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Add negative tests for Curve25519

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If we provide low order element as a public key and the implementation
maps the point in infinity to the origin, we can force the common secret
to be zero.

According to the standard (RFC 7748) this is allowed but in this case
the primitive must not be used in a protocol that requires contributory
behaviour.

Mbed Crypto returns an error when the result is the point in the
infinity and does not map it to the origin. This is safe even if used in
protocols that require contributory behaviour.

This commit adds test cases that verify that Mbed Crypto returns an
error when low order public keys are processed.

The low order elements in the test cases were taken from this website:
https://cr.yp.to/ecdh.html
This commit is contained in:
Janos Follath 2019-04-26 15:06:22 +01:00
parent 182b0b9966
commit 05a708f7e2
1 changed files with 16 additions and 0 deletions
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16
tests/suites/test_suite_ecp.data
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@ -430,6 +430,22 @@ ECP point multiplication Curve25519 (normalized) #1
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660":"09":"00":"01":"057E23EA9F1CBE8A27168F6E696A791DE61DD3AF7ACD4EEACC6E7BA514FDA863":"00":"01":0
ECP point multiplication Curve25519 (not normalized) #2
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660":"1B":"00":"03":"057E23EA9F1CBE8A27168F6E696A791DE61DD3AF7ACD4EEACC6E7BA514FDA863":"00":"01":MBEDTLS_ERR_ECP_INVALID_KEY
ECP point multiplication Curve25519 (element of order 2: origin) #3
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660":"00":"00":"01":"00":"01":"00":MBEDTLS_ERR_MPI_NOT_ACCEPTABLE
ECP point multiplication Curve25519 (element of order 4: 1) #4
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660":"01":"00":"01":"00":"01":"00":MBEDTLS_ERR_MPI_NOT_ACCEPTABLE
ECP point multiplication Curve25519 (element of order 8) #5
depends_on:MBEDTLS_ECP_DP_CURVE25519_ENABLED
ecp_test_mul:MBEDTLS_ECP_DP_CURVE25519:"5AC99F33632E5A768DE7E81BF854C27C46E3FBF2ABBACD29EC4AFF517369C660":"B8495F16056286FDB1329CEB8D09DA6AC49FF1FAE35616AEB8413B7C7AEBE0":"00":"01":"00":"01":"00":MBEDTLS_ERR_MPI_NOT_ACCEPTABLE
ECP test vectors Curve448 (RFC 7748 6.2, after decodeUCoordinate)
depends_on:MBEDTLS_ECP_DP_CURVE448_ENABLED
ecp_test_vec_x:MBEDTLS_ECP_DP_CURVE448:"eb7298a5c0d8c29a1dab27f1a6826300917389449741a974f5bac9d98dc298d46555bce8bae89eeed400584bb046cf75579f51d125498f98":"a01fc432e5807f17530d1288da125b0cd453d941726436c8bbd9c5222c3da7fa639ce03db8d23b274a0721a1aed5227de6e3b731ccf7089b":"ad997351b6106f36b0d1091b929c4c37213e0d2b97e85ebb20c127691d0dad8f1d8175b0723745e639a3cb7044290b99e0e2a0c27a6a301c":"0936f37bc6c1bd07ae3dec7ab5dc06a73ca13242fb343efc72b9d82730b445f3d4b0bd077162a46dcfec6f9b590bfcbcf520cdb029a8b73e":"9d874a5137509a449ad5853040241c5236395435c36424fd560b0cb62b281d285275a740ce32a22dd1740f4aa9161cec95ccc61a18f4ff07"