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fixes #4760

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This commit is contained in:
Andreas Rumpf
2016-09-13 17:20:53 +02:00
parent b78029b5af
commit 5f685bb0e6
1 changed files with 21 additions and 24 deletions
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45
lib/pure/securehash.nim
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@@ -15,30 +15,6 @@ type
Sha1Digest = array[0 .. Sha1DigestSize-1, uint8]
SecureHash* = distinct Sha1Digest
proc sha1(src: string) : Sha1Digest
proc secureHash*(str: string): SecureHash = SecureHash(sha1(str))
proc secureHashFile*(filename: string): SecureHash = secureHash(readFile(filename))
proc `$`*(self: SecureHash): string =
result = ""
for v in Sha1Digest(self):
result.add(toHex(int(v), 2))
proc parseSecureHash*(hash: string): SecureHash =
for i in 0.. <Sha1DigestSize:
Sha1Digest(result)[i] = uint8(parseHexInt(hash[i*2] & hash[i*2 + 1]))
proc `==`*(a, b: SecureHash): bool =
# Not a constant-time comparison, but that's acceptable in this context
Sha1Digest(a) == Sha1Digest(b)
when isMainModule:
let hash1 = secureHash("a93tgj0p34jagp9[agjp98ajrhp9aej]")
doAssert hash1 == hash1
doAssert parseSecureHash($hash1) == hash1
# Copyright (c) 2011, Micael Hildenborg
# All rights reserved.
#
@@ -196,3 +172,24 @@ template computeInternal(src: untyped) =
proc sha1(src: string) : Sha1Digest =
## Calculate SHA1 from input string
computeInternal(src)
proc secureHash*(str: string): SecureHash = SecureHash(sha1(str))
proc secureHashFile*(filename: string): SecureHash = secureHash(readFile(filename))
proc `$`*(self: SecureHash): string =
result = ""
for v in Sha1Digest(self):
result.add(toHex(int(v), 2))
proc parseSecureHash*(hash: string): SecureHash =
for i in 0.. <Sha1DigestSize:
Sha1Digest(result)[i] = uint8(parseHexInt(hash[i*2] & hash[i*2 + 1]))
proc `==`*(a, b: SecureHash): bool =
# Not a constant-time comparison, but that's acceptable in this context
Sha1Digest(a) == Sha1Digest(b)
when isMainModule:
let hash1 = secureHash("a93tgj0p34jagp9[agjp98ajrhp9aej]")
doAssert hash1 == hash1
doAssert parseSecureHash($hash1) == hash1