SM4 Encrypt / Decrypt

Security & Authentication

Encrypt and decrypt text with SM4 using ECB or CBC mode.

SM4 Crypto

National cryptography tools for compatibility and migration checks.

Text / signature

SM4 Key (HEX)

IV (HEX)

Use cases

When to use SM4 Encrypt / Decrypt

Encrypt and decrypt text with SM4 using ECB or CBC mode.

1Prepare sm4 encrypt / decrypt output for an API or documentation workflow

2Check a sample before applying it to production

3Use a reproducible result while debugging with a teammate

4Reproduce signature flows used by webhooks, API gateways, and third-party services

5Compare JWT claims, digest algorithms, and secret encoding across systems

6Prepare redacted but reproducible token examples for security review

7Verify Bcrypt, Scrypt, SCRAM, and database password hashes

8Inspect X.509 validity, issuer, algorithms, and fingerprints

9Debug AES-GCM, RSA-OAEP, RSA-PSS, and PKCS#1 signature flows

Guidance

Platform-specific rules and production policies still require review.

Generate SHA family digests from text.

Generate and compare MD5 checksums for text or files.

Decode JWT claims and inspect common time-based fields.

Generate HMAC signatures from a message and shared secret.