设计到的方法如下:
DigitalSign
init
getInstance
SignMsgByRelativePath
SignMsgByInputStream
signMsgByAbsolutePath
verifyMsgByInputSteam
verifyMsgByAbsolutePath
verifyMsgByRelativePath
encryptMsg
decodeMsg
getPriKeyByInputStream
getPriKeyByAbsolutePath
getPriKeyByRelativePath
getPubKeyByInputSteam
getPublicKey
getPriKey
sign
appendMap
verify
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