(add) iOS implementation

ios/RCTPBKDF2/RCTPBKDF2.h

@@ -0,0 +1,5 @@
+#import <React/RCTBridgeModule.h>
+
+@interface RCTPBKDF2 : NSObject <RCTBridgeModule>
+
+@end

ios/RCTPBKDF2/RCTPBKDF2.m

@@ -0,0 +1,20 @@
+#import "RCTPBKDF2.h"
+#import "PBKDF2.h"
+
+@implementation RCTPBKDF2
+
+RCT_EXPORT_MODULE()
+
+RCT_EXPORT_METHOD(derivationKey:(NSString *)password salt:(NSString *)salt iterations:(nonnull NSNumber *)iterations
+                  resolver:(RCTPromiseResolveBlock)resolve
+                  rejecter:(RCTPromiseRejectBlock)reject) {
+    NSError *error = nil;
+    NSString *data = [PBKDF2 derivationKey:password salt:salt iterations: iterations];
+    if (data == nil) {
+        reject(@"keygen_fail", @"Key generation failed", error);
+    } else {
+        resolve(data);
+    }
+}
+
+@end

ios/RCTPBKDF2/lib/PBKDF2.h

@@ -0,0 +1,6 @@
+#import <Foundation/Foundation.h>
+
+@interface PBKDF2 : NSObject
++ (NSString *) derivationKey:(NSString *)password salt: (NSString *)salt iterations: (nonnull NSNumber *)iterations;
++ (NSString *) toHex: (NSData *)nsdata;
+@end

ios/RCTPBKDF2/lib/PBKDF2.m

@@ -0,0 +1,44 @@
+#import <CommonCrypto/CommonCryptor.h>
+#import <CommonCrypto/CommonDigest.h>
+#import <CommonCrypto/CommonKeyDerivation.h>
+
+#import "PBKDF2.h"
+
+@implementation PBKDF2
+
++ (NSString *) toHex:(NSData *)nsdata {
+    NSString * hexStr = [NSString stringWithFormat:@"%@", nsdata];
+    for(NSString * toRemove in [NSArray arrayWithObjects:@"<", @">", @" ", nil])
+        hexStr = [hexStr stringByReplacingOccurrencesOfString:toRemove withString:@""];
+    return hexStr;
+}
+
++ (NSString *) derivationKey:(NSString *)password salt: (NSString *)salt iterations: (nonnull NSNumber *)iterations {
+    // Data of String to generate Hash key(hexa decimal string).
+    NSData *passwordData = [password dataUsingEncoding:NSUTF8StringEncoding];
+    NSData *saltData = [salt dataUsingEncoding:NSUTF8StringEncoding];
+
+    // Hash key (hexa decimal) string data length.
+    NSMutableData *hashKeyData = [NSMutableData dataWithLength:CC_SHA512_DIGEST_LENGTH];
+
+    // Key Derivation using PBKDF2 algorithm.
+    int status = CCKeyDerivationPBKDF(
+                    kCCPBKDF2,
+                    passwordData.bytes,
+                    passwordData.length,
+                    saltData.bytes,
+                    saltData.length,
+                    kCCPRFHmacAlgSHA512,
+                    iterations,
+                    hashKeyData.mutableBytes,
+                    hashKeyData.length);
+
+    if (status == kCCParamError) {
+        NSLog(@"Key derivation error");
+        return @"";
+    }
+
+    return [self toHex:hashKeyData];
+}
+
+@end

ios/RNPBKDF2.xcodeproj/project.pbxproj

@@ -0,0 +1,282 @@
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+}