Convert a secp256k1 compressed public key to Tendermint/Cosmos based blockchain address (Golang)

publicKeyToAddress.go

package main

import (
  "fmt"
  "crypto/sha256"
  "golang.org/x/crypto/ripemd160"
  "encoding/base64"
  
  "github.com/cosmos/btcutil/bech32"
  
)

// PublicKeyToAddress converts secp256k1 public key to a bech32 Tendermint/Cosmos based address
func PublicKeyToAddress(addressPrefix, publicKeyString string) string {
  // Decode public key string
  pubKeyBytes := decodePublicKeyString(publicKeyString)

  // Hash pubKeyBytes as: RIPEMD160(SHA256(public_key_bytes))
	pubKeySha256Hash := sha256.Sum256(pubKeyBytes)
	ripemd160hash := ripemd160.New()
	ripemd160hash.Write(pubKeySha256Hash[:])
	addressBytes := ripemd160hash.Sum(nil)

  // Convert addressBytes into a bech32 string
	address := toBech32("hid", addressBytes)
  
	return address
}

// Code courtesy: https://github.com/cosmos/cosmos-sdk/blob/90c9c9a9eb4676d05d3f4b89d9a907bd3db8194f/types/bech32/bech32.go#L10
func toBech32(addrPrefix string, addrBytes []byte) string {
  converted, err := bech32.ConvertBits(addrBytes, 8, 5, true)
	if err != nil {
		panic(err)
	}

	addr, err := bech32.Encode(addrPrefix, converted)
  if err != nil {
    panic(err)
  }

  return addr
}

// decodePublicKeyString decodes a base-64 encoded public key
// into a Byte Array. The logic will differ for other string encodings
func decodePublicKeyString(pubKey string) []byte {
  pubKeyBytes, err := base64.StdEncoding.DecodeString(pubKey)
	if err != nil {
		panic(err)
	}

  return pubKeyBytes
}

func main() {
  inputPublicKey := "At8sTdbKdkdyvxi8FjLe4Dl9PYc+u19VMqCpmA7PBrPz"
  inputPrefix := "hid" // osmo - Osmosis | cosmos - Cosmos Hub | hid - Hypersign Identity Network

  bech32address := PublicKeyToAddress(inputPrefix, inputPublicKey)

  fmt.Println(bech32address) // hid18vux70nvs5ee0sfvqfjgt6rq5fd89asd7xaypj
}

This was an absolute life saver thank you! I only wish google had gotten me to it sooner!