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Fix examples #259

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Fix examples #259

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6c26164
Fix examples
martinthomson Nov 2, 2016
d53076e
Add intermediate values, expand explanation of examples
martinthomson Nov 2, 2016
4cd62c9
More expansion on the examples
martinthomson Nov 2, 2016
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20 changes: 16 additions & 4 deletions draft-ietf-httpbis-encryption-encoding.md
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Original file line number Diff line number Diff line change
Expand Up @@ -362,7 +362,8 @@ wrapping is added to fit formatting constraints.
## Encryption of a Response {#explicit}

Here, a successful HTTP GET response has been encrypted using input keying
material that is identified by the string "a1".
material that is identified by an empty string (that is, the "keyid" field is
zero octets in length).

The encrypted data in this example is the UTF-8 encoded string "I am the
walrus". The input keying material is included in the Crypto-Key header field.
Expand All @@ -384,13 +385,24 @@ Note that the media type has been changed to "application/octet-stream" to avoid
exposing information about the content. Alternatively (and equivalently), the
Content-Type header field can be omitted.

Intermediate values for this example (all shown in base64):

~~~ inline
salt (from header) = sJvlboCWzB5jr8hI_q9cOQ
PRK = MLAQxt_DHjM15cdlyU1oUnjq7TFlzToGTkdRmvvxVBw
CEK = v31u7VGV3soO3wNaMaIdhg
NONCE = XOaygzko98zjUFTJ
plaintext = AABJIGFtIHRoZSB3YWxydXM
~~~


## Encryption with Multiple Records

This example shows the same encrypted message, but split into records of 10
octets each. The first record includes a single additional octet of padding,
which causes the end of the content to align with a record boundary, forcing the
creation of a third record that contains only padding.
octets each (that is, the "rs" field in the header is 10). The first record
includes a single additional octet of padding, which causes the end of the
content to align with a record boundary, forcing the creation of a third record
that contains only padding.

~~~ example
HTTP/1.1 200 OK
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