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Ethereum: HMAC Bitcoin Seed for BIP32
In the world of cryptocurrency, it is essential for any serious investor or developer to understand the underlying technology. One such technology is BIP32, the method used by Ethereum to generate a master private key from a seed. In this article, we will learn how Pybitcointools uses HMAC (Keyed-Hashing for Message Authentication) to calculate a BIP32 bitcoin seed.
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 requires two parameters: “seed” (the seed from which the master private key is generated) and “vbytes=MAINNET_PRIVATE”. The function returns a byte object representing the generated master private key.
HMAC Process
To calculate a Bitcoin seed using HMAC, we need to perform the following steps:
- Create HMAC Object: We use the
hmac.newfunction to create an HMAC object with the given initial and input data (from_string_to_bytes (in this case, “Bitcoin Seed”).
- Update HMAC Object: We update the HMAC object using the
updatemethod, passing in the remaining bytes of the input stringBitcoin Seed'.
- Calculate Digest: Finally, we calculate the digest of the HMAC object using thesummary
method.
To put it all together
Here is the Pybitcointools code that uses HMAC to calculate a BIP32 Bitcoin seed:
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 initial and input data as arguments:
seed = b"your_seed_here"
digest = bip32_master_key(seed, vbytes=MAINNET_PRIVATE)
print (summary)
Note that from_string_to_bytes(“Bitcoin Seed”)` should be a function that converts the string “Bitcoin Seed” to bytes. This function is not defined in this article.
Conclusion
In summary, Pybitcointools is an efficient way to calculate a Bitcoin seed in BIP32 using HMAC. By understanding how this process works and implementing it in your code, you can gain a deeper understanding of the underlying Ethereum technology. Remember to always use secure coding practices and consider the potential security implications of generating private keys on the Ethereum network.
Confirmation message
“Fat: Add Pybitcointools hmac implementation for BIP32”.
API documentation
bip32_master_key(seed, vbytes=MAINNET_PRIVATE)
– Settings:
seed (str): The seed from which the master private key is generated.
vbytes (int): The byte version of the Bitcoin Seed input string.
I hope this article was helpful to you! Feel free to contact me if you have any questions or need further clarification.