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Just curious - if I'm using an end-entity (leaf) certificate that has a SHA-1 signature, does that mean that ALL certificates in the chain also must use SHA-1?

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    The reverse is going to be a part of the migration away from SHA1 in certificates. A certificate that uses a SHA1 digest algorithm can issue a certificate that uses SHA256. Migrating to SHA256 doesn't do any good unless all intermediates are also SHA256.
    – vcsjones
    Oct 23, 2014 at 18:14

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Yes it can. The algorithm used for signing a certificate by the issuer is independent from the algorithm which was used to sign the issuers certificate itself.

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