CryptoKit - Insecure.MD5Digest.byteCount is 20?

My limited understanding of md5 is that the result will be 128 bits, and 128 / 8 = 16 bytes, which is the same as CC_MD5_DIGEST_LENGTH from CommonCrypto. However, when I use Insecure.MD5 from CryptoKit, the digest has 20 bytes with zeros at the end!


I'm not sure if Insecure.MD5Digest.byteCount is intended to be 20, or is this by mistake?

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Apollonian
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Chiming in from the future - in case anyone else runs into this, iOS 13.0 does appear to have shipped with this bug. I've verified that I don't see it in any revision beyond 13.0 and thus now available check MD5s with 13.1 instead of 13.0, relying on CommonCrypto for the rest.

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alhxdbx
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Some of our users are seeing the same issue with iOS 13.6. However, I'm not able to reproduce it on any device.
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RogerWikiloc
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