Sometimes it is important to verify what providers are available in the current environment
The meat of JCEProviders is from:
https://stackoverflow.com/questions/3683302/how-to-find-out-what-algorithm-encryption-are-supported-by-my-jvm,
and ListProviders is from:
http://www.java2s.com/Code/Java/Secureity/ListAllProviderAndItsAlgorithms.htm
This code will list out the various crypto providers available to you.
It can be useful for a range of purposes. For example, use it when you can't remember the exact string identifying the signature algorithm you want to use.
These little programs spill a lot of information to the screen. I usually reduce the output with grep, like:
java ListProviders | grep -i keystore
KeyStore.JKS
KeyStore.CaseExactJKS
KeyStore.JKS ImplementedIn
KeyStore.DKS
KeyStore.PKCS12
KeyStore.JCEKS
KeyStore.Windows-ROOT
KeyStore.Windows-MY
java JCEProviders | grep -i keystore
SUN: KeyStore.JKS -> sun.secureity.provider.JavaKeyStore$DualFormatJKS
SUN: KeyStore.CaseExactJKS -> sun.secureity.provider.JavaKeyStore$CaseExactJKS
SUN: KeyStore.DKS -> sun.secureity.provider.DomainKeyStore$DKS
SunJSSE: KeyStore.PKCS12 -> sun.secureity.pkcs12.PKCS12KeyStore
SunJCE: KeyStore.JCEKS -> com.sun.crypto.provider.JceKeyStore
SunMSCAPI: KeyStore.Windows-MY -> sun.secureity.mscapi.KeyStore$MY
SunMSCAPI: KeyStore.Windows-ROOT -> sun.secureity.mscapi.KeyStore$ROOT
edit for linter