/
NSData+Crypto.m
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NSData+Crypto.m
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/* NSData+Crypto.m - this file is part of SOGo
*
* Copyright (C) 2012, 2020 Nicolas Höft
* Copyright (C) 2012-2020 Inverse inc.
* Copyright (C) 2012 Jeroen Dekkers
*
* Author: Nicolas Höft
* Inverse inc.
*
* This file is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This file is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#define _XOPEN_SOURCE 600
#include <fcntl.h>
#include <unistd.h>
#if !defined(__OpenBSD__) && !defined(__FreeBSD__)
#include <crypt.h>
#endif
#if defined(HAVE_GNUTLS)
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#include "md4.h"
#define MD4_DIGEST_LENGTH 16
#define MD5_DIGEST_LENGTH 16
#define SHA_DIGEST_LENGTH 20
#define SHA256_DIGEST_LENGTH 32
#define SHA512_DIGEST_LENGTH 64
#elif defined(HAVE_OPENSSL)
#include <openssl/evp.h>
#include <openssl/md4.h>
#include <openssl/md5.h>
#include <openssl/sha.h>
#else
#error this module requires either gnutls or openssl
#endif
#include "aes.h"
#include "crypt_blowfish.h"
#include "lmhash.h"
#import <Foundation/NSArray.h>
#import <NGExtensions/NGBase64Coding.h>
#import "NSData+Crypto.h"
static unsigned charTo4Bits(char c);
#if defined(HAVE_GNUTLS)
static BOOL check_gnutls_init(void);
static void _nettle_md5_compress(uint32_t *digest, const uint8_t *input);
#endif
#define BLF_CRYPT_DEFAULT_COMPLEXITY (5)
#define BLF_CRYPT_SALT_LEN (16)
#define BLF_CRYPT_BUFFER_LEN (128)
#define BLF_CRYPT_PREFIX_LEN (7+22+1) /* $2.$nn$ + salt */
#define BLF_CRYPT_PREFIX "$2y"
static const char salt_chars[] =
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
@implementation NSData (SOGoCryptoExtension)
/**
* Covert binary data to hex encoded data (lower-case).
*
* @param theData The NSData to be converted into a hex-encoded string.
* @return Hex-Encoded data
*/
+ (NSString *) encodeDataAsHexString: (NSData *) theData
{
unsigned int byteLength = [theData length], byteCounter = 0;
unsigned int stringLength = (byteLength * 2) + 1, stringCounter = 0;
unsigned char dstBuffer[stringLength];
unsigned char srcBuffer[byteLength];
unsigned char *srcPtr = srcBuffer;
[theData getBytes: srcBuffer];
const unsigned char t[16] = "0123456789abcdef";
for (; byteCounter < byteLength; byteCounter++)
{
unsigned src = *srcPtr;
dstBuffer[stringCounter++] = t[src >> 4];
dstBuffer[stringCounter++] = t[src & 15];
srcPtr++;
}
dstBuffer[stringCounter] = '\0';
return [NSString stringWithUTF8String: (char*)dstBuffer];
}
/**
* Covert hex-encoded data to binary data.
*
* @param theString The hex-encoded string to be converted into binary data (works both for upper and lowe case characters)
* @return binary data or nil if unsuccessful
*/
+ (NSData *) decodeDataFromHexString: (NSString *) theString
{
unsigned int stringLength = [theString length];
unsigned int byteLength = stringLength/2;
unsigned int byteCounter = 0;
unsigned char srcBuffer[stringLength];
[theString getCString:(char *)srcBuffer];
unsigned char *srcPtr = srcBuffer;
unsigned char dstBuffer[byteLength];
unsigned char *dst = dstBuffer;
while (byteCounter < byteLength)
{
unsigned char c = *srcPtr++;
unsigned char d = *srcPtr++;
unsigned hi = 0, lo = 0;
hi = charTo4Bits(c);
lo = charTo4Bits(d);
if (hi == 255 || lo == 255)
{
//errorCase
return nil;
}
dstBuffer[byteCounter++] = ((hi << 4) | lo);
}
return [NSData dataWithBytes: dst length: byteLength];
}
/**
* Generate a binary key which can be used for salting hashes.
*
* @param theLength length of the binary data to be generated in bytes
* @return Pseudo-random binary data with length theLength or nil, if an error occured
*/
+ (NSData *) generateSaltForLength: (unsigned int) theLength
{
return [NSData generateSaltForLength: theLength withPrintable: NO];
}
/**
* Generate a binary key which can be used for salting hashes. When using
* with doBase64 == YES then the data will be longer than theLength
*
* @param theLength Length of the binary data to be generated in bytes
* @param doPrintable Use only printable characters
* @return Pseudo-random binary data with length theLength or nil, if an error occured
*/
+ (NSData *) generateSaltForLength: (unsigned int) theLength
withPrintable: (BOOL) doPrintable
{
char *buf;
int fd;
NSData *data;
unsigned int i;
fd = open("/dev/urandom", O_RDONLY);
if (fd > 0)
{
buf = (char *)malloc(theLength);
read(fd, buf, theLength);
close(fd);
if (doPrintable == YES)
{
for (i = 0; i < theLength; i++)
{
buf[i] = salt_chars[buf[i] % (sizeof(salt_chars)-1)];
}
}
data = [NSData dataWithBytesNoCopy: buf length: theLength freeWhenDone: YES];
return data;
}
return nil;
}
/**
* Encrypt/Hash the data with a given scheme
*
* @param passwordScheme The scheme to use for hashing/encryption.
* @param theSalt The salt to be used. If none is given but needed, it will be generated
* @return Binary data from the encryption by the specified scheme. On error the function returns nil.
*/
- (NSData *) asCryptedPassUsingScheme: (NSString *) passwordScheme
withSalt: (NSData *) theSalt
keyPath: (NSString *) theKeyPath
{
if ([passwordScheme caseInsensitiveCompare: @"none"] == NSOrderedSame ||
[passwordScheme caseInsensitiveCompare: @"plain"] == NSOrderedSame ||
[passwordScheme caseInsensitiveCompare: @"cleartext"] == NSOrderedSame)
{
return self;
}
else if ([passwordScheme caseInsensitiveCompare: @"crypt"] == NSOrderedSame)
{
return [self asCryptUsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"md5-crypt"] == NSOrderedSame)
{
return [self asMD5CryptUsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"md4"] == NSOrderedSame)
{
return [self asMD4];
}
else if ([passwordScheme caseInsensitiveCompare: @"md5"] == NSOrderedSame ||
[passwordScheme caseInsensitiveCompare: @"plain-md5"] == NSOrderedSame ||
[passwordScheme caseInsensitiveCompare: @"ldap-md5"] == NSOrderedSame)
{
return [self asMD5];
}
else if ([passwordScheme caseInsensitiveCompare: @"cram-md5"] == NSOrderedSame)
{
return [self asCramMD5];
}
else if ([passwordScheme caseInsensitiveCompare: @"smd5"] == NSOrderedSame)
{
return [self asSMD5UsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"sha"] == NSOrderedSame)
{
return [self asSHA1];
}
else if ([passwordScheme caseInsensitiveCompare: @"ssha"] == NSOrderedSame)
{
return [self asSSHAUsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"sha256"] == NSOrderedSame)
{
return [self asSHA256];
}
else if ([passwordScheme caseInsensitiveCompare: @"ssha256"] == NSOrderedSame)
{
return [self asSSHA256UsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"sha512"] == NSOrderedSame)
{
return [self asSHA512];
}
else if ([passwordScheme caseInsensitiveCompare: @"ssha512"] == NSOrderedSame)
{
return [self asSSHA512UsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"sha256-crypt"] == NSOrderedSame)
{
return [self asSHA256CryptUsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"sha512-crypt"] == NSOrderedSame)
{
return [self asSHA512CryptUsingSalt: theSalt];
}
else if ([passwordScheme caseInsensitiveCompare: @"blf-crypt"] == NSOrderedSame)
{
return [self asBlowfishCryptUsingSalt: theSalt];
}
else if ([[passwordScheme lowercaseString] hasPrefix: @"sym"])
{
// We first support one sym cipher, AES-128-CBC. If something else is provided
// we return nil for now. Example of what theSalt might contain:
// $AES-128-CBC$cinlbHKnyBApySphVCz6yA==$Z9hjCXfMhz4xbXkW+aMkAw==
// If theSalt is empty, that means we are not validating a password
// but rather changing it. In this case, we generate an IV.
NSString *cipher, *iv;
cipher = nil;
iv = nil;
if ([theSalt length])
{
NSString *s;
NSArray *a;
s = [[NSString alloc] initWithData: theSalt encoding: NSUTF8StringEncoding];
[s autorelease];
a = [s componentsSeparatedByString: @"$"];
cipher = [a objectAtIndex: 1];
iv = [a objectAtIndex: 2];
}
else
{
if ([passwordScheme caseInsensitiveCompare: @"sym-aes-128-cbc"] == NSOrderedSame)
cipher = @"AES-128-CBC";
}
if ([cipher caseInsensitiveCompare: @"AES-128-CBC"] == NSOrderedSame)
return [self asSymAES128CBCUsingIV: iv
keyPath: theKeyPath];
}
// in case the scheme was not detected, return nil
return nil;
}
/**
* Verify the given password data is equivalent with the
* clear text password using the passed encryption scheme
*
* @param passwordScheme The password scheme to use for comparison
* @param thePassword
*/
- (BOOL) verifyUsingScheme: (NSString *) passwordScheme
withPassword: (NSData *) thePassword
keyPath: (NSString *) theKeyPath
{
NSData *passwordCrypted;
NSData *salt;
salt = [self extractSalt: passwordScheme];
if (salt == nil)
return NO;
// encrypt self with the salt an compare the results
passwordCrypted = [thePassword asCryptedPassUsingScheme: passwordScheme
withSalt: salt
keyPath: theKeyPath];
// return always false when there was a problem
if (passwordCrypted == nil)
return NO;
return [self isEqual: passwordCrypted];
}
- (NSData *) asLM
{
NSData *out;
unsigned char buf[14];
unsigned char *o;
unsigned int len;
memset(buf, 0, 14);
len = ([self length] >= 14 ? 14 : [self length]);
[self getBytes: buf length: len];
o = malloc(16*sizeof(unsigned char));
auth_LMhash(o, buf, len);
out = [NSData dataWithBytes: o length: 16];
free(o);
return out;
}
/**
* Hash the data with MD4. Uses openssl functions to generate it.
*
* @return Binary data from MD4 hashing. On error the funciton returns nil.
*/
- (NSData *) asMD4
{
unsigned char md4[MD4_DIGEST_LENGTH];
memset(md4, 0, MD4_DIGEST_LENGTH);
#if defined(HAVE_GNUTLS)
if (!check_gnutls_init())
return nil;
md4_buffer([self bytes], [self length], md4);
#elif defined(HAVE_OPENSSL)
MD4([self bytes], [self length], md4);
#endif
return [NSData dataWithBytes: md4 length: MD4_DIGEST_LENGTH];
}
/**
* Hash the data with MD5. Uses openssl functions to generate it
*
* @return Binary data from MD5 hashing. On error the funciton returns nil.
*/
- (NSData *) asMD5
{
unsigned char md5[MD5_DIGEST_LENGTH];
memset(md5, 0, MD5_DIGEST_LENGTH);
#if defined(HAVE_GNUTLS)
if (!check_gnutls_init())
return nil;
gnutls_hash_fast (GNUTLS_DIG_MD5, [self bytes], [self length], md5);
#elif defined(HAVE_OPENSSL)
MD5([self bytes], [self length], md5);
#endif
return [NSData dataWithBytes: md5 length: MD5_DIGEST_LENGTH];
}
/**
* Hash the data with CRAM-MD5. Uses openssl functions to generate it.
*
* Note that the actual CRAM-MD5 algorithm also needs a challenge
* but this is not provided, this function actually calculalates
* only the context data which can be used for the challange-response
* algorithm then. This is just the underlying algorithm to store the passwords.
*
* The code is adopts the dovecot behaviour of storing the passwords
*
* @return Binary data from CRAM-MD5 'hashing'. On error the funciton returns nil.
*/
- (NSData *) asCramMD5
{
#if defined(HAVE_GNUTLS)
const uint32_t init_digest[4] = {0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476};
uint32_t digest[4];
#elif defined(HAVE_OPENSSL)
MD5_CTX ctx;
#endif
unsigned char inner[64];
unsigned char outer[64];
unsigned char result[32];
unsigned char *r;
int i;
int len;
NSData *key;
if ([self length] > 64)
{
key = [self asMD5];
}
else
{
key = self;
}
len = [key length];
// fill with both inner and outer with key
memcpy(inner, [key bytes], len);
// make sure the rest of the bytes is zero
memset(inner + len, 0, 64 - len);
memcpy(outer, inner, 64);
for (i = 0; i < 64; i++)
{
inner[i] ^= 0x36;
outer[i] ^= 0x5c;
}
// this transformation is needed for the correct cast to binary data
#define CDPUT(p, c) { \
*p = (c) & 0xff; p++; \
*p = (c) >> 8 & 0xff; p++; \
*p = (c) >> 16 & 0xff; p++; \
*p = (c) >> 24 & 0xff; p++; \
}
#if defined(HAVE_GNUTLS)
// generate first set of context bytes from outer data
memcpy(digest, init_digest, sizeof(digest));
_nettle_md5_compress(digest, outer);
r = result;
// convert this to correct binary data according to RFC 1321
CDPUT(r, digest[0]);
CDPUT(r, digest[1]);
CDPUT(r, digest[2]);
CDPUT(r, digest[3]);
// second set with inner data is appended to result string
memcpy(digest, init_digest, sizeof(digest));
_nettle_md5_compress(digest, inner);
// convert this to correct binary data
CDPUT(r, digest[0]);
CDPUT(r, digest[1]);
CDPUT(r, digest[2]);
CDPUT(r, digest[3]);
#elif defined(HAVE_OPENSSL)
// generate first set of context bytes from outer data
MD5_Init(&ctx);
MD5_Transform(&ctx, outer);
r = result;
// convert this to correct binary data according to RFC 1321
CDPUT(r, ctx.A);
CDPUT(r, ctx.B);
CDPUT(r, ctx.C);
CDPUT(r, ctx.D);
// second set with inner data is appended to result string
MD5_Init(&ctx);
MD5_Transform(&ctx, inner);
// convert this to correct binary data
CDPUT(r, ctx.A);
CDPUT(r, ctx.B);
CDPUT(r, ctx.C);
CDPUT(r, ctx.D);
#endif
return [NSData dataWithBytes: result length: 32];
}
/**
* Hash the data with SHA1. Uses openssl functions to generate it.
*
* @return Binary data from SHA1 hashing. On error the funciton returns nil.
*/
- (NSData *) asSHA1
{
unsigned char sha[SHA_DIGEST_LENGTH];
memset(sha, 0, SHA_DIGEST_LENGTH);
#if defined(HAVE_GNUTLS)
if (!check_gnutls_init())
return nil;
gnutls_hash_fast (GNUTLS_DIG_SHA1, [self bytes], [self length], sha);
#elif defined(HAVE_OPENSSL)
SHA1([self bytes], [self length], sha);
#endif
return [NSData dataWithBytes: sha length: SHA_DIGEST_LENGTH];
}
/**
* Hash the data with SHA256. Uses openssl functions to generate it.
*
* @return Binary data from SHA256 hashing. On error the funciton returns nil.
*/
- (NSData *) asSHA256
{
unsigned char sha[SHA256_DIGEST_LENGTH];
memset(sha, 0, SHA256_DIGEST_LENGTH);
#if defined(HAVE_GNUTLS)
if (!check_gnutls_init())
return nil;
gnutls_hash_fast (GNUTLS_DIG_SHA256, [self bytes], [self length], sha);
#elif defined(HAVE_OPENSSL)
SHA256([self bytes], [self length], sha);
#endif
return [NSData dataWithBytes: sha length: SHA256_DIGEST_LENGTH];
}
/**
* Hash the data with SHA512. Uses openssl functions to generate it.
*
* @return Binary data from SHA512 hashing. On error the funciton returns nil.
*/
- (NSData *) asSHA512
{
unsigned char sha[SHA512_DIGEST_LENGTH];
memset(sha, 0, SHA512_DIGEST_LENGTH);
#if defined(HAVE_GNUTLS)
if (!check_gnutls_init())
return nil;
gnutls_hash_fast (GNUTLS_DIG_SHA512, [self bytes], [self length], sha);
#elif defined(HAVE_OPENSSL)
SHA512([self bytes], [self length], sha);
#endif
return [NSData dataWithBytes: sha length: SHA512_DIGEST_LENGTH];
}
- (NSData *) asSymAES128CBCUsingIV: (NSString *) theIV
keyPath: (NSString *) theKeyPath
{
NSData *iv_d, *key_d, *cipherdata;
NSMutableString *result;
NSString *s;
char ciphertext[256], *iv_s, *key_s, *pass;
unsigned int len;
len = ceil((double)[self length]/16) * 16;
if (theIV)
iv_d = [theIV dataByDecodingBase64];
else
{
iv_d = [NSData generateSaltForLength: len];
theIV = [iv_d stringByEncodingBase64];
}
iv_s = calloc([iv_d length]+1, sizeof(char));
strncpy(iv_s, [iv_d bytes], [iv_d length]);
key_d = [NSData dataWithContentsOfFile: theKeyPath];
key_s = calloc([key_d length]+1, sizeof(char));
strncpy(key_s, [key_d bytes], [key_d length]);
pass = calloc(len, sizeof(char));
strncpy(pass, [self bytes], [self length]);
AES128_CBC_encrypt_buffer((uint8_t*)ciphertext, (uint8_t*)pass, (uint32_t)len, (const uint8_t*)key_s, (const uint8_t*)iv_s);
cipherdata = [NSData dataWithBytes: ciphertext length: 16];
s = [[NSString alloc] initWithData: [cipherdata dataByEncodingBase64WithLineLength: 1024]
encoding: NSASCIIStringEncoding];
result = [NSMutableString string];
[result appendFormat: @"$AES-128-CBC$%@$%@", theIV, s];
RELEASE(s);
return [result dataUsingEncoding: NSUTF8StringEncoding];
}
/**
* Hash the data with SSHA. Uses openssl functions to generate it.
*
* SSHA works following: SSHA(pass, salt) = SHA1(pass + salt) + saltData
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
* @return Binary data from SHA1 hashing. On error the funciton returns nil.
*/
- (NSData *) asSSHAUsingSalt: (NSData *) theSalt
{
//
NSMutableData *sshaData;
// generate salt, if not available
if ([theSalt length] == 0)
theSalt = [NSData generateSaltForLength: 8];
// put the pass and salt together as one data array
sshaData = [NSMutableData dataWithData: self];
[sshaData appendData: theSalt];
// generate SHA1 from pass + salt
sshaData = [NSMutableData dataWithData: [sshaData asSHA1]];
// append salt again
[sshaData appendData: theSalt];
return sshaData;
}
/**
* Hash the data with SSHA256. Uses openssl functions to generate it.
*
* SSHA256 works following: SSHA256(pass, salt) = SHA256(pass + salt) + saltData
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
* @return Binary data from SHA1 hashing. On error the funciton returns nil.
*/
- (NSData *) asSSHA256UsingSalt: (NSData *) theSalt
{
NSMutableData *sshaData;
// generate salt, if not available
if ([theSalt length] == 0)
theSalt = [NSData generateSaltForLength: 8];
// put the pass and salt together as one data array
sshaData = [NSMutableData dataWithData: self];
[sshaData appendData: theSalt];
// generate SHA1 from pass + salt
sshaData = [NSMutableData dataWithData: [sshaData asSHA256]];
// append salt again
[sshaData appendData: theSalt];
return sshaData;
}
/**
* Hash the data with SSHA512. Uses openssl functions to generate it.
*
* SSHA works following: SSHA512(pass, salt) = SHA512(pass + salt) + saltData
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
* @return Binary data from SHA512 hashing. On error the funciton returns nil.
*/
- (NSData *) asSSHA512UsingSalt: (NSData *) theSalt
{
NSMutableData *sshaData;
// generate salt, if not available
if ([theSalt length] == 0)
theSalt = [NSData generateSaltForLength: 8];
// put the pass and salt together as one data array
sshaData = [NSMutableData dataWithData: self];
[sshaData appendData: theSalt];
// generate SHA1 from pass + salt
sshaData = [NSMutableData dataWithData: [sshaData asSHA512]];
// append salt again
[sshaData appendData: theSalt];
return sshaData;
}
/**
* Hash the data with SMD5. Uses openssl functions to generate it.
*
* SMD5 works following: SMD5(pass, salt) = MD5(pass + salt) + saltData
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
* @return Binary data from SMD5 hashing. On error the funciton returns nil.
*/
- (NSData *) asSMD5UsingSalt: (NSData *) theSalt
{
// SMD5 works following: SMD5(pass, salt) = MD5(pass + salt) + salt
NSMutableData *smdData;
// generate salt, if not available
if ([theSalt length] == 0)
theSalt = [NSData generateSaltForLength: 8];
// put the pass and salt together as one data array
smdData = [NSMutableData dataWithData: self];
[smdData appendData: theSalt];
// generate SHA1 from pass + salt
smdData = [NSMutableData dataWithData: [smdData asMD5]];
// append salt again
[smdData appendData: theSalt];
return smdData;
}
//
// Internal hashing function using glibc's crypt() one.
// Glibc 2.6 supports magic == 5 and 6
//
- (NSData *) _asCryptedUsingSalt: (NSData *) theSalt
magic: (NSString *) magic
{
NSString *cryptString, *saltString;
NSMutableData *saltData;
char *buf;
if ([theSalt length] == 0)
{
// make sure these characters are all printable
theSalt = [NSData generateSaltForLength: 8 withPrintable: YES];
}
cryptString = [[NSString alloc] initWithData: self encoding: NSUTF8StringEncoding];
saltData = [NSMutableData dataWithData: [[NSString stringWithFormat:@"$%@$", magic] dataUsingEncoding: NSUTF8StringEncoding]];
[saltData appendData: theSalt];
// Terminate with "$"
[saltData appendData: [@"$" dataUsingEncoding: NSUTF8StringEncoding]];
saltString = [[NSString alloc] initWithData: saltData encoding: NSUTF8StringEncoding];
buf = crypt([cryptString UTF8String], [saltString UTF8String]);
[cryptString release];
[saltString release];
if (!buf)
return nil;
return [NSData dataWithBytes: buf length: strlen(buf)];
}
/**
* Hash the data with CRYPT-MD5 as used in /etc/passwd nowadays. Uses crypt() function to generate it.
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated. It must be printable characters only.
* @return Binary data from CRYPT-MD5 hashing. On error the funciton returns nil.
*/
- (NSData *) asMD5CryptUsingSalt: (NSData *) theSalt
{
return [self _asCryptedUsingSalt: theSalt magic: @"1"];
}
/**
* Hash the data with CRYPT-SHA256 as used in /etc/passwd nowadays. Uses crypt() function to generate it.
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated. It must be printable characters only.
* @return Binary data from CRYPT-SHA256 hashing. On error the funciton returns nil.
*/
- (NSData *) asSHA256CryptUsingSalt: (NSData *) theSalt
{
return [self _asCryptedUsingSalt: theSalt magic: @"5"];
}
/**
* Hash the data with CRYPT-SHA512 as used in /etc/passwd nowadays. Uses crypt() function to generate it.
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated. It must be printable characters only.
* @return Binary data from CRYPT-SHA512 hashing. On error the funciton returns nil.
*/
- (NSData *) asSHA512CryptUsingSalt: (NSData *) theSalt
{
return [self _asCryptedUsingSalt: theSalt magic: @"6"];
}
/**
* Hash the data using crypt() function.
*
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
* @return Binary data from CRYPT-MD5 hashing. On error the funciton returns nil.
*/
- (NSData *) asCryptUsingSalt: (NSData *) theSalt
{
char *buf;
NSString *saltString;
NSString *cryptString;
// crypt() works with strings, so convert NSData to strings
cryptString = [[NSString alloc] initWithData: self encoding: NSUTF8StringEncoding];
if ([theSalt length] == 0)
theSalt = [NSData generateSaltForLength: 8 withPrintable: YES];
saltString = [[NSString alloc] initWithData: theSalt encoding: NSUTF8StringEncoding];
// The salt is weak here, but who cares anyway, crypt should not
// be used anymore
buf = crypt([cryptString UTF8String], [saltString UTF8String]);
[saltString release];
[cryptString release];
if (!buf)
return nil;
return [NSData dataWithBytes: buf length: strlen(buf)];
}
/**
* Hash the data using blowfish-crypt
* @param theSalt The salt to be used must not be nil, if empty, one will be generated
*/
- (NSData *) asBlowfishCryptUsingSalt: (NSData *) theSalt
{
NSString *cleartext;
char hashed_password[BLF_CRYPT_BUFFER_LEN];
char magic_salt[BLF_CRYPT_PREFIX_LEN]; // contains $2.$nn$ + salt
if ([theSalt length] == 0)
{
// generate a salt with default complexity if none was provided
NSData* salt = [NSData generateSaltForLength: BLF_CRYPT_SALT_LEN];
if (_crypt_gensalt_blowfish_rn(BLF_CRYPT_PREFIX, BLF_CRYPT_DEFAULT_COMPLEXITY,
[salt bytes], BLF_CRYPT_SALT_LEN,
magic_salt, BLF_CRYPT_PREFIX_LEN) == NULL)
return nil;
}
else
{
const char* salt = [theSalt bytes];
if ([theSalt length] < BLF_CRYPT_PREFIX_LEN ||
salt[0] != '$' || salt[1] != '2' ||
salt[2] < 'a' || salt[2] > 'z' ||
salt[3] != '$')
{
return nil;
}
memcpy(magic_salt, salt, BLF_CRYPT_PREFIX_LEN);
}
cleartext = [[NSString alloc] initWithData: self encoding: NSUTF8StringEncoding];
const char* password = [cleartext UTF8String];
char* bf_res = _crypt_blowfish_rn(password, magic_salt,
hashed_password, BLF_CRYPT_BUFFER_LEN);
[cleartext autorelease];
if (bf_res == NULL)
return nil;
return [NSData dataWithBytes: hashed_password length: strlen(hashed_password)];
}
/**
* Get the salt from a password encrypted with a specied scheme
*
* @param theScheme Needed to get the salt correctly out of the pass
* @return The salt, if one was available in the password/scheme, else empty data
*/
- (NSData *) extractSalt: (NSString *) theScheme
{
NSRange r;
int len;
len = [self length];
if (len == 0)
return [NSData data];
// for the ssha schemes the salt is appended at the endif
// so the range with the salt are bytes after each digest length
if ([theScheme caseInsensitiveCompare: @"crypt"] == NSOrderedSame ||
[theScheme caseInsensitiveCompare: @"blf-crypt"] == NSOrderedSame)
{
// for (blf-)crypt schemes simply use the whole string
// the crypt() function is able to extract it by itself
r = NSMakeRange(0, len);
}
else if ([theScheme caseInsensitiveCompare: @"md5-crypt"] == NSOrderedSame ||
[theScheme caseInsensitiveCompare: @"sha256-crypt"] == NSOrderedSame ||
[theScheme caseInsensitiveCompare: @"sha512-crypt"] == NSOrderedSame)
{
// md5-crypt is generated the following "$1$<salt>$<encrypted pass>"
// sha256-crypt is generated the following "$5$<salt>$<encrypted pass>"
// sha512-crypt is generated the following "$6$<salt>$<encrypted pass>"
NSString *cryptString;
NSArray *cryptParts;
cryptString = [[NSString alloc] initWithData: self encoding: NSUTF8StringEncoding];
AUTORELEASE(cryptString);
cryptParts = [cryptString componentsSeparatedByString: @"$"];
// correct number of elements (first one is an empty string)
if ([cryptParts count] < 4)
{
return [NSData data];
}
// second is the identifier of md5-crypt/sha256-crypt or sha512-crypt
else if ([[cryptParts objectAtIndex: 1] caseInsensitiveCompare: @"1"] == NSOrderedSame ||
[[cryptParts objectAtIndex: 1] caseInsensitiveCompare: @"5"] == NSOrderedSame ||
[[cryptParts objectAtIndex: 1] caseInsensitiveCompare: @"6"] == NSOrderedSame)
{
// third is the salt; convert it to NSData
if ([cryptParts count] == 4)
return [[cryptParts objectAtIndex: 2] dataUsingEncoding: NSUTF8StringEncoding];
else
{
NSString *saltWithRounds;
saltWithRounds = [NSString stringWithFormat: @"%@$%@", [cryptParts objectAtIndex: 2], [cryptParts objectAtIndex: 3]];
return [saltWithRounds dataUsingEncoding: NSUTF8StringEncoding];
}
}
// nothing good
return [NSData data];
}
else if ([theScheme caseInsensitiveCompare: @"ssha"] == NSOrderedSame)
{
r = NSMakeRange(SHA_DIGEST_LENGTH, len - SHA_DIGEST_LENGTH);
}
else if ([theScheme caseInsensitiveCompare: @"ssha256"] == NSOrderedSame)
{
r = NSMakeRange(SHA256_DIGEST_LENGTH, len - SHA256_DIGEST_LENGTH);
}
else if ([theScheme caseInsensitiveCompare: @"ssha512"] == NSOrderedSame)
{
r = NSMakeRange(SHA512_DIGEST_LENGTH, len - SHA512_DIGEST_LENGTH);
}
else if ([theScheme caseInsensitiveCompare: @"smd5"] == NSOrderedSame)
{
r = NSMakeRange(MD5_DIGEST_LENGTH, len - MD5_DIGEST_LENGTH);
}
else if ([[theScheme lowercaseString] hasPrefix: @"sym"])
{
// For sym we return everything
r = NSMakeRange(0, len);
}
else
{
// return empty string on unknown scheme
return [NSData data];
}
return [self subdataWithRange: r];
}
@end
static unsigned charTo4Bits(char c)
{
unsigned bits = 0;
if (c > '/' && c < ':')
{
bits = c - '0';
}
else if (c > '@' && c < 'G')
{
bits = (c- 'A') + 10;
}
else if (c > '`' && c < 'g')
{
bits = (c- 'a') + 10;
}
else
{
bits = 255;
}
return bits;
}
#if defined(HAVE_GNUTLS)
static BOOL didGlobalInit = NO;
static BOOL check_gnutls_init(void) {
if (!didGlobalInit) {
/* Global system initialization*/
if (gnutls_global_init()) {
return NO;
}
didGlobalInit = YES;
}
return YES;
}
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001, 2005 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*