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15#include "qemu/osdep.h"
16#include "qapi/error.h"
17#include "crypto/hmac.h"
18#include "hmacpriv.h"
19#include <nettle/hmac.h>
20
21typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
22 size_t key_length, const uint8_t *key);
23
24typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
25 size_t length, const uint8_t *data);
26
27typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
28 size_t length, uint8_t *digest);
29
30typedef struct QCryptoHmacNettle QCryptoHmacNettle;
31struct QCryptoHmacNettle {
32 union qcrypto_nettle_hmac_ctx {
33 struct hmac_md5_ctx md5_ctx;
34 struct hmac_sha1_ctx sha1_ctx;
35 struct hmac_sha256_ctx sha256_ctx;
36 struct hmac_sha512_ctx sha512_ctx;
37 struct hmac_ripemd160_ctx ripemd160_ctx;
38 } u;
39};
40
41struct qcrypto_nettle_hmac_alg {
42 qcrypto_nettle_hmac_setkey setkey;
43 qcrypto_nettle_hmac_update update;
44 qcrypto_nettle_hmac_digest digest;
45 size_t len;
46} qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
47 [QCRYPTO_HASH_ALG_MD5] = {
48 .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
49 .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
50 .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
51 .len = MD5_DIGEST_SIZE,
52 },
53 [QCRYPTO_HASH_ALG_SHA1] = {
54 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
55 .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
56 .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
57 .len = SHA1_DIGEST_SIZE,
58 },
59 [QCRYPTO_HASH_ALG_SHA224] = {
60 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
61 .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
62 .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
63 .len = SHA224_DIGEST_SIZE,
64 },
65 [QCRYPTO_HASH_ALG_SHA256] = {
66 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
67 .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
68 .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
69 .len = SHA256_DIGEST_SIZE,
70 },
71 [QCRYPTO_HASH_ALG_SHA384] = {
72 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
73 .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
74 .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
75 .len = SHA384_DIGEST_SIZE,
76 },
77 [QCRYPTO_HASH_ALG_SHA512] = {
78 .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
79 .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
80 .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
81 .len = SHA512_DIGEST_SIZE,
82 },
83 [QCRYPTO_HASH_ALG_RIPEMD160] = {
84 .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
85 .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
86 .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
87 .len = RIPEMD160_DIGEST_SIZE,
88 },
89};
90
91bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
92{
93 if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
94 qcrypto_hmac_alg_map[alg].setkey != NULL) {
95 return true;
96 }
97
98 return false;
99}
100
101void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
102 const uint8_t *key, size_t nkey,
103 Error **errp)
104{
105 QCryptoHmacNettle *ctx;
106
107 if (!qcrypto_hmac_supports(alg)) {
108 error_setg(errp, "Unsupported hmac algorithm %s",
109 QCryptoHashAlgorithm_str(alg));
110 return NULL;
111 }
112
113 ctx = g_new0(QCryptoHmacNettle, 1);
114
115 qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
116
117 return ctx;
118}
119
120static void
121qcrypto_nettle_hmac_ctx_free(QCryptoHmac *hmac)
122{
123 QCryptoHmacNettle *ctx;
124
125 ctx = hmac->opaque;
126 g_free(ctx);
127}
128
129static int
130qcrypto_nettle_hmac_bytesv(QCryptoHmac *hmac,
131 const struct iovec *iov,
132 size_t niov,
133 uint8_t **result,
134 size_t *resultlen,
135 Error **errp)
136{
137 QCryptoHmacNettle *ctx;
138 int i;
139
140 ctx = (QCryptoHmacNettle *)hmac->opaque;
141
142 for (i = 0; i < niov; ++i) {
143 size_t len = iov[i].iov_len;
144 uint8_t *base = iov[i].iov_base;
145 while (len) {
146 size_t shortlen = MIN(len, UINT_MAX);
147 qcrypto_hmac_alg_map[hmac->alg].update(&ctx->u, len, base);
148 len -= shortlen;
149 base += len;
150 }
151 }
152
153 if (*resultlen == 0) {
154 *resultlen = qcrypto_hmac_alg_map[hmac->alg].len;
155 *result = g_new0(uint8_t, *resultlen);
156 } else if (*resultlen != qcrypto_hmac_alg_map[hmac->alg].len) {
157 error_setg(errp,
158 "Result buffer size %zu is smaller than hash %zu",
159 *resultlen, qcrypto_hmac_alg_map[hmac->alg].len);
160 return -1;
161 }
162
163 qcrypto_hmac_alg_map[hmac->alg].digest(&ctx->u, *resultlen, *result);
164
165 return 0;
166}
167
168QCryptoHmacDriver qcrypto_hmac_lib_driver = {
169 .hmac_bytesv = qcrypto_nettle_hmac_bytesv,
170 .hmac_free = qcrypto_nettle_hmac_ctx_free,
171};
172
