594 lines
24 KiB
Nim
594 lines
24 KiB
Nim
## Nim-Libp2p
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## Copyright (c) 2018 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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## This module implements MultiHash.
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## Supported hashes are:
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## 1. IDENTITY
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## 2. SHA2-256/SHA2-512
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## 3. DBL-SHA2-256
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## 4. SHA3/KECCAK
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## 5. SHAKE-128/SHAKE-256
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## 6. BLAKE2s/BLAKE2s
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## 7. SHA1
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##
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## Hashes which are not yet supported
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## 1. SKEIN
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## 2. MURMUR
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{.push raises: [Defect].}
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import tables
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import nimcrypto/[sha, sha2, keccak, blake2, hash, utils]
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import varint, vbuffer, multicodec, multibase
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import stew/base58
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import stew/results
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export results
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# This is workaround for Nim `import` bug.
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export sha, sha2, keccak, blake2, hash, utils
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const
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MaxHashSize* = 128
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ErrIncorrectName = "Incorrect hash name"
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ErrNotSupported = "Hash not supported"
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ErrWrongDigestSize = "Incorrect digest size"
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ErrDecodeError = "Decoding error from bytes"
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ErrParseError = "Parse error fromHex"
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type
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MHashCoderProc* = proc(data: openArray[byte],
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output: var openArray[byte]) {.nimcall, gcsafe, noSideEffect, raises: [Defect].}
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MHash* = object
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mcodec*: MultiCodec
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size*: int
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coder*: MHashCoderProc
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MultiHash* = object
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data*: VBuffer
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mcodec*: MultiCodec
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size*: int
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dpos*: int
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MhResult*[T] = Result[T, cstring]
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proc identhash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var length = if len(data) > len(output): len(output)
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else: len(data)
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copyMem(addr output[0], unsafeAddr data[0], length)
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proc sha1hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha1.digest(data)
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var length = if sha1.sizeDigest > len(output): len(output)
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else: sha1.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc dblsha2_256hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest1 = sha256.digest(data)
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var digest2 = sha256.digest(digest1.data)
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var length = if sha256.sizeDigest > len(output): len(output)
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else: sha256.sizeDigest
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copyMem(addr output[0], addr digest2.data[0], length)
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proc blake2Bhash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = blake2_512.digest(data)
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var length = if blake2_512.sizeDigest > len(output): len(output)
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else: blake2_512.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc blake2Shash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = blake2_256.digest(data)
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var length = if blake2_256.sizeDigest > len(output): len(output)
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else: blake2_256.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha2_256hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha256.digest(data)
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var length = if sha256.sizeDigest > len(output): len(output)
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else: sha256.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha2_512hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha512.digest(data)
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var length = if sha512.sizeDigest > len(output): len(output)
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else: sha512.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha3_224hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha3_224.digest(data)
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var length = if sha3_224.sizeDigest > len(output): len(output)
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else: sha3_224.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha3_256hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha3_256.digest(data)
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var length = if sha3_256.sizeDigest > len(output): len(output)
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else: sha3_256.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha3_384hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha3_384.digest(data)
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var length = if sha3_384.sizeDigest > len(output): len(output)
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else: sha3_384.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc sha3_512hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = sha3_512.digest(data)
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var length = if sha3_512.sizeDigest > len(output): len(output)
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else: sha3_512.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc keccak_224hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = keccak224.digest(data)
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var length = if keccak224.sizeDigest > len(output): len(output)
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else: keccak224.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc keccak_256hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = keccak256.digest(data)
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var length = if keccak256.sizeDigest > len(output): len(output)
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else: keccak256.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc keccak_384hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = keccak384.digest(data)
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var length = if keccak384.sizeDigest > len(output): len(output)
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else: keccak384.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc keccak_512hash(data: openArray[byte], output: var openArray[byte]) =
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if len(output) > 0:
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var digest = keccak512.digest(data)
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var length = if keccak512.sizeDigest > len(output): len(output)
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else: keccak512.sizeDigest
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copyMem(addr output[0], addr digest.data[0], length)
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proc shake_128hash(data: openArray[byte], output: var openArray[byte]) =
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var sctx: shake128
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if len(output) > 0:
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sctx.init()
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sctx.update(cast[ptr uint8](unsafeAddr data[0]), uint(len(data)))
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sctx.xof()
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discard sctx.output(addr output[0], uint(len(output)))
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sctx.clear()
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proc shake_256hash(data: openArray[byte], output: var openArray[byte]) =
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var sctx: shake256
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if len(output) > 0:
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sctx.init()
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sctx.update(cast[ptr uint8](unsafeAddr data[0]), uint(len(data)))
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sctx.xof()
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discard sctx.output(addr output[0], uint(len(output)))
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sctx.clear()
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const
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HashesList = [
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MHash(mcodec: multiCodec("identity"), size: 0,
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coder: identhash),
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MHash(mcodec: multiCodec("sha1"), size: sha1.sizeDigest,
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coder: sha1hash),
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MHash(mcodec: multiCodec("dbl-sha2-256"), size: sha256.sizeDigest,
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coder: dblsha2_256hash
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),
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MHash(mcodec: multiCodec("sha2-256"), size: sha256.sizeDigest,
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coder: sha2_256hash
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),
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MHash(mcodec: multiCodec("sha2-512"), size: sha512.sizeDigest,
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coder: sha2_512hash
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),
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MHash(mcodec: multiCodec("sha3-224"), size: sha3_224.sizeDigest,
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coder: sha3_224hash
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),
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MHash(mcodec: multiCodec("sha3-256"), size: sha3_256.sizeDigest,
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coder: sha3_256hash
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),
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MHash(mcodec: multiCodec("sha3-384"), size: sha3_384.sizeDigest,
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coder: sha3_384hash
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),
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MHash(mcodec: multiCodec("sha3-512"), size: sha3_512.sizeDigest,
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coder: sha3_512hash
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),
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MHash(mcodec: multiCodec("shake-128"), size: 32, coder: shake_128hash),
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MHash(mcodec: multiCodec("shake-256"), size: 64, coder: shake_256hash),
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MHash(mcodec: multiCodec("keccak-224"), size: keccak224.sizeDigest,
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coder: keccak_224hash
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),
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MHash(mcodec: multiCodec("keccak-256"), size: keccak256.sizeDigest,
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coder: keccak_256hash
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),
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MHash(mcodec: multiCodec("keccak-384"), size: keccak384.sizeDigest,
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coder: keccak_384hash
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),
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MHash(mcodec: multiCodec("keccak-512"), size: keccak512.sizeDigest,
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coder: keccak_512hash
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),
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MHash(mcodec: multiCodec("blake2b-8"), size: 1, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-16"), size: 2, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-24"), size: 3, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-32"), size: 4, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-40"), size: 5, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-48"), size: 6, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-56"), size: 7, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-64"), size: 8, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-72"), size: 9, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-80"), size: 10, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-88"), size: 11, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-96"), size: 12, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-104"), size: 13, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-112"), size: 14, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-120"), size: 15, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-128"), size: 16, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-136"), size: 17, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-144"), size: 18, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-152"), size: 19, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-160"), size: 20, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-168"), size: 21, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-176"), size: 22, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-184"), size: 23, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-192"), size: 24, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-200"), size: 25, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-208"), size: 26, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-216"), size: 27, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-224"), size: 28, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-232"), size: 29, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-240"), size: 30, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-248"), size: 31, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-256"), size: 32, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-264"), size: 33, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-272"), size: 34, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-280"), size: 35, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-288"), size: 36, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-296"), size: 37, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-304"), size: 38, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-312"), size: 39, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-320"), size: 40, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-328"), size: 41, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-336"), size: 42, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-344"), size: 43, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-352"), size: 44, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-360"), size: 45, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-368"), size: 46, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-376"), size: 47, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-384"), size: 48, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-392"), size: 49, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-400"), size: 50, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-408"), size: 51, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-416"), size: 52, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-424"), size: 53, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-432"), size: 54, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-440"), size: 55, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-448"), size: 56, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-456"), size: 57, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-464"), size: 58, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-472"), size: 59, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-480"), size: 60, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-488"), size: 61, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-496"), size: 62, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-504"), size: 63, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2b-512"), size: 64, coder: blake2Bhash),
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MHash(mcodec: multiCodec("blake2s-8"), size: 1, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-16"), size: 2, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-24"), size: 3, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-32"), size: 4, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-40"), size: 5, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-48"), size: 6, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-56"), size: 7, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-64"), size: 8, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-72"), size: 9, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-80"), size: 10, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-88"), size: 11, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-96"), size: 12, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-104"), size: 13, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-112"), size: 14, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-120"), size: 15, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-128"), size: 16, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-136"), size: 17, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-144"), size: 18, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-152"), size: 19, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-160"), size: 20, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-168"), size: 21, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-176"), size: 22, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-184"), size: 23, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-192"), size: 24, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-200"), size: 25, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-208"), size: 26, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-216"), size: 27, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-224"), size: 28, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-232"), size: 29, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-240"), size: 30, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-248"), size: 31, coder: blake2Shash),
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MHash(mcodec: multiCodec("blake2s-256"), size: 32, coder: blake2Shash)
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]
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proc initMultiHashCodeTable(): Table[MultiCodec, MHash] {.compileTime.} =
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for item in HashesList:
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result[item.mcodec] = item
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const
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CodeHashes = initMultiHashCodeTable()
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proc digestImplWithHash(hash: MHash, data: openArray[byte]): MultiHash =
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var buffer: array[MaxHashSize, byte]
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result.data = initVBuffer()
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result.mcodec = hash.mcodec
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result.data.write(hash.mcodec)
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if hash.size == 0:
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result.data.writeVarint(uint(len(data)))
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result.dpos = len(result.data.buffer)
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result.data.writeArray(data)
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result.size = len(data)
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else:
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result.data.writeVarint(uint(hash.size))
|
|
result.dpos = len(result.data.buffer)
|
|
hash.coder(data, buffer.toOpenArray(0, hash.size - 1))
|
|
result.data.writeArray(buffer.toOpenArray(0, hash.size - 1))
|
|
result.size = hash.size
|
|
result.data.finish()
|
|
|
|
proc digestImplWithoutHash(hash: MHash, data: openArray[byte]): MultiHash =
|
|
result.data = initVBuffer()
|
|
result.mcodec = hash.mcodec
|
|
result.size = len(data)
|
|
result.data.write(hash.mcodec)
|
|
result.data.writeVarint(uint(len(data)))
|
|
result.dpos = len(result.data.buffer)
|
|
result.data.writeArray(data)
|
|
result.data.finish()
|
|
|
|
proc digest*(mhtype: typedesc[MultiHash], hashname: string,
|
|
data: openArray[byte]): MhResult[MultiHash] {.inline.} =
|
|
## Perform digest calculation using hash algorithm with name ``hashname`` on
|
|
## data array ``data``.
|
|
let mc = MultiCodec.codec(hashname)
|
|
if mc == InvalidMultiCodec:
|
|
err(ErrIncorrectName)
|
|
else:
|
|
let hash = CodeHashes.getOrDefault(mc)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
else:
|
|
ok(digestImplWithHash(hash, data))
|
|
|
|
proc digest*(mhtype: typedesc[MultiHash], hashcode: int,
|
|
data: openArray[byte]): MhResult[MultiHash] {.inline.} =
|
|
## Perform digest calculation using hash algorithm with code ``hashcode`` on
|
|
## data array ``data``.
|
|
let hash = CodeHashes.getOrDefault(hashcode)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
else:
|
|
ok(digestImplWithHash(hash, data))
|
|
|
|
proc init*[T](mhtype: typedesc[MultiHash], hashname: string,
|
|
mdigest: MDigest[T]): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from nimcrypto's `MDigest` object and hash algorithm name
|
|
## ``hashname``.
|
|
let mc = MultiCodec.codec(hashname)
|
|
if mc == InvalidMultiCodec:
|
|
err(ErrIncorrectName)
|
|
else:
|
|
let hash = CodeHashes.getOrDefault(mc)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
elif hash.size != len(mdigest.data):
|
|
err(ErrWrongDigestSize)
|
|
else:
|
|
ok(digestImplWithoutHash(hash, mdigest.data))
|
|
|
|
proc init*[T](mhtype: typedesc[MultiHash], hashcode: MultiCodec,
|
|
mdigest: MDigest[T]): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from nimcrypto's `MDigest` and hash algorithm code
|
|
## ``hashcode``.
|
|
let hash = CodeHashes.getOrDefault(hashcode)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
elif (hash.size != 0) and (hash.size != len(mdigest.data)):
|
|
err(ErrWrongDigestSize)
|
|
else:
|
|
ok(digestImplWithoutHash(hash, mdigest.data))
|
|
|
|
proc init*(mhtype: typedesc[MultiHash], hashname: string,
|
|
bdigest: openArray[byte]): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from array of bytes ``bdigest`` and hash algorithm code
|
|
## ``hashcode``.
|
|
let mc = MultiCodec.codec(hashname)
|
|
if mc == InvalidMultiCodec:
|
|
err(ErrIncorrectName)
|
|
else:
|
|
let hash = CodeHashes.getOrDefault(mc)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
elif (hash.size != 0) and (hash.size != len(bdigest)):
|
|
err(ErrWrongDigestSize)
|
|
else:
|
|
ok(digestImplWithoutHash(hash, bdigest))
|
|
|
|
proc init*(mhtype: typedesc[MultiHash], hashcode: MultiCodec,
|
|
bdigest: openArray[byte]): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from array of bytes ``bdigest`` and hash algorithm code
|
|
## ``hashcode``.
|
|
let hash = CodeHashes.getOrDefault(hashcode)
|
|
if isNil(hash.coder):
|
|
err(ErrNotSupported)
|
|
elif (hash.size != 0) and (hash.size != len(bdigest)):
|
|
err(ErrWrongDigestSize)
|
|
else:
|
|
ok(digestImplWithoutHash(hash, bdigest))
|
|
|
|
proc decode*(mhtype: typedesc[MultiHash], data: openArray[byte],
|
|
mhash: var MultiHash): MhResult[int] =
|
|
## Decode MultiHash value from array of bytes ``data``.
|
|
##
|
|
## On success decoded MultiHash will be stored into ``mhash`` and number of
|
|
## bytes consumed will be returned.
|
|
##
|
|
## On error ``-1`` will be returned.
|
|
var code, size: uint64
|
|
var res, dpos: int
|
|
if len(data) < 2:
|
|
return err(ErrDecodeError)
|
|
|
|
var vb = initVBuffer(data)
|
|
if vb.isEmpty():
|
|
return err(ErrDecodeError)
|
|
|
|
res = vb.readVarint(code)
|
|
if res == -1:
|
|
return err(ErrDecodeError)
|
|
|
|
dpos += res
|
|
res = vb.readVarint(size)
|
|
if res == -1:
|
|
return err(ErrDecodeError)
|
|
|
|
dpos += res
|
|
if size > 0x7FFF_FFFF'u64:
|
|
return err(ErrDecodeError)
|
|
|
|
let hash = CodeHashes.getOrDefault(MultiCodec(code))
|
|
if isNil(hash.coder):
|
|
return err(ErrDecodeError)
|
|
|
|
if (hash.size != 0) and (hash.size != int(size)):
|
|
return err(ErrDecodeError)
|
|
|
|
if not vb.isEnough(int(size)):
|
|
return err(ErrDecodeError)
|
|
|
|
mhash = ? MultiHash.init(MultiCodec(code),
|
|
vb.buffer.toOpenArray(vb.offset,
|
|
vb.offset + int(size) - 1))
|
|
ok(vb.offset + int(size))
|
|
|
|
proc validate*(mhtype: typedesc[MultiHash], data: openArray[byte]): bool =
|
|
## Returns ``true`` if array of bytes ``data`` has correct MultiHash inside.
|
|
var code, size: uint64
|
|
var res: VarintResult[void]
|
|
if len(data) < 2:
|
|
return false
|
|
let last = data.high
|
|
var offset = 0
|
|
var length = 0
|
|
res = LP.getUVarint(data.toOpenArray(offset, last), length, code)
|
|
if res.isErr():
|
|
return false
|
|
offset += length
|
|
if offset >= len(data):
|
|
return false
|
|
res = LP.getUVarint(data.toOpenArray(offset, last), length, size)
|
|
if res.isErr():
|
|
return false
|
|
offset += length
|
|
if size > 0x7FFF_FFFF'u64:
|
|
return false
|
|
let hash = CodeHashes.getOrDefault(cast[MultiCodec](code))
|
|
if isNil(hash.coder):
|
|
return false
|
|
if (hash.size != 0) and (hash.size != int(size)):
|
|
return false
|
|
if offset + int(size) > len(data):
|
|
return false
|
|
result = true
|
|
|
|
proc init*(mhtype: typedesc[MultiHash],
|
|
data: openArray[byte]): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from bytes array ``data``.
|
|
var hash: MultiHash
|
|
discard ? MultiHash.decode(data, hash)
|
|
ok(hash)
|
|
|
|
proc init*(mhtype: typedesc[MultiHash], data: string): MhResult[MultiHash] {.inline.} =
|
|
## Create MultiHash from hexadecimal string representation ``data``.
|
|
var hash: MultiHash
|
|
try:
|
|
discard ? MultiHash.decode(fromHex(data), hash)
|
|
ok(hash)
|
|
except ValueError:
|
|
err(ErrParseError)
|
|
|
|
proc init58*(mhtype: typedesc[MultiHash],
|
|
data: string): MultiHash {.inline.} =
|
|
## Create MultiHash from BASE58 encoded string representation ``data``.
|
|
if MultiHash.decode(Base58.decode(data), result) == -1:
|
|
raise newException(MultihashError, "Incorrect MultiHash binary format")
|
|
|
|
proc cmp(a: openArray[byte], b: openArray[byte]): bool {.inline.} =
|
|
if len(a) != len(b):
|
|
return false
|
|
var n = len(a)
|
|
var res, diff: int
|
|
while n > 0:
|
|
dec(n)
|
|
diff = int(a[n]) - int(b[n])
|
|
res = (res and -not(diff)) or diff
|
|
result = (res == 0)
|
|
|
|
proc `==`*[T](mh: MultiHash, mdigest: MDigest[T]): bool =
|
|
## Compares MultiHash with nimcrypto's MDigest[T], returns ``true`` if
|
|
## hashes are equal, ``false`` otherwise.
|
|
if mh.dpos == 0:
|
|
return false
|
|
if len(mdigest.data) != mh.size:
|
|
return false
|
|
result = cmp(mh.data.buffer.toOpenArray(mh.dpos, mh.dpos + mh.size - 1),
|
|
mdigest.data.toOpenArray(0, mdigest.data.high))
|
|
|
|
proc `==`*[T](mdigest: MDigest[T], mh: MultiHash): bool {.inline.} =
|
|
## Compares MultiHash with nimcrypto's MDigest[T], returns ``true`` if
|
|
## hashes are equal, ``false`` otherwise.
|
|
result = `==`(mh, mdigest)
|
|
|
|
proc `==`*(a: MultiHash, b: MultiHash): bool =
|
|
## Compares MultiHashes ``a`` and ``b``, returns ``true`` if hashes are equal,
|
|
## ``false`` otherwise.
|
|
if a.dpos == 0 and b.dpos == 0:
|
|
return true
|
|
if a.mcodec != b.mcodec:
|
|
return false
|
|
if a.size != b.size:
|
|
return false
|
|
result = cmp(a.data.buffer.toOpenArray(a.dpos, a.dpos + a.size - 1),
|
|
b.data.buffer.toOpenArray(b.dpos, b.dpos + b.size - 1))
|
|
|
|
proc hex*(value: MultiHash): string =
|
|
## Return hexadecimal string representation of MultiHash ``value``.
|
|
result = $(value.data)
|
|
|
|
proc base58*(value: MultiHash): string =
|
|
## Return Base58 encoded string representation of MultiHash ``value``.
|
|
result = Base58.encode(value.data.buffer)
|
|
|
|
proc `$`*(mh: MultiHash): string =
|
|
## Return string representation of MultiHash ``value``.
|
|
let digest = toHex(mh.data.buffer.toOpenArray(mh.dpos,
|
|
mh.dpos + mh.size - 1))
|
|
result = $(mh.mcodec) & "/" & digest
|
|
|
|
proc write*(vb: var VBuffer, mh: MultiHash) {.inline.} =
|
|
## Write MultiHash value ``mh`` to buffer ``vb``.
|
|
vb.writeArray(mh.data.buffer)
|
|
|
|
proc encode*(mbtype: typedesc[MultiBase], encoding: string,
|
|
mh: MultiHash): string {.inline.} =
|
|
## Get MultiBase encoded representation of ``mh`` using encoding
|
|
## ``encoding``.
|
|
result = MultiBase.encode(encoding, mh.data.buffer)
|