This article introduces how to change the length of SMS OTP password.

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Instructions

1. According to the document SMS OTP authentication using Web authentication , Netscaler generates a 6-digit random OTP passcode per user session and save it in the OTP store by configuring ns variable and ns assignment, the related configuration commands are as follows:
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add ns variable otp_store -type "map(text(65),text(6),100000)" -ifValueTooBig undef -ifNoValue undef -expires 5
add ns assignment generate_otp -variable "$otp_store[AAA.USER.SESSIONID]" -set ("000000" + SYS.RANDOM.MUL(1000000).TYPECAST_UNSIGNED_LONG_AT.TYPECAST_TEXT_T).SUFFIX(6)
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2. If we want to change the length of SMS OTP password, we need to modify the "Set Expression" of ns assignment and the "value length" of ns variable. Here are two examples： 
 
  【Example 1】If you want to change the length of SMS OTP passcode from 6-digit to 4-digit, please run below command in Netscaler CLI:
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    set ns assignment generate_otp -variable "$otp_store[AAA.USER.SESSIONID]" -set ("000000" + SYS.RANDOM.MUL(1000000).TYPECAST_UNSIGNED_LONG_AT.TYPECAST_TEXT_T).SUFFIX(4)
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  【Example 2】If you want to change the length of SMS OTP passcode from 6-digit to 8-digit, please run below command in Netscaler CLI:
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    set ns variable otp_store -type "map(text(65),text(8),100000)"
    set ns assignment generate_otp -set ("00000000" + SYS.RANDOM.MUL(100000000).TYPECAST_UNSIGNED_LONG_AT.TYPECAST_TEXT_T).SUFFIX(8)
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