1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 #pragma ident "%Z%%M% %I% %E% SMI" 7 8 /* 9 * lib/crypto/keyhash_provider/hmac_md5.c 10 * 11 (I don't know) 12 . 13 * Copyright2001 by the Massachusetts Institute of Technology. 14 * All Rights Reserved. 15 * 16 * Export of this software from the United States of America may 17 * require a specific license from the United States Government. 18 * It is the responsibility of any person or organization contemplating 19 * export to obtain such a license before exporting. 20 * 21 * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and 22 * distribute this software and its documentation for any purpose and 23 * without fee is hereby granted, provided that the above copyright 24 * notice appear in all copies and that both that copyright notice and 25 * this permission notice appear in supporting documentation, and that 26 * the name of M.I.T. not be used in advertising or publicity pertaining 27 * to distribution of the software without specific, written prior 28 * permission. Furthermore if you modify this software you must label 29 * your software as modified software and not distribute it in such a 30 * fashion that it might be confused with the original M.I.T. software. 31 * M.I.T. makes no representations about the suitability of 32 * this software for any purpose. It is provided "as is" without express 33 * or implied warranty. 34 * 35 * 36 * Implementation of the Microsoft hmac-md5 checksum type. 37 * Implemented based on draft-brezak-win2k-krb-rc4-hmac-03 38 */ 39 40 #include <k5-int.h> 41 #include <arcfour.h> 42 #include <hash_provider.h> 43 #include <keyhash_provider.h> 44 45 static krb5_error_code 46 k5_hmac_md5_hash (krb5_context context, 47 const krb5_keyblock *key, krb5_keyusage usage, 48 const krb5_data *iv, 49 const krb5_data *input, krb5_data *output) 50 { 51 krb5_keyusage ms_usage; 52 krb5_error_code ret; 53 krb5_keyblock ks; 54 krb5_data ds, ks_constant, md5tmp; 55 krb5_data hash_input[2]; 56 char digest[MD5_CKSUM_LENGTH]; 57 char t[4]; 58 CK_MECHANISM mechanism; 59 CK_RV rv; 60 CK_ULONG hashlen; 61 62 bzero(&ks, sizeof(krb5_keyblock)); 63 ds.length = key->length; 64 ks.length = key->length; 65 ds.data = malloc(ds.length); 66 if (ds.data == NULL) 67 return (ENOMEM); 68 ks.contents = (void *) ds.data; 69 70 ks_constant.data = "signaturekey"; 71 ks_constant.length = strlen(ks_constant.data)+1; /* Including null*/ 72 73 ret = krb5_hmac(context, &krb5int_hash_md5, key, 1, 74 &ks_constant, &ds); 75 if (ret) 76 goto cleanup; 77 78 ms_usage = krb5int_arcfour_translate_usage (usage); 79 t[0] = (ms_usage) & 0xff; 80 t[1] = (ms_usage>>8) & 0xff; 81 t[2] = (ms_usage >>16) & 0xff; 82 t[3] = (ms_usage>>24) & 0XFF; 83 84 mechanism.mechanism = CKM_MD5; 85 mechanism.pParameter = NULL_PTR; 86 mechanism.ulParameterLen = 0; 87 88 if ((rv = C_DigestInit(krb_ctx_hSession(context), &mechanism)) != CKR_OK) { 89 KRB5_LOG(KRB5_ERR, "C_DigestInit failed in k5_md5_hmac_hash: " 90 "rv = 0x%x.", rv); 91 ret = PKCS_ERR; 92 goto cleanup; 93 } 94 if ((rv = C_DigestUpdate(krb_ctx_hSession(context), 95 (CK_BYTE_PTR)t, (CK_ULONG)sizeof(t))) != CKR_OK) { 96 KRB5_LOG(KRB5_ERR, "C_DigestUpdate 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)input->data, (CK_ULONG)input->length)) != 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 hashlen = MD5_CKSUM_LENGTH; 109 if ((rv = C_DigestFinal(krb_ctx_hSession(context), 110 (CK_BYTE_PTR)digest, (CK_ULONG_PTR)&hashlen)) != CKR_OK) { 111 KRB5_LOG(KRB5_ERR, "C_DigestFinal failed in k5_md5_hmac_hash: " 112 "rv = 0x%x", rv); 113 ret = PKCS_ERR; 114 goto cleanup; 115 } 116 117 md5tmp.data = digest; 118 md5tmp.length = hashlen; 119 120 ret = krb5_hmac (context, &krb5int_hash_md5, &ks, 1, &md5tmp, output); 121 122 cleanup: 123 bzero(ks.contents, ks.length); 124 bzero(md5tmp.data, md5tmp.length); 125 FREE (ks.contents, ks.length); 126 return (ret); 127 } 128 129 const struct krb5_keyhash_provider 130 krb5int_keyhash_hmac_md5 = { 131 16, 132 k5_hmac_md5_hash, 133 NULL /*checksum again*/ 134 }; 135 136