D:\IBM>java DigitalSignature1Example "This is a test!"

SUN (DSA key/parameter generation; DSA signing; SHA-1, MD5 digests
; SecureRandom; X.509 certificates; JKS keystore; PKIX CertPathValidator
; PKIX CertPathBuilder; LDAP, Collection CertStores)

Digest:
D647dbdek12*e,ad.?e

Start generating RSA key
Finish generating RSA key

BouncyCastle Security Provider v1.12

Start encryption
Finish encryption:
Akjsdfp-9q8237nrcas-9de8fn239-4rb[*[OPOsjkdfJDL:JF;lkjs;ldj

Start decryption
Finish decryption:
iNdf6D213$dcd(ndz!0)

Start signature verification
Signature verified