Add ECDSA to providers

Added ECDSA support for OSSL_SIGNATURE_PARAM_ALGORITHM_ID

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10968)

7 files changed, 528 insertions, 7 deletions

diff --git a/providers/defltprov.c b/providers/defltprov.c
index 7bb23e3..f893633 100644
--- a/providers/defltprov.c
+++ b/providers/defltprov.c
@@ -373,7 +373,7 @@ static const OSSL_ALGORITHM deflt_keyexch[] = {
     { "DH:dhKeyAgreement", "provider=default", dh_keyexch_functions },
 #endif
 #ifndef OPENSSL_NO_EC
-    { "ECDH:id-ecPublicKey", "provider=default", ecdh_keyexch_functions },
+    { "ECDH", "provider=default", ecdh_keyexch_functions },
     { "X25519", "provider=default", x25519_keyexch_functions },
     { "X448", "provider=default", x448_keyexch_functions },
 #endif
@@ -388,6 +388,7 @@ static const OSSL_ALGORITHM deflt_signature[] = {
 #ifndef OPENSSL_NO_EC
     { "ED25519:Ed25519", "provider=default", ed25519_signature_functions },
     { "ED448:Ed448", "provider=default", ed448_signature_functions },
+    { "ECDSA", "provider=default", ecdsa_signature_functions },
 #endif
     { NULL, NULL, NULL }
 };
diff --git a/providers/fips/fipsprov.c b/providers/fips/fipsprov.c
index 61573f0..b5bf5aa 100644
--- a/providers/fips/fipsprov.c
+++ b/providers/fips/fipsprov.c
@@ -797,7 +797,7 @@ static const OSSL_ALGORITHM fips_keyexch[] = {
     { "DH:dhKeyAgreement", "provider=fips,fips=yes", dh_keyexch_functions },
 #endif
 #ifndef OPENSSL_NO_EC
-    { "ECDH:id-ecPublicKey", "provider=fips,fips=yes", ecdh_keyexch_functions },
+    { "ECDH", "provider=fips,fips=yes", ecdh_keyexch_functions },
 #endif
     { NULL, NULL, NULL }
 };
@@ -807,6 +807,9 @@ static const OSSL_ALGORITHM fips_signature[] = {
     { "DSA:dsaEncryption", "provider=fips,fips=yes", dsa_signature_functions },
 #endif
     { "RSA:rsaEncryption", "provider=fips,fips=yes", rsa_signature_functions },
+#ifndef OPENSSL_NO_EC
+    { "ECDSA", "provider=fips,fips=yes", ecdsa_signature_functions },
+#endif
     { NULL, NULL, NULL }
 };
 
diff --git a/providers/implementations/include/prov/implementations.h b/providers/implementations/include/prov/implementations.h
index 94265ad..57a3122 100644
--- a/providers/implementations/include/prov/implementations.h
+++ b/providers/implementations/include/prov/implementations.h
@@ -274,6 +274,8 @@ extern const OSSL_DISPATCH dsa_signature_functions[];
 extern const OSSL_DISPATCH rsa_signature_functions[];
 extern const OSSL_DISPATCH ed25519_signature_functions[];
 extern const OSSL_DISPATCH ed448_signature_functions[];
+extern const OSSL_DISPATCH ecdsa_signature_functions[];
+
 
 /* Asym Cipher */
 extern const OSSL_DISPATCH rsa_asym_cipher_functions[];
diff --git a/providers/implementations/keymgmt/ec_kmgmt.c b/providers/implementations/keymgmt/ec_kmgmt.c
index 43ccb5d..4787255 100644
--- a/providers/implementations/keymgmt/ec_kmgmt.c
+++ b/providers/implementations/keymgmt/ec_kmgmt.c
@@ -49,10 +49,8 @@ const char *ec_query_operation_name(int operation_id)
     switch (operation_id) {
     case OSSL_OP_KEYEXCH:
         return "ECDH";
-#if 0
     case OSSL_OP_SIGNATURE:
-        return deflt_signature;
-#endif
+        return "ECDSA";
     }
     return NULL;
 }
@@ -135,7 +133,8 @@ int domparams_to_params(const EC_KEY *ec, OSSL_PARAM_BLD *tmpl)
         if ((curve_name = ec_curve_nid2name(curve_nid)) == NULL)
             return 0;
 
-        if (!ossl_param_bld_push_utf8_string(tmpl, OSSL_PKEY_PARAM_EC_NAME, curve_name, 0))
+        if (!ossl_param_bld_push_utf8_string(tmpl, OSSL_PKEY_PARAM_EC_NAME,
+                                             curve_name, 0))
             return 0;
     }
 
diff --git a/providers/implementations/signature/build.info b/providers/implementations/signature/build.info
index bb229be..6f19ca8 100644
--- a/providers/implementations/signature/build.info
+++ b/providers/implementations/signature/build.info
@@ -3,6 +3,7 @@
 
 $DSA_GOAL=../../libimplementations.a
 $EC_GOAL=../../libimplementations.a
+$ECDSA_GOAL=../../libimplementations.a
 
 IF[{- !$disabled{dsa} -}]
   SOURCE[$DSA_GOAL]=dsa.c
@@ -10,6 +11,7 @@ ENDIF
 
 IF[{- !$disabled{ec} -}]
   SOURCE[$EC_GOAL]=eddsa.c
+  SOURCE[$ECDSA_GOAL]=ecdsa.c
 ENDIF
 
 SOURCE[../../libfips.a]=rsa.c
diff --git a/providers/implementations/signature/dsa.c b/providers/implementations/signature/dsa.c
index 99183e8..92c3b57 100644
--- a/providers/implementations/signature/dsa.c
+++ b/providers/implementations/signature/dsa.c
@@ -73,7 +73,7 @@ typedef struct {
 
     char mdname[OSSL_MAX_NAME_SIZE];
 
-    /* The Algorithm Identifier of the combined signature agorithm */
+    /* The Algorithm Identifier of the combined signature algorithm */
     unsigned char aid[OSSL_MAX_ALGORITHM_ID_SIZE];
     size_t  aid_len;
 
diff --git a/providers/implementations/signature/ecdsa.c b/providers/implementations/signature/ecdsa.c
new file mode 100644
index 0000000..733c0a2
--- /dev/null
+++ b/providers/implementations/signature/ecdsa.c
@@ -0,0 +1,514 @@
+/*
+ * Copyright 2020 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
+ */
+
+/*
+ * ECDSA low level APIs are deprecated for public use, but still ok for
+ * internal use.
+ */
+#include "internal/deprecated.h"
+
+#include <string.h> /* memcpy */
+#include <openssl/crypto.h>
+#include <openssl/core_numbers.h>
+#include <openssl/core_names.h>
+#include <openssl/dsa.h>
+#include <openssl/params.h>
+#include <openssl/evp.h>
+#include <openssl/err.h>
+#include "internal/nelem.h"
+#include "internal/sizes.h"
+#include "prov/providercommonerr.h"
+#include "prov/implementations.h"
+#include "prov/provider_ctx.h"
+#include "crypto/ec.h"
+
+static OSSL_OP_signature_newctx_fn ecdsa_newctx;
+static OSSL_OP_signature_sign_init_fn ecdsa_signature_init;
+static OSSL_OP_signature_verify_init_fn ecdsa_signature_init;
+static OSSL_OP_signature_sign_fn ecdsa_sign;
+static OSSL_OP_signature_verify_fn ecdsa_verify;
+static OSSL_OP_signature_digest_sign_init_fn ecdsa_digest_signverify_init;
+static OSSL_OP_signature_digest_sign_update_fn ecdsa_digest_signverify_update;
+static OSSL_OP_signature_digest_sign_final_fn ecdsa_digest_sign_final;
+static OSSL_OP_signature_digest_verify_init_fn ecdsa_digest_signverify_init;
+static OSSL_OP_signature_digest_verify_update_fn ecdsa_digest_signverify_update;
+static OSSL_OP_signature_digest_verify_final_fn ecdsa_digest_verify_final;
+static OSSL_OP_signature_freectx_fn ecdsa_freectx;
+static OSSL_OP_signature_dupctx_fn ecdsa_dupctx;
+static OSSL_OP_signature_get_ctx_params_fn ecdsa_get_ctx_params;
+static OSSL_OP_signature_gettable_ctx_params_fn ecdsa_gettable_ctx_params;
+static OSSL_OP_signature_set_ctx_params_fn ecdsa_set_ctx_params;
+static OSSL_OP_signature_settable_ctx_params_fn ecdsa_settable_ctx_params;
+static OSSL_OP_signature_get_ctx_md_params_fn ecdsa_get_ctx_md_params;
+static OSSL_OP_signature_gettable_ctx_md_params_fn ecdsa_gettable_ctx_md_params;
+static OSSL_OP_signature_set_ctx_md_params_fn ecdsa_set_ctx_md_params;
+static OSSL_OP_signature_settable_ctx_md_params_fn ecdsa_settable_ctx_md_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 {
+    OPENSSL_CTX *libctx;
+    EC_KEY *ec;
+    char mdname[OSSL_MAX_NAME_SIZE];
+
+    /* The Algorithm Identifier of the combined signature algorithm */
+    unsigned char aid[OSSL_MAX_ALGORITHM_ID_SIZE];
+    size_t  aid_len;
+    size_t mdsize;
+
+    EVP_MD *md;
+    EVP_MD_CTX *mdctx;
+    /*
+     * This indicates that KAT (CAVS) test is running. Externally an app will
+     * override the random callback such that the generated private key and k
+     * are known.
+     * Normal operation will loop to choose a new k if the signature is not
+     * valid - but for this mode of operation it forces a failure instead.
+     */
+    unsigned int kattest;
+    /*
+     * Internally used to cache the results of calling the EC group
+     * sign_setup() methods which are then passed to the sign operation.
+     * This is used by CAVS failure tests to terminate a loop if the signature
+     * is not valid.
+     * This could of also been done with a simple flag.
+     */
+    BIGNUM *kinv;
+    BIGNUM *r;
+} PROV_ECDSA_CTX;
+
+static void *ecdsa_newctx(void *provctx)
+{
+    PROV_ECDSA_CTX *ctx = OPENSSL_zalloc(sizeof(PROV_ECDSA_CTX));
+
+    if (ctx == NULL)
+        return NULL;
+
+    ctx->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
+    return ctx;
+}
+
+static int ecdsa_signature_init(void *vctx, void *ec)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx == NULL || ec == NULL || !EC_KEY_up_ref(ec))
+        return 0;
+    EC_KEY_free(ctx->ec);
+    ctx->ec = ec;
+    return 1;
+}
+
+static int ecdsa_sign(void *vctx, unsigned char *sig, size_t *siglen,
+                      size_t sigsize, const unsigned char *tbs, size_t tbslen)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    int ret;
+    unsigned int sltmp;
+    size_t ecsize = ECDSA_size(ctx->ec);
+
+    if (sig == NULL) {
+        *siglen = ecsize;
+        return 1;
+    }
+
+    if (ctx->kattest && !ECDSA_sign_setup(ctx->ec, NULL, &ctx->kinv, &ctx->r))
+        return 0;
+
+    if (sigsize < (size_t)ecsize)
+        return 0;
+
+    if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
+        return 0;
+
+    ret = ECDSA_sign_ex(0, tbs, tbslen, sig, &sltmp, ctx->kinv, ctx->r, ctx->ec);
+    if (ret <= 0)
+        return 0;
+
+    *siglen = sltmp;
+    return 1;
+}
+
+static int ecdsa_verify(void *vctx, const unsigned char *sig, size_t siglen,
+                        const unsigned char *tbs, size_t tbslen)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx->mdsize != 0 && tbslen != ctx->mdsize)
+        return 0;
+
+    return ECDSA_verify(0, tbs, tbslen, sig, siglen, ctx->ec);
+}
+
+static int get_md_nid(const EVP_MD *md)
+{
+    /*
+     * Because the ECDSA library deals with NIDs, we need to translate.
+     * We do so using EVP_MD_is_a(), and therefore need a name to NID
+     * map.
+     */
+    static const OSSL_ITEM name_to_nid[] = {
+        { NID_sha1,   OSSL_DIGEST_NAME_SHA1   },
+        { NID_sha224, OSSL_DIGEST_NAME_SHA2_224 },
+        { NID_sha256, OSSL_DIGEST_NAME_SHA2_256 },
+        { NID_sha384, OSSL_DIGEST_NAME_SHA2_384 },
+        { NID_sha512, OSSL_DIGEST_NAME_SHA2_512 },
+        { NID_sha3_224, OSSL_DIGEST_NAME_SHA3_224 },
+        { NID_sha3_256, OSSL_DIGEST_NAME_SHA3_256 },
+        { NID_sha3_384, OSSL_DIGEST_NAME_SHA3_384 },
+        { NID_sha3_512, OSSL_DIGEST_NAME_SHA3_512 },
+        /* TODO - Add SHAKE OIDS when they are standardized */
+
+    };
+    size_t i;
+    int mdnid = NID_undef;
+
+    if (md == NULL)
+        goto end;
+
+    for (i = 0; i < OSSL_NELEM(name_to_nid); i++) {
+        if (EVP_MD_is_a(md, name_to_nid[i].ptr)) {
+            mdnid = (int)name_to_nid[i].id;
+            break;
+        }
+    }
+
+    if (mdnid == NID_undef)
+        ERR_raise(ERR_LIB_PROV, PROV_R_INVALID_DIGEST);
+
+ end:
+    return mdnid;
+}
+
+static void free_md(PROV_ECDSA_CTX *ctx)
+{
+    EVP_MD_CTX_free(ctx->mdctx);
+    EVP_MD_free(ctx->md);
+    ctx->mdctx = NULL;
+    ctx->md = NULL;
+    ctx->mdsize = 0;
+}
+
+static int ecdsa_digest_signverify_init(void *vctx, const char *mdname,
+                                        const char *props, void *ec)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    size_t algorithmidentifier_len = 0;
+    const unsigned char *algorithmidentifier;
+
+    free_md(ctx);
+
+    if (!ecdsa_signature_init(vctx, ec))
+        return 0;
+
+    ctx->md = EVP_MD_fetch(ctx->libctx, mdname, props);
+    algorithmidentifier =
+        ecdsa_algorithmidentifier_encoding(get_md_nid(ctx->md),
+                                           &algorithmidentifier_len);
+    if (algorithmidentifier == NULL)
+        goto error;
+
+    ctx->mdsize = EVP_MD_size(ctx->md);
+    ctx->mdctx = EVP_MD_CTX_new();
+    if (ctx->mdctx == NULL)
+        goto error;
+
+    memcpy(ctx->aid, algorithmidentifier, algorithmidentifier_len);
+    ctx->aid_len = algorithmidentifier_len;
+
+    if (!EVP_DigestInit_ex(ctx->mdctx, ctx->md, NULL))
+        goto error;
+    return 1;
+error:
+    free_md(ctx);
+    return 0;
+}
+
+int ecdsa_digest_signverify_update(void *vctx, const unsigned char *data,
+                                   size_t datalen)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx == NULL || ctx->mdctx == NULL)
+        return 0;
+
+    return EVP_DigestUpdate(ctx->mdctx, data, datalen);
+}
+
+int ecdsa_digest_sign_final(void *vctx, unsigned char *sig, size_t *siglen,
+                            size_t sigsize)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    unsigned char digest[EVP_MAX_MD_SIZE];
+    unsigned int dlen = 0;
+
+    if (ctx == NULL || ctx->mdctx == NULL)
+        return 0;
+
+    /*
+     * If sig is NULL then we're just finding out the sig size. Other fields
+     * are ignored. Defer to ecdsa_sign.
+     */
+    if (sig != NULL) {
+        /*
+         * TODO(3.0): There is the possibility that some externally provided
+         * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
+         * but that problem is much larger than just in DSA.
+         */
+        if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
+            return 0;
+    }
+
+    return ecdsa_sign(vctx, sig, siglen, sigsize, digest, (size_t)dlen);
+}
+
+int ecdsa_digest_verify_final(void *vctx, const unsigned char *sig,
+                              size_t siglen)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    unsigned char digest[EVP_MAX_MD_SIZE];
+    unsigned int dlen = 0;
+
+    if (ctx == NULL || ctx->mdctx == NULL)
+        return 0;
+
+    /*
+     * TODO(3.0): There is the possibility that some externally provided
+     * digests exceed EVP_MAX_MD_SIZE. We should probably handle that somehow -
+     * but that problem is much larger than just in DSA.
+     */
+    if (!EVP_DigestFinal_ex(ctx->mdctx, digest, &dlen))
+        return 0;
+
+    return ecdsa_verify(ctx, sig, siglen, digest, (size_t)dlen);
+}
+
+static void ecdsa_freectx(void *vctx)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    free_md(ctx);
+    EC_KEY_free(ctx->ec);
+    BN_clear_free(ctx->kinv);
+    BN_clear_free(ctx->r);
+    OPENSSL_free(ctx);
+}
+
+static void *ecdsa_dupctx(void *vctx)
+{
+    PROV_ECDSA_CTX *srcctx = (PROV_ECDSA_CTX *)vctx;
+    PROV_ECDSA_CTX *dstctx;
+
+    dstctx = OPENSSL_zalloc(sizeof(*srcctx));
+    if (dstctx == NULL)
+        return NULL;
+
+    *dstctx = *srcctx;
+    dstctx->ec = NULL;
+    dstctx->md = NULL;
+    dstctx->mdctx = NULL;
+
+    if (srcctx->ec != NULL && !EC_KEY_up_ref(srcctx->ec))
+        goto err;
+    /* Test KATS should not need to be supported */
+    if (srcctx->kinv != NULL || srcctx->r != NULL)
+        goto err;
+    dstctx->ec = srcctx->ec;
+
+    if (srcctx->md != NULL && !EVP_MD_up_ref(srcctx->md))
+        goto err;
+    dstctx->md = srcctx->md;
+
+    if (srcctx->mdctx != NULL) {
+        dstctx->mdctx = EVP_MD_CTX_new();
+        if (dstctx->mdctx == NULL
+                || !EVP_MD_CTX_copy_ex(dstctx->mdctx, srcctx->mdctx))
+            goto err;
+    }
+
+    return dstctx;
+ err:
+    ecdsa_freectx(dstctx);
+    return NULL;
+}
+
+static int ecdsa_get_ctx_params(void *vctx, OSSL_PARAM *params)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    OSSL_PARAM *p;
+
+    if (ctx == NULL || params == NULL)
+        return 0;
+
+    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_ALGORITHM_ID);
+    if (p != NULL && !OSSL_PARAM_set_octet_string(p, ctx->aid, ctx->aid_len))
+        return 0;
+
+    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
+    if (p != NULL && !OSSL_PARAM_set_size_t(p, ctx->mdsize))
+        return 0;
+
+    p = OSSL_PARAM_locate(params, OSSL_SIGNATURE_PARAM_DIGEST);
+    if (p != NULL && !OSSL_PARAM_set_utf8_string(p, ctx->md == NULL
+                                                    ? ctx->mdname
+                                                    : EVP_MD_name(ctx->md)))
+        return 0;
+
+    return 1;
+}
+
+static const OSSL_PARAM known_gettable_ctx_params[] = {
+    OSSL_PARAM_octet_string(OSSL_SIGNATURE_PARAM_ALGORITHM_ID, NULL, 0),
+    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
+    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
+    OSSL_PARAM_END
+};
+
+static const OSSL_PARAM *ecdsa_gettable_ctx_params(void)
+{
+    return known_gettable_ctx_params;
+}
+
+static int ecdsa_set_ctx_params(void *vctx, const OSSL_PARAM params[])
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+    const OSSL_PARAM *p;
+    char *mdname;
+
+    if (ctx == NULL || params == NULL)
+        return 0;
+
+    if (ctx->md != NULL) {
+        /*
+         * You cannot set the digest name/size when doing a DigestSign or
+         * DigestVerify.
+         */
+        return 1;
+    }
+
+    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_KAT);
+    if (p != NULL && !OSSL_PARAM_get_uint(p, &ctx->kattest))
+        return 0;
+
+    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST_SIZE);
+    if (p != NULL && !OSSL_PARAM_get_size_t(p, &ctx->mdsize))
+        return 0;
+
+    /*
+     * We never actually use the mdname, but we do support getting it later.
+     * This can be useful for applications that want to know the MD that they
+     * previously set.
+     */
+    p = OSSL_PARAM_locate_const(params, OSSL_SIGNATURE_PARAM_DIGEST);
+    mdname = ctx->mdname;
+    if (p != NULL
+            && !OSSL_PARAM_get_utf8_string(p, &mdname, sizeof(ctx->mdname)))
+        return 0;
+
+    return 1;
+}
+
+static const OSSL_PARAM known_settable_ctx_params[] = {
+    OSSL_PARAM_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE, NULL),
+    OSSL_PARAM_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST, NULL, 0),
+    OSSL_PARAM_uint(OSSL_SIGNATURE_PARAM_KAT, NULL),
+    OSSL_PARAM_END
+};
+
+static const OSSL_PARAM *ecdsa_settable_ctx_params(void)
+{
+    /*
+     * TODO(3.0): Should this function return a different set of settable ctx
+     * params if the ctx is being used for a DigestSign/DigestVerify? In that
+     * case it is not allowed to set the digest size/digest name because the
+     * digest is explicitly set as part of the init.
+     */
+    return known_settable_ctx_params;
+}
+
+static int ecdsa_get_ctx_md_params(void *vctx, OSSL_PARAM *params)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx->mdctx == NULL)
+        return 0;
+
+    return EVP_MD_CTX_get_params(ctx->mdctx, params);
+}
+
+static const OSSL_PARAM *ecdsa_gettable_ctx_md_params(void *vctx)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx->md == NULL)
+        return 0;
+
+    return EVP_MD_gettable_ctx_params(ctx->md);
+}
+
+static int ecdsa_set_ctx_md_params(void *vctx, const OSSL_PARAM params[])
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx->mdctx == NULL)
+        return 0;
+
+    return EVP_MD_CTX_set_params(ctx->mdctx, params);
+}
+
+static const OSSL_PARAM *ecdsa_settable_ctx_md_params(void *vctx)
+{
+    PROV_ECDSA_CTX *ctx = (PROV_ECDSA_CTX *)vctx;
+
+    if (ctx->md == NULL)
+        return 0;
+
+    return EVP_MD_settable_ctx_params(ctx->md);
+}
+
+const OSSL_DISPATCH ecdsa_signature_functions[] = {
+    { OSSL_FUNC_SIGNATURE_NEWCTX, (void (*)(void))ecdsa_newctx },
+    { OSSL_FUNC_SIGNATURE_SIGN_INIT, (void (*)(void))ecdsa_signature_init },
+    { OSSL_FUNC_SIGNATURE_SIGN, (void (*)(void))ecdsa_sign },
+    { OSSL_FUNC_SIGNATURE_VERIFY_INIT, (void (*)(void))ecdsa_signature_init },
+    { OSSL_FUNC_SIGNATURE_VERIFY, (void (*)(void))ecdsa_verify },
+    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_INIT,
+      (void (*)(void))ecdsa_digest_signverify_init },
+    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_UPDATE,
+      (void (*)(void))ecdsa_digest_signverify_update },
+    { OSSL_FUNC_SIGNATURE_DIGEST_SIGN_FINAL,
+      (void (*)(void))ecdsa_digest_sign_final },
+    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_INIT,
+      (void (*)(void))ecdsa_digest_signverify_init },
+    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_UPDATE,
+      (void (*)(void))ecdsa_digest_signverify_update },
+    { OSSL_FUNC_SIGNATURE_DIGEST_VERIFY_FINAL,
+      (void (*)(void))ecdsa_digest_verify_final },
+    { OSSL_FUNC_SIGNATURE_FREECTX, (void (*)(void))ecdsa_freectx },
+    { OSSL_FUNC_SIGNATURE_DUPCTX, (void (*)(void))ecdsa_dupctx },
+    { OSSL_FUNC_SIGNATURE_GET_CTX_PARAMS, (void (*)(void))ecdsa_get_ctx_params },
+    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_PARAMS,
+      (void (*)(void))ecdsa_gettable_ctx_params },
+    { OSSL_FUNC_SIGNATURE_SET_CTX_PARAMS, (void (*)(void))ecdsa_set_ctx_params },
+    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_PARAMS,
+      (void (*)(void))ecdsa_settable_ctx_params },
+    { OSSL_FUNC_SIGNATURE_GET_CTX_MD_PARAMS,
+      (void (*)(void))ecdsa_get_ctx_md_params },
+    { OSSL_FUNC_SIGNATURE_GETTABLE_CTX_MD_PARAMS,
+      (void (*)(void))ecdsa_gettable_ctx_md_params },
+    { OSSL_FUNC_SIGNATURE_SET_CTX_MD_PARAMS,
+      (void (*)(void))ecdsa_set_ctx_md_params },
+    { OSSL_FUNC_SIGNATURE_SETTABLE_CTX_MD_PARAMS,
+      (void (*)(void))ecdsa_settable_ctx_md_params },
+    { 0, NULL }
+};