Add support for PASERK Type: seal

[daviddesmet]

PASERK Type: seal

This PASERK is a secret key intended for local PASETOs, encrypted with an
asymmetric wrapping key.

Format

k[version].seal.[data]

ID Serialization

See lid.

Operations

See PKE for the algorithms used to perform
asymmetric encryption.

When serializing, [data] will be the base64url-encoded payload consisting
of the return values of the appropriate Encryption operation from the
PKE document, for this PASERK version.
These values will be concatenated together in the order the PKE document specifies
prior to base64url encoding.

Examples

k1.seal.QmXSEH_ei6jX3xvcZ5_l4k53mBTgJSRHWS07MB56tX0hBUqKE-ur-SdjRn68DF_j9BbUSif5kqAn4h7ozfW1IRr4tp26_gVdSN9wUcCMVFpc7kF_unOd8dJlqKuxAxy8pfVRtN5no12JKogWU9EBE1y8iv6k1CDetlU8htQsBhvpcNigBhFooNt8J2UZrNppDSlzO-bqJcz7gPFpqdp31wwCi9PIoaUG52GHTRrm600p6FftQ9V2XdnA5gL0TZQhRG3EstYR9s6p-Irrs7BcqH5QpC0ZRLcnsJHMkSvX79g7fkiJeEHbLRTjE0xUT8sUk6fxgSNJws8XDsBU-4p74OKW3GyZmtbxwhHN6hO4OJHRtV3MoLRJMDUVYCVfDVkEMYXd9kOq9_rRgeP_cCnHhbLncIpEUUfvLB_8OAesU6h88ulKDdsyIs2a7HCrvjfKwni4iz8yAabUf7JTzieoX9zRsYe52i6vmujSgiuiwKS_EbdPTKNiPu308QHfu_bubXYkRXmU6ieziqU1f4FAklxGNK9sZpK_uEYIUrhiT6uqIJmkMU410XFnVwkebd6OGXFoGvvIyaq0iPaF---fHXyCnmI9fyjV0kHy57I18pbDY-ujMUCnjZ-yYYmk2DyhYPURq50yNVptIjx7B8mU660KPWkACO1NUQhIdACDkHseNb7mER71l64A0Hmu9PZB4VHBH4NBhtdvll2vIVcLPk-BdDa1PziJy6QZweIel-IufvLl1awLu67d2D8DJw25NAPuCsdrfZMMqhe02nAmGg

k2.seal.rJZgCJrVrUFRPehByeSoO1wAUxG072_yZcyHKARrNU_ShbDBbW6xKtQl7se_PZZ9z1z484vcWmp0iTWGcVplCj2oZClme5JBCQeYSqc2lDev3xTFgOiRxX71gnnxSBkO

k3.seal.utQTzb7zGDXC-apbXsIby7yFZxoFFzUb40J1-zszMIjNkf3WLwEmqj9fuQwA8IKfAyWOvtZAxT4--kzAkYEKk492x2bypDps_a1Gsp-L9we22lWEkNVpqA-DWr9uoTRhSWRh87hFNla5ZzrpqMgeP1UOSDGKuRs62gZxFhCzsLka

k4.seal.3-VOL4pX5b7eV3uMhYHfOhJNN77YyYtd7wYXrH9rRucKNmq0aO-6AWIFU4xOXUCBk0mzBZeWAPAKrvejqixqeRXm-MQXt8yFGHmM1RzpdJw80nabbyDIsNCpBwltU-uj