I would like to generate a cryptographically random key, use that to encrypt the data with a symmetric cypher (AES typically) and then encrypt the random key with RSA.
How can I do it in swift? Is it possible with CryptoKit or CommonCrypto ?
Thanks
CryptoKit does not support RSA, because its focus is on algorithms that are efficient and secure by default, and RSA fits neither of those categories. If you insist on using RSA, you’ll have to use Security framework, and specifically:
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SecKeyCreateRandomKeyto generate a private key. -
SecKeyCopyPublicKeyto get the public key from that. -
SecKeyCreateEncryptedDatato encrypt with the public key. -
SecKeyCreateDecryptedDatato decrypt with the private key.
On the AES front, it depends on mode you’re looking for:
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CommonCrypto supports AES-ECB and AES-CBC.
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CryptoKit supports AES-GCM [1].
The CryptoCompatibility sample code shows many of these APIs in action.
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[1] Because the other AES modes are not secure by default.