diff options
Diffstat (limited to 'mpi/ec.c')
| -rw-r--r-- | mpi/ec.c | 21 |
1 files changed, 21 insertions, 0 deletions
@@ -589,6 +589,27 @@ _gcry_mpi_ec_set_point (const char *name, gcry_mpi_point_t newvalue, } +/* Given an encoded point in the MPI VALUE and a context EC, decode + * the point according to the context and store it in RESULT. On + * error an error code is return but RESULT might have been changed. + * If no context is given the function tries to decode VALUE by + * assuming a 0x04 prefixed uncompressed encoding. */ +gpg_err_code_t +_gcry_mpi_ec_decode_point (mpi_point_t result, gcry_mpi_t value, mpi_ec_t ec) +{ + gcry_err_code_t rc; + + if (ec && ec->dialect == ECC_DIALECT_ED25519) + rc = _gcry_ecc_eddsa_decodepoint (value, ec, result, NULL, NULL); + else if (ec && ec->model == MPI_EC_MONTGOMERY) + rc = _gcry_ecc_mont_decodepoint (value, ec, result); + else + rc = _gcry_ecc_os2ec (result, value); + + return rc; +} + + /* Compute the affine coordinates from the projective coordinates in POINT. Set them into X and Y. If one coordinate is not required, X or Y may be passed as NULL. CTX is the usual context. Returns: 0 |