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38 lines
1.3 KiB
Plaintext
38 lines
1.3 KiB
Plaintext
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cryptography:
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H(x) is 512 bit blake2b digest of x
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HS(x) is 256 bit blake2b digest of x
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MD(x, k) is 512 bit blake2b hmac of x with secret value k
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MDS(x, k) is 256 bit blake2b hmac of x with secret value k
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SE(k, n, x) is chacha20 encrypt data x using symettric key k and nounce n
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SD(k, n, x) is chacha20 dectypt data x using symettric key k and nounce n
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S(k, x) is sign x with ed25519 using secret key k
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EDKG() is generate ec keypair (p, s) public key p (32 bytes), secret key s (643 bytes)
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V(k, x, sig) is verify x data using signature sig using public key k
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EDDH(a, b) is curve25519 scalar multiplication of a and b
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HKE(a, b, x) is hashed key exchange between a and b using a secret key x HS(a + b + EDDH(x, b))
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TKE(a, b, sk, n) is a transport shared secret kdf using MDS(n, HKE(a, b, sk))
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when A is client and B is server where n is a 32 bytes shared random
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client computes TKE(A.pk, B.pk, A.sk, n)
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server computes TKE(A.pk, B.pk, B.sk, n)
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PDH(a, b, x) is path shared secret generation HS(a + b + curve41417_scalar_mult(x, b))
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PKE(a, b, x, n) is a path shared secret kdf using MDS(n, PDH(a, b, x))
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given A is the path creator and B is a hop in the path and n is 32 bytes shared random
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A computes PKE(A.pk, B.pk, A.sk, n) as S_a
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B computes PKE(A.pk, B.pk, B.sk, n) as S_b
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S_a is equal to S_b
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RAND(n) is n random bytes
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