@Override
    public String toString() {
        final StringBuilder sb = new StringBuilder("OpenSSLRSAPrivateKey{");

        ensureReadParams();
        sb.append("modulus=");
        sb.append(modulus.toString(16));

        return sb.toString();
    }
Wraps the provided private key for use in the TLS/SSL stack only. Sign/decrypt operations
using the key will be delegated to the {@code Signature}/{@code Cipher} implementation of the
provider which accepts the key.
common/src/main/java/org/conscrypt/OpenSSLRSAPrivateKey.java