+int EVP_PKEY_CTX_get_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD **md)
+{
+ OSSL_PARAM sig_md_params[3], *p = sig_md_params;
+ /* 80 should be big enough */
+ char name[80] = "";
+ const EVP_MD *tmp;
+
+ if (ctx == NULL || !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
+ ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
+ /* Uses the same return values as EVP_PKEY_CTX_ctrl */
+ return -2;
+ }
+
+ /* TODO(3.0): Remove this eventually when no more legacy */
+ if (ctx->op.sig.sigprovctx == NULL)
+ return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG,
+ EVP_PKEY_CTRL_GET_MD, 0, (void *)(md));
+
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST,
+ name,
+ sizeof(name));
+ *p++ = OSSL_PARAM_construct_end();
+
+ if (!EVP_PKEY_CTX_get_params(ctx, sig_md_params))
+ return 0;
+
+ tmp = EVP_get_digestbyname(name);
+ if (tmp == NULL)
+ return 0;
+
+ *md = tmp;
+
+ return 1;
+}
+
+int EVP_PKEY_CTX_set_signature_md(EVP_PKEY_CTX *ctx, const EVP_MD *md)
+{
+ OSSL_PARAM sig_md_params[3], *p = sig_md_params;
+ size_t mdsize;
+ const char *name;
+
+ if (ctx == NULL || !EVP_PKEY_CTX_IS_SIGNATURE_OP(ctx)) {
+ ERR_raise(ERR_LIB_EVP, EVP_R_COMMAND_NOT_SUPPORTED);
+ /* Uses the same return values as EVP_PKEY_CTX_ctrl */
+ return -2;
+ }
+
+ /* TODO(3.0): Remove this eventually when no more legacy */
+ if (ctx->op.sig.sigprovctx == NULL)
+ return EVP_PKEY_CTX_ctrl(ctx, -1, EVP_PKEY_OP_TYPE_SIG,
+ EVP_PKEY_CTRL_MD, 0, (void *)(md));
+
+ if (md == NULL) {
+ name = "";
+ mdsize = 0;
+ } else {
+ mdsize = EVP_MD_size(md);
+ name = EVP_MD_name(md);
+ }
+
+ *p++ = OSSL_PARAM_construct_utf8_string(OSSL_SIGNATURE_PARAM_DIGEST,
+ /*
+ * Cast away the const. This is read
+ * only so should be safe
+ */
+ (char *)name,
+ strlen(name) + 1);
+ *p++ = OSSL_PARAM_construct_size_t(OSSL_SIGNATURE_PARAM_DIGEST_SIZE,
+ &mdsize);
+ *p++ = OSSL_PARAM_construct_end();
+
+ return EVP_PKEY_CTX_set_params(ctx, sig_md_params);
+}
+