24 lines
616 B
Lua
24 lines
616 B
Lua
local expect = require "cc.expect".expect
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local fp = require "ccryptolib.internal.fp"
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local x25519 = require "ccryptolib.internal.x25519"
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local mod = {}
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function mod.publicKey(sk)
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expect(1, sk, "string")
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assert(#sk == 32, "secret key length must be 32")
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return fp.encode(x25519.ladder(x25519.G, x25519.bits(sk)))
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end
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function mod.exchange(sk, pk)
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expect(1, sk, "string")
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assert(#sk == 32, "secret key length must be 32")
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expect(2, pk, "string")
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assert(#pk == 32, "public key length must be 32")
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return fp.encode(x25519.ladder(fp.decode(pk), x25519.bits(sk)))
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end
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return mod
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