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util: base32hex - explain distinction with base32

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This commit is contained in:
Tom Gundersen 2015-07-23 18:45:49 +02:00
parent c73ee39d10
commit 75c0cab158
1 changed files with 6 additions and 1 deletions
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7
src/basic/util.c
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@ -954,7 +954,12 @@ int unhexmem(const char *p, size_t l, void **mem, size_t *len) {
return 0; return 0;
} }
/* https://tools.ietf.org/html/rfc4648#section-6 */ /* https://tools.ietf.org/html/rfc4648#section-6
* Notice that base32hex differs from base32 in the alphabet it uses.
* The distinction is that the base32hex representation preserves the
* order of the underlying data when compared as bytestrings, this is
* useful when representing NSEC3 hashes, as one can then verify the
* order of hashes directly from their representation. */
char base32hexchar(int x) { char base32hexchar(int x) {
static const char table[32] = "0123456789" static const char table[32] = "0123456789"
"ABCDEFGHIJKLMNOPQRSTUV"; "ABCDEFGHIJKLMNOPQRSTUV";