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#define HMAC_IPAD 0x36
#define HMAC_OPAD 0x5c
#ifndef HAVE_ARC4RANDOM_UNIFORM
extern uint32_t arc4random_uniform(uint32_t);
#endif
@interface XMPPSCRAMAuth ()
- (OFString*)XMPP_genNonce;
- (uint8_t*)XMPP_HMACWithKey: (OFDataArray*)key
data: (OFDataArray*)data;
- (OFDataArray*)XMPP_hiWithData: (OFDataArray *)str
salt: (OFDataArray *)salt_
iterationCount: (intmax_t)i;
@end
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#define HMAC_IPAD 0x36
#define HMAC_OPAD 0x5c
#ifndef HAVE_ARC4RANDOM_UNIFORM
extern uint32_t arc4random_uniform(uint32_t);
#endif
@implementation XMPPSCRAMAuth
+ SCRAMAuthWithAuthcid: (OFString*)authcid
password: (OFString*)password
hash: (Class)hash;
{
return [[[self alloc] initWithAuthcid: authcid
password: password
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size_t i;
uint8_t *clientKey, *serverKey, *clientSignature;
intmax_t iterCount;
OFHash *hash;
OFDataArray *ret, *authMessage, *tmpArray, *salt, *saltedPassword;
OFString *tmpString, *sNonce;
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
enum {
GOT_SNONCE, GOT_SALT, GOT_ITERCOUNT
} got = 0;
hash = [[[hashType alloc] init] autorelease];
ret = [OFDataArray dataArrayWithItemSize: 1];
authMessage = [OFDataArray dataArrayWithItemSize: 1];
OFString *chal = [OFString stringWithCString: [challenge cArray]
length: [challenge count] *
[challenge itemSize]];
for (OFString *comp in [chal componentsSeparatedByString: @","]) {
OFString *entry = [comp substringFromIndex: 2
toIndex: [comp length]];
if ([comp hasPrefix: @"r="]) {
if (![entry hasPrefix: cNonce])
@throw [XMPPAuthFailedException
newWithClass: isa
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size_t i;
uint8_t *clientKey, *serverKey, *clientSignature;
intmax_t iterCount;
OFHash *hash;
OFDataArray *ret, *authMessage, *tmpArray, *salt, *saltedPassword;
OFString *tmpString, *sNonce;
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
OFEnumerator *enumerator;
OFString *comp;
enum {
GOT_SNONCE, GOT_SALT, GOT_ITERCOUNT
} got = 0;
hash = [[[hashType alloc] init] autorelease];
ret = [OFDataArray dataArrayWithItemSize: 1];
authMessage = [OFDataArray dataArrayWithItemSize: 1];
OFString *chal = [OFString stringWithCString: [challenge cArray]
length: [challenge count] *
[challenge itemSize]];
enumerator =
[[chal componentsSeparatedByString: @","] objectEnumerator];
while ((comp = [enumerator nextObject]) != nil) {
OFString *entry = [comp substringFromIndex: 2
toIndex: [comp length]];
if ([comp hasPrefix: @"r="]) {
if (![entry hasPrefix: cNonce])
@throw [XMPPAuthFailedException
newWithClass: isa
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{
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
OFDataArray *k = [OFDataArray dataArrayWithItemSize: 1];
size_t i, kSize, blockSize = [hashType blockSize];
uint8_t *kCArray, *kI = NULL, *kO = NULL;
OFHash *hash;
if (key.itemSize * key.count > blockSize) {
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [key cArray]
ofSize: key.itemSize * key.count];
[k addNItems: [hashType digestSize]
fromCArray: [hash digest]];
} else
[k addNItems: key.itemSize * key.count
fromCArray: [key cArray]];
@try {
kI = [self allocMemoryWithSize: blockSize * sizeof(uint8_t)];
memset(kI, HMAC_IPAD, blockSize * sizeof(uint8_t));
kO = [self allocMemoryWithSize: blockSize * sizeof(uint8_t)];
memset(kO, HMAC_OPAD, blockSize * sizeof(uint8_t));
kCArray = [k cArray];
kSize = k.count;
for (i = 0; i < kSize; i++) {
kI[i] ^= kCArray[i];
kO[i] ^= kCArray[i];
}
k = [OFDataArray dataArrayWithItemSize: 1];
[k addNItems: blockSize
fromCArray: kI];
[k addNItems: data.itemSize * data.count
fromCArray: [data cArray]];
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [k cArray]
ofSize: k.count];
k = [OFDataArray dataArrayWithItemSize: 1];
[k addNItems: blockSize
fromCArray: kO];
[k addNItems: [hashType digestSize]
fromCArray: [hash digest]];
} @finally {
[self freeMemory: kI];
[self freeMemory: kO];
}
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [k cArray]
ofSize: k.count];
[hash retain];
[pool release];
return [hash digest];
}
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{
OFAutoreleasePool *pool = [[OFAutoreleasePool alloc] init];
OFDataArray *k = [OFDataArray dataArrayWithItemSize: 1];
size_t i, kSize, blockSize = [hashType blockSize];
uint8_t *kCArray, *kI = NULL, *kO = NULL;
OFHash *hash;
if ([key itemSize] * [key count] > blockSize) {
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [key cArray]
ofSize: [key itemSize] * [key count]];
[k addNItems: [hashType digestSize]
fromCArray: [hash digest]];
} else
[k addNItems: [key itemSize] * [key count]
fromCArray: [key cArray]];
@try {
kI = [self allocMemoryWithSize: blockSize * sizeof(uint8_t)];
memset(kI, HMAC_IPAD, blockSize * sizeof(uint8_t));
kO = [self allocMemoryWithSize: blockSize * sizeof(uint8_t)];
memset(kO, HMAC_OPAD, blockSize * sizeof(uint8_t));
kCArray = [k cArray];
kSize = [k count];
for (i = 0; i < kSize; i++) {
kI[i] ^= kCArray[i];
kO[i] ^= kCArray[i];
}
k = [OFDataArray dataArrayWithItemSize: 1];
[k addNItems: blockSize
fromCArray: kI];
[k addNItems: [data itemSize] * [data count]
fromCArray: [data cArray]];
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [k cArray]
ofSize: [k count]];
k = [OFDataArray dataArrayWithItemSize: 1];
[k addNItems: blockSize
fromCArray: kO];
[k addNItems: [hashType digestSize]
fromCArray: [hash digest]];
} @finally {
[self freeMemory: kI];
[self freeMemory: kO];
}
hash = [[[hashType alloc] init] autorelease];
[hash updateWithBuffer: [k cArray]
ofSize: [k count]];
[hash retain];
[pool release];
return [hash digest];
}
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