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base64: base64url encoding has no padding #9139

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See RFC4648 section 5 and RFC7540 section 3.2.1.

Suppress generation of '=' padding of base64url encoding. This is
accomplished by considering the string beginning at offset 64 in the
character table as the padding: this is "=" for base64, "" for base64url.

Also use strchr() to replace character search loops where possible.

Suppress erroneous comments about empty encoding results.

Adjust unit test 1302 to unpadded base64url encoding and add tests for
empty results.

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lib/base64.c Outdated
@@ -187,6 +179,7 @@ static CURLcode base64_encode(const char *table64,
char *output;
char *base64data;
const char *indata = inputbuff;
const char *padstr = table64 + 64;
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maybe const char *padstr = &table64[64] instead? I think it makes the code clearer what it wants to point to.

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Done.

See RFC4648 section 5 and RFC7540 section 3.2.1.

Suppress generation of '=' padding of base64url encoding. This is
accomplished by considering the string beginning at offset 64 in the
character table as the padding: this is "=" for base64, "" for base64url.

Also use strchr() to replace character search loops where possible.

Suppress erroneous comments about empty encoding results.

Adjust unit test 1302 to unpadded base64url encoding and add tests for
empty results.
@bagder bagder closed this in c2e72c7 Jul 19, 2022
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bagder commented Jul 19, 2022

Thanks!

@monnerat monnerat deleted the base64 branch July 19, 2022 10:36
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3 participants