Smart Card Engineering Tools

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All tools run entirely in your browser. No data is uploaded to any server.

NDEF Message Parser & Generator NEW — Parse and build NFC NDEF messages, all TNF types, chunked records
NFC Tag Capacity Calculator NEW — Compare NTAG213/215/216, MIFARE, Type 1-5 usable NDEF capacity
MIFARE Classic Access Bits Calculator NEW — Sector trailer C1/C2/C3 permissions, access bytes 6-9 hex generator & decoder
NDEF Writer Simulator NEW — Simulate writing NDEF messages to tags, see memory fill before physical write
NFC Forum Tag Type Detector NEW — Identify tag type (1/2/3/4/5/MIFARE) from ATR, ATS, ATQA, SAK bytes

APDU Command Builder & Parser NEW — Interactive Case 1-4 APDU construction, extended APDU, presets
EMV TLV Parser & DOL Builder NEW — BER-TLV decode, EMV tag search, PDOL/CDOL/DDOL builder
EMV CVM List Decoder NEW — Cardholder Verification Method list, CVM condition & type parser
ASN.1 DER Parser NEW — Tree-view ASN.1 decoder, OID resolution, X.509 cert support
APDU Response Debugger NEW — Paste response hex, get byte-level SW1 SW2 explanation & next-step hints
ISO 7816-4 File System Explorer NEW — Interactive MF/DF/EF tree, SELECT simulation, FCI data visualization
APDU Status Word Lookup — Search SW1 SW2 codes (9000, 6A82, 61XX...)
ATR Decoder NEW — Parse ISO 7816-3 Answer-To-Reset, T=0/T=1 detection, interface bytes
GP Session Key Calculator NEW — SCP02 3DES-CBC / SCP03 AES-CMAC KDF session key derivation, MAC calculator
BER-TLV Parser NEW — Parse hex BER-TLV data, nested constructed tags, EMV/GP/ISO 7816 format
EMV Tag Lookup NEW — Searchable EMVCo tag reference, all Books 3/4 data objects by tag or keyword

FIDO2 CBOR Attestation Parser NEW — Parse WebAuthn attestation, authData, AAGUID, COSE key
Key Diversification Calculator NEW — EMV CSK Option A/B, Visa SD, Mastercard CAP, 3DES/AES in-browser
3DES/AES Session Key Visualizer NEW — Step-by-step key derivation, SCP02/SCP03 compatible
Crypto Checksum Verifier NEW — CRC-16/32, LRC, 3DES Retail-MAC, AES-CMAC online calculator
EMV Application Cryptogram Visualizer NEW — ARQC/ARPC/TC/AAC step-by-step, 3DES MAC computation
EMV Contactless Payment Flow NEW — Full SELECT PPSE → GPO → READ RECORD → GENERATE AC APDU trace reference
Hash Digest Calculator NEW — MD5, SHA-1, SHA-256, SHA-384, SHA-512, SM3 hash calculator with HMAC mode
AES / SM4 Encryption NEW — AES-128/192/256 CBC/GCM/ECB & SM4-CBC symmetric encryption with random key generator
RSA Asymmetric NEW — RSA key generation 2048/3072/4096-bit, OAEP encrypt/decrypt, PKCS#1 v1.5 sign/verify
SM2 Chinese Crypto NEW — Chinese national standard elliptic curve: key generation, C1C2C3 encrypt/decrypt, sign/verify
X.509 Cert Parser NEW — Parse PEM/DER certificates, view subject, SANs, fingerprints (SHA-1/SHA-256), all extensions
JWT Decoder & Debugger NEW — Decode JWT header/payload, verify HS256/RS256 signatures, detect expired tokens, all client-side
HMAC Generator & Verifier NEW — Compute HMAC-MD5/SHA1/SHA256/SHA384/SHA512 with text/hex/Base64 key input, verify signatures

CRC Calculator NEW — CRC-8/16/32/64 with 17 variants, real-time hex & ASCII input
Luhn Algorithm Validator NEW — Credit card, IMEI, ICCID validation & check digit generation, BIN lookup
Base64 Encoder / Decoder NEW — Standard, URL-safe, and MIME Base64 encoding & decoding with real-time conversion
URL Encoder / Decoder NEW — encodeURIComponent / encodeURI modes, batch processing, reserved character reference
Hex Converter NEW — Hex/decimal/binary/octal converter, 8-64 bit signed/unsigned, endian swap, BCD EMV amount
ASN.1 DER Parser — Tree-view ASN.1 decoder, OID resolution, X.509 cert support
PBKDF2 Key Derivation Calculator NEW — PBKDF2-HMAC-SHA256/SHA1/SHA512, custom iterations, salt, WPA2 verification
HOTP & TOTP Calculator NEW — Generate and verify one-time passwords, HMAC-based (RFC 4226) and time-based (RFC 6238), SHA-1/256/512
CBOR Decoder NEW — Parse CBOR (RFC 8949) data from hex input, FIDO2 CTAP2, COSE, SenML, CDDL development