diff --git a/lib/krb5/crypto-des-common.c b/lib/krb5/crypto-des-common.c
index c85bd2433..b6d765066 100644
--- a/lib/krb5/crypto-des-common.c
+++ b/lib/krb5/crypto-des-common.c
@@ -92,8 +92,8 @@ KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
 _krb5_des_verify(krb5_context context,
 		 const EVP_MD *evp_md,
 		 struct _krb5_key_data *key,
-		 const void *data,
-		 size_t len,
+		 const struct krb5_crypto_iov *iov,
+		 int niov,
 		 Checksum *C)
 {
     struct _krb5_evp_schedule *ctx = key->schedule->data;
@@ -102,6 +102,7 @@ _krb5_des_verify(krb5_context context,
     unsigned char res[16];
     DES_cblock ivec;
     krb5_error_code ret = 0;
+    int i;
 
     m = EVP_MD_CTX_create();
     if (m == NULL)
@@ -113,7 +114,10 @@ _krb5_des_verify(krb5_context context,
 
     EVP_DigestInit_ex(m, evp_md, NULL);
     EVP_DigestUpdate(m, tmp, 8); /* confounder */
-    EVP_DigestUpdate(m, data, len);
+    for (i = 0; i < niov; i++) {
+	if (_krb5_crypto_iov_should_sign(&iov[i]))
+	    EVP_DigestUpdate(m, iov[i].data.data, iov[i].data.length);
+    }
     EVP_DigestFinal_ex (m, res, NULL);
     EVP_MD_CTX_destroy(m);
     if(ct_memcmp(res, tmp + 8, sizeof(res)) != 0) {
diff --git a/lib/krb5/crypto-des.c b/lib/krb5/crypto-des.c
index 017ce106f..152c01550 100644
--- a/lib/krb5/crypto-des.c
+++ b/lib/krb5/crypto-des.c
@@ -149,12 +149,12 @@ RSA_MD4_DES_checksum(krb5_context context,
 static krb5_error_code
 RSA_MD4_DES_verify(krb5_context context,
 		   struct _krb5_key_data *key,
-		   const void *data,
-		   size_t len,
 		   unsigned usage,
+                   const struct krb5_crypto_iov *iov,
+                   int niov,
 		   Checksum *C)
 {
-    return _krb5_des_verify(context, EVP_md4(), key, data, len, C);
+    return _krb5_des_verify(context, EVP_md4(), key, iov, niov, C);
 }
 
 static krb5_error_code
@@ -171,12 +171,12 @@ RSA_MD5_DES_checksum(krb5_context context,
 static krb5_error_code
 RSA_MD5_DES_verify(krb5_context context,
 		   struct _krb5_key_data *key,
-		   const void *data,
-		   size_t len,
 		   unsigned usage,
+                   const struct krb5_crypto_iov *iov,
+                   int niov,
 		   Checksum *C)
 {
-    return _krb5_des_verify(context, EVP_md5(), key, data, len, C);
+    return _krb5_des_verify(context, EVP_md5(), key, iov, niov, C);
 }
 
 struct _krb5_checksum_type _krb5_checksum_crc32 = {
diff --git a/lib/krb5/crypto-des3.c b/lib/krb5/crypto-des3.c
index 36174ff7f..98faed853 100644
--- a/lib/krb5/crypto-des3.c
+++ b/lib/krb5/crypto-des3.c
@@ -154,12 +154,12 @@ RSA_MD5_DES3_checksum(krb5_context context,
 static krb5_error_code
 RSA_MD5_DES3_verify(krb5_context context,
 		    struct _krb5_key_data *key,
-		    const void *data,
-		    size_t len,
 		    unsigned usage,
+                    const struct krb5_crypto_iov *iov,
+                    int niov,
 		    Checksum *C)
 {
-    return _krb5_des_verify(context, EVP_md5(), key, data, len, C);
+    return _krb5_des_verify(context, EVP_md5(), key, iov, niov, C);
 }
 
 struct _krb5_checksum_type _krb5_checksum_rsa_md5_des3 = {
diff --git a/lib/krb5/crypto.c b/lib/krb5/crypto.c
index 04ace4151..f2c9e4595 100644
--- a/lib/krb5/crypto.c
+++ b/lib/krb5/crypto.c
@@ -286,6 +286,7 @@ krb5_hmac(krb5_context context,
 {
     struct _krb5_checksum_type *c = _krb5_find_checksum(cktype);
     struct _krb5_key_data kd;
+
     krb5_error_code ret;
 
     if (c == NULL) {
@@ -524,7 +525,7 @@ verify_checksum(krb5_context context,
     iov[0].flags = KRB5_CRYPTO_TYPE_DATA;
 
     if(ct->verify) {
-	ret = (*ct->verify)(context, dkey, data, len, usage, cksum);
+	ret = (*ct->verify)(context, dkey, usage, iov, 1, cksum);
 	if (ret)
 	    krb5_set_error_message(context, ret,
 				   N_("Decrypt integrity check failed for checksum "
diff --git a/lib/krb5/crypto.h b/lib/krb5/crypto.h
index f1ed1a5a3..1480e5ea4 100644
--- a/lib/krb5/crypto.h
+++ b/lib/krb5/crypto.h
@@ -103,8 +103,8 @@ struct _krb5_checksum_type {
 				Checksum *csum);
     krb5_error_code (*verify)(krb5_context context,
 			      struct _krb5_key_data *key,
-			      const void *buf, size_t len,
 			      unsigned usage,
+			      const struct krb5_crypto_iov *iov, int niov,
 			      Checksum *csum);
 };