CODEWITHSUNDEEP
iosswiftobjective-copensslcommoncrypto
arunna
arunna

Reputation: 1

Is there an iOS alternative to openssl's EVP_BytesToKey?

I want to make an AES 256 CBC key and iv with SHA1 digest like in openssl's EVP_BytesToKey function, but with iOS tools. Is there an iOS alternative for that?

In openssl it looks like:

int ret = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha1(), salt, keyingData, strlen(keyingData), 2048 /*iteration*/, resultKey, resultIV);

Later I want to use that generated key (resultKey) and iv (resultIV) in CommonCrypto's CCCrypt, but I don't know how to generate them with iOS tools. Please help.

UPDATE

I've found a code snippet in this video, which maybe do the job, but I'm not sure. Also it's just the key, the IV is still unknown to me.

let keyByteCount = 256/8
var key = Array(repeating: 0, count: keyByteCount)
let error = SecRandomCopyBytes(kSecRandomDefault, keyByteCount, &key)
if error != errSecSuccess {
    return 1
}
memset_s(&key, keyByteCount, 0, keyByteCount)

But I think this is not what I'm looking for, because it doesn't require a salt or iteration count or any algorithm (like SHA1).

Upvotes: 0

Views: 207

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