You can invoke these programs using JCL, see below. For example:
// Create an Importer key using Diffi-Hellman with Private and Public keys.
// SET PR='-private ECCB512Z '
// SET PU='-public MYPUB '
/*
// SET TYPE='I'
//ISTEST EXEC PGM=GAESXDH,REGION=0M,
// PARM='-key AESDH&TYPE. -replace y -type &TYPE &PR &PU'
//STEPLIB DD DISP=SHR,DSN=COLIN.LOAD
//SYSPRINT DD SYSOUT=*,DCB=(LRECL=200)
//SYSOUT DD SYSOUT=*
//SYSERR DD SYSOUT=*
See