question: public byte [ ] generate160BitHashId ( ) throws CryptoException { try { DERBitString publicKeyBitString = encodePublicKeyAsBitString ( publicKey ) ; return DigestUtil . getMessageDigest ( publicKeyBitString . getBytes ( ) , DigestType . SHA1 ) ; } catch ( IOException ex ) { throw new CryptoException ( res . getString ( "NoGenerateKeyIdentifier.exception.message" ) , ex ) ; } }
target:  Generate 160 bit hash key identifier.