Kyrim Transfer API

				
					package main
import (
    "crypto/rand"
    "crypto/rsa"
    "crypto/sha256"
    "crypto/x509"
    "encoding/hex"
    "encoding/pem"
    "fmt"
    "time"
)
const privateKeyPem = `-----BEGIN PRIVATE KEY-----
your_private_key_pkcs8_pem
-----END PRIVATE KEY-----`
const clientUuid = "your_client_id"
func main() {
    // Format current time as ISO8601 without milliseconds
    timestamp := time.Now().UTC().Format("2006-01-02T15:04:05Z")
    // Create the string to sign
    stringToSign := clientUuid + "|" + timestamp
    // Decode the PEM formatted private key
    block, _ := pem.Decode([]byte(privateKeyPem))
    if block == nil {
        fmt.Println("failed to parse PEM block containing the key")
        return
    }
    // Parse the PKCS8 private key
    privateKey, err := x509.ParsePKCS8PrivateKey(block.Bytes)
    if err != nil {
        fmt.Printf("failed to parse PKCS8 private key: %s\n", err)
        return
    }
    rsaPrivateKey, ok := privateKey.(*rsa.PrivateKey)
    if !ok {
        fmt.Println("not an RSA private key")
        return
    }
    // Calculate SHA256 hash
    sha256Hash := sha256.New()
    sha256Hash.Write([]byte(stringToSign))
    hashed := sha256Hash.Sum(nil)
    // Sign the SHA256 hash with RSA private key
    signature, err := rsa.SignPKCS1v15(rand.Reader, rsaPrivateKey, crypto.SHA256, hashed)
    if err != nil {
        fmt.Printf("failed to sign: %s\n", err)
        return
    }
    // Encode the signature to hexadecimal
    signatureHex := hex.EncodeToString(signature)
    // Output the signature
    fmt.Println("Signature:", signatureHex)
}