Why isn't mutate working?

Question

I am seeing something I don't understand.

This one works, though it's super slow.

eo1$digest <- sapply(paste(eo1$EIN,eo1$NAME), digest)

This one doesn't work: all the digests are the same.

eo1 <- mutate(eo1, digest=digest(paste(EIN,NAME)))

This produces the values I'd expect! EIN concatenated with NAME.

eo1 <- mutate(eo1, digest=paste(EIN,NAME))

But I need the hash of that.