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New elliptic curve family: twisted Edwards

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Add an elliptic curve family for the twisted Edwards curves
Edwards25519 and Edwards448 ("Goldilocks"). As with Montgomery curves,
since these are the only two curves in common use, the family has a
generic name.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
This commit is contained in:
Gilles Peskine
2021-02-24 21:49:40 +01:00
parent 4a7074022a
commit 67546802fe
6 changed files with 81 additions and 1 deletions
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14
include/psa/crypto_values.h
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@ -569,6 +569,20 @@
*/
#define PSA_ECC_FAMILY_MONTGOMERY ((psa_ecc_family_t) 0x41)
/** The twisted Edwards curves Ed25519 and Ed448.
*
* These curves are suitable for EdDSA.
*
* This family comprises the following twisted Edwards curves:
* - 256-bit: Edwards25519, the twisted Edwards curve birationally equivalent
* to Curve25519.
* Bernstein et al., _Twisted Edwards curves_, Africacrypt 2008.
* - 448-bit: Edwards448, the twisted Edwards curve birationally equivalent
* to Curve448.
* Hamburg, _Ed448-Goldilocks, a new elliptic curve_, NIST ECC Workshop, 2015.
*/
#define PSA_ECC_FAMILY_TWISTED_EDWARDS ((psa_ecc_family_t) 0x42)
#define PSA_KEY_TYPE_DH_PUBLIC_KEY_BASE ((psa_key_type_t)0x4200)
#define PSA_KEY_TYPE_DH_KEY_PAIR_BASE ((psa_key_type_t)0x7200)
#define PSA_KEY_TYPE_DH_GROUP_MASK ((psa_key_type_t)0x00ff)