1 /* 2 * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* 7 * lib/crypto/keyhash_provider/hmac_md5.c 8 * 9 (I don't know) 10 . 11 * Copyright2001 by the Massachusetts Institute of Technology. 12 * All Rights Reserved. 13 * 14 * Export of this software from the United States of America may 15 * require a specific license from the United States Government. 16 * It is the responsibility of any person or organization contemplating 17 * export to obtain such a license before exporting. 18 * 19 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 20 * distribute this software and its documentation for any purpose and 21 * without fee is hereby granted, provided that the above copyright 22 * notice appear in all copies and that both that copyright notice and 23 * this permission notice appear in supporting documentation, and that 24 * the name of M.I.T. not be used in advertising or publicity pertaining 25 * to distribution of the software without specific, written prior 26 * permission. Furthermore if you modify this software you must label 27 * your software as modified software and not distribute it in such a 28 * fashion that it might be confused with the original M.I.T. software. 29 * M.I.T. makes no representations about the suitability of 30 * this software for any purpose. It is provided "as is" without express 31 * or implied warranty. 32 * 33 * 34 * Implementation of the Microsoft hmac-md5 checksum type. 35 * Implemented based on draft-brezak-win2k-krb-rc4-hmac-03 36 */ 37 38 #include "k5-int.h" 39 #include "keyhash_provider.h" 40 #include "arcfour.h" 41 #include "hash_provider.h" 42 43 static krb5_error_code k5_hmac_md5_hash(krb5_context context,const krb5_keyblock * key,krb5_keyusage usage,const krb5_data * iv,const krb5_data * input,krb5_data * output)44 k5_hmac_md5_hash (krb5_context context, 45 const krb5_keyblock *key, krb5_keyusage usage, 46 const krb5_data *iv, 47 const krb5_data *input, krb5_data *output) 48 { 49 krb5_keyusage ms_usage; 50 krb5_error_code ret; 51 krb5_keyblock ks; 52 krb5_data ds, ks_constant, md5tmp; 53 krb5_data hash_input[2]; 54 char digest[MD5_CKSUM_LENGTH]; 55 char t[4]; 56 CK_MECHANISM mechanism; 57 CK_RV rv; 58 CK_ULONG hashlen; 59 60 bzero(&ks, sizeof(krb5_keyblock)); 61 62 /* 63 * Solaris Kerberos: The digest length is that of MD5_CKSUM_LENGTH not the key 64 * length, as keys can be of varying lengths but should not affect the digest 65 * length. The signing key is the digest and therefore is also the same 66 * length, MD5_CKSUM_LENGTH. 67 */ 68 ds.length = MD5_CKSUM_LENGTH; 69 ks.length = MD5_CKSUM_LENGTH; 70 ds.data = malloc(ds.length); 71 if (ds.data == NULL) 72 return ENOMEM; 73 ks.contents = (void *) ds.data; 74 75 ks_constant.data = "signaturekey"; 76 ks_constant.length = strlen(ks_constant.data)+1; /* Including null*/ 77 78 /* Solaris Kerberos */ 79 ret = krb5_hmac(context, &krb5int_hash_md5, key, 1, 80 &ks_constant, &ds); 81 if (ret) 82 goto cleanup; 83 84 ms_usage = krb5int_arcfour_translate_usage (usage); 85 t[0] = (ms_usage) & 0xff; 86 t[1] = (ms_usage>>8) & 0xff; 87 t[2] = (ms_usage >>16) & 0xff; 88 t[3] = (ms_usage>>24) & 0XFF; 89 90 /* Solaris Kerberos */ 91 mechanism.mechanism = CKM_MD5; 92 mechanism.pParameter = NULL_PTR; 93 mechanism.ulParameterLen = 0; 94 95 if ((rv = C_DigestInit(krb_ctx_hSession(context), &mechanism)) != CKR_OK) { 96 KRB5_LOG(KRB5_ERR, "C_DigestInit failed in k5_md5_hmac_hash: " 97 "rv = 0x%x.", rv); 98 ret = PKCS_ERR; 99 goto cleanup; 100 } 101 if ((rv = C_DigestUpdate(krb_ctx_hSession(context), 102 (CK_BYTE_PTR)t, (CK_ULONG)sizeof(t))) != CKR_OK) { 103 KRB5_LOG(KRB5_ERR, "C_DigestUpdate failed in k5_md5_hmac_hash: " 104 "rv = 0x%x", rv); 105 ret = PKCS_ERR; 106 goto cleanup; 107 } 108 if ((rv = C_DigestUpdate(krb_ctx_hSession(context), 109 (CK_BYTE_PTR)input->data, (CK_ULONG)input->length)) != CKR_OK) { 110 KRB5_LOG(KRB5_ERR, "C_DigestUpdate failed in k5_md5_hmac_hash: " 111 "rv = 0x%x", rv); 112 ret = PKCS_ERR; 113 goto cleanup; 114 } 115 hashlen = MD5_CKSUM_LENGTH; 116 if ((rv = C_DigestFinal(krb_ctx_hSession(context), 117 (CK_BYTE_PTR)digest, (CK_ULONG_PTR)&hashlen)) != CKR_OK) { 118 KRB5_LOG(KRB5_ERR, "C_DigestFinal failed in k5_md5_hmac_hash: " 119 "rv = 0x%x", rv); 120 ret = PKCS_ERR; 121 goto cleanup; 122 } 123 124 md5tmp.data = digest; 125 md5tmp.length = hashlen; 126 127 ret = krb5_hmac (context, &krb5int_hash_md5, &ks, 1, &md5tmp, output); 128 129 cleanup: 130 bzero(ks.contents, ks.length); 131 bzero(md5tmp.data, md5tmp.length); 132 FREE (ks.contents, ks.length); 133 return (ret); 134 } 135 136 137 138 const struct krb5_keyhash_provider krb5int_keyhash_hmac_md5 = { 139 16, 140 k5_hmac_md5_hash, 141 NULL /*checksum again*/ 142 }; 143 144