diff --git a/CHANGES b/CHANGES
index 11badf47b0..e87b0e1f77 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,9 @@
+3329.	[bug]		Handle RRSIG signer-name case consistently: We
+			generate RRSIG records with the signer-name in
+			lower case.  We accept them with any case, but if
+			they fail to validate, we try again in lower case.
+			[RT #27451]
+
 	--- 9.9.1 released ---
 
 3318.	[tuning]	Reduce the amount of work performed while holding a
diff --git a/bin/named/statschannel.c b/bin/named/statschannel.c
index c87ef67ec6..61ed09b3dc 100644
--- a/bin/named/statschannel.c
+++ b/bin/named/statschannel.c
@@ -85,16 +85,19 @@ static const char *nsstats_desc[dns_nsstatscounter_max];
 static const char *resstats_desc[dns_resstatscounter_max];
 static const char *zonestats_desc[dns_zonestatscounter_max];
 static const char *sockstats_desc[isc_sockstatscounter_max];
+static const char *dnssecstats_desc[dns_dnssecstats_max];
 #ifdef HAVE_LIBXML2
 static const char *nsstats_xmldesc[dns_nsstatscounter_max];
 static const char *resstats_xmldesc[dns_resstatscounter_max];
 static const char *zonestats_xmldesc[dns_zonestatscounter_max];
 static const char *sockstats_xmldesc[isc_sockstatscounter_max];
+static const char *dnssecstats_xmldesc[dns_dnssecstats_max];
 #else
 #define nsstats_xmldesc NULL
 #define resstats_xmldesc NULL
 #define zonestats_xmldesc NULL
 #define sockstats_xmldesc NULL
+#define dnssecstats_xmldesc NULL
 #endif	/* HAVE_LIBXML2 */
 
 #define TRY0(a) do { xmlrc = (a); if (xmlrc < 0) goto error; } while(0)
@@ -108,6 +111,7 @@ static int nsstats_index[dns_nsstatscounter_max];
 static int resstats_index[dns_resstatscounter_max];
 static int zonestats_index[dns_zonestatscounter_max];
 static int sockstats_index[isc_sockstatscounter_max];
+static int dnssecstats_index[dns_dnssecstats_max];
 
 static inline void
 set_desc(int counter, int maxcounter, const char *fdesc, const char **fdescs,
@@ -409,6 +413,33 @@ init_desc(void) {
 			 "FDwatchRecvErr");
 	INSIST(i == isc_sockstatscounter_max);
 
+	/* Initialize DNSSEC statistics */
+	for (i = 0; i < dns_dnssecstats_max; i++)
+		dnssecstats_desc[i] = NULL;
+#ifdef  HAVE_LIBXML2
+	for (i = 0; i < dns_dnssecstats_max; i++)
+		dnssecstats_xmldesc[i] = NULL;
+#endif
+
+#define SET_DNSSECSTATDESC(counterid, desc, xmldesc) \
+	do { \
+		set_desc(dns_dnssecstats_ ## counterid, \
+			 dns_dnssecstats_max, \
+			 desc, dnssecstats_desc,\
+			 xmldesc, dnssecstats_xmldesc); \
+		dnssecstats_index[i++] = dns_dnssecstats_ ## counterid; \
+	} while (0)
+
+	i = 0;
+	SET_DNSSECSTATDESC(asis, "dnssec validation success with signer "
+			   "\"as is\"", "DNSSECasis");
+	SET_DNSSECSTATDESC(downcase, "dnssec validation success with signer "
+			   "lower cased", "DNSSECdowncase");
+	SET_DNSSECSTATDESC(wildcard, "dnssec validation of wildcard signature",
+			   "DNSSECwild");
+	SET_DNSSECSTATDESC(fail, "dnssec validation failures", "DNSSECfail");
+	INSIST(i == dns_dnssecstats_max);
+
 	/* Sanity check */
 	for (i = 0; i < dns_nsstatscounter_max; i++)
 		INSIST(nsstats_desc[i] != NULL);
@@ -418,6 +449,8 @@ init_desc(void) {
 		INSIST(zonestats_desc[i] != NULL);
 	for (i = 0; i < isc_sockstatscounter_max; i++)
 		INSIST(sockstats_desc[i] != NULL);
+	for (i = 0; i < dns_dnssecstats_max; i++)
+		INSIST(dnssecstats_desc[i] != NULL);
 #ifdef  HAVE_LIBXML2
 	for (i = 0; i < dns_nsstatscounter_max; i++)
 		INSIST(nsstats_xmldesc[i] != NULL);
@@ -427,6 +460,8 @@ init_desc(void) {
 		INSIST(zonestats_xmldesc[i] != NULL);
 	for (i = 0; i < isc_sockstatscounter_max; i++)
 		INSIST(sockstats_xmldesc[i] != NULL);
+	for (i = 0; i < dns_dnssecstats_max; i++)
+		INSIST(dnssecstats_xmldesc[i] != NULL);
 #endif
 }
 
diff --git a/bin/tests/system/dnssec/clean.sh b/bin/tests/system/dnssec/clean.sh
index d16e6b7ab8..70b117087e 100644
--- a/bin/tests/system/dnssec/clean.sh
+++ b/bin/tests/system/dnssec/clean.sh
@@ -60,5 +60,7 @@ rm -f signer/nsec3param.out
 rm -f ns3/ttlpatch.example.db ns3/ttlpatch.example.db.signed
 rm -f ns3/ttlpatch.example.db.patched
 rm -f ns3/split-smart.example.db
+rm -f ns3/lower.example.db ns3/upper.example.db ns3/upper.example.db.lower
 rm -f nosign.before
 rm -f signing.out*
+
diff --git a/bin/tests/system/dnssec/ns2/example.db.in b/bin/tests/system/dnssec/ns2/example.db.in
index 384c0b9636..8173387f31 100644
--- a/bin/tests/system/dnssec/ns2/example.db.in
+++ b/bin/tests/system/dnssec/ns2/example.db.in
@@ -138,3 +138,9 @@ ns.split-dnssec		A	10.53.0.3
 
 split-smart		NS	ns.split-smart
 ns.split-smart		A	10.53.0.3
+
+upper			NS	ns.upper
+ns.upper		A	10.53.0.3
+
+LOWER			NS	NS.LOWER
+NS.LOWER		A	10.53.0.3
diff --git a/bin/tests/system/dnssec/ns2/sign.sh b/bin/tests/system/dnssec/ns2/sign.sh
index 04a525b53f..0638cda66b 100644
--- a/bin/tests/system/dnssec/ns2/sign.sh
+++ b/bin/tests/system/dnssec/ns2/sign.sh
@@ -33,7 +33,7 @@ zonefile=example.db
 for subdomain in secure bogus dynamic keyless nsec3 optout nsec3-unknown \
     optout-unknown multiple rsasha256 rsasha512 kskonly update-nsec3 \
     auto-nsec auto-nsec3 secure.below-cname ttlpatch split-dnssec \
-    split-smart expired
+    split-smart expired upper lower
 do
 	cp ../ns3/dsset-$subdomain.example. .
 done
diff --git a/bin/tests/system/dnssec/ns3/lower.example.db.in b/bin/tests/system/dnssec/ns3/lower.example.db.in
new file mode 100644
index 0000000000..d71026cb34
--- /dev/null
+++ b/bin/tests/system/dnssec/ns3/lower.example.db.in
@@ -0,0 +1,26 @@
+; Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
+;
+; Permission to use, copy, modify, and/or distribute this software for any
+; purpose with or without fee is hereby granted, provided that the above
+; copyright notice and this permission notice appear in all copies.
+;
+; THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+; REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+; AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+; INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+; LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+; OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+; PERFORMANCE OF THIS SOFTWARE.
+
+; $Id: lower.example.db.in,v 1.1.2.1 2012/01/17 08:31:00 marka Exp $
+
+$TTL 300	; 5 minutes
+@			IN SOA	MNAME1. . (
+				2012042407 ; serial
+				20         ; refresh (20 seconds)
+				20         ; retry (20 seconds)
+				1814400    ; expire (3 weeks)
+				3600       ; minimum (1 hour)
+				)
+@			NS	NS
+NS			A	10.53.0.3
diff --git a/bin/tests/system/dnssec/ns3/named.conf b/bin/tests/system/dnssec/ns3/named.conf
index 060edca461..4133f8acf1 100644
--- a/bin/tests/system/dnssec/ns3/named.conf
+++ b/bin/tests/system/dnssec/ns3/named.conf
@@ -245,4 +245,14 @@ zone "nosign.example" {
 	file "nosign.example.db.signed";
 };
 
+zone "upper.example" {
+	type master;
+	file "upper.example.db.signed";
+};
+
+zone "LOWER.EXAMPLE" {
+	type master;
+	file "lower.example.db.signed";
+};
+
 include "trusted.conf";
diff --git a/bin/tests/system/dnssec/ns3/sign.sh b/bin/tests/system/dnssec/ns3/sign.sh
index fdca3b00df..1e99c30e07 100644
--- a/bin/tests/system/dnssec/ns3/sign.sh
+++ b/bin/tests/system/dnssec/ns3/sign.sh
@@ -383,6 +383,34 @@ cp $infile $zonefile
 $SIGNER -S -r $RANDFILE -e now+1mi -o $zone $zonefile > /dev/null 2>&1
 rm -f ${zskname}.private ${kskname}.private
 
+#
+# A zone where the signer's name has been forced to uppercase.
+#
+zone="upper.example."
+infile="upper.example.db.in"
+zonefile="upper.example.db"
+lower="upper.example.db.lower"
+signedfile="upper.example.db.signed"
+kskname=`$KEYGEN -q -r $RANDFILE $zone`
+zskname=`$KEYGEN -q -r $RANDFILE -f KSK $zone`
+cp $infile $zonefile
+$SIGNER -P -S -r $RANDFILE -o $zone -f $lower $zonefile > /dev/null 2>&1
+$CHECKZONE -D upper.example $lower 2>&- | \
+        awk '$4 == "RRSIG" {$12 = toupper($12); print; next} { print }' > $signedfile
+
+#
+# Check that the signer's name is in lower case when zone name is in
+# upper case.
+#
+zone="LOWER.EXAMPLE."
+infile="lower.example.db.in"
+zonefile="lower.example.db"
+signedfile="lower.example.db.signed"
+kskname=`$KEYGEN -q -r $RANDFILE $zone`
+zskname=`$KEYGEN -q -r $RANDFILE -f KSK $zone`
+cp $infile $zonefile
+$SIGNER -P -S -r $RANDFILE -o $zone $zonefile > /dev/null 2>&1
+
 #
 # Zone with signatures about to expire, and dynamic, but configured
 # not to resign with 'auto-resign no;'
diff --git a/bin/tests/system/dnssec/ns3/upper.example.db.in b/bin/tests/system/dnssec/ns3/upper.example.db.in
new file mode 100644
index 0000000000..52202fb31b
--- /dev/null
+++ b/bin/tests/system/dnssec/ns3/upper.example.db.in
@@ -0,0 +1,26 @@
+; Copyright (C) 2012  Internet Systems Consortium, Inc. ("ISC")
+;
+; Permission to use, copy, modify, and/or distribute this software for any
+; purpose with or without fee is hereby granted, provided that the above
+; copyright notice and this permission notice appear in all copies.
+;
+; THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
+; REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+; AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
+; INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+; LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
+; OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+; PERFORMANCE OF THIS SOFTWARE.
+
+; $Id: upper.example.db.in,v 1.1.2.1 2012/01/17 08:31:00 marka Exp $
+
+$TTL 300	; 5 minutes
+@			IN SOA	mname1. . (
+				2012042407 ; serial
+				20         ; refresh (20 seconds)
+				20         ; retry (20 seconds)
+				1814400    ; expire (3 weeks)
+				3600       ; minimum (1 hour)
+				)
+@			NS	ns
+ns			A	10.53.0.3
diff --git a/bin/tests/system/dnssec/tests.sh b/bin/tests/system/dnssec/tests.sh
index c34a583c42..6f695a89ae 100644
--- a/bin/tests/system/dnssec/tests.sh
+++ b/bin/tests/system/dnssec/tests.sh
@@ -1655,5 +1655,25 @@ n=`expr $n + 1`
 if [ $ret != 0 ]; then echo "I:failed"; fi
 status=`expr $status + $ret`
 
+echo "I:testing legacy upper case signer name validation ($n)"
+ret=0
+$DIG +tcp +dnssec -p 5300 +noadd +noauth soa upper.example @10.53.0.4 \
+        > dig.out.ns4.test$n 2>&1
+grep 'flags:.* ad;' dig.out.ns4.test$n >/dev/null || ret=1
+grep 'RRSIG.*SOA.* UPPER\.EXAMPLE\. ' dig.out.ns4.test$n > /dev/null || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
+echo "I:testing that we lower case signer name ($n)"
+ret=0
+$DIG +tcp +dnssec -p 5300 +noadd +noauth soa LOWER.EXAMPLE @10.53.0.4 \
+        > dig.out.ns4.test$n 2>&1
+grep 'flags:.* ad;' dig.out.ns4.test$n >/dev/null || ret=1
+grep 'RRSIG.*SOA.* lower\.example\. ' dig.out.ns4.test$n > /dev/null || ret=1
+n=`expr $n + 1`
+if [ $ret != 0 ]; then echo "I:failed"; fi
+status=`expr $status + $ret`
+
 echo "I:exit status: $status"
 exit $status
diff --git a/lib/dns/dnssec.c b/lib/dns/dnssec.c
index ed94525478..a88812cfe3 100644
--- a/lib/dns/dnssec.c
+++ b/lib/dns/dnssec.c
@@ -44,10 +44,13 @@
 #include <dns/rdataset.h>
 #include <dns/rdatastruct.h>
 #include <dns/result.h>
+#include <dns/stats.h>
 #include <dns/tsig.h>		/* for DNS_TSIG_FUDGE */
 
 #include <dst/result.h>
 
+LIBDNS_EXTERNAL_DATA isc_stats_t *dns_dnssec_stats;
+
 #define is_response(msg) (msg->flags & DNS_MESSAGEFLAG_QR)
 
 #define RETERR(x) do { \
@@ -77,6 +80,12 @@ digest_callback(void *arg, isc_region_t *data) {
 	return (dst_context_adddata(ctx, data));
 }
 
+static inline void
+inc_stat(isc_statscounter_t counter) {
+	if (dns_dnssec_stats != NULL)
+		isc_stats_increment(dns_dnssec_stats, counter);
+}
+
 /*
  * Make qsort happy.
  */
@@ -153,7 +162,9 @@ dns_dnssec_keyfromrdata(dns_name_t *name, dns_rdata_t *rdata, isc_mem_t *mctx,
 }
 
 static isc_result_t
-digest_sig(dst_context_t *ctx, dns_rdata_t *sigrdata, dns_rdata_rrsig_t *sig) {
+digest_sig(dst_context_t *ctx, isc_boolean_t downcase, dns_rdata_t *sigrdata,
+	   dns_rdata_rrsig_t *rrsig)
+{
 	isc_region_t r;
 	isc_result_t ret;
 	dns_fixedname_t fname;
@@ -165,11 +176,16 @@ digest_sig(dst_context_t *ctx, dns_rdata_t *sigrdata, dns_rdata_rrsig_t *sig) {
 	ret = dst_context_adddata(ctx, &r);
 	if (ret != ISC_R_SUCCESS)
 		return (ret);
-	dns_fixedname_init(&fname);
-	RUNTIME_CHECK(dns_name_downcase(&sig->signer,
-					dns_fixedname_name(&fname), NULL)
-		      == ISC_R_SUCCESS);
-	dns_name_toregion(dns_fixedname_name(&fname), &r);
+	if (downcase) {
+		dns_fixedname_init(&fname);
+
+		RUNTIME_CHECK(dns_name_downcase(&rrsig->signer,
+						dns_fixedname_name(&fname),
+						NULL) == ISC_R_SUCCESS);
+		dns_name_toregion(dns_fixedname_name(&fname), &r);
+	} else 
+		dns_name_toregion(&rrsig->signer, &r);
+	
 	return (dst_context_adddata(ctx, &r));
 }
 
@@ -191,6 +207,7 @@ dns_dnssec_sign(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	isc_uint32_t flags;
 	unsigned int sigsize;
 	dns_fixedname_t fnewname;
+	dns_fixedname_t fsigner;
 
 	REQUIRE(name != NULL);
 	REQUIRE(dns_name_countlabels(name) <= 255);
@@ -218,8 +235,14 @@ dns_dnssec_sign(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	sig.common.rdtype = dns_rdatatype_rrsig;
 	ISC_LINK_INIT(&sig.common, link);
 
+	/*
+	 * Downcase signer.
+	 */
 	dns_name_init(&sig.signer, NULL);
-	dns_name_clone(dst_key_name(key), &sig.signer);
+	dns_fixedname_init(&fsigner);
+	RUNTIME_CHECK(dns_name_downcase(dst_key_name(key),
+		      dns_fixedname_name(&fsigner), NULL) == ISC_R_SUCCESS);
+	dns_name_clone(dns_fixedname_name(&fsigner), &sig.signer);
 
 	sig.covered = set->type;
 	sig.algorithm = dst_key_alg(key);
@@ -259,7 +282,7 @@ dns_dnssec_sign(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	/*
 	 * Digest the SIG rdata.
 	 */
-	ret = digest_sig(ctx, &tmpsigrdata, &sig);
+	ret = digest_sig(ctx, ISC_FALSE, &tmpsigrdata, &sig);
 	if (ret != ISC_R_SUCCESS)
 		goto cleanup_context;
 
@@ -332,7 +355,7 @@ dns_dnssec_sign(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	memcpy(sig.signature, r.base, sig.siglen);
 
 	ret = dns_rdata_fromstruct(sigrdata, sig.common.rdclass,
-				  sig.common.rdtype, &sig, buffer);
+				   sig.common.rdtype, &sig, buffer);
 
 cleanup_array:
 	isc_mem_put(mctx, rdatas, nrdatas * sizeof(dns_rdata_t));
@@ -363,6 +386,7 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	dst_context_t *ctx = NULL;
 	int labels = 0;
 	isc_uint32_t flags;
+	isc_boolean_t downcase = ISC_FALSE;
 
 	REQUIRE(name != NULL);
 	REQUIRE(set != NULL);
@@ -377,8 +401,10 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	if (set->type != sig.covered)
 		return (DNS_R_SIGINVALID);
 
-	if (isc_serial_lt(sig.timeexpire, sig.timesigned))
+	if (isc_serial_lt(sig.timeexpire, sig.timesigned)) {
+		inc_stat(dns_dnssecstats_fail);
 		return (DNS_R_SIGINVALID);
+	}
 
 	if (!ignoretime) {
 		isc_stdtime_get(&now);
@@ -386,10 +412,13 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 		/*
 		 * Is SIG temporally valid?
 		 */
-		if (isc_serial_lt((isc_uint32_t)now, sig.timesigned))
+		if (isc_serial_lt((isc_uint32_t)now, sig.timesigned)) {
+			inc_stat(dns_dnssecstats_fail);
 			return (DNS_R_SIGFUTURE);
-		else if (isc_serial_lt(sig.timeexpire, (isc_uint32_t)now))
+		} else if (isc_serial_lt(sig.timeexpire, (isc_uint32_t)now)) {
+			inc_stat(dns_dnssecstats_fail);
 			return (DNS_R_SIGEXPIRED);
+		}
 	}
 
 	/*
@@ -400,16 +429,22 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	case dns_rdatatype_ns:
 	case dns_rdatatype_soa:
 	case dns_rdatatype_dnskey:
-		if (!dns_name_equal(name, &sig.signer))
+		if (!dns_name_equal(name, &sig.signer)) {
+			inc_stat(dns_dnssecstats_fail);
 			return (DNS_R_SIGINVALID);
+		}
 		break;
 	case dns_rdatatype_ds:
-		if (dns_name_equal(name, &sig.signer))
+		if (dns_name_equal(name, &sig.signer)) {
+			inc_stat(dns_dnssecstats_fail);
 			return (DNS_R_SIGINVALID);
+		}
 		/* FALLTHROUGH */
 	default:
-		if (!dns_name_issubdomain(name, &sig.signer))
+		if (!dns_name_issubdomain(name, &sig.signer)) {
+			inc_stat(dns_dnssecstats_fail);
 			return (DNS_R_SIGINVALID);
+		}
 		break;
 	}
 
@@ -417,11 +452,16 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	 * Is the key allowed to sign data?
 	 */
 	flags = dst_key_flags(key);
-	if (flags & DNS_KEYTYPE_NOAUTH)
+	if (flags & DNS_KEYTYPE_NOAUTH) {
+		inc_stat(dns_dnssecstats_fail);
 		return (DNS_R_KEYUNAUTHORIZED);
-	if ((flags & DNS_KEYFLAG_OWNERMASK) != DNS_KEYOWNER_ZONE)
+	}
+	if ((flags & DNS_KEYFLAG_OWNERMASK) != DNS_KEYOWNER_ZONE) {
+		inc_stat(dns_dnssecstats_fail);
 		return (DNS_R_KEYUNAUTHORIZED);
+	}
 
+ again:
 	ret = dst_context_create(key, mctx, &ctx);
 	if (ret != ISC_R_SUCCESS)
 		goto cleanup_struct;
@@ -429,7 +469,7 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	/*
 	 * Digest the SIG rdata (not including the signature).
 	 */
-	ret = digest_sig(ctx, sigrdata, &sig);
+	ret = digest_sig(ctx, downcase, sigrdata, &sig);
 	if (ret != ISC_R_SUCCESS)
 		goto cleanup_context;
 
@@ -508,21 +548,40 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 	r.base = sig.signature;
 	r.length = sig.siglen;
 	ret = dst_context_verify(ctx, &r);
-	if (ret == DST_R_VERIFYFAILURE)
-		ret = DNS_R_SIGINVALID;
+	if (ret == ISC_R_SUCCESS && downcase) {
+		char namebuf[DNS_NAME_FORMATSIZE];
+		dns_name_format(&sig.signer, namebuf, sizeof(namebuf));
+		isc_log_write(dns_lctx, DNS_LOGCATEGORY_GENERAL,
+			      DNS_LOGMODULE_DNSSEC, ISC_LOG_INFO,
+			      "sucessfully validated after lower casing "
+			      "signer '%s'", namebuf);
+		inc_stat(dns_dnssecstats_downcase);
+	} else if (ret == ISC_R_SUCCESS)
+		inc_stat(dns_dnssecstats_asis);
 
 cleanup_array:
 	isc_mem_put(mctx, rdatas, nrdatas * sizeof(dns_rdata_t));
 cleanup_context:
 	dst_context_destroy(&ctx);
+	if (ret == DST_R_VERIFYFAILURE && !downcase) {
+		downcase = ISC_TRUE;
+		goto again;
+	}
 cleanup_struct:
 	dns_rdata_freestruct(&sig);
 
+	if (ret == DST_R_VERIFYFAILURE)
+		ret = DNS_R_SIGINVALID;
+
+	if (ret != ISC_R_SUCCESS)
+		inc_stat(dns_dnssecstats_fail);
+
 	if (ret == ISC_R_SUCCESS && labels - sig.labels > 0) {
 		if (wild != NULL)
 			RUNTIME_CHECK(dns_name_concatenate(dns_wildcardname,
 						 dns_fixedname_name(&fnewname),
 						 wild, NULL) == ISC_R_SUCCESS);
+		inc_stat(dns_dnssecstats_wildcard);
 		ret = DNS_R_FROMWILDCARD;
 	}
 	return (ret);
diff --git a/lib/dns/include/dns/dnssec.h b/lib/dns/include/dns/dnssec.h
index 68df540ab0..c8a5e6fddc 100644
--- a/lib/dns/include/dns/dnssec.h
+++ b/lib/dns/include/dns/dnssec.h
@@ -24,6 +24,7 @@
 
 #include <isc/lang.h>
 #include <isc/stdtime.h>
+#include <isc/stats.h>
 
 #include <dns/diff.h>
 #include <dns/types.h>
@@ -32,6 +33,8 @@
 
 ISC_LANG_BEGINDECLS
 
+LIBDNS_EXTERNAL_DATA extern isc_stats_t *dns_dnssec_stats;
+
 /*%< Maximum number of keys supported in a zone. */
 #define DNS_MAXZONEKEYS 32
 
@@ -96,8 +99,8 @@ dns_dnssec_sign(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 		isc_stdtime_t *inception, isc_stdtime_t *expire,
 		isc_mem_t *mctx, isc_buffer_t *buffer, dns_rdata_t *sigrdata);
 /*%<
- *	Generates a SIG record covering this rdataset.  This has no effect
- *	on existing SIG records.
+ *	Generates a RRSIG record covering this rdataset.  This has no effect
+ *	on existing RRSIG records.
  *
  *	Requires:
  *\li		'name' (the owner name of the record) is a valid name
@@ -130,9 +133,9 @@ dns_dnssec_verify2(dns_name_t *name, dns_rdataset_t *set, dst_key_t *key,
 		   isc_boolean_t ignoretime, isc_mem_t *mctx,
 		   dns_rdata_t *sigrdata, dns_name_t *wild);
 /*%<
- *	Verifies the SIG record covering this rdataset signed by a specific
- *	key.  This does not determine if the key's owner is authorized to
- *	sign this record, as this requires a resolver or database.
+ *	Verifies the RRSIG record covering this rdataset signed by a specific
+ *	key.  This does not determine if the key's owner is authorized to sign
+ *	this record, as this requires a resolver or database.
  *	If 'ignoretime' is ISC_TRUE, temporal validity will not be checked.
  *
  *	Requires:
diff --git a/lib/dns/include/dns/stats.h b/lib/dns/include/dns/stats.h
index bc77d1e9c5..5364267272 100644
--- a/lib/dns/include/dns/stats.h
+++ b/lib/dns/include/dns/stats.h
@@ -64,6 +64,16 @@ enum {
 
 	dns_resstatscounter_max = 30,
 
+	/*
+	 * DNSSEC stats.
+	 */
+	dns_dnssecstats_asis = 0,
+	dns_dnssecstats_downcase = 1,
+	dns_dnssecstats_wildcard = 2,
+	dns_dnssecstats_fail = 3,
+
+	dns_dnssecstats_max = 4,
+
 	/*%
 	 * Zone statistics counters.
 	 */