[crypto] Add MD4 message digest algorithm

Signed-off-by: Michael Brown <mcb30@ipxe.org>

src/include/ipxe/asn1.h

@@ -161,6 +161,12 @@ struct asn1_builder_header {
 	ASN1_OID_TRIPLE ( 113549 ), ASN1_OID_SINGLE ( 1 ),	\
 	ASN1_OID_SINGLE ( 1 ), ASN1_OID_SINGLE ( 14 )
 
+/** ASN.1 OID for id-md4 (1.2.840.113549.2.4) */
+#define ASN1_OID_MD4						\
+	ASN1_OID_INITIAL ( 1, 2 ), ASN1_OID_DOUBLE ( 840 ),	\
+	ASN1_OID_TRIPLE ( 113549 ), ASN1_OID_SINGLE ( 2 ),	\
+	ASN1_OID_SINGLE ( 4 )
+
 /** ASN.1 OID for id-md5 (1.2.840.113549.2.5) */
 #define ASN1_OID_MD5						\
 	ASN1_OID_INITIAL ( 1, 2 ), ASN1_OID_DOUBLE ( 840 ),	\

src/include/ipxe/md4.h

@@ -0,0 +1,73 @@
+#ifndef _IPXE_MD4_H
+#define _IPXE_MD4_H
+
+/** @file
+ *
+ * MD4 algorithm
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
+
+#include <stdint.h>
+#include <ipxe/crypto.h>
+
+/** An MD4 digest */
+struct md4_digest {
+	/** Hash output */
+	uint32_t h[4];
+};
+
+/** An MD4 data block */
+union md4_block {
+	/** Raw bytes */
+	uint8_t byte[64];
+	/** Raw dwords */
+	uint32_t dword[16];
+	/** Final block structure */
+	struct {
+		/** Padding */
+		uint8_t pad[56];
+		/** Length in bits */
+		uint64_t len;
+	} final;
+};
+
+/** MD4 digest and data block
+ *
+ * The order of fields within this structure is designed to minimise
+ * code size.
+ */
+struct md4_digest_data {
+	/** Digest of data already processed */
+	struct md4_digest digest;
+	/** Accumulated data */
+	union md4_block data;
+} __attribute__ (( packed ));
+
+/** MD4 digest and data block */
+union md4_digest_data_dwords {
+	/** Digest and data block */
+	struct md4_digest_data dd;
+	/** Raw dwords */
+	uint32_t dword[ sizeof ( struct md4_digest_data ) /
+			sizeof ( uint32_t ) ];
+};
+
+/** An MD4 context */
+struct md4_context {
+	/** Amount of accumulated data */
+	size_t len;
+	/** Digest and accumulated data */
+	union md4_digest_data_dwords ddd;
+} __attribute__ (( packed ));
+
+/** MD4 context size */
+#define MD4_CTX_SIZE sizeof ( struct md4_context )
+
+/** MD4 digest size */
+#define MD4_DIGEST_SIZE sizeof ( struct md4_digest )
+
+extern struct digest_algorithm md4_algorithm;
+
+#endif /* _IPXE_MD4_H */