Uses of Class
java.security.MessageDigestSpi

Packages that use MessageDigestSpi 
Package Description
java.security
Extensible cryptographic service provider infrastructure (SPI) for using and defining services such as Certificates, Keys, KeyStores, MessageDigests, and Signatures.
org.apache.harmony.security.provider.crypto  
org.bouncycastle.jcajce.provider.digest  
org.conscrypt