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- #import <Foundation/NSString.h>
- #import <CommonCrypto/CommonHMAC.h>
- #import <CommonCrypto/CommonDigest.h>
- @interface NSString (NSStringAdditions)
- + (NSString *) base64StringFromData:(NSData *)data length:(int)length;
- - (NSString *) base64StringWithHMACSHA1Digest:(NSString *)secretKey;
- @end
- -------------------------------------------
- #import "NSStringAdditions.h"
- static char base64EncodingTable[64] = {
- 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
- 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
- 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
- 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'
- };
- @implementation NSString (NSStringAdditions)
- - (NSString *) base64StringWithHMACSHA1Digest:(NSString *)secretKey {
- unsigned char digest[CC_SHA1_DIGEST_LENGTH];
- char *keyCharPtr = strdup([secretKey UTF8String]);
- char *dataCharPtr = strdup([self UTF8String]);
- CCHmacContext hctx;
- CCHmacInit(&hctx, kCCHmacAlgSHA1, keyCharPtr, strlen(keyCharPtr));
- CCHmacUpdate(&hctx, dataCharPtr, strlen(dataCharPtr));
- CCHmacFinal(&hctx, digest);
- NSData *encryptedStringData = [NSData dataWithBytes:digest length:CC_SHA1_DIGEST_LENGTH];
- free(keyCharPtr);
- free(dataCharPtr);
- return [NSString base64StringFromData:encryptedStringData length:[encryptedStringData length]];
- }
- + (NSString *) base64StringFromData: (NSData *)data length: (int)length {
- unsigned long ixtext, lentext;
- long ctremaining;
- unsigned char input[3], output[4];
- short i, charsonline = 0, ctcopy;
- const unsigned char *raw;
- NSMutableString *result;
- lentext = [data length];
- if (lentext < 1)
- return @"";
- result = [NSMutableString stringWithCapacity: lentext];
- raw = [data bytes];
- ixtext = 0;
- while (true) {
- ctremaining = lentext - ixtext;
- if (ctremaining <= 0)
- break;
- for (i = 0; i < 3; i++) {
- unsigned long ix = ixtext + i;
- if (ix < lentext)
- input[i] = raw[ix];
- else
- input[i] = 0;
- }
- output[0] = (input[0] & 0xFC) >> 2;
- output[1] = ((input[0] & 0x03) << 4) | ((input[1] & 0xF0) >> 4);
- output[2] = ((input[1] & 0x0F) << 2) | ((input[2] & 0xC0) >> 6);
- output[3] = input[2] & 0x3F;
- ctcopy = 4;
- switch (ctremaining) {
- case 1:
- ctcopy = 2;
- break;
- case 2:
- ctcopy = 3;
- break;
- }
- for (i = 0; i < ctcopy; i++)
- [result appendString: [NSString stringWithFormat: @"%c", base64EncodingTable[output[i]]]];
- for (i = ctcopy; i < 4; i++)
- [result appendString: @"="];
- ixtext += 3;
- charsonline += 4;
- if ((length > 0) && (charsonline >= length))
- charsonline = 0;
- return result;
- }
- @end
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