shell/caucase.sh: Add support for CRL PEM chunk iteration.

shell/caucase.sh

@@ -229,6 +229,10 @@ _matchPrivateKeyBoundary () {
   return 1
 }
 
+_matchCRLBoundary () {
+  test "$1" = '-----END X509 CRL-----'
+}
+
 _forEachPEM () {
   # Iterate over components of a PEM file, piping each to <command>
   # Usage: <type tester> <command> [<arg> ...] < pem
@@ -263,6 +267,10 @@ alias forEachPrivateKey='_forEachPEM _matchPrivateKeyBoundary'
 # Iterate over private key of a PEM file, piping each to <command>
 # Usage: <command> [<arg> ...] < pem
 
+alias foreachCRL='_forEachPEM _matchCRLBoundary'
+# Iterate over CRLs of a PEM file, piping each to <command>
+# Usage: <command> [<arg> ...] < pem
+
 alias pem2fingerprint='openssl x509 -fingerprint -noout'
 
 pemFingerprintIs () {