golang 使用RSA签名和验签

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import (
    "crypto/rsa"
    "crypto/rand"
)
signature, err := rsa.SignPKCS1v15(rand.Reader, privateKey.(*rsa.PrivateKey), crypto.SHA1, hash[:])
if err != nil {
    fmt.Printf("Error from signing: %s\n", err)
    return "", err
}
encoded := base64.StdEncoding.EncodeToString(signature)

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import (
    "crypto/rsa"
)
 
rsa.VerifyPKCS1v15(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte) error