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uuid5 #28761

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merged 6 commits into from Sep 26, 2018
Merged

uuid5 #28761

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@@ -7,6 +7,7 @@ DocTestSetup = :(using UUIDs, Random)
```@docs
UUIDs.uuid1
UUIDs.uuid4
UUIDs.uuid5
UUIDs.uuid_version
```

@@ -4,7 +4,9 @@ module UUIDs

using Random

export UUID, uuid1, uuid4, uuid_version
import SHA

export UUID, uuid1, uuid4, uuid5, uuid_version

import Base: UUID

@@ -81,4 +83,34 @@ function uuid4(rng::AbstractRNG=Random.GLOBAL_RNG)
UUID(u)
end

"""
uuid5(ns::UUID, name::String) -> UUID
Generates a version 5 (namespace and domain-based) universally unique identifier (UUID),
as specified by RFC 4122.
# Examples
```jldoctest
julia> rng = MersenneTwister(1234);
julia> u4 = uuid4(rng)
UUID("196f2941-2d58-45ba-9f13-43a2532b2fa8")
julia> u5 = uuid5(u4, "julia")
UUID("6f461186-52d8-5fc1-993a-77a729165b65")
```
"""
function uuid5(ns::UUID, name::String)
hash_result = SHA.sha1(string(ns,name))
# set version number to 5
hash_result[7] = (hash_result[7] & 0x0F) | (0x50)
hash_result[9] = (hash_result[9] & 0x3F) | (0x80)
v = zero(UInt128)
#use only the first 16 bytes of the SHA1 hash
for idx in Base.OneTo(16)
This conversation was marked as resolved by matbesancon

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@ararslan

ararslan Aug 19, 2018

Member

Why not just 1:16?

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@matbesancon

matbesancon Aug 20, 2018

Author Contributor

OneTo is generally, in some applications lots of UUIDs can get generated.
I'll build a benchmark if the argument is needed

v = (v << 0x08) | hash_result[idx]
end
return UUID(v)
end

end
@@ -4,12 +4,16 @@ using Test, UUIDs, Random

u1 = uuid1()
u4 = uuid4()
u5 = uuid5(u1, "julia")
@test uuid_version(u1) == 1
@test uuid_version(u4) == 4
@test uuid_version(u5) == 5
@test u1 == UUID(string(u1)) == UUID(GenericString(string(u1)))
@test u4 == UUID(string(u4)) == UUID(GenericString(string(u4)))
@test u5 == UUID(string(u5)) == UUID(GenericString(string(u5)))
@test u1 == UUID(UInt128(u1))
@test u4 == UUID(UInt128(u4))
@test u5 == UUID(UInt128(u5))
@test uuid4(MersenneTwister(0)) == uuid4(MersenneTwister(0))
@test_throws ArgumentError UUID("550e8400e29b-41d4-a716-446655440000")
@test_throws ArgumentError UUID("550e8400e29b-41d4-a716-44665544000098")
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