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742cecce08
* Groundwork for Poly1305 MAC * Implement fast reduction for Poly1305 * don't import assembly files when compiling without assembly
72 lines
2.3 KiB
Nim
72 lines
2.3 KiB
Nim
# Constantine
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# Copyright (c) 2018-2019 Status Research & Development GmbH
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# Copyright (c) 2020-Present Mamy André-Ratsimbazafy
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# Licensed and distributed under either of
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# * MIT license (license terms in the root directory or at http://opensource.org/licenses/MIT).
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# * Apache v2 license (license terms in the root directory or at http://www.apache.org/licenses/LICENSE-2.0).
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# at your option. This file may not be copied, modified, or distributed except according to those terms.
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# ############################################################
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#
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# Hash Function concept
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#
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# ############################################################
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type
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CryptoHash* = concept h, var ctx, type H
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## Interface of a cryptographic hash function
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##
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## - digestSizeInBytes is the hash output size in bytes
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## - internalBlockSize, in bits:
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## hash functions are supposed to ingest fixed block size
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## that are padded if necessary
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## - SHA256 block size is 64 bits
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## - SHA512 block size is 128 bits
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## - SHA3-512 block size is 72 bits
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# should we avoid int to avoid exception? But they are compile-time
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H.digestSize is static int
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H.internalBlockSize is static int
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# Context
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# -------------------------------------------
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# update/finish are not matching properly
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# type B = char or byte
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ctx.init()
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# ctx.update(openarray[B])
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# ctx.finish(var array[H.digestSize, byte])
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ctx.clear()
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func hash*[DigestSize: static int, T: char|byte](
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HashKind: type CryptoHash,
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digest: var array[DigestSize, byte],
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message: openarray[T],
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clearMem = false) =
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## Produce a digest from a message
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static: doAssert DigestSize == HashKind.type.digestSize
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mixin update, finish
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var ctx {.noInit.}: HashKind
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ctx.init()
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ctx.update(message)
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ctx.finish(digest)
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if clearMem:
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ctx.clear()
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func hash*[T: char|byte](
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HashKind: type CryptoHash,
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message: openarray[T],
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clearmem = false): array[HashKind.sizeInBytes, byte] {.noInit.} =
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## Produce a digest from a message
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HashKind.hash(result, message, clearMem)
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# Exports
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# -----------------------------------------------------------------------
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import ./hashes/h_sha256
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export h_sha256
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static: doAssert sha256 is CryptoHash
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