Add t_cose_key_encode API #287
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Signed-off-by: Tamas Ban <[email protected]> Change-Id: I732db4fc4003c3895af342ec953bd1bdf1da28c0
| * The t_cose_key must be imported to the crypto library before this call. | ||
| */ | ||
| enum t_cose_err_t | ||
| t_cose_key_encode(struct t_cose_key key, |
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This name seems a bit too generic. I suggest adding an "ec2" infix somewhere, e.g., t_cose_key_encode_ec2
| QCBOREncodeContext cbor_encoder; | ||
| QCBORError qcbor_result; | ||
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| result = t_cose_crypto_export_ec2_key(key, |
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I assume all the relevant checks from rfc9053 (point on curve, etc.) are done here, right?
| QCBOREncode_AddInt64ToMapN(&cbor_encoder, T_COSE_KEY_COMMON_KTY, T_COSE_KEY_TYPE_EC2); | ||
| QCBOREncode_AddInt64ToMapN(&cbor_encoder, T_COSE_KEY_PARAM_CRV, cose_curve); | ||
| QCBOREncode_AddBytesToMapN(&cbor_encoder, T_COSE_KEY_PARAM_X_COORDINATE, x_coord); | ||
| if (q_useful_buf_c_is_null(y_coord)) { |
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If this function is limited to EC2, both coordinates are needed - i.e., the compressed form x + y-sign is not allowed.
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Sorry, this comment is wrong. RFC9053 recommends not to use compressed (due to potential IPR), but it doesn't forbid it.
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Multiple partial implementations of the COSE_Key encode/decode APIs exists across the tf.org repos. To replace these with a full implementation copy the relevant functions from t_cose_psa_crypto.c from the upstream repo. On top of this, backporting two open PRs: - Only t_cose_key_decode(): laurencelundblade/t_cose#287 - laurencelundblade/t_cose#285 Signed-off-by: Tamas Ban <[email protected]> Change-Id: I6c7a67a4f2a57b90363ffeac9b023296a123e966
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