diff options
| -rw-r--r-- | util/jwt.lua | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/util/jwt.lua b/util/jwt.lua index 0c878efb..42a9f7f2 100644 --- a/util/jwt.lua +++ b/util/jwt.lua @@ -141,8 +141,12 @@ local function new_ecdsa_algorithm(name, c_sign, c_verify, sig_bytes) return r..s; end + local expected_sig_length = sig_bytes*2; local function decode_ecdsa_sig(jwk_sig) - return crypto.build_ecdsa_signature(jwk_sig:sub(1, sig_bytes), jwk_sig:sub(sig_bytes+1, sig_bytes*2)); + if #jwk_sig ~= expected_sig_length then + return nil; + end + return crypto.build_ecdsa_signature(jwk_sig:sub(1, sig_bytes), jwk_sig:sub(sig_bytes+1)); end return new_crypto_algorithm(name, "id-ecPublicKey", c_sign, c_verify, encode_ecdsa_sig, decode_ecdsa_sig); end |