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List Montgomery curves in mbedtls_ecp_curve_list()

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mbedtls_ecp_curve_list() now lists Curve25519 and Curve448 under the names
"x25519" and "x448". These curves support ECDH but not ECDSA.

This was meant ever since the introduction of mbedtls_ecdsa_can_do()
in 0082f9df6f, but
2c69d10bac had removed the claim
that Montgomery curves support ECDH except through Everest.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine 2020-07-24 02:03:20 +02:00
parent 326e474a6d
commit 360e2c41d8
2 changed files with 9 additions and 1 deletions
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5
ChangeLog.d/ecp_curve_list.txt Normal file
View file

@ -0,0 +1,5 @@
Bugfix
* mbedtls_ecp_curve_list() now lists Curve25519 and Curve448 under the names
"x25519" and "x448". These curves support ECDH but not ECDSA. If you need
only the curves that support ECDSA, filter the list with
mbedtls_ecdsa_can_do().

5
library/ecp.c
View file

@ -546,8 +546,11 @@ static const mbedtls_ecp_curve_info ecp_supported_curves[] =
#if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED) #if defined(MBEDTLS_ECP_DP_SECP192K1_ENABLED)
{ MBEDTLS_ECP_DP_SECP192K1, 18, 192, "secp192k1" }, { MBEDTLS_ECP_DP_SECP192K1, 18, 192, "secp192k1" },
#endif #endif
#if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED) && defined(MBEDTLS_ECDH_VARIANT_EVEREST_ENABLED) #if defined(MBEDTLS_ECP_DP_CURVE25519_ENABLED)
{ MBEDTLS_ECP_DP_CURVE25519, 29, 256, "x25519" }, { MBEDTLS_ECP_DP_CURVE25519, 29, 256, "x25519" },
#endif
#if defined(MBEDTLS_ECP_DP_CURVE448_ENABLED)
{ MBEDTLS_ECP_DP_CURVE448, 30, 448, "x448" },
#endif #endif
{ MBEDTLS_ECP_DP_NONE, 0, 0, NULL }, { MBEDTLS_ECP_DP_NONE, 0, 0, NULL },
}; };