// // DES3Util.h // #import <Foundation/Foundation.h> @interface DES3Util : NSObject { } // 加密方法 + (NSString*)encrypt:(NSString*)plainText; // 解密方法 + (NSString*)decrypt:(NSString*)encryptText; @end // // DES3Util.m // #import "DES3Util.h" #import <CommonCrypto/CommonCryptor.h> #import "GTMBase64.h" #define gkey @"my.oschina.net/penngo?#@" #define gIv @"01234567" @implementation DES3Util // 加密方法 + (NSString*)encrypt:(NSString*)plainText { NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding]; size_t plainTextBufferSize = [data length]; const void *vplainText = (const void *)[data bytes]; CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t movedBytes = 0; bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); memset((void *)bufferPtr, 0x0, bufferPtrSize); const void *vkey = (const void *) [gkey UTF8String]; const void *vinitVec = (const void *) [gIv UTF8String]; ccStatus = CCCrypt(kCCEncrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding, vkey, kCCKeySize3DES, vinitVec, vplainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, &movedBytes); NSData *myData = [NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes]; NSString *result = [GTMBase64 stringByEncodingData:myData]; return result; } // 解密方法 + (NSString*)decrypt:(NSString*)encryptText { NSData *encryptData = [GTMBase64 decodeData:[encryptText dataUsingEncoding:NSUTF8StringEncoding]]; size_t plainTextBufferSize = [encryptData length]; const void *vplainText = [encryptData bytes]; CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t movedBytes = 0; bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) & ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t)); memset((void *)bufferPtr, 0x0, bufferPtrSize); const void *vkey = (const void *) [gkey UTF8String]; const void *vinitVec = (const void *) [gIv UTF8String]; ccStatus = CCCrypt(kCCDecrypt, kCCAlgorithm3DES, kCCOptionPKCS7Padding, vkey, kCCKeySize3DES, vinitVec, vplainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, &movedBytes); NSString *result = [[[NSString alloc] initWithData:[NSData dataWithBytes:(const void *)bufferPtr length:(NSUInteger)movedBytes] encoding:NSUTF8StringEncoding] autorelease]; return result; } @end // // GTMBase64.h // // Copyright 2006-2008 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not // use this file except in compliance with the License. You may obtain a copy // of the License at // // // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the // License for the specific language governing permissions and limitations under // the License. // David Lee make changes: // Remove dependency on GTMDefines.h // add some string to string function #import <Foundation/Foundation.h> // GTMBase64 // /// Helper for handling Base64 and WebSafeBase64 encodings // /// The webSafe methods use different character set and also the results aren't /// always padded to a multiple of 4 characters. This is done so the resulting /// data can be used in urls and url query arguments without needing any /// encoding. You must use the webSafe* methods together, the data does not /// interop with the RFC methods. // @interface GTMBase64 : NSObject // // Standard Base64 (RFC) handling // // encodeData: // /// Base64 encodes contents of the NSData object. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)encodeData:(NSData *)data; // decodeData: // /// Base64 decodes contents of the NSData object. // /// Returns: /// A new autoreleased NSData with the decoded payload. nil for any error. // +(NSData *)decodeData:(NSData *)data; // encodeBytes:length: // /// Base64 encodes the data pointed at by |bytes|. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)encodeBytes:(const void *)bytes length:(NSUInteger)length; // decodeBytes:length: // /// Base64 decodes the data pointed at by |bytes|. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)decodeBytes:(const void *)bytes length:(NSUInteger)length; // stringByEncodingData: // /// Base64 encodes contents of the NSData object. // /// Returns: /// A new autoreleased NSString with the encoded payload. nil for any error. // +(NSString *)stringByEncodingData:(NSData *)data; // stringByEncodingBytes:length: // /// Base64 encodes the data pointed at by |bytes|. // /// Returns: /// A new autoreleased NSString with the encoded payload. nil for any error. // +(NSString *)stringByEncodingBytes:(const void *)bytes length:(NSUInteger)length; // decodeString: // /// Base64 decodes contents of the NSString. // /// Returns: /// A new autoreleased NSData with the decoded payload. nil for any error. // +(NSData *)decodeString:(NSString *)string; // // Modified Base64 encoding so the results can go onto urls. // // The changes are in the characters generated and also allows the result to // not be padded to a multiple of 4. // Must use the matching call to encode/decode, won't interop with the // RFC versions. // // webSafeEncodeData:padded: // /// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES /// then padding characters are added so the result length is a multiple of 4. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)webSafeEncodeData:(NSData *)data padded:(BOOL)padded; // webSafeDecodeData: // /// WebSafe Base64 decodes contents of the NSData object. // /// Returns: /// A new autoreleased NSData with the decoded payload. nil for any error. // +(NSData *)webSafeDecodeData:(NSData *)data; // webSafeEncodeBytes:length:padded: // /// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES /// then padding characters are added so the result length is a multiple of 4. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)webSafeEncodeBytes:(const void *)bytes length:(NSUInteger)length padded:(BOOL)padded; // webSafeDecodeBytes:length: // /// WebSafe Base64 decodes the data pointed at by |bytes|. // /// Returns: /// A new autoreleased NSData with the encoded payload. nil for any error. // +(NSData *)webSafeDecodeBytes:(const void *)bytes length:(NSUInteger)length; // stringByWebSafeEncodingData:padded: // /// WebSafe Base64 encodes contents of the NSData object. If |padded| is YES /// then padding characters are added so the result length is a multiple of 4. // /// Returns: /// A new autoreleased NSString with the encoded payload. nil for any error. // +(NSString *)stringByWebSafeEncodingData:(NSData *)data padded:(BOOL)padded; // stringByWebSafeEncodingBytes:length:padded: // /// WebSafe Base64 encodes the data pointed at by |bytes|. If |padded| is YES /// then padding characters are added so the result length is a multiple of 4. // /// Returns: /// A new autoreleased NSString with the encoded payload. nil for any error. // +(NSString *)stringByWebSafeEncodingBytes:(const void *)bytes length:(NSUInteger)length padded:(BOOL)padded; // webSafeDecodeString: // /// WebSafe Base64 decodes contents of the NSString. // /// Returns: /// A new autoreleased NSData with the decoded payload. nil for any error. // +(NSData *)webSafeDecodeString:(NSString *)string; // David Lee new added function /// Returns: // A new autoreleased NSString with Base64 encoded NSString +(NSString *)stringByBase64String:(NSString *)base64String; // David Lee new added function /// Returns: // A new autoreleased Base64 encoded NSString with NSString +(NSString *)base64StringBystring:(NSString *)string; @end // // GTMBase64.m // // Copyright 2006-2008 Google Inc. // // Licensed under the Apache License, Version 2.0 (the "License"); you may not // use this file except in compliance with the License. You may obtain a copy // of the License at // // // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the // License for the specific language governing permissions and limitations under // the License. // David Lee make changes: // Remove dependency on GTMDefines.h // add some string to string function #import "GTMBase64.h" static const char *kBase64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static const char *kWebSafeBase64EncodeChars = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; static const char kBase64PaddingChar = '='; static const char kBase64InvalidChar = 99; static const char kBase64DecodeChars[] = { // This array was generated by the following code: // #include <sys/time.h> // #include <stdlib.h> // #include <string.h> // main() // { // static const char Base64[] = // "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; // char *pos; // int idx, i, j; // printf(" "); // for (i = 0; i < 255; i += 8) { // for (j = i; j < i + 8; j++) { // pos = strchr(Base64, j); // if ((pos == NULL) || (j == 0)) // idx = 99; // else // idx = pos - Base64; // if (idx == 99) // printf(" %2d, ", idx); // else // printf(" %2d/*%c*/,", idx, j); // } // printf("\n "); // } // } 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62/*+*/, 99, 99, 99, 63/*/ */, 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/, 60/*8*/, 61/*9*/, 99, 99, 99, 99, 99, 99, 99, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/, 7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/, 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/, 23/*X*/, 24/*Y*/, 25/*Z*/, 99, 99, 99, 99, 99, 99, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/, 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/, 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/, 49/*x*/, 50/*y*/, 51/*z*/, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99 }; static const char kWebSafeBase64DecodeChars[] = { // This array was generated by the following code: // #include <sys/time.h> // #include <stdlib.h> // #include <string.h> // main() // { // static const char Base64[] = // "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_"; // char *pos; // int idx, i, j; // printf(" "); // for (i = 0; i < 255; i += 8) { // for (j = i; j < i + 8; j++) { // pos = strchr(Base64, j); // if ((pos == NULL) || (j == 0)) // idx = 99; // else // idx = pos - Base64; // if (idx == 99) // printf(" %2d, ", idx); // else // printf(" %2d/*%c*/,", idx, j); // } // printf("\n "); // } // } 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 62/*-*/, 99, 99, 52/*0*/, 53/*1*/, 54/*2*/, 55/*3*/, 56/*4*/, 57/*5*/, 58/*6*/, 59/*7*/, 60/*8*/, 61/*9*/, 99, 99, 99, 99, 99, 99, 99, 0/*A*/, 1/*B*/, 2/*C*/, 3/*D*/, 4/*E*/, 5/*F*/, 6/*G*/, 7/*H*/, 8/*I*/, 9/*J*/, 10/*K*/, 11/*L*/, 12/*M*/, 13/*N*/, 14/*O*/, 15/*P*/, 16/*Q*/, 17/*R*/, 18/*S*/, 19/*T*/, 20/*U*/, 21/*V*/, 22/*W*/, 23/*X*/, 24/*Y*/, 25/*Z*/, 99, 99, 99, 99, 63/*_*/, 99, 26/*a*/, 27/*b*/, 28/*c*/, 29/*d*/, 30/*e*/, 31/*f*/, 32/*g*/, 33/*h*/, 34/*i*/, 35/*j*/, 36/*k*/, 37/*l*/, 38/*m*/, 39/*n*/, 40/*o*/, 41/*p*/, 42/*q*/, 43/*r*/, 44/*s*/, 45/*t*/, 46/*u*/, 47/*v*/, 48/*w*/, 49/*x*/, 50/*y*/, 51/*z*/, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99, 99 }; // Tests a character to see if it's a whitespace character. // // Returns: // YES if the character is a whitespace character. // NO if the character is not a whitespace character. // BOOL IsSpace(unsigned char c) { // we use our own mapping here because we don't want anything w/ locale // support. static BOOL kSpaces[256] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, // 0-9 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, // 10-19 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 20-29 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, // 30-39 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 40-49 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 50-59 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 60-69 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 70-79 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 80-89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 90-99 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 100-109 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 110-119 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 120-129 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 130-139 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 140-149 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 150-159 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 160-169 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 170-179 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 180-189 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 190-199 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 200-209 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 210-219 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 220-229 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 230-239 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // 240-249 0, 0, 0, 0, 0, 1, // 250-255 }; return kSpaces[c]; } // Calculate how long the data will be once it's base64 encoded. // // Returns: // The guessed encoded length for a source length // NSUInteger CalcEncodedLength(NSUInteger srcLen, BOOL padded) { NSUInteger intermediate_result = 8 * srcLen + 5; NSUInteger len = intermediate_result / 6; if (padded) { len = ((len + 3) / 4) * 4; } return len; } // Tries to calculate how long the data will be once it's base64 decoded. // Unlike the above, this is always an upperbound, since the source data // could have spaces and might end with the padding characters on them. // // Returns: // The guessed decoded length for a source length // NSUInteger GuessDecodedLength(NSUInteger srcLen) { return (srcLen + 3) / 4 * 3; } @interface GTMBase64 (PrivateMethods) +(NSData *)baseEncode:(const void *)bytes length:(NSUInteger)length charset:(const char *)charset padded:(BOOL)padded; +(NSData *)baseDecode:(const void *)bytes length:(NSUInteger)length charset:(const char*)charset requirePadding:(BOOL)requirePadding; +(NSUInteger)baseEncode:(const char *)srcBytes srcLen:(NSUInteger)srcLen destBytes:(char *)destBytes destLen:(NSUInteger)destLen charset:(const char *)charset padded:(BOOL)padded; +(NSUInteger)baseDecode:(const char *)srcBytes srcLen:(NSUInteger)srcLen destBytes:(char *)destBytes destLen:(NSUInteger)destLen charset:(const char *)charset requirePadding:(BOOL)requirePadding; @end @implementation GTMBase64 // // Standard Base64 (RFC) handling // +(NSData *)encodeData:(NSData *)data { return [self baseEncode:[data bytes] length:[data length] charset:kBase64EncodeChars padded:YES]; } +(NSData *)decodeData:(NSData *)data { return [self baseDecode:[data bytes] length:[data length] charset:kBase64DecodeChars requirePadding:YES]; } +(NSData *)encodeBytes:(const void *)bytes length:(NSUInteger)length { return [self baseEncode:bytes length:length charset:kBase64EncodeChars padded:YES]; } +(NSData *)decodeBytes:(const void *)bytes length:(NSUInteger)length { return [self baseDecode:bytes length:length charset:kBase64DecodeChars requirePadding:YES]; } +(NSString *)stringByEncodingData:(NSData *)data { NSString *result = nil; NSData *converted = [self baseEncode:[data bytes] length:[data length] charset:kBase64EncodeChars padded:YES]; if (converted) { result = [[[NSString alloc] initWithData:converted encoding:NSASCIIStringEncoding] autorelease]; } return result; } +(NSString *)stringByEncodingBytes:(const void *)bytes length:(NSUInteger)length { NSString *result = nil; NSData *converted = [self baseEncode:bytes length:length charset:kBase64EncodeChars padded:YES]; if (converted) { result = [[[NSString alloc] initWithData:converted encoding:NSASCIIStringEncoding] autorelease]; } return result; } +(NSData *)decodeString:(NSString *)string { NSData *result = nil; NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding]; if (data) { result = [self baseDecode:[data bytes] length:[data length] charset:kBase64DecodeChars requirePadding:YES]; } return result; } // // Modified Base64 encoding so the results can go onto urls. // // The changes are in the characters generated and also the result isn't // padded to a multiple of 4. // Must use the matching call to encode/decode, won't interop with the // RFC versions. // +(NSData *)webSafeEncodeData:(NSData *)data padded:(BOOL)padded { return [self baseEncode:[data bytes] length:[data length] charset:kWebSafeBase64EncodeChars padded:padded]; } +(NSData *)webSafeDecodeData:(NSData *)data { return [self baseDecode:[data bytes] length:[data length] charset:kWebSafeBase64DecodeChars requirePadding:NO]; } +(NSData *)webSafeEncodeBytes:(const void *)bytes length:(NSUInteger)length padded:(BOOL)padded { return [self baseEncode:bytes length:length charset:kWebSafeBase64EncodeChars padded:padded]; } +(NSData *)webSafeDecodeBytes:(const void *)bytes length:(NSUInteger)length { return [self baseDecode:bytes length:length charset:kWebSafeBase64DecodeChars requirePadding:NO]; } +(NSString *)stringByWebSafeEncodingData:(NSData *)data padded:(BOOL)padded { NSString *result = nil; NSData *converted = [self baseEncode:[data bytes] length:[data length] charset:kWebSafeBase64EncodeChars padded:padded]; if (converted) { result = [[[NSString alloc] initWithData:converted encoding:NSASCIIStringEncoding] autorelease]; } return result; } +(NSString *)stringByWebSafeEncodingBytes:(const void *)bytes length:(NSUInteger)length padded:(BOOL)padded { NSString *result = nil; NSData *converted = [self baseEncode:bytes length:length charset:kWebSafeBase64EncodeChars padded:padded]; if (converted) { result = [[[NSString alloc] initWithData:converted encoding:NSASCIIStringEncoding] autorelease]; } return result; } +(NSData *)webSafeDecodeString:(NSString *)string { NSData *result = nil; NSData *data = [string dataUsingEncoding:NSASCIIStringEncoding]; if (data) { result = [self baseDecode:[data bytes] length:[data length] charset:kWebSafeBase64DecodeChars requirePadding:NO]; } return result; } // David Lee new added function /// Returns: // A new autoreleased NSString with Base64 encoded NSString +(NSString *)stringByBase64String:(NSString *)base64String { NSString *sourceString = [[[NSString alloc] initWithData:[GTMBase64 decodeData:[base64String dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO]] encoding:NSUTF8StringEncoding] autorelease]; return sourceString; } // David Lee new added function /// Returns: // A new autoreleased Base64 encoded NSString with NSString +(NSString *)base64StringBystring:(NSString *)string { NSString *base64String = [[[NSString alloc] initWithData:[GTMBase64 encodeData:[string dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:NO]] encoding:NSUTF8StringEncoding] autorelease]; return base64String; } @end @implementation GTMBase64 (PrivateMethods) // // baseEncode:length:charset:padded: // // Does the common lifting of creating the dest NSData. it creates & sizes the // data for the results. |charset| is the characters to use for the encoding // of the data. |padding| controls if the encoded data should be padded to a // multiple of 4. // // Returns: // an autorelease NSData with the encoded data, nil if any error. // +(NSData *)baseEncode:(const void *)bytes length:(NSUInteger)length charset:(const char *)charset padded:(BOOL)padded { // how big could it be? NSUInteger maxLength = CalcEncodedLength(length, padded); // make space NSMutableData *result = [NSMutableData data]; [result setLength:maxLength]; // do it NSUInteger finalLength = [self baseEncode:bytes srcLen:length destBytes:[result mutableBytes] destLen:[result length] charset:charset padded:padded]; if (finalLength) { NSAssert(finalLength == maxLength, @"how did we calc the length wrong?"); } else { // shouldn't happen, this means we ran out of space result = nil; } return result; } // // baseDecode:length:charset:requirePadding: // // Does the common lifting of creating the dest NSData. it creates & sizes the // data for the results. |charset| is the characters to use for the decoding // of the data. // // Returns: // an autorelease NSData with the decoded data, nil if any error. // // +(NSData *)baseDecode:(const void *)bytes length:(NSUInteger)length charset:(const char *)charset requirePadding:(BOOL)requirePadding { // could try to calculate what it will end up as NSUInteger maxLength = GuessDecodedLength(length); // make space NSMutableData *result = [NSMutableData data]; [result setLength:maxLength]; // do it NSUInteger finalLength = [self baseDecode:bytes srcLen:length destBytes:[result mutableBytes] destLen:[result length] charset:charset requirePadding:requirePadding]; if (finalLength) { if (finalLength != maxLength) { // resize down to how big it was [result setLength:finalLength]; } } else { // either an error in the args, or we ran out of space result = nil; } return result; } // // baseEncode:srcLen:destBytes:destLen:charset:padded: // // Encodes the buffer into the larger. returns the length of the encoded // data, or zero for an error. // |charset| is the characters to use for the encoding // |padded| tells if the result should be padded to a multiple of 4. // // Returns: // the length of the encoded data. zero if any error. // +(NSUInteger)baseEncode:(const char *)srcBytes srcLen:(NSUInteger)srcLen destBytes:(char *)destBytes destLen:(NSUInteger)destLen charset:(const char *)charset padded:(BOOL)padded { if (!srcLen || !destLen || !srcBytes || !destBytes) { return 0; } char *curDest = destBytes; const unsigned char *curSrc = (const unsigned char *)(srcBytes); // Three bytes of data encodes to four characters of cyphertext. // So we can pump through three-byte chunks atomically. while (srcLen > 2) { // space? NSAssert(destLen >= 4, @"our calc for encoded length was wrong"); curDest[0] = charset[curSrc[0] >> 2]; curDest[1] = charset[((curSrc[0] & 0x03) << 4) + (curSrc[1] >> 4)]; curDest[2] = charset[((curSrc[1] & 0x0f) << 2) + (curSrc[2] >> 6)]; curDest[3] = charset[curSrc[2] & 0x3f]; curDest += 4; curSrc += 3; srcLen -= 3; destLen -= 4; } // now deal with the tail (<=2 bytes) switch (srcLen) { case 0: // Nothing left; nothing more to do. break; case 1: // One byte left: this encodes to two characters, and (optionally) // two pad characters to round out the four-character cypherblock. NSAssert(destLen >= 2, @"our calc for encoded length was wrong"); curDest[0] = charset[curSrc[0] >> 2]; curDest[1] = charset[(curSrc[0] & 0x03) << 4]; curDest += 2; destLen -= 2; if (padded) { NSAssert(destLen >= 2, @"our calc for encoded length was wrong"); curDest[0] = kBase64PaddingChar; curDest[1] = kBase64PaddingChar; curDest += 2; } break; case 2: // Two bytes left: this encodes to three characters, and (optionally) // one pad character to round out the four-character cypherblock. NSAssert(destLen >= 3, @"our calc for encoded length was wrong"); curDest[0] = charset[curSrc[0] >> 2]; curDest[1] = charset[((curSrc[0] & 0x03) << 4) + (curSrc[1] >> 4)]; curDest[2] = charset[(curSrc[1] & 0x0f) << 2]; curDest += 3; destLen -= 3; if (padded) { NSAssert(destLen >= 1, @"our calc for encoded length was wrong"); curDest[0] = kBase64PaddingChar; curDest += 1; } break; } // return the length return (curDest - destBytes); } // // baseDecode:srcLen:destBytes:destLen:charset:requirePadding: // // Decodes the buffer into the larger. returns the length of the decoded // data, or zero for an error. // |charset| is the character decoding buffer to use // // Returns: // the length of the encoded data. zero if any error. // +(NSUInteger)baseDecode:(const char *)srcBytes srcLen:(NSUInteger)srcLen destBytes:(char *)destBytes destLen:(NSUInteger)destLen charset:(const char *)charset requirePadding:(BOOL)requirePadding { if (!srcLen || !destLen || !srcBytes || !destBytes) { return 0; } int decode; NSUInteger destIndex = 0; int state = 0; char ch = 0; while (srcLen-- && (ch = *srcBytes++) != 0) { if (IsSpace(ch)) // Skip whitespace continue; if (ch == kBase64PaddingChar) break; decode = charset[(unsigned int)ch]; if (decode == kBase64InvalidChar) return 0; // Four cyphertext characters decode to three bytes. // Therefore we can be in one of four states. switch (state) { case 0: // We're at the beginning of a four-character cyphertext block. // This sets the high six bits of the first byte of the // plaintext block. NSAssert(destIndex < destLen, @"our calc for decoded length was wrong"); destBytes[destIndex] = decode << 2; state = 1; break; case 1: // We're one character into a four-character cyphertext block. // This sets the low two bits of the first plaintext byte, // and the high four bits of the second plaintext byte. NSAssert((destIndex+1) < destLen, @"our calc for decoded length was wrong"); destBytes[destIndex] |= decode >> 4; destBytes[destIndex+1] = (decode & 0x0f) << 4; destIndex++; state = 2; break; case 2: // We're two characters into a four-character cyphertext block. // This sets the low four bits of the second plaintext // byte, and the high two bits of the third plaintext byte. // However, if this is the end of data, and those two // bits are zero, it could be that those two bits are // leftovers from the encoding of data that had a length // of two mod three. NSAssert((destIndex+1) < destLen, @"our calc for decoded length was wrong"); destBytes[destIndex] |= decode >> 2; destBytes[destIndex+1] = (decode & 0x03) << 6; destIndex++; state = 3; break; case 3: // We're at the last character of a four-character cyphertext block. // This sets the low six bits of the third plaintext byte. NSAssert(destIndex < destLen, @"our calc for decoded length was wrong"); destBytes[destIndex] |= decode; destIndex++; state = 0; break; } } // We are done decoding Base-64 chars. Let's see if we ended // on a byte boundary, and/or with erroneous trailing characters. if (ch == kBase64PaddingChar) { // We got a pad char if ((state == 0) || (state == 1)) { return 0; // Invalid '=' in first or second position } if (srcLen == 0) { if (state == 2) { // We run out of input but we still need another '=' return 0; } // Otherwise, we are in state 3 and only need this '=' } else { if (state == 2) { // need another '=' while ((ch = *srcBytes++) && (srcLen-- > 0)) { if (!IsSpace(ch)) break; } if (ch != kBase64PaddingChar) { return 0; } } // state = 1 or 2, check if all remain padding is space while ((ch = *srcBytes++) && (srcLen-- > 0)) { if (!IsSpace(ch)) { return 0; } } } } else { // We ended by seeing the end of the string. if (requirePadding) { // If we require padding, then anything but state 0 is an error. if (state != 0) { return 0; } } else { // Make sure we have no partial bytes lying around. Note that we do not // require trailing '=', so states 2 and 3 are okay too. if (state == 1) { return 0; } } } // If then next piece of output was valid and got written to it means we got a // very carefully crafted input that appeared valid but contains some trailing // bits past the real length, so just toss the thing. if ((destIndex < destLen) && (destBytes[destIndex] != 0)) { return 0; } return destIndex; }
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