+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <openssl/crypto.h>
+#include <openssl/core_numbers.h>
+#include <openssl/core_names.h>
+#include <openssl/dsa.h>
+#include <openssl/params.h>
+#include "internal/provider_algs.h"
+
+static OSSL_OP_signature_newctx_fn dsa_newctx;
+static OSSL_OP_signature_sign_init_fn dsa_sign_init;
+static OSSL_OP_signature_sign_fn dsa_sign;
+static OSSL_OP_signature_freectx_fn dsa_freectx;
+static OSSL_OP_signature_dupctx_fn dsa_dupctx;
+static OSSL_OP_signature_set_params_fn dsa_set_params;
+
+/*
+ * What's passed as an actual key is defined by the KEYMGMT interface.
+ * We happen to know that our KEYMGMT simply passes DSA structures, so
+ * we use that here too.
+ */
+
+typedef struct {
+ DSA *dsa;
+ size_t mdsize;
+} PROV_DSA_CTX;
+
+static void *dsa_newctx(void *provctx)
+{
+ return OPENSSL_zalloc(sizeof(PROV_DSA_CTX));
+}
+
+static int dsa_sign_init(void *vpdsactx, void *vdsa)
+{
+ PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
+
+ if (pdsactx == NULL || vdsa == NULL || !DSA_up_ref(vdsa))
+ return 0;
+ DSA_free(pdsactx->dsa);
+ pdsactx->dsa = vdsa;
+ return 1;
+}
+
+static int dsa_sign(void *vpdsactx, unsigned char *sig, size_t *siglen,
+ size_t sigsize, const unsigned char *tbs, size_t tbslen)
+{
+ PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
+ int ret;
+ unsigned int sltmp;
+ size_t dsasize = DSA_size(pdsactx->dsa);
+
+ if (sig == NULL) {
+ *siglen = dsasize;
+ return 1;
+ }
+
+ if (sigsize < (size_t)dsasize)
+ return 0;
+
+ if (pdsactx->mdsize != 0 && tbslen != pdsactx->mdsize)
+ return 0;
+
+ ret = DSA_sign(0, tbs, tbslen, sig, &sltmp, pdsactx-> dsa);
+
+ if (ret <= 0)
+ return 0;
+
+ *siglen = sltmp;
+ return 1;
+}
+
+static void dsa_freectx(void *vpdsactx)
+{
+ PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
+
+ DSA_free(pdsactx->dsa);
+
+ OPENSSL_free(pdsactx);
+}
+
+static void *dsa_dupctx(void *vpdsactx)
+{
+ PROV_DSA_CTX *srcctx = (PROV_DSA_CTX *)vpdsactx;
+ PROV_DSA_CTX *dstctx;
+
+ dstctx = OPENSSL_zalloc(sizeof(*srcctx));
+ if (dstctx == NULL)
+ return NULL;
+
+ *dstctx = *srcctx;
+ if (dstctx->dsa != NULL && !DSA_up_ref(dstctx->dsa)) {
+ OPENSSL_free(dstctx);
+ return NULL;
+ }
+
+ return dstctx;
+}
+
+static int dsa_set_params(void *vpdsactx, const OSSL_PARAM params[])
+{
+ PROV_DSA_CTX *pdsactx = (PROV_DSA_CTX *)vpdsactx;
+ const OSSL_PARAM *p;
+ size_t mdsize;
+
+ if (pdsactx == NULL || params == NULL)
+ return 0;
+
+ p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
+ if (p == NULL || !OSSL_PARAM_get_size_t(p, &mdsize))
+ return 0;
+
+ pdsactx->mdsize = mdsize;
+
+ return 1;
+}
+
+const OSSL_DISPATCH dsa_signature_functions[] = {
+ { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))dsa_newctx },
+ { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))dsa_sign_init },
+ { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))dsa_sign },
+ { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))dsa_freectx },
+ { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))dsa_dupctx },
+ { OSSL_FUNC_SIGNATURE_SET_PARAMS, (void (*)(void))dsa_set_params },
+ { 0, NULL }
+};
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