}
certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
- if (ctx->ess_cert_id_digest == EVP_sha1()) {
+ if (ctx->ess_cert_id_digest == NULL
+ || ctx->ess_cert_id_digest == EVP_sha1()) {
if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL)
goto err;