#!/bin/bash
PUBLIC_KEY='your_public_key'
PRIVATE_KEY='your_private_key'
POST_DATA='base64_post_string'
POST_SIGNATURE='tp+ZLmKm1/E83dIzUpx5ljcttP4='
# SIGNATURE is base64 encode result from sha1 binary hash from concatenate string ${PRIVATE_KEY}${POST_DATA}${PRIVATE_KEY}
SIGNATURE=$(echo -n "${PRIVATE_KEY}${POST_DATA}${PRIVATE_KEY}" | openssl dgst -binary -sha1 | base64)

if [ "x${POST_SIGNATURE}" == "x${SIGNATURE}" ]
then
echo "ok"
else
echo "invalid signature: ${POST_SIGNATURE} != ${SIGNATURE}"
fi


# POST_DATA in this example
# base64_post_string

# SIGNATURE in this example
# tp+ZLmKm1/E83dIzUpx5ljcttP4=

$sign = base64_encode( sha1( 
$private_key .  
$data . 
$private_key 
, 1 ));

LiqPay liqpay = new LiqPay(PUBLIC_KEY, PRIVATE_KEY);
String sign = liqpay.str_to_sign(
PRIVATE_KEY + 
$data +
PRIVATE_KEY
);    
System.out.println(sign);

liqpay = LiqPay(PUBLIC_KEY, PRIVATE_KEY)
sign = liqpay.str_to_sign(
PRIVATE_KEY +
$data +
PRIVATE_KEY
)

liqpay = Liqpay::Liqpay.new(
:public_key  => 'public_key',
:private_key => 'private_key'
)
sign = liqpay.str_to_sign(
PRIVATE_KEY + 
$data +
PRIVATE_KEY
)

Sign = liqpay:str_to_sign(
<<PRIVATE_KEY/binary,  
Data/binary,
PRIVATE_KEY/binary>>
).

var LiqPay = require('liqpay');
var liqpay = new LiqPay(public_key, private_key);
var sign = liqpay->str_to_sign(
PRIVATE_KEY +
data +
PRIVATE_KEY
);

my $liqpay = Liqpay->new($public_key,$private_key);
my $sign = $liqpay->str_to_sign(
PRIVATE_KEY + 
$data +
PRIVATE_KEY
);

var (
    publicKey     = "your_public_key"
    privateKey    = "your_private_key"
    postData      = "base64_post_string"
    postSignature = "tp+ZLmKm1/E83dIzUpx5ljcttP4="
)
    
hasher := sha1.New()
hasher.Write([]byte(privateKey + postData + privateKey))
sha := hasher.Sum(nil)

signature := base64.StdEncoding.EncodeToString(sha)

if postSignature == signature {
    fmt.Println("ok")
} else {
    fmt.Printf("invalid signature: %s != %s\n", postSignature, signature)
}