good good study, day day up!

vendor/gopl.io/ch4/sha256/main.go

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+// Copyright © 2016 Alan A. A. Donovan & Brian W. Kernighan.
+// License: https://creativecommons.org/licenses/by-nc-sa/4.0/
+
+// See page 83.
+
+// The sha256 command computes the SHA256 hash (an array) of a string.
+package main
+
+import "fmt"
+
+//!+
+import "crypto/sha256"
+
+func main() {
+	c1 := sha256.Sum256([]byte("x"))
+	c2 := sha256.Sum256([]byte("X"))
+	fmt.Printf("%x\n%x\n%t\n%T\n", c1, c2, c1 == c2, c1)
+	// Output:
+	// 2d711642b726b04401627ca9fbac32f5c8530fb1903cc4db02258717921a4881
+	// 4b68ab3847feda7d6c62c1fbcbeebfa35eab7351ed5e78f4ddadea5df64b8015
+	// false
+	// [32]uint8
+}
+
+//!-