add step-by-step how-to encrypting multiline values

README.md

@@ -187,6 +187,89 @@ file just like any other eyaml string and your done.  If the file is rather
 large, you may wish to use a helper like `xclip` to copy the stdout directly to
 your clipboard.
 
+### Encrypting multiline values
+
+The following step-by-step example shows you how to encrypt multiline values.
+
+- Copy the YAML text below to a file named `multiline_example.eyaml`
+```
+---
+accounts::key_sets:
+  dummy:
+    private: |
+      ---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----
+      Comment: "dummy-key-hiera-eyaml-issue-rsa-key-20200911"
+      P2/56wAAANwAAAA3aWYtbW9kbntzaWdue3JzYS1wa2NzMS1zaGExfSxlbmNyeXB0e3JzYS
+      1wa2NzMXYyLW9hZXB9fQAAAARub25lAAAAjQAAAIkAAAAGJQAAAP93ZtrMIRZutZ/SZUyw
+      JWwyI4YxNvr5tBt9UnSJ7K0+rQAAAQDohO1ykUahsogS+ymM6o9WEmdROJZpWShCqdv8Dj
+      2roQAAAIDG1G8hY90Xlz/YiFhDZLLWAAAAgOzMWTfAlHbJ4AdEhG5uU/EAAACA+1/AlcSr
+      QEPM5xLW0unCsQ==
+      ---- END SSH2 ENCRYPTED PRIVATE KEY ----
+```
+
+- Use `edit` to ...
+  - replace '|' with '>',
+  - prepend `DEC::PKCS7[` before the first line,
+  - remove all whitespaces used for indentation,
+  - and append `]!` to the last line of the multiline value.
+
+`eyaml edit multiline_example.eyaml`
+```
+---
+accounts::key_sets:
+  dummy:
+    private: >
+      DEC::PKCS7[---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----
+Comment: "dummy-key-hiera-eyaml-issue-rsa-key-20170123"
+P2/56wAAANwAAAA3aWYtbW9kbntzaWdue3JzYS1wa2NzMS1zaGExfSxlbmNyeXB0e3JzYS
+1wa2NzMXYyLW9hZXB9fQAAAARub25lAAAAjQAAAIkAAAAGJQAAAP93ZtrMIRZutZ/SZUyw
+JWwyI4YxNvr5tBt9UnSJ7K0+rQAAAQDohO1ykUahsogS+ymM6o9WEmdROJZpWShCqdv8Dj
+2roQAAAIDG1G8hY90Xlz/YiFhDZLLWAAAAgOzMWTfAlHbJ4AdEhG5uU/EAAACA+1/AlcSr
+QEPM5xLW0unCsQ==
+---- END SSH2 ENCRYPTED PRIVATE KEY ----]!
+```
+```
+# resulting encrypted file
+---
+accounts::key_sets:
+  dummy:
+    private: >
+      ENC[PKCS7,MIIDTQYJKoZIhvcNAQcDoIIDPjCCAzoCAQAxggEhMIIBHQIBADAFMAACAQEw
+      DQYJKoZIhvcNAQEBBQAEggEAXH7xB1xuzoMAqA/3jSXO0ZUR6+UCb3DsTTj3
+      Lsrcx5oQBnJ/ml7GfBCPxBKfArZunLcnxmSk4hECKXdfgKsVjAa++JQWvtEm
+      HUNTFqvwd76Ku+nMfI9c8g+X+l6obLjzWfJdg3t6Ja7CJKl8UNFtSmbfYKVi
+      nZ0xBubgdY4plLAFcZyD5/A/lNFqwb051TRLbZOIRRfLUlRL7RNkKRC59Aog
+      S5aJXjmqx6vRzFifNK0JFZvYHGD75TiHJ5LFjg4rjgFd43AnK8iNo773ZWP2
+      48Gly5Zx7qVQDCDDi1YBgNFb0NIBQw+kWy7HcPH2REvPnXu/HV2FWvDP3Ond
+      yr2EbTCCAg4GCSqGSIb3DQEHATAdBglghkgBZQMEASoEEH+CjZJ1gKfaQIrr
+      N5zef7OAggHgBmRVsfaoiNEOzhmHZ5SxxZztmpBNtLv7mteaSqSL5o0TtKQh
+      SDgxBhaQmlL51+JM1Jsnvqm57ikZhj7Vtek/vr5DhYhWs0AxttH5rNaw0zKU
+      4bMppVu+SNKCtT+2Qw31x/S7gF7yVl+mwmXhq3qAj9ExWRX3d/8/zTuC61Io
+      f+7O6YUOucZ/m/YPrQnC5v7bDSKlIf1aFaKqukjM3QO8FZlAOHGPvRuWV2Om
+      QIgxQE6F8r+bTkW3KiVIx5FEIthRZ90VS3tz/2wjj77svddBhlid9ov/0ard
+      GGVNGsl1BFpLqxC0mpZXz237cL/aM58naqmX52J6YmC0xQM3DNmahWlYx1HV
+      J/Ogk12pOYPLJB/09OuoHPzKC4WfpB9B7wAC6pghRkO/84cOw6rgSdbzze5W
+      WMPvo181Y74BSBKhJDdO3lWYmEcDyx4TEsMUlpxd9PBDcOHqf9qHviXrwGzO
+      oSm2bUV0Fum5ueU+D2vu3mO0yIQ6fwyvDZLBRjfJV7K/PyDz81feWT6+g38t
+      AC27c0h8wk9b7HYfqG28nZE7F13qrhwCKnOaYLglsmbszNpRrBhfo1IHF6oM
+      YZRZrnrGQg5qQcxMsLq37RAfRgkY0rRLs78EEAhkf4NDxw0A/ovt]
+```
+- Output of `eyaml decrypt -f multiline_example.eyaml`:
+```
+---
+accounts::key_sets:
+  dummy:
+    private: |
+  ---- BEGIN SSH2 ENCRYPTED PRIVATE KEY ----
+  Comment: "dummy-key-hiera-eyaml-issue-rsa-key-20200911"
+  P2/56wAAANwAAAA3aWYtbW9kbntzaWdue3JzYS1wa2NzMS1zaGExfSxlbmNyeXB0e3JzYS
+  1wa2NzMXYyLW9hZXB9fQAAAARub25lAAAAjQAAAIkAAAAGJQAAAP93ZtrMIRZutZ/SZUyw
+  JWwyI4YxNvr5tBt9UnSJ7K0+rQAAAQDohO1ykUahsogS+ymM6o9WEmdROJZpWShCqdv8Dj
+  2roQAAAIDG1G8hY90Xlz/YiFhDZLLWAAAAgOzMWTfAlHbJ4AdEhG5uU/EAAACA+1/AlcSr
+  QEPM5xLW0unCsQ==
+  ---- END SSH2 ENCRYPTED PRIVATE KEY ----
+```
+  - The output *does NOT* have to be valid YAML for usage with Puppet.
 
 Hiera
 -----