105 lines
2.2 KiB
C
105 lines
2.2 KiB
C
/*
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* MD5 interface for rsaref2.0
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*
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* These routines implement an interface for the RSA Laboratories
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* implementation of the Message Digest 5 (MD5) algorithm. This
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* algorithm is included in the rsaref2.0 package available from RSA in
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* the US and foreign countries. Further information is available at
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* www.rsa.com.
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "ntp_fp.h"
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#include "ntp_string.h"
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#include "ntp_stdlib.h"
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/* Disable the openssl md5 includes, because they'd clash with ours. */
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/* #define NO_MD5 */
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/* #define OPENSSL_NO_MD5 */
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#undef OPENSSL
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#include "ntp.h"
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#include "global.h"
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#include "ntp_md5.h"
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/*
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* MD5authencrypt - generate MD5 message authenticator
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*
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* Returns length of authenticator field.
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*/
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int
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MD5authencrypt(
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u_char *key, /* key pointer */
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u_int32 *pkt, /* packet pointer */
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int length /* packet length */
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)
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{
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MD5_CTX md5;
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u_char digest[16];
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/*
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* MD5 with key identifier concatenated with packet.
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*/
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MD5Init(&md5);
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MD5Update(&md5, key, (u_int)cache_keylen);
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MD5Update(&md5, (u_char *)pkt, (u_int)length);
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MD5Final(digest, &md5);
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memmove((u_char *)pkt + length + 4, digest, 16);
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return (16 + 4);
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}
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/*
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* MD5authdecrypt - verify MD5 message authenticator
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*
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* Returns one if authenticator valid, zero if invalid.
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*/
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int
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MD5authdecrypt(
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u_char *key, /* key pointer */
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u_int32 *pkt, /* packet pointer */
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int length, /* packet length */
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int size /* MAC size */
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)
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{
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MD5_CTX md5;
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u_char digest[16];
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/*
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* MD5 with key identifier concatenated with packet.
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*/
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MD5Init(&md5);
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MD5Update(&md5, key, (u_int)cache_keylen);
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MD5Update(&md5, (u_char *)pkt, (u_int)length);
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MD5Final(digest, &md5);
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if (size != 16 + 4)
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return (0);
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return (!memcmp(digest, (char *)pkt + length + 4, 16));
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}
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/*
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* Calculate the reference id from the address. If it is an IPv4
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* address, use it as is. If it is an IPv6 address, do a md5 on
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* it and use the bottom 4 bytes.
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*/
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u_int32
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addr2refid(struct sockaddr_storage *addr)
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{
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MD5_CTX md5;
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u_char digest[16];
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u_int32 addr_refid;
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if (addr->ss_family == AF_INET)
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return (GET_INADDR(*addr));
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MD5Init(&md5);
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MD5Update(&md5, (u_char *)&GET_INADDR6(*addr),
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sizeof(struct in6_addr));
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MD5Final(digest, &md5);
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memcpy(&addr_refid, digest, 4);
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return (addr_refid);
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}
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