Here are ABAP program so you can use to generate Solman Key :

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*&———————————————————————*
*& Report ZSLMKEY *
*& *
*&———————————————————————*
*& *
*& *
*&———————————————————————*

*&———————————————————————*
*& Report ZSLMKEY
*&
*&———————————————————————*
*&
*&
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REPORT ZSLMKEY.

types: begin of dswpclientkey,
INSTNO type num10,
DBID(3),
BUNDLE_ID(8),
SERVICE_KEY(40),
end of dswpclientkey.
*data: dswpclientkey_w type standard table of dswpclientkey.
DATA: P_VALUE(10),
P_INSTNO(10).

PARAMETERS: P_SID(3),
P_SYSNO(2),
P_SERVER(15).

START-OF-SELECTION.
PERFORM GET_SP_VALUE USING P_SID
P_SYSNO
P_SERVER
P_INSTNO
CHANGING P_VALUE.

END-OF-SELECTION.
WRITE P_VALUE.
*&———————————————————————*
*& Form get_sp_value
*&———————————————————————*
* text
*———————————————————————-*
* –>P_PF_SID text
* –>P_PF_SYSNO text
* –>P_PF_SERVER text
* <–P_PF_VALUE text
*———————————————————————-*
FORM get_sp_value USING P_PF_SID
P_PF_SYSNO
P_PF_SERVER
P_PF_INSTNO
CHANGING P_PF_VALUE.

CONSTANTS: lc_part_len TYPE i VALUE 5,
lc_pw_len TYPE i VALUE 10,
lc_allowed_chars(38) TYPE c VALUE
‘-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_’.

data: lf_string(20) type c,
lf_key type i,
ls_key type dswpclientkey,
lf_part(lc_part_len) type c,
lf_finalf(lc_pw_len) type c,
lf_finalx type xstring,
lf_xbuffer type xstring,
lf_opf(10) type c,
lf_langu like sy-langu,
lf_subrc like sy-subrc,
lf_len type i,
lo_conv_to_x TYPE REF TO cl_abap_conv_out_ce.

clear: lf_string, lf_finalx, lf_opf.

concatenate p_pf_sid p_pf_sysno p_pf_server into lf_string.

* Large letters only
translate lf_string to upper case.

lf_langu = sy-langu.
SET LOCALE LANGUAGE ‘E’.
lo_conv_to_x = cl_abap_conv_out_ce=>create( encoding = ‘1100’ ).
lf_len = STRLEN( lf_string ).

IF lf_string(lf_len) CN lc_allowed_chars.
else.

* Fold the input string to a lc_part_len long string
WHILE lf_len > 0.
lf_part = lf_string(lc_part_len).
SHIFT lf_string BY lc_part_len PLACES.
lf_len = STRLEN( lf_string ).
CALL METHOD lo_conv_to_x->reset.
CALL METHOD lo_conv_to_x->write( data = lf_part n = -1 ).
lf_xbuffer = lo_conv_to_x->get_buffer( ).
lf_finalx = lf_finalx BIT-XOR lf_xbuffer.
ENDWHILE.

lf_key = 12.

PERFORM scramble USING lf_finalx
lf_key
lc_part_len
CHANGING lf_finalf
lf_subrc.

if not lf_finalf is initial.
p_pf_value = lf_finalf.
ls_key-dbid = p_pf_sid.
ls_key-instno = p_pf_instno.
ls_key-bundle_id = ‘SM_KEY’.
ls_key-service_key = lf_finalf.
if not p_pf_instno is initial.
* insert dswpclientkey_w from ls_key.
if sy-subrc <> 0.
* update dswpclientkey_w from ls_key.
endif.
endif.
else.
clear p_pf_value.
endif.
endif.
ENDFORM. ” get_sp_value
*&———————————————————————*
*& Form scramble
*&———————————————————————*
* text
*———————————————————————-*
* –>P_LF_FINALX text
* –>P_LF_KEY text
* –>P_LC_PART_LEN text
* <–P_LF_finalf text
* <–P_LF_SUBRC text
*———————————————————————-*
FORM scramble USING iv_xstring TYPE xstring
iv_key TYPE i
iv_src_len TYPE i
CHANGING lf_finalf
lf_subrc LIKE sy-subrc.

CONSTANTS: lc_max_len TYPE i VALUE 20,
lc_mask(4) TYPE x VALUE ‘0000003F’,
lc_random(64) TYPE x VALUE
‘F0ED53B83244F1F876C67959FD4F13A2’ &
‘C15195EC5483C234774943A27DE26596’ &
‘5E5398789A17A33CD383A8B829FBDCA5′ &
’55D702778413ACDDF9B83116610E6DFA’.

DATA: lv_key_index(4) TYPE x,
lv_rand_index(4) TYPE x,
lv_xkey(4) TYPE x,
lv_xkey_shl_1(4) TYPE x,
lv_xkey_shr_5(4) TYPE x,
lv_scramble_byte TYPE x,
lv_dest(lc_max_len) TYPE x,
lv_index TYPE i,
lv_len TYPE i.

CLEAR lf_subrc.

IF iv_src_len EQ 0. EXIT. ENDIF.
lv_len = XSTRLEN( iv_xstring ).
IF iv_src_len GT lc_max_len OR
iv_src_len GT lv_len.
lf_subrc = 2.
EXIT.
ENDIF.

lv_xkey = iv_key.
lv_xkey_shl_1 = iv_key * 2.
lv_xkey_shr_5 = iv_key DIV 32.
lv_rand_index = lv_xkey BIT-XOR lv_xkey_shr_5 BIT-XOR lv_xkey_shl_1.
lv_rand_index = lv_rand_index BIT-AND lc_mask.

lv_index = 0.
DO iv_src_len TIMES.
CATCH SYSTEM-EXCEPTIONS compute_int_times_overflow = 1.
lv_key_index = ( iv_key * lv_index * lv_index ) – lv_index.
ENDCATCH.
IF sy-subrc <> 0.
lf_subrc = 1.
EXIT.
ENDIF.
lv_scramble_byte = lc_random+lv_rand_index(1) BIT-XOR
lv_key_index+3(1).
lv_dest+lv_index(1) = iv_xstring+lv_index(1) BIT-XOR
lv_scramble_byte.
lv_index = lv_index + 1.
lv_rand_index = lv_rand_index + 1.
lv_rand_index = lv_rand_index BIT-AND lc_mask.
ENDDO.
IF lf_subrc <> 0.
EXIT.
ENDIF.

WRITE lv_dest(iv_src_len) TO lf_finalf.

ENDFORM. ” scramble

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Note : You need ABAP/SAP system to write and run it