encoding/base64: add constant-time behavior, enabled by default #18
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Base64 encoding and decoding will now use a constant-time function rather than a map look-up by default.
New functions:
WithDecodeMappingFuncandWithEncodeMappingFuncallowsdevelopers to specify their own constant-time mapping functions for their own base64 alphabets.encoding/base64/mapping.go.Fixes golang#73901
🔄 This is a mirror of upstream PR #73909