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I am working on a Bitcoin Wallet, i have public key but can't figure out how can i genrate xPub key from this.

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  • You can't. Perhaps you can ask a more specific question after reading more about BIP32?
    – Pieter Wuille
    Commented Dec 7, 2017 at 3:54
  • I also recommend to have a look into Andreas' book "Mastering Bitcoin" (2nd edition), where he explains in chapter 5, how HD wallets and BIP32 work. The book is somewhere online readable (I think it was even on Amazon, but there is the pre-release only, and has chapter 4 with wallets).
    – pebwindkraft
    Commented Dec 7, 2017 at 12:51

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The extended public key, xPub, consists of both a chaincode and the public key itself. These are effectively distinct from each other, you cannot generate the chain code from the public key or vice-versa. Normally they are both generated at the same time from a seed, but without the seed you cannot generate the same chain code.

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  • @TygaChristed please accept the answer if it satisfied your question, because otherwise it remains "unanswered" on the site :)
    – meshcollider
    Commented Dec 13, 2017 at 12:14

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