/usr/include/osp/osppkcs1.h is in libosptk3-dev 3.4.2-1.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*** COPYRIGHT (c) 2002 by TransNexus, Inc.                              ***
***                                                                     ***
*** This software is property of TransNexus, Inc.                       ***
*** This software is freely available under license from TransNexus.    ***
*** The license terms and conditions for free use of this software by   ***
*** third parties are defined in the OSP Toolkit Software License       ***
*** Agreement (LICENSE.txt).  Any use of this software by third         ***
*** parties, which does not comply with the terms and conditions of the ***
*** OSP Toolkit Software License Agreement is prohibited without        ***
*** the prior, express, written consent of TransNexus, Inc.             ***
***                                                                     ***
*** Thank you for using the OSP ToolKit(TM).  Please report any bugs,   ***
*** suggestions or feedback to support@transnexus.com                   ***
***                                                                     ***
**************************************************************************/
/*
 * osppkcs1.h - PKCS1 definitions used for key objects.
 */
#ifndef _OSP_PKCS1_H
#define _OSP_PKCS1_H
#include "osp/osp.h"
#include "osp/ospasn1.h"
#include "osp/ospdatatypes.h"
#define OSPC_ASN1_PRIVATEKEYINFO_VERSION 0
#ifdef __cplusplus
extern "C" 
{
#endif
    int
    OSPPPKCS1PrivateKeyDelete(
        OSPTPRIVATEKEY **ospvPrivateKey);
    int
    OSPPPKCS1PrivateKeyCreate(
        OSPTPRIVATEKEY *ospvSourcePrivateKey,
        OSPTPRIVATEKEY **ospvNewPrivateKey);
    int
    OSPPPKCS1PrivateKeyCopy(
        OSPTPRIVATEKEY *ospvDestinationPrivateKey,
        OSPTPRIVATEKEY *ospvSourcePrivateKey);
    int
    OSPPPKCS1PrivateKeyTestContext(
        OSPTPRIVATEKEY *ospvPrivateKey);
    int
    OSPPPKCS1Encrypt(
        OSPTASN1OBJECT **ospvEncryptedDigest,
        OSPTASN1OBJECT *ospvAlgorithmId,
        OSPTASN1OBJECT *ospvDigestInfo,
        OSPTPRIVATEKEY *ospvPrivateKey);
#ifdef __cplusplus
}
#endif
#endif
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