ecc: Introduce new dialect: ECC_DIALECT_SAFECURVE.
498ab6d9f2f8
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Description

ecc: Introduce new dialect: ECC_DIALECT_SAFECURVE.

* src/mpi.h (ECC_DIALECT_SAFECURVE): New.
* cipher/ecc-misc.c (_gcry_ecc_dialect2str): Support the new dialect.
* cipher/ecc-curves.c (mpi_ec_setup_elliptic_curve): Support opaque
MPI handling of secret 'd' for ECC_DIALECT_SAFECURVE.
* cipher/ecc.c (nist_generate_key): Support opaque secret for
ECC_DIALECT_SAFECURVE.
(test_ecdh_only_keys): Likewise.
(ecc_generate): Support native point representation for
ECC_DIALECT_SAFECURVE.
(ecc_encrypt_raw): Support opaque MPI handling of secret and
native point representation for ECC_DIALECT_SAFECURVE.
(ecc_decrypt_raw): Support native point representation for
ECC_DIALECT_SAFECURVE.
(_gcry_pk_ecc_get_sexp): Likewise.

Possibly, in future, when we will change Ed25519 support
by ECC_DIALECT_SAFECURVE, for backward compatibility, we
will add left-padding zeros in mpi_ec_setup_elliptic_curve.