dual ec prng backdoor poc

DOC：docs.md

Usage: run the main method in DualEcPrngBackdoorPoc.java.

depends on : bouncycastle

demo output (with random seed)

e 5ccbc088080e9e9bf384de837662bcdfbece6b4c41f5b3ce88268f844c40cf25
ri f079737c7ba1e17b1b2d3881b0b7e1ac5c18bb580173458f53951a5ff0ad1330
currentRandom(ti) 2C78CAEDAD6AFC58B59CD38DECB3D45B755904E635C185BAB84862CCDC65A967
currentRandom240(ti) CAEDAD6AFC58B59CD38DECB3D45B755904E635C185BAB84862CCDC65A967
nextPoint (473f7a57818d99378c05b7d7851368f785fdaabca5e9370617c75b8de196a331,776fbc4577e20079a5751b1a64ba4ee34703c17aa90c0b317601d7d84cbd711e,1,ffffffff00000001000000000000000000000000fffffffffffffffffffffffc)
process 0/256
process 1/256
...
process 43/256
process 44/256
hit!
predict nextPoint 1:(473f7a57818d99378c05b7d7851368f785fdaabca5e9370617c75b8de196a331,889043b9881dff875a8ae4e59b45b11cb8fc3e8656f3f4ce89fe2827b3428ee1,1,ffffffff00000001000000000000000000000000fffffffffffffffffffffffc)
predict nextPoint 2:(473f7a57818d99378c05b7d7851368f785fdaabca5e9370617c75b8de196a331,776fbc4577e20079a5751b1a64ba4ee34703c17aa90c0b317601d7d84cbd711e,1,ffffffff00000001000000000000000000000000fffffffffffffffffffffffc)
predict success!

Process finished with exit code 0