subtlecrypto_impl.md

.NET Crypto mapping to SubtleCrypto

This document represents a possible mapping of SubtleCrypto APIs that can be used to implement the .NET Crypto API. SubtleCrypto is an implementation of the WebCrypto API. The WebCrypto API has a table for algorithm support here.

Symmetric encryption

• AES - SubtleCrypto.encrypt(), SubtleCrypto.generateKey()
  • Supports AES-CTR, AES-CBC, AES-GCM, AES-KW
  • For AES-CBC the only available padding is PKCS#7.
• TripleDES - Not supported
• RC2 - Not supported
• DES - Not supported

Asymmetric cryptography

• RSA - SubtleCrypto.encrypt()
  • Supports RSA-OAEP.
• ECDsa - SubtleCrypto.encrypt()
  • WebCrypto - https://www.w3.org/TR/WebCryptoAPI/#ecdsa
• ECDiffieHellman - SubtleCrypto.generateKey()
  • WebCrypto - https://www.w3.org/TR/WebCryptoAPI/#ecdh
• DSA - Not supported
  • Node.js has an extension for support.

Hashing

• MD5 - Not supported
• SHA1 - SubtleCrypto.digest()
• SHA256 - SubtleCrypto.digest()
• SHA384 - SubtleCrypto.digest()
• SHA512 - SubtleCrypto.digest()
• HMAC - SubtleCrypto.sign(), SubtleCrypto.generateKey()
  • Supports SHA1, SHA256, SHA384, SHA512

Other

• RandomNumberGenerator - Crypto.getRandomValues().