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+// original: https://github.com/mattt/TransformerKit/blob/master/TransformerKit%2FTTTDataTransformer.m
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+// copied and modified for benchmarking
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+
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+// TTTDataTransformer.m
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+//
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+// Copyright (c) 2014 Mattt Thompson (http://mattt.me)
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining a copy
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+// of this software and associated documentation files (the "Software"), to deal
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+// in the Software without restriction, including without limitation the rights
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+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the Software is
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+// furnished to do so, subject to the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be included in
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+// all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+// THE SOFTWARE.
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+
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+#import <Security/Security.h>
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+
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+#import "TTTDataTransformer.h"
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+
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+NSString * TTTBase32EncodedStringFromData(NSData *data) {
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+ SecTransformRef transform = SecEncodeTransformCreate(kSecBase32Encoding, NULL);
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+ SecTransformSetAttribute(transform, kSecTransformInputAttributeName, (__bridge CFDataRef)data, NULL);
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+ NSData *encodedData = (__bridge_transfer NSData *)SecTransformExecute(transform, NULL);
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+ CFRelease(transform);
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+
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+ return [[NSString alloc] initWithData:encodedData encoding:NSUTF8StringEncoding];
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+}
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+
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+NSData * TTTDataFromBase32EncodedString(NSString *string) {
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+ SecTransformRef transform = SecDecodeTransformCreate(kSecBase32Encoding, NULL);
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+ SecTransformSetAttribute(transform, kSecTransformInputAttributeName, (__bridge CFDataRef)[string dataUsingEncoding:NSUTF8StringEncoding], NULL);
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+ NSData *decodedData = (__bridge_transfer NSData *)SecTransformExecute(transform, NULL);
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+ CFRelease(transform);
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+
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+ return decodedData;
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+}
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Norio Nomura