security/nss/lib/softoken/sftkhmac.c@b8a032363ba2
security/nss/lib/softoken/sftkhmac.c
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
1 /* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
5 #include "seccomon.h"
6 #include "secerr.h"
7 #include "blapi.h"
8 #include "pkcs11i.h"
9 #include "softoken.h"
10 #include "hmacct.h"
12 /* MACMechanismToHash converts a PKCS#11 MAC mechanism into a freebl hash
13 * type. */
14 static HASH_HashType
15 MACMechanismToHash(CK_MECHANISM_TYPE mech)
16 {
17 switch (mech) {
18 case CKM_MD5_HMAC:
19 case CKM_SSL3_MD5_MAC:
20 return HASH_AlgMD5;
21 case CKM_SHA_1_HMAC:
22 case CKM_SSL3_SHA1_MAC:
23 return HASH_AlgSHA1;
24 case CKM_SHA224_HMAC:
25 return HASH_AlgSHA224;
26 case CKM_SHA256_HMAC:
27 return HASH_AlgSHA256;
28 case CKM_SHA384_HMAC:
29 return HASH_AlgSHA384;
30 case CKM_SHA512_HMAC:
31 return HASH_AlgSHA512;
32 }
33 return HASH_AlgNULL;
34 }
36 static sftk_MACConstantTimeCtx *
37 SetupMAC(CK_MECHANISM_PTR mech, SFTKObject *key)
38 {
39 CK_NSS_MAC_CONSTANT_TIME_PARAMS *params =
40 (CK_NSS_MAC_CONSTANT_TIME_PARAMS *) mech->pParameter;
41 sftk_MACConstantTimeCtx *ctx;
42 HASH_HashType alg;
43 SFTKAttribute *keyval;
44 unsigned char secret[sizeof(ctx->secret)];
45 unsigned int secretLength;
47 if (mech->ulParameterLen != sizeof(CK_NSS_MAC_CONSTANT_TIME_PARAMS)) {
48 return NULL;
49 }
51 alg = MACMechanismToHash(params->macAlg);
52 if (alg == HASH_AlgNULL) {
53 return NULL;
54 }
56 keyval = sftk_FindAttribute(key,CKA_VALUE);
57 if (keyval == NULL) {
58 return NULL;
59 }
60 secretLength = keyval->attrib.ulValueLen;
61 if (secretLength > sizeof(secret)) {
62 sftk_FreeAttribute(keyval);
63 return NULL;
64 }
65 memcpy(secret, keyval->attrib.pValue, secretLength);
66 sftk_FreeAttribute(keyval);
68 ctx = PORT_Alloc(sizeof(sftk_MACConstantTimeCtx));
69 if (!ctx) {
70 return NULL;
71 }
73 memcpy(ctx->secret, secret, secretLength);
74 ctx->secretLength = secretLength;
75 ctx->hash = HASH_GetRawHashObject(alg);
76 ctx->totalLength = params->ulBodyTotalLen;
78 return ctx;
79 }
81 sftk_MACConstantTimeCtx *
82 sftk_HMACConstantTime_New(CK_MECHANISM_PTR mech, SFTKObject *key)
83 {
84 CK_NSS_MAC_CONSTANT_TIME_PARAMS *params =
85 (CK_NSS_MAC_CONSTANT_TIME_PARAMS *) mech->pParameter;
86 sftk_MACConstantTimeCtx *ctx;
88 if (params->ulHeaderLen > sizeof(ctx->header)) {
89 return NULL;
90 }
91 ctx = SetupMAC(mech, key);
92 if (!ctx) {
93 return NULL;
94 }
96 ctx->headerLength = params->ulHeaderLen;
97 memcpy(ctx->header, params->pHeader, params->ulHeaderLen);
98 return ctx;
99 }
101 sftk_MACConstantTimeCtx *
102 sftk_SSLv3MACConstantTime_New(CK_MECHANISM_PTR mech, SFTKObject *key)
103 {
104 CK_NSS_MAC_CONSTANT_TIME_PARAMS *params =
105 (CK_NSS_MAC_CONSTANT_TIME_PARAMS *) mech->pParameter;
106 unsigned int padLength = 40, j;
107 sftk_MACConstantTimeCtx *ctx;
109 if (params->macAlg != CKM_SSL3_MD5_MAC &&
110 params->macAlg != CKM_SSL3_SHA1_MAC) {
111 return NULL;
112 }
113 ctx = SetupMAC(mech, key);
114 if (!ctx) {
115 return NULL;
116 }
118 if (params->macAlg == CKM_SSL3_MD5_MAC) {
119 padLength = 48;
120 }
122 ctx->headerLength =
123 ctx->secretLength +
124 padLength +
125 params->ulHeaderLen;
127 if (ctx->headerLength > sizeof(ctx->header)) {
128 goto loser;
129 }
131 j = 0;
132 memcpy(&ctx->header[j], ctx->secret, ctx->secretLength);
133 j += ctx->secretLength;
134 memset(&ctx->header[j], 0x36, padLength);
135 j += padLength;
136 memcpy(&ctx->header[j], params->pHeader, params->ulHeaderLen);
138 return ctx;
140 loser:
141 PORT_Free(ctx);
142 return NULL;
143 }
145 void
146 sftk_HMACConstantTime_Update(void *pctx, void *data, unsigned int len)
147 {
148 sftk_MACConstantTimeCtx *ctx = (sftk_MACConstantTimeCtx *) pctx;
149 SECStatus rv = HMAC_ConstantTime(
150 ctx->mac, NULL, sizeof(ctx->mac),
151 ctx->hash,
152 ctx->secret, ctx->secretLength,
153 ctx->header, ctx->headerLength,
154 data, len,
155 ctx->totalLength);
156 PORT_Assert(rv == SECSuccess);
157 }
159 void
160 sftk_SSLv3MACConstantTime_Update(void *pctx, void *data, unsigned int len)
161 {
162 sftk_MACConstantTimeCtx *ctx = (sftk_MACConstantTimeCtx *) pctx;
163 SECStatus rv = SSLv3_MAC_ConstantTime(
164 ctx->mac, NULL, sizeof(ctx->mac),
165 ctx->hash,
166 ctx->secret, ctx->secretLength,
167 ctx->header, ctx->headerLength,
168 data, len,
169 ctx->totalLength);
170 PORT_Assert(rv == SECSuccess);
171 }
173 void
174 sftk_MACConstantTime_EndHash(void *pctx, void *out, unsigned int *outLength,
175 unsigned int maxLength)
176 {
177 const sftk_MACConstantTimeCtx *ctx = (sftk_MACConstantTimeCtx *) pctx;
178 unsigned int toCopy = ctx->hash->length;
179 if (toCopy > maxLength) {
180 toCopy = maxLength;
181 }
182 memcpy(out, ctx->mac, toCopy);
183 if (outLength) {
184 *outLength = toCopy;
185 }
186 }
188 void
189 sftk_MACConstantTime_DestroyContext(void *pctx, PRBool free)
190 {
191 PORT_Free(pctx);
192 }
