var golang.org/x/crypto/openpgp/armor.blockEnd

2 uses

	golang.org/x/crypto/openpgp/armor (current package)
		encode.go#L13: var blockEnd = []byte("\n=")
		encode.go#L128: 	return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine)