Add well formatted toString() for KeyRingInfo class

[vanitasvitae]

No description provided.

[vanitasvitae]

I started creating a StreamDumper utility, which can be used to pretty-print OpenPGP packet structures in a human readable way.

The current work is tracked in https://github.com/pgpainless/pgpainless/tree/streamdump

Example output:

##############################################
Encrypted Message
##############################################
Public-Key Encrypted Session Key Packet
  Recipient: 8bd88e94c0d20333
  No Decryption Method

  Modification Detection Code Packet


##############################################
Signed Message
##############################################
One-Pass Signature Packet
  Type: BINARY_DOCUMENT
  Public Key Algorithm: RSA_GENERAL
  Hash Algorithm: SHA256
  Issuer Key ID: d03f6f865226fe8b

One-Pass Signature Packet
  Type: BINARY_DOCUMENT
  Public Key Algorithm: EDDSA
  Hash Algorithm: SHA512
  Issuer Key ID: 935e20fdc99d986

Literal Data Packet
  Format: BINARY
  Content: "Hello, world!\n"

Signature Packet
  Version: 4
  Type: BINARY_DOCUMENT
  Public Key Algorithm: EDDSA
  Hash Algorithm: SHA512
  Hashed Area:
    Signature Creation Time: 2019-02-27 13:48:34 UTC (critical)
    Issuer Fingerprint: 8de64cad1758fc194560cf590935e20fdc99d986
    Issuer Key ID: 935e20fdc99d986
  Digest Prefix: b902
  Signature: 
    53f143f0f3eaa8006b91d83d6d5e1a4e83fa6043605c6abc33b488bd36b39e5dcd4a74e2ac5163d0821e40269de4394cd23bbbfe6eb7f0d373b5c1068e9a0b07

Signature Packet
  Version: 4
  Type: BINARY_DOCUMENT
  Public Key Algorithm: RSA_GENERAL
  Hash Algorithm: SHA256
  Hashed Area:
    Signature Creation Time: 2019-09-29 12:36:15 UTC (critical)
    Issuer Fingerprint: 3e8877c877274692975189f5d03f6f865226fe8b
    Issuer Key ID: d03f6f865226fe8b
  Digest Prefix: 10d5
  Signature: 
    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

##############################################
Encrypted Message (with Wrong Session Key)
##############################################
Public-Key Encrypted Session Key Packet
  Recipient: 8bd88e94c0d20333
  Session Key: 920b1779565c8df4dd9db46966cdf2b51bc882c241de8ef437cadec711e7ebff
  Symmetric Algorithm: AES_256
  Decryption Successful

  Decryption Failed

  Modification Detection Code Packet


##############################################
Signed Compressed Data
##############################################
Compressed Data Packet
  Algorithm: ZIP

  One-Pass Signature Packet
    Type: BINARY_DOCUMENT
    Public Key Algorithm: EDDSA
    Hash Algorithm: SHA256
    Issuer Key ID: e189d2125de7da64

  Literal Data Packet
    Format: BINARY
    Modification Date: 2019-03-14 13:37:49 UTC
    Content: "Hello, world!\n"

  Signature Packet
    Version: 4
    Type: BINARY_DOCUMENT
    Public Key Algorithm: EDDSA
    Hash Algorithm: SHA256
    Hashed Area:
      Issuer Fingerprint: 6eb35bef25ca35e594659359e189d2125de7da64
      Signature Creation Time: 2019-03-14 13:37:49 UTC
    Unhashed Area:
      Issuer Key ID: e189d2125de7da64
    Digest Prefix: 7e3f
    Signature: 
      6847982fc9ad640f30bbb8a0e18eb0f3898ecdd1e916a160b1c3f971826d1d73b1f83c7e0ec06b6706113b818163877b389bd95e97947c393c00aa40ae04020a

##############################################
Encrypted Message for Two Recipients
##############################################
Public-Key Encrypted Session Key Packet
  Recipient: 8bd88e94c0d20333
  Session Key: 092f816748b2c6fca49130e931f9ddcf46e4106ce3c4a8437ab660e0c6fed0a1
  Symmetric Algorithm: AES_256
  Decryption Successful

  Literal Data Packet
    Format: BINARY
    Content: "Test, 1-2-3.\n"

  Modification Detection Code Packet
    Valid: true

Public-Key Encrypted Session Key Packet
  Recipient: 49e2118166c92632
  Decryption Failed

  Modification Detection Code Packet


##############################################
Secret Key
##############################################
Secret-Key Packet
  Version: 4
  Creation Time: 2018-06-11 14:12:09 UTC
  Public Key Algorithm: EDDSA
  Public Key Size: 256
  Fingerprint: 8e8c33fa4626337976d97978069c0c348dd82c19
  Key-ID: 69c0c348dd82c19

User-ID Packet
  Value: Emmelie Dorothea Dina Samantha Awina Ed25519

Signature Packet
  Version: 4
  Type: POSITIVE_CERTIFICATION
  Public Key Algorithm: EDDSA
  Hash Algorithm: SHA256
  Hashed Area:
    Issuer Fingerprint: 8e8c33fa4626337976d97978069c0c348dd82c19
    Signature Creation Time: 2018-06-11 14:12:09 UTC
    Key Flags: [CERTIFY_OTHER, SIGN_DATA]
    Preferred Symmetric Algorithms: [AES_256, AES_192, AES_128, TRIPLE_DES]
    Preferred Hash Algorithms: [SHA512, SHA384, SHA256, SHA224, SHA1]
    Preferred Compression Algorithms: [ZLIB, BZIP2, ZIP]
    Features: [MODIFICATION_DETECTION]
    Key Server Preferences: [NO_MODIFY]
  Unhashed Area:
    Issuer Key ID: 69c0c348dd82c19
  Digest Prefix: 68e7
  Signature: 
    0760b24e1fe111039a655e7a4ea46969b63ece90acd9c4d7ec88d99e4122e4e045b10080afc890642888adb606e7c905e6975532b2067f56fd1dccd6fe520b0f

Secret-Subkey Packet
  Version: 4
  Creation Time: 2018-08-27 10:55:43 UTC
  Public Key Algorithm: EDDSA
  Public Key Size: 256
  Fingerprint: 061c3ca44aff0ec58dc66e9522e3fafe96b56c32
  Key-ID: 22e3fafe96b56c32

Signature Packet
  Version: 4
  Type: SUBKEY_BINDING
  Public Key Algorithm: EDDSA
  Hash Algorithm: SHA256
  Hashed Area:
    Issuer Fingerprint: 8e8c33fa4626337976d97978069c0c348dd82c19
    Signature Creation Time: 2018-08-27 10:55:43 UTC
    Key Flags: [SIGN_DATA]
  Unhashed Area:
    Issuer Key ID: 69c0c348dd82c19
    Embedded Signature:
      Signature Packet
        Version: 4
        Type: PRIMARYKEY_BINDING
        Public Key Algorithm: EDDSA
        Hash Algorithm: SHA256
        Hashed Area:
          Issuer Fingerprint: 061c3ca44aff0ec58dc66e9522e3fafe96b56c32
          Signature Creation Time: 2018-08-27 10:55:43 UTC
        Unhashed Area:
          Issuer Key ID: 22e3fafe96b56c32
        Digest Prefix: 684d
        Signature: 
          7181f61054419638e74fa0e23c9604251a33e4801782729a3a7b573c0ffdb826df29a37f2f13d6ae04ba4e33c40a3552120861b76366ce7b604843c2b6e5b90a
    Digest Prefix: 2780
    Signature: 
      dd4a315f8b6f905d821d7132f8c620bc93f9a547ddd229a63fe60659c73b79ab518034f58aebc997021a30bf07abfb9a1b547277daf07c0b74b5faa3d1d6350b

##############################################
Encrypted Message (with Session Key)
##############################################
Public-Key Encrypted Session Key Packet
  Recipient: 8bd88e94c0d20333
  Session Key: 920b1779565c8df4dd9db46966cdf2b51bc882c241de8ef437cadec711e7eb04
  Symmetric Algorithm: AES_256
  Decryption Successful

  Literal Data Packet
    Format: BINARY
    Content: "Test, 1-2-3.\n"

  Modification Detection Code Packet
    Valid: true