Simple CTR-cipher using HMAC SHA-512 only

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cryptography

Can anyone help with Javascript based code (Cryptojs or Nodejs may be used) for developing the following CTR-based simple HMAC SHA-512 cipher:

SALT: Current epoch
CTR: SALT-0, SALT-1, SALT-2...
OTPi: HMAC-SHA-512 of password with SALT-i as data, where i is 0 for block 1, 1 for block2 etc.
OTP (One time Pad): OTP0|OTP1|OTP2|... till length of plain-text
Cipher-text: base64(epoch-(plain-text-XOR-OTP)). Here "-" after epoch acts as separater.

Sample:
plain-text: I believe simple HMAC-SHA512 can be used as very strong cipher. The data part of the HMAC shall be treated as salt in Counter mode. The output blocks shall be concatenated to produce a one time pad to be XORed with plain-text.

SALT: 1234567890
password: pwd
cipher-text: MTIzNDU2Nzg5MC3ifryoed1W5zDwwQS6CnrvmsYG1BHKainyzgiyTEiXWtITRV5sU9iOJT2CXKue
ZFIS/Hs8lzEGMnUuMH07G9iLg/hv0aYZeSXerziJxPl/OjeCxtIfJsSrsi5EeDEL1AdUOAaawdM+
jN7M6YF0M3V/vmTvRqZT7Md6cyugaAleK2ZPlKeqnUYKr8kAD5lvZnQlPbqViXSasLeLOpUCK6yk
c3SUsTbf1k6aw0xbDqRie60GCEfkN6HREvIAkbicyLi0M+1IKnIB+12HKZdE60f/5G5XrZLmVsBL
yT3X3aTsCOX3