Private EC key format: update key representation size macro
/* Maximum size of the export encoding of an ECC key pair.
*
- * ECPrivateKey ::= SEQUENCE {
- * version INTEGER, -- must be 1
- * privateKey OCTET STRING,
- * -- `ceiling(log2(n)/8)`-byte string, big endian,
- * -- where n is the order of the curve.
- * parameters [0] IMPLICIT ECParameters {{ NamedCurve }},
- * publicKey [1] IMPLICIT BIT STRING
- * }
- *
- * - 4 bytes of SEQUENCE overhead;
- * - 1 * point size in privateKey
- * - 1 + 1 + 12 bytes of namedCurve OID;
- * - 4 bytes of BIT STRING overhead;
- * - public key as for #PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE.
+ * An ECC key pair is represented by the secret value.
*/
#define PSA_KEY_EXPORT_ECC_KEYPAIR_MAX_SIZE(key_bits) \
- (3 * PSA_BITS_TO_BYTES(key_bits) + 56)
+ (PSA_BITS_TO_BYTES(key_bits))
/** Safe output buffer size for psa_export_key() or psa_export_public_key().
*
