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Ethereum: HMAC “Bitcoin Seed” for BIP32

In the world of cryptocurrency, understanding the underlying technology is essential for any serious investor or developer. One such technology is BIP32, the method used by Ethereum to generate a master private key from a seed. In this article, we will explore how Pybitcointools uses HMAC (Keyed-Hashing for Message Authentication) to calculate a Bitcoin Seed for BIP32.

What is BIP32?

BIP32 is a set of rules and interfaces that define how to generate a private key from a seed using the Ethereum blockchain. It allows users to encrypt a master private key, which can then be used to generate multiple public keys.

Pybitcointools and HMAC

Pybitcointools is a popular Python library for interacting with the Ethereum network. One of its functions is bip32_master_key, which takes two parameters: seed (the seed from which the master private key is created) and vbytes=MAINNET_PRIVATE. The function returns a bytes object representing the generated master private key.

HMAC Process

To calculate the Bitcoin Seed using HMAC, we need to follow these steps:

• Create an HMAC object: We use the hmac.new function to create an HMAC object with the given seed and input data (from_string_to_bytes(“Bitcoin Seed” in this case).

• Update the HMAC object: We update the HMAC object using the update method, passing in the remaining bytes from the input string “Bitcoin Seed”.

• Calculate the digest: Finally, we calculate the digest of the HMAC object using the digest method.

Putting it all together

Here is the Pybitcointools code that uses HMAC to calculate the Bitcoin Seed for BIP32:

def bip32_master_key(seed, vbytes=MAINNET_PRIVATE):
I = hmac.new(from_string_to_bytes("Bitcoin Seed"), digestmod=hashlib.sha512)
return I.digest()

Usage example

To use this function, simply call it with the seed and input data as arguments:

seed = b"your_seed_here"
digest = bip32_master_key(seed, vbytes=MAINNET_PRIVATE)
print(digest)

Note that from_string_to_bytes("Bitcoin Seed") is assumed to be a function that converts the string “Bitcoin Seed” to bytes. This function is not defined in this article.

Conclusion

In conclusion, Pybitcointools provides an efficient way to calculate the Bitcoin Seed for BIP32 using HMAC. By understanding how this process works and implementing it in your own code, you can gain deeper insight into the underlying Ethereum technology. Remember to always use secure coding practices and consider the possible security implications of generating private keys on the Ethereum network.

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feat: add Pybitcointools hmac implementation for BIP32

API Documentation

bip32_master_key(seed, vbytes=MAINNET_PRIVATE)
  - Parameters:
    seed (str): The seed from which the master private key is created.
    vbytes (int): byte version of the input string "Bitcoin Seed".

I hope this article helps! Let me know if you have any questions or need further clarification.

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