migration/postcopy: discard_length must not be 0

[mirror_qemu.git] / crypto / hmac-nettle.c

diff --git a/crypto/hmac-nettle.c b/crypto/hmac-nettle.c
index 95f3dcc61c53633afa0b4468cb4298f2f3122bf8..1152b741fdcbadace957d4ecf7df7a93cae9328c 100644 (file)
--- a/crypto/hmac-nettle.c
+++ b/crypto/hmac-nettle.c
@@ -15,31 +15,166 @@
 #include "qemu/osdep.h"
 #include "qapi/error.h"
 #include "crypto/hmac.h"
+#include "hmacpriv.h"
 #include <nettle/hmac.h>
 
+#if CONFIG_NETTLE_VERSION_MAJOR < 3
+typedef unsigned int hmac_length_t;
+#else
+typedef size_t hmac_length_t;
+#endif
+
+typedef void (*qcrypto_nettle_hmac_setkey)(void *ctx,
+                                           hmac_length_t key_length,
+                                           const uint8_t *key);
+
+typedef void (*qcrypto_nettle_hmac_update)(void *ctx,
+                                           hmac_length_t length,
+                                           const uint8_t *data);
+
+typedef void (*qcrypto_nettle_hmac_digest)(void *ctx,
+                                           hmac_length_t length,
+                                           uint8_t *digest);
+
+typedef struct QCryptoHmacNettle QCryptoHmacNettle;
+struct QCryptoHmacNettle {
+    union qcrypto_nettle_hmac_ctx {
+        struct hmac_md5_ctx md5_ctx;
+        struct hmac_sha1_ctx sha1_ctx;
+        struct hmac_sha256_ctx sha256_ctx; /* equals hmac_sha224_ctx */
+        struct hmac_sha512_ctx sha512_ctx; /* equals hmac_sha384_ctx */
+        struct hmac_ripemd160_ctx ripemd160_ctx;
+    } u;
+};
+
+struct qcrypto_nettle_hmac_alg {
+    qcrypto_nettle_hmac_setkey setkey;
+    qcrypto_nettle_hmac_update update;
+    qcrypto_nettle_hmac_digest digest;
+    size_t len;
+} qcrypto_hmac_alg_map[QCRYPTO_HASH_ALG__MAX] = {
+    [QCRYPTO_HASH_ALG_MD5] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_md5_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_md5_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_md5_digest,
+        .len = MD5_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA1] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha1_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_sha1_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_sha1_digest,
+        .len = SHA1_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA224] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha224_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_sha224_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_sha224_digest,
+        .len = SHA224_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA256] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha256_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_sha256_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_sha256_digest,
+        .len = SHA256_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA384] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha384_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_sha384_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_sha384_digest,
+        .len = SHA384_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_SHA512] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_sha512_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_sha512_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_sha512_digest,
+        .len = SHA512_DIGEST_SIZE,
+    },
+    [QCRYPTO_HASH_ALG_RIPEMD160] = {
+        .setkey = (qcrypto_nettle_hmac_setkey)hmac_ripemd160_set_key,
+        .update = (qcrypto_nettle_hmac_update)hmac_ripemd160_update,
+        .digest = (qcrypto_nettle_hmac_digest)hmac_ripemd160_digest,
+        .len = RIPEMD160_DIGEST_SIZE,
+    },
+};
+
 bool qcrypto_hmac_supports(QCryptoHashAlgorithm alg)
 {
+    if (alg < G_N_ELEMENTS(qcrypto_hmac_alg_map) &&
+        qcrypto_hmac_alg_map[alg].setkey != NULL) {
+        return true;
+    }
+
     return false;
 }
 
-QCryptoHmac *qcrypto_hmac_new(QCryptoHashAlgorithm alg,
-                              const uint8_t *key, size_t nkey,
-                              Error **errp)
+void *qcrypto_hmac_ctx_new(QCryptoHashAlgorithm alg,
+                           const uint8_t *key, size_t nkey,
+                           Error **errp)
 {
-    return NULL;
+    QCryptoHmacNettle *ctx;
+
+    if (!qcrypto_hmac_supports(alg)) {
+        error_setg(errp, "Unsupported hmac algorithm %s",
+                   QCryptoHashAlgorithm_str(alg));
+        return NULL;
+    }
+
+    ctx = g_new0(QCryptoHmacNettle, 1);
+
+    qcrypto_hmac_alg_map[alg].setkey(&ctx->u, nkey, key);
+
+    return ctx;
 }
 
-void qcrypto_hmac_free(QCryptoHmac *hmac)
+static void
+qcrypto_nettle_hmac_ctx_free(QCryptoHmac *hmac)
 {
-    return;
+    QCryptoHmacNettle *ctx;
+
+    ctx = hmac->opaque;
+    g_free(ctx);
 }
 
-int qcrypto_hmac_bytesv(QCryptoHmac *hmac,
-                        const struct iovec *iov,
-                        size_t niov,
-                        uint8_t **result,
-                        size_t *resultlen,
-                        Error **errp)
+static int
+qcrypto_nettle_hmac_bytesv(QCryptoHmac *hmac,
+                           const struct iovec *iov,
+                           size_t niov,
+                           uint8_t **result,
+                           size_t *resultlen,
+                           Error **errp)
 {
-    return -1;
+    QCryptoHmacNettle *ctx;
+    size_t i;
+
+    ctx = (QCryptoHmacNettle *)hmac->opaque;
+
+    for (i = 0; i < niov; ++i) {
+        size_t len = iov[i].iov_len;
+        uint8_t *base = iov[i].iov_base;
+        while (len) {
+            size_t shortlen = MIN(len, UINT_MAX);
+            qcrypto_hmac_alg_map[hmac->alg].update(&ctx->u, len, base);
+            len -= shortlen;
+            base += len;
+        }
+    }
+
+    if (*resultlen == 0) {
+        *resultlen = qcrypto_hmac_alg_map[hmac->alg].len;
+        *result = g_new0(uint8_t, *resultlen);
+    } else if (*resultlen != qcrypto_hmac_alg_map[hmac->alg].len) {
+        error_setg(errp,
+                   "Result buffer size %zu is smaller than hash %zu",
+                   *resultlen, qcrypto_hmac_alg_map[hmac->alg].len);
+        return -1;
+    }
+
+    qcrypto_hmac_alg_map[hmac->alg].digest(&ctx->u, *resultlen, *result);
+
+    return 0;
 }
+
+QCryptoHmacDriver qcrypto_hmac_lib_driver = {
+    .hmac_bytesv = qcrypto_nettle_hmac_bytesv,
+    .hmac_free = qcrypto_nettle_hmac_ctx_free,
+};