95 lines
3.2 KiB
Mathematica
95 lines
3.2 KiB
Mathematica
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// MPOAuthSignatureParameter.m
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// MPOAuthConnection
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//
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// Created by Karl Adam on 08.12.07.
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// Copyright 2008 matrixPointer. All rights reserved.
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//
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#import "MPOAuthSignatureParameter.h"
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#import "MPOAuthURLRequest.h"
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#import "NSString+URLEscapingAdditions.h"
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#import "NSURL+MPURLParameterAdditions.h"
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#import <openssl/evp.h>
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#include <openssl/hmac.h>
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#include "Base64Transcoder.h"
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@interface MPOAuthSignatureParameter ()
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- (id)initUsingHMAC_SHA1WithText:(NSString *)inText andSecret:(NSString *)inSecret forRequest:(MPOAuthURLRequest *)inRequest;
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@end
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@implementation MPOAuthSignatureParameter
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+ (NSString *)signatureBaseStringUsingParameterString:(NSString *)inParameterString forRequest:(MPOAuthURLRequest *)inRequest {
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return [NSString stringWithFormat:@"%@&%@&%@", [inRequest HTTPMethod],
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[[inRequest.url absoluteNormalizedString] stringByAddingURIPercentEscapesUsingEncoding:NSUTF8StringEncoding],
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[inParameterString stringByAddingURIPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
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}
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+ (NSString *)HMAC_SHA1SignatureForText:(NSString *)inText usingSecret:(NSString *)inSecret {
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NSData *secretData = [inSecret dataUsingEncoding:NSUTF8StringEncoding];
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NSData *textData = [inText dataUsingEncoding:NSUTF8StringEncoding];
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OpenSSL_add_all_algorithms();
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unsigned char outbuf[SHA_DIGEST_LENGTH];
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unsigned int templen;
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HMAC_CTX ctx;
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const EVP_MD *digest = EVP_sha1();
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if(!digest) {
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NSLog(@"cannot get digest with name SHA1");
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return nil;
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}
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HMAC_CTX_init(&ctx);
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HMAC_Init(&ctx, [secretData bytes], [secretData length], digest);
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HMAC_Update(&ctx, [textData bytes], [textData length]);
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HMAC_Final(&ctx, outbuf, &templen);
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HMAC_CTX_cleanup(&ctx);
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//Base64 Encoding
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char base64Result[32];
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size_t theResultLength = 32;
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Base64EncodeData(outbuf, 20, base64Result, &theResultLength);
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NSData *theData = [NSData dataWithBytes:base64Result length:theResultLength];
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NSString *base64EncodedResult = [[[NSString alloc] initWithData:theData encoding:NSUTF8StringEncoding] autorelease];
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return base64EncodedResult;
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}
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- (id)initWithText:(NSString *)inText andSecret:(NSString *)inSecret forRequest:(MPOAuthURLRequest *)inRequest usingMethod:(NSString *)inMethod {
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if ([inMethod isEqual:kMPOAuthSignatureMethodHMACSHA1]) {
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self = [self initUsingHMAC_SHA1WithText:inText andSecret:inSecret forRequest:inRequest];
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} else if ([inMethod isEqualToString:kMPOAuthSignatureMethodPlaintext]) {
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if (self = [super init]) {
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[self setName:@"oauth_signature"];
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[self setValue:inSecret];
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}
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} else {
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[self release];
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self = nil;
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[NSException raise:@"Unsupported Signature Method" format:@"The signature method \"%@\" is not currently support by MPOAuthConnection", inMethod];
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}
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return self;
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}
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- (id)initUsingHMAC_SHA1WithText:(NSString *)inText andSecret:(NSString *)inSecret forRequest:(MPOAuthURLRequest *)inRequest {
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if (self = [super init]) {
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NSString *signatureBaseString = [MPOAuthSignatureParameter signatureBaseStringUsingParameterString:inText forRequest:inRequest];
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[self setName:@"oauth_signature"];
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[self setValue:[MPOAuthSignatureParameter HMAC_SHA1SignatureForText:signatureBaseString usingSecret:inSecret]];
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}
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return self;
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}
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- (oneway void)dealloc {
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[super dealloc];
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}
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@end
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