Baguette/sodium.cr
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Makes Cox::Blake2b#finish public and allows providing existing buffer.

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This commit is contained in:
Didactic Drunk 2019-05-29 16:29:41 -07:00
parent 6670b22ca1
commit 903b666943
1 changed files with 18 additions and 5 deletions
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23
src/cox/blake2b.cr
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@ -17,17 +17,20 @@ module Cox
OUT_SIZE_MIN = LibSodium.crypto_generichash_blake2b_bytes_min.to_i32
OUT_SIZE_MAX = LibSodium.crypto_generichash_blake2b_bytes_max.to_i32
getter digest_size
@state = StaticArray(UInt8, 384).new 0
@key_size = 0
@have_salt = false
@have_personal = false
# implemented as static array's so clone works without jumping through hoops.
@key = StaticArray(UInt8, 64).new 0
@salt = StaticArray(UInt8, 16).new 0
@personal = StaticArray(UInt8, 16).new 0
def initialize(@out_size : Int32 = OUT_SIZE, key : Bytes? = nil, salt : Bytes? = nil, personal : Bytes? = nil)
def initialize(@digest_size : Int32 = OUT_SIZE, key : Bytes? = nil, salt : Bytes? = nil, personal : Bytes? = nil)
if k = key
raise ArgumentError.new("key larger than KEY_SIZE_MAX, got #{k.bytesize}") if k.bytesize > KEY_SIZE_MAX
@key_size = k.bytesize
@ -54,7 +57,7 @@ module Cox
salt = @have_salt ? @salt.to_unsafe : nil
personal = @have_personal ? @personal.to_unsafe : nil
if LibSodium.crypto_generichash_blake2b_init_salt_personal(@state, key, @key_size, @out_size, salt, personal) != 0
if LibSodium.crypto_generichash_blake2b_init_salt_personal(@state, key, @key_size, @digest_size, salt, personal) != 0
raise Cox::Error.new("blake2b_init_key_salt_personal")
end
end
@ -67,12 +70,22 @@ module Cox
self
end
# Destructive operation. Assumes you know what you are doing.
# Use .digest or .hexdigest instead.
def finish
data = Bytes.new @out_size
if LibSodium.crypto_generichash_blake2b_final(@state, data, data.bytesize) != 0
dst = Bytes.new @digest_size
finish dst
dst
end
# Destructive operation. Assumes you know what you are doing.
# Use .digest or .hexdigest instead.
def finish(dst : Bytes) : Bytes
if LibSodium.crypto_generichash_blake2b_final(@state, dst, dst.bytesize) != 0
raise Cox::Error.new("crypto_generichash_blake2b_final")
end
data
dst
end
def clone