xref: /openbmc/qemu/crypto/hash-afalg.c (revision 0f9668e0)
1 /*
2  * QEMU Crypto af_alg-backend hash/hmac support
3  *
4  * Copyright (c) 2017 HUAWEI TECHNOLOGIES CO., LTD.
5  *
6  * Authors:
7  *    Longpeng(Mike) <longpeng2@huawei.com>
8  *
9  * This work is licensed under the terms of the GNU GPL, version 2 or
10  * (at your option) any later version.  See the COPYING file in the
11  * top-level directory.
12  */
13 #include "qemu/osdep.h"
14 #include "qemu/iov.h"
15 #include "qemu/sockets.h"
16 #include "qapi/error.h"
17 #include "crypto/hash.h"
18 #include "crypto/hmac.h"
19 #include "hashpriv.h"
20 #include "hmacpriv.h"
21 
22 static char *
qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,bool is_hmac,Error ** errp)23 qcrypto_afalg_hash_format_name(QCryptoHashAlgorithm alg,
24                                bool is_hmac,
25                                Error **errp)
26 {
27     char *name;
28     const char *alg_name;
29 
30     switch (alg) {
31     case QCRYPTO_HASH_ALG_MD5:
32         alg_name = "md5";
33         break;
34     case QCRYPTO_HASH_ALG_SHA1:
35         alg_name = "sha1";
36         break;
37     case QCRYPTO_HASH_ALG_SHA224:
38         alg_name = "sha224";
39         break;
40     case QCRYPTO_HASH_ALG_SHA256:
41         alg_name = "sha256";
42         break;
43     case QCRYPTO_HASH_ALG_SHA384:
44         alg_name = "sha384";
45         break;
46     case QCRYPTO_HASH_ALG_SHA512:
47         alg_name = "sha512";
48         break;
49     case QCRYPTO_HASH_ALG_RIPEMD160:
50         alg_name = "rmd160";
51         break;
52 
53     default:
54         error_setg(errp, "Unsupported hash algorithm %d", alg);
55         return NULL;
56     }
57 
58     if (is_hmac) {
59         name = g_strdup_printf("hmac(%s)", alg_name);
60     } else {
61         name = g_strdup_printf("%s", alg_name);
62     }
63 
64     return name;
65 }
66 
67 static QCryptoAFAlg *
qcrypto_afalg_hash_hmac_ctx_new(QCryptoHashAlgorithm alg,const uint8_t * key,size_t nkey,bool is_hmac,Error ** errp)68 qcrypto_afalg_hash_hmac_ctx_new(QCryptoHashAlgorithm alg,
69                                 const uint8_t *key, size_t nkey,
70                                 bool is_hmac, Error **errp)
71 {
72     QCryptoAFAlg *afalg;
73     char *name;
74 
75     name = qcrypto_afalg_hash_format_name(alg, is_hmac, errp);
76     if (!name) {
77         return NULL;
78     }
79 
80     afalg = qcrypto_afalg_comm_alloc(AFALG_TYPE_HASH, name, errp);
81     if (!afalg) {
82         g_free(name);
83         return NULL;
84     }
85 
86     g_free(name);
87 
88     /* HMAC needs setkey */
89     if (is_hmac) {
90         if (setsockopt(afalg->tfmfd, SOL_ALG, ALG_SET_KEY,
91                        key, nkey) != 0) {
92             error_setg_errno(errp, errno, "Set hmac key failed");
93             qcrypto_afalg_comm_free(afalg);
94             return NULL;
95         }
96     }
97 
98     return afalg;
99 }
100 
101 static QCryptoAFAlg *
qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg,Error ** errp)102 qcrypto_afalg_hash_ctx_new(QCryptoHashAlgorithm alg,
103                            Error **errp)
104 {
105     return qcrypto_afalg_hash_hmac_ctx_new(alg, NULL, 0, false, errp);
106 }
107 
108 QCryptoAFAlg *
qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgorithm alg,const uint8_t * key,size_t nkey,Error ** errp)109 qcrypto_afalg_hmac_ctx_new(QCryptoHashAlgorithm alg,
110                            const uint8_t *key, size_t nkey,
111                            Error **errp)
112 {
113     return qcrypto_afalg_hash_hmac_ctx_new(alg, key, nkey, true, errp);
114 }
115 
116 static int
qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlg * hmac,QCryptoHashAlgorithm alg,const struct iovec * iov,size_t niov,uint8_t ** result,size_t * resultlen,Error ** errp)117 qcrypto_afalg_hash_hmac_bytesv(QCryptoAFAlg *hmac,
118                                QCryptoHashAlgorithm alg,
119                                const struct iovec *iov,
120                                size_t niov, uint8_t **result,
121                                size_t *resultlen,
122                                Error **errp)
123 {
124     QCryptoAFAlg *afalg;
125     struct iovec outv;
126     int ret = 0;
127     bool is_hmac = (hmac != NULL) ? true : false;
128     const int expect_len = qcrypto_hash_digest_len(alg);
129 
130     if (*resultlen == 0) {
131         *resultlen = expect_len;
132         *result = g_new0(uint8_t, *resultlen);
133     } else if (*resultlen != expect_len) {
134         error_setg(errp,
135                    "Result buffer size %zu is not match hash %d",
136                    *resultlen, expect_len);
137         return -1;
138     }
139 
140     if (is_hmac) {
141         afalg = hmac;
142     } else {
143         afalg = qcrypto_afalg_hash_ctx_new(alg, errp);
144         if (!afalg) {
145             return -1;
146         }
147     }
148 
149     /* send data to kernel's crypto core */
150     ret = iov_send_recv(afalg->opfd, iov, niov,
151                         0, iov_size(iov, niov), true);
152     if (ret < 0) {
153         error_setg_errno(errp, errno, "Send data to afalg-core failed");
154         goto out;
155     }
156 
157     /* hash && get result */
158     outv.iov_base = *result;
159     outv.iov_len = *resultlen;
160     ret = iov_send_recv(afalg->opfd, &outv, 1,
161                         0, iov_size(&outv, 1), false);
162     if (ret < 0) {
163         error_setg_errno(errp, errno, "Recv result from afalg-core failed");
164     } else {
165         ret = 0;
166     }
167 
168 out:
169     if (!is_hmac) {
170         qcrypto_afalg_comm_free(afalg);
171     }
172     return ret;
173 }
174 
175 static int
qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,const struct iovec * iov,size_t niov,uint8_t ** result,size_t * resultlen,Error ** errp)176 qcrypto_afalg_hash_bytesv(QCryptoHashAlgorithm alg,
177                           const struct iovec *iov,
178                           size_t niov, uint8_t **result,
179                           size_t *resultlen,
180                           Error **errp)
181 {
182     return qcrypto_afalg_hash_hmac_bytesv(NULL, alg, iov, niov, result,
183                                           resultlen, errp);
184 }
185 
186 static int
qcrypto_afalg_hmac_bytesv(QCryptoHmac * hmac,const struct iovec * iov,size_t niov,uint8_t ** result,size_t * resultlen,Error ** errp)187 qcrypto_afalg_hmac_bytesv(QCryptoHmac *hmac,
188                           const struct iovec *iov,
189                           size_t niov, uint8_t **result,
190                           size_t *resultlen,
191                           Error **errp)
192 {
193     return qcrypto_afalg_hash_hmac_bytesv(hmac->opaque, hmac->alg,
194                                           iov, niov, result, resultlen,
195                                           errp);
196 }
197 
qcrypto_afalg_hmac_ctx_free(QCryptoHmac * hmac)198 static void qcrypto_afalg_hmac_ctx_free(QCryptoHmac *hmac)
199 {
200     QCryptoAFAlg *afalg;
201 
202     afalg = hmac->opaque;
203     qcrypto_afalg_comm_free(afalg);
204 }
205 
206 QCryptoHashDriver qcrypto_hash_afalg_driver = {
207     .hash_bytesv = qcrypto_afalg_hash_bytesv,
208 };
209 
210 QCryptoHmacDriver qcrypto_hmac_afalg_driver = {
211     .hmac_bytesv = qcrypto_afalg_hmac_bytesv,
212     .hmac_free = qcrypto_afalg_hmac_ctx_free,
213 };
214