SM3: ShangMi 3 Cryptographic Hash Function

SM3 is a cryptographic has function that creates a 256-bit (32-byte) value to improve system security to generate secure hash values.

SM3 is a cryptographic hash function that creates a 256-bit (32-byte) value to improve system security. 

This function is designed primarily to generate secure hash values by the Chinese National Cryptography Administration. 

Its features expand to include crucial security operations like digital signatures and random number generation. 

This function works perfectly for an environment where sensitive data has to be protected.

Key Features

  • 100% written in Swift
  • Swift 6.2 with full strict concurrency support
  • Tested using official test vectors
  • Supports single-call and streaming APIs
  • Efficient bit-level operations

Pros & Cons

ProsCons
SM3 security level is similar to SHA-256 and also good against prominent cryptographic attacks, such as pre-image attacks and collisions.Pure Swift implementation may be slower than low-level C/C++ implementations for performance-sensitive applications.
Consistently processes messages by padding, expanding each block, and running compression rounds.Performance gains may vary because SIMD8 optimization only applies where data dependencies allow.
512-bit blocks and 256-bit output features make it handle data efficiently.It may limit interoperability because SM3 is not internationally adopted like SHA-256
It has SIMD8 optimizations, which give fast throughput of around 120 MB/s for large data.It has a complex internal structure, which gives developers challenges to implement, especially when they don’t have a thorough background in cryptographic principles.
Pure Swift implementation makes it lightweight because no extra dependencies

Pricing & Plans

The SM3 hash function is free to use. The Chinese National Cryptography Administration did not include any associated costs or subscription model, so that developers and teams can have access to a reliable cryptographic hash function.

Conclusion

SM3 is an efficient cryptographic hash function that a developer can use as an alternative to SHA-254. It’s also a lightweight solution boasting features like single-call, streaming APIs, SIMD8 optimizations, and concurrency support.

While it’s not internationally adopted, it is a great option for sensitive workflows like data hashing or digital signatures.