47 lines
1.4 KiB
Nim
47 lines
1.4 KiB
Nim
# Nim-WebRTC
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# Copyright (c) 2023 Status Research & Development GmbH
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# Licensed under either of
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# * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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# * MIT license ([LICENSE-MIT](LICENSE-MIT))
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# at your option.
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# This file may not be copied, modified, or distributed except according to
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# those terms.
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import std/sha1, sequtils, typetraits, std/md5
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proc createCrc32Table(): array[0..255, uint32] =
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for i in 0..255:
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var rem = i.uint32
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for j in 0..7:
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if (rem and 1) > 0: rem = (rem shr 1) xor 0xedb88320'u32
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else: rem = rem shr 1
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result[i] = rem
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proc crc32*(s: seq[byte]): uint32 =
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const crc32table = createCrc32Table()
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result = 0xffffffff'u32
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for c in s:
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result = (result shr 8) xor crc32table[(result and 0xff) xor c]
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result = not result
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proc hmacSha1*(key: seq[byte], msg: seq[byte]): seq[byte] =
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let
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keyPadded =
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if len(key) > 64:
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@(secureHash(key.mapIt(it.chr)).distinctBase)
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elif key.len() < 64:
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key.concat(newSeq[byte](64 - key.len()))
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else:
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key
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innerHash = keyPadded.
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mapIt(it xor 0x36'u8).
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concat(msg).
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mapIt(it.chr).
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secureHash()
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outerHash = keyPadded.
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mapIt(it xor 0x5c'u8).
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concat(@(innerHash.distinctBase)).
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mapIt(it.chr).
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secureHash()
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return @(outerHash.distinctBase)
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