LibItsSecurity_Functions.ttcn

/**
 *  @author   ETSI / STF481 / STF507/ STF517
 *  @version  $URL$
 *            $Id$
 *  @desc     Module containing functions for Security Protocol
 *  @copyright   ETSI Copyright Notification
 *               No part may be reproduced except as authorized by written permission.
 *               The copyright and the foregoing restriction extend to reproduction in all media.
 *               All rights reserved.
 *
 */
module LibItsSecurity_Functions {
    
    // Libcommon
    import from LibCommon_BasicTypesAndValues all;
    import from LibCommon_DataStrings all;

    // LibIts
    import from IEEE1609dot2BaseTypes language "ASN.1:1997" all;
    import from IEEE1609dot2 language "ASN.1:1997" all;
    import from EtsiTs103097Module language "ASN.1:1997" all;
    
    // LibItsCommon
    import from LibItsCommon_Functions all;
    import from LibItsCommon_TypesAndValues all;
    
    // LibItsSecurity
    import from LibItsSecurity_TypesAndValues all;
    import from LibItsSecurity_Templates all;
    import from LibItsSecurity_Pixits all;
    import from LibItsSecurity_TestSystem all;
    
    group helpersFunctions {
        
        /**
         * @desc    Produces a 256-bit (32-byte) hash value
         * @param   p_toBeHashedData Data to be used to calculate the hash value
         * @return  The hash value
         */
        function f_hashWithSha256(
                                  in octetstring p_toBeHashedData
        ) return Oct32 {
            return fx_hashWithSha256(p_toBeHashedData);
        } // End of function f_hashWithSha256
        
        /**
         * @desc    Produces a 384-bit (48-byte) hash value
         * @param   p_toBeHashedData Data to be used to calculate the hash value
         * @return  The hash value
         */
        function f_hashWithSha384(
                                  in octetstring p_toBeHashedData
        ) return Oct48 {
            return fx_hashWithSha384(p_toBeHashedData);
        } // End of function f_hashWithSha256
        
        /**
         * @desc    Produces a Elliptic Curve Digital Signature Algorithm (ECDSA) signaturee
         * @param   p_toBeSignedSecuredMessage    The data to be signed
         * @return  The signature value
         */
        function f_signWithEcdsaNistp256WithSha256(
                                                   in octetstring p_toBeSignedSecuredMessage,
                                                   in Oct32 p_privateKey
        ) runs on ItsSecurityBaseComponent return octetstring {
            return fx_signWithEcdsaNistp256WithSha256(
                p_toBeSignedSecuredMessage,
                p_privateKey
            );
            
        } // End of function f_signWithEcdsaNistp256WithSha256
        
        /**
         * @desc Compute the HashedId8 value from the hash value
         * @param p_hash The hash value
         * @return The HashedId8 value
         * @verdict
         */
        function f_HashedId8FromSha256(
                                       in Oct32 p_hash
        ) return HashedId8 {
            return substr(p_hash, lengthof(p_hash) - 8, 8);
        } // End of function f_HashedId8FromSha256
        
        /**
         * @desc Compute the HashedId3 value from the HashedId8 value
         * @param p_hashp_hashedId8 The HashedId8 value
         * @return The HashedId3 value
         * @verdict Unchanged
         */
        function f_HashedId3FromHashedId8(
                                          in HashedId8 p_hashedId8
        ) return HashedId3 {
            return substr(p_hashedId8, lengthof(p_hashedId8) - 3, 3);
        }  // End of function f_HashedId3FromHashedId8
        
        /**
         * @desc    Verify the signature of the specified data
         * @param   p_toBeVerifiedData          The data to be verified
         * @param   p_signature                 The signature
         * @param   p_ecdsaNistp256PublicKeyX   The public key (x coordinate)
         * @param   p_ecdsaNistp256PublicKeyY   The public key (y coordinate)
         * @return  true on success, false otherwise
         */
        function f_verifyWithEcdsaNistp256WithSha256(
                                                     in octetstring p_toBeVerifiedData,
                                                     in octetstring p_signature,
                                                     in octetstring p_ecdsaNistp256PublicKeyX,
                                                     in octetstring p_ecdsaNistp256PublicKeyY
        ) return boolean {
//            log("f_verifyWithEcdsaNistp256WithSha256: toBeVerifiedData", p_toBeVerifiedData);
//            log("f_verifyWithEcdsaNistp256WithSha256: toBeVerifiedData length", lengthof(p_toBeVerifiedData));
//            log("f_verifyWithEcdsaNistp256WithSha256: signature", p_signature);
//            log("f_verifyWithEcdsaNistp256WithSha256: ecdsaNistp256PublicKeyX", p_ecdsaNistp256PublicKeyX);
//            log("f_verifyWithEcdsaNistp256WithSha256: ecdsaNistp256PublicKeyY", p_ecdsaNistp256PublicKeyY);
            return fx_verifyWithEcdsaNistp256WithSha256(
                p_toBeVerifiedData,
                p_signature,
                p_ecdsaNistp256PublicKeyX,
                p_ecdsaNistp256PublicKeyY);
        } // End of function f_verifyWithEcdsaNistp256WithSha256
        
        /**
         * @desc    Produce a new public/private key pair based on Elliptic Curve Digital Signature Algorithm (ECDSA) algorithm.
         *          This function should not be used by the ATS
         * @param   p_privateKey    The new private key value
         * @param   p_publicKeyX    The new public key value (x coordinate)
         * @param   p_publicKeyX    The new public key value (y coordinate)
         * @return  true on success, false otherwise
         */
        function f_generate_key_pair(
                                     out octetstring p_privateKey,
                                     out octetstring p_publicKeyX,
                                     out octetstring p_publicKeyY
                                     ) return boolean {
          return fx_generateKeyPair(p_privateKey, p_publicKeyX, p_publicKeyY);
        }
        
        /**
        * @desc    Calculate digest over the certificate
        * @param   p_cert The certificate
        * @return  the HashedId8 value
        * @see Draft ETSI TS 103 097 V1.1.14 Clause 4.2.13   HashedId8
        */
        function f_calculateDigestFromCertificate(
                                                  in EtsiTs103097Certificate p_cert
        ) return HashedId8 {
            var octetstring v_toBeHashedData;
            var octetstring v_hash;
                        
            v_toBeHashedData := bit2oct(encvalue(p_cert));
            v_hash := f_hashWithSha256(v_toBeHashedData);
            return substr(v_hash, lengthof(v_hash) - 8, 8);
        } // End of function f_calculateDigestFromCertificate
        
        function f_duration2time(
                                 in Duration p_duration
        ) return UInt16 {
            if (ischosen(p_duration.seconds)) {
                return p_duration.seconds;
            } else if (ischosen(p_duration.minutes)) { 
                return p_duration.minutes;
            } else if (ischosen(p_duration.hours)) { 
                return p_duration.hours;
            } else if (ischosen(p_duration.sixtyHours)) {
                return p_duration.sixtyHours;
            } else if (ischosen(p_duration.years)) {
                return p_duration.years;
            }
            
            return 0; // Unrechable code
        } // End of function f_duration2time
        
        group hostSignatureHelpers {
            
            /**
            * @desc    Initialize [out] certificates according to the specified certificate name
            * @param   p_certificateName The certificate name to be used
            * @param   p_aaCertificate The AA certificate [out]
            * @param   p_atCertificate The AT certificate [out]
            * @return  true on succes, false otherwise
            * @see Draft ETSI TS 103 097 V1.1.14 Clause 4.2.13   HashedId8
            */
            function f_prepareCertificates(
                                           in template (omit) charstring p_certificateName,
                                           out EtsiTs103097Certificate p_aaCertificate,
                                           out EtsiTs103097Certificate p_atCertificate
            ) runs on ItsSecurityBaseComponent return boolean {
                
                // Load certificates if required
                if (/*Spirent change*/lengthof(p_certificateName)>0 and (valueof(p_certificateName) != cc_taCert_A)) {
                    if (f_readCertificate(valueof(p_certificateName), p_atCertificate) == false){
                        return false;
                    }
                    if (f_readCertificate(oct2str(p_atCertificate.toBeSigned.cracaId), p_aaCertificate) == false) {
                        return false;
                    }
                } else {
                    p_atCertificate := vc_atCertificate;
                    p_aaCertificate := vc_aaCertificate;