diff --git a/src/crypto/md5.c b/src/crypto/md5.c
index 2d0d03d1..b8b7b43d 100644
--- a/src/crypto/md5.c
+++ b/src/crypto/md5.c
@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <assert.h>
 #include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
+#include <ipxe/asn1.h>
 #include <ipxe/md5.h>
 
 /** MD5 variables */
@@ -284,3 +285,13 @@ struct digest_algorithm md5_algorithm = {
 	.update		= md5_update,
 	.final		= md5_final,
 };
+
+/** "md5" object identifier */
+static uint8_t oid_md5[] = { ASN1_OID_MD5 };
+
+/** "md5" OID-identified algorithm */
+struct asn1_algorithm oid_md5_algorithm __asn1_algorithm = {
+	.name = "md5",
+	.digest = &md5_algorithm,
+	.oid = ASN1_OID_CURSOR ( oid_md5 ),
+};
diff --git a/src/crypto/sha1.c b/src/crypto/sha1.c
index fd271a63..7f287d3c 100644
--- a/src/crypto/sha1.c
+++ b/src/crypto/sha1.c
@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <assert.h>
 #include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
+#include <ipxe/asn1.h>
 #include <ipxe/sha1.h>
 
 /** SHA-1 variables */
@@ -258,3 +259,13 @@ struct digest_algorithm sha1_algorithm = {
 	.update		= sha1_update,
 	.final		= sha1_final,
 };
+
+/** "sha1" object identifier */
+static uint8_t oid_sha1[] = { ASN1_OID_SHA1 };
+
+/** "sha1" OID-identified algorithm */
+struct asn1_algorithm oid_sha1_algorithm __asn1_algorithm = {
+	.name = "sha1",
+	.digest = &sha1_algorithm,
+	.oid = ASN1_OID_CURSOR ( oid_sha1 ),
+};
diff --git a/src/crypto/sha256.c b/src/crypto/sha256.c
index 6736a577..e85d2006 100644
--- a/src/crypto/sha256.c
+++ b/src/crypto/sha256.c
@@ -30,6 +30,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <assert.h>
 #include <ipxe/rotate.h>
 #include <ipxe/crypto.h>
+#include <ipxe/asn1.h>
 #include <ipxe/sha256.h>
 
 /** SHA-256 variables */
@@ -242,3 +243,13 @@ struct digest_algorithm sha256_algorithm = {
 	.update		= sha256_update,
 	.final		= sha256_final,
 };
+
+/** "sha256" object identifier */
+static uint8_t oid_sha256[] = { ASN1_OID_SHA256 };
+
+/** "sha256" OID-identified algorithm */
+struct asn1_algorithm oid_sha256_algorithm __asn1_algorithm = {
+	.name = "sha256",
+	.digest = &sha256_algorithm,
+	.oid = ASN1_OID_CURSOR ( oid_sha256 ),
+};