BIP 32 implemenration

[init1]

Hello!

Want to implement BIP32 tree generation from root seed 

1) Set root seed
2) Transform root seed with step N + 1
3) Generate pair of keys "private / public" based on seed "tail seed into BIP32 tree"

Could you please recommend some java open sources project for this aim ?
Could you please recommend online HD wallet "want to check my own implementation"?.

Which does BIP32 algorithm use for generate new seed in the tree ?

for example:
step 1 - root seed
step 2 - root seed step 2 - ?
step n - root seed step n - ?

BR!

[stuff0577]

You can use https://github.com/bitsofproof/supernode/blob/1.1/api/src/main/java/com/bitsofproof/supernode/api/ExtendedKey.java

Most web wallet use javascript bip32 like bitcore and bitcoinjs. You can also check pycoin.