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comment on JSON canonicalization

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This commit is contained in:
Christian Grothoff 2020-01-19 21:18:03 +01:00
parent 84fd301313
commit c48e4a8a06
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2 changed files with 13 additions and 1 deletions
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6
src/include/taler_json_lib.h
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@ -107,6 +107,12 @@ TALER_JSON_spec_denomination_signature (const char *field,
/**
* Hash a JSON for binary signing.
*
* See https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme-15
* for fun JSON canonicalization problems. Callers must ensure that
* those are avoided in the input. We will use libjanson's "JSON_COMPACT"
* encoding for whitespace and "JSON_SORT_KEYS" to canonicalize as best
* as we can.
*
* @param[in] json some JSON value to hash
* @param[out] hc resulting hash code
* @return #GNUNET_OK on success, #GNUNET_SYSERR on error

8
src/json/json.c
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@ -25,7 +25,13 @@
/**
* Hash a JSON for binary signing.
* Hash a JSON object for binary signing.
*
* See https://tools.ietf.org/html/draft-rundgren-json-canonicalization-scheme-15
* for fun JSON canonicalization problems. Callers must ensure that
* those are avoided in the input. We will use libjanson's "JSON_COMPACT"
* encoding for whitespace and "JSON_SORT_KEYS" to canonicalize as best
* as we can.
*
* @param[in] json some JSON value
* @param[out] hc resulting hash code