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Is there any example for use ECC in iOS? I noticed that the kSecAttrKeyTypeEC in Apple Developer Documents, but I can't use it to generic Key pair. Below code is modified from the example CryptoExercise // Container dictionaries. NSMutableDictionary * privateKeyAttr = [[NSMutableDictionary alloc] init]; NSMutableDictionary * publicKeyAttr = [[NSMutableDictionary alloc] init]; NSMutableDictionary * keyPairAttr = [[NSMutableDictionary alloc] init]; // Set top level dictionary for the keypair. [keyPairAttr setObject:(id)kSecAttrKeyTypeEC forKey:(id)kSecAttrKeyType]; [keyPairAttr setObject:[NSNumber numberWithUnsignedInteger:keySize] forKey:(id)kSecAttrKeySizeInBits]; // Set the private key dictionary. [privateKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecAttrIsPermanent]; [privateKeyAttr setObject:privateTag forKey:(id)kSecAttrApplicationTag]; // See SecKey.h to set other flag values. // Set the public key dictionary. [publicKeyAttr setObject:[NSNumber numberWithBool:YES] forKey:(id)kSecAttrIsPermanent]; [publicKeyAttr setObject:publicTag forKey:(id)kSecAttrApplicationTag]; // See SecKey.h to set other flag values. // Set attributes to top level dictionary. [keyPairAttr setObject:privateKeyAttr forKey:(id)kSecPrivateKeyAttrs]; [keyPairAttr setObject:publicKeyAttr forKey:(id)kSecPublicKeyAttrs]; // SecKeyGeneratePair returns the SecKeyRefs just for educational purposes. sanityCheck = SecKeyGeneratePair((CFDictionaryRef)keyPairAttr, &publicKeyRef, &privateKeyRef); LOGGING_FACILITY( sanityCheck == noErr && publicKeyRef != NULL && privateKeyRef != NULL, @"Something really bad went wrong with generating the key pair." ); The sanityCheck always return -50 which means 'errSecParam'. I really don't know how to use it, thank you for read this.

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