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0e2315859f
Exporting an asymmetric key only worked if the target buffer had exactly the right size, because psa_export_key uses mbedtls_pk_write_key_der or mbedtls_pk_write_pubkey_der and these functions write to the end of the buffer, which psa_export_key did not correct for. Fix this by moving the data to the beginning of the buffer if necessary. Add non-regression tests.