ecx_sig_size
*out_sig_len = ecx_sig_size(pkey_ctx->pkey);
if (*out_sig_len < ecx_sig_size(pkey_ctx->pkey)) {
*out_sig_len = ecx_sig_size(pkey_ctx->pkey);
if (sig_len != ecx_sig_size(pkey_ctx->pkey))
.pkey_size = ecx_sig_size,