33 lines
1.6 KiB
Nim
33 lines
1.6 KiB
Nim
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## Nim-LibP2P
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## Copyright (c) 2020 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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# https://tools.ietf.org/html/rfc5869
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import math
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import nimcrypto
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import bearssl
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type
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BearHKDFContext {.importc: "br_hkdf_context", header: "bearssl_kdf.h".} = object
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HKDFResult*[len: static int] = array[len, byte]
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proc br_hkdf_init(ctx: ptr BearHKDFContext; hashClass: ptr HashClass; salt: pointer; len: csize) {.importc: "br_hkdf_init", header: "bearssl_kdf.h".}
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proc br_hkdf_inject(ctx: ptr BearHKDFContext; ikm: pointer; len: csize) {.importc: "br_hkdf_inject", header: "bearssl_kdf.h".}
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proc br_hkdf_flip(ctx: ptr BearHKDFContext) {.importc: "br_hkdf_flip", header: "bearssl_kdf.h".}
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proc br_hkdf_produce(ctx: ptr BearHKDFContext; info: pointer; infoLen: csize; output: pointer; outputLen: csize) {.importc: "br_hkdf_produce", header: "bearssl_kdf.h".}
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proc hkdf*[T: sha256; len: static int](_: type[T]; salt, ikm, info: openarray[byte]; outputs: var openarray[HKDFResult[len]]) =
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var
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ctx: BearHKDFContext
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br_hkdf_init(addr ctx, addr sha256Vtable, if salt.len > 0: unsafeaddr salt[0] else: nil, salt.len)
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br_hkdf_inject(addr ctx, if ikm.len > 0: unsafeaddr ikm[0] else: nil, ikm.len)
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br_hkdf_flip(addr ctx)
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for i in 0..outputs.high:
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br_hkdf_produce(addr ctx, if info.len > 0: unsafeaddr info[0] else: nil, info.len, addr outputs[i][0], outputs[i].len)
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