroid,Heart2009/ChatSecureAndroid,joskarthic/chatsecure,Heart2009/ChatSecureAndroid,kden/ChatSecureAndroid,Heart2009/ChatSecureAndroid,bonashen/ChatSecureAndroid,10045125/ChatSecureAndroid,anvayarai/my-ChatSecure,10045125/ChatSecureAndroid