Overview
Comment: | OFHMAC: Allow resetting while keeping the key |
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Downloads: | Tarball | ZIP archive | SQL archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
c55c5dff513e04dc8f896cfed3af470e |
User & Date: | js on 2016-07-24 20:51:18 |
Other Links: | manifest | tags |
Context
2016-07-25
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22:30 | Implement PBKDF2 check-in: 49d1987eaf user: js tags: trunk | |
2016-07-24
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20:51 | OFHMAC: Allow resetting while keeping the key check-in: c55c5dff51 user: js tags: trunk | |
20:05 | OF*Hash: Call [self reset] in -[dealloc] check-in: 096dd743b5 user: js tags: trunk | |
Changes
Modified src/OFHMAC.h from [682e9b5139] to [fe33092934].
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22 23 24 25 26 27 28 29 | /*! * @class OFHMAC OFHMAC.h ObjFW/OFHMAC.h * * @brief A class which provides methods to calculate an HMAC. */ @interface OFHMAC: OFObject { id <OFCryptoHash> _outerHash, _innerHash; | > > | > > > | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | /*! * @class OFHMAC OFHMAC.h ObjFW/OFHMAC.h * * @brief A class which provides methods to calculate an HMAC. */ @interface OFHMAC: OFObject { Class <OFCryptoHash> _hashClass; id <OFCryptoHash> _outerHash, _innerHash; id <OFCryptoHash> _outerHashCopy, _innerHashCopy; bool _calculated; } /*! The class for the cryptographic hash used by the HMAC. */ @property (assign, readonly) Class <OFCryptoHash> hashClass; /*! * @brief Returns a new OFHMAC with the specified hashing algorithm. * * @param class The class of the hashing algorithm * @return A new, autoreleased OFHMAC */ |
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46 47 48 49 50 51 52 53 54 55 56 57 58 59 | * @return An initialized OFHMAC */ - initWithHashClass: (Class <OFCryptoHash>)class; /*! * @brief Sets the key for the HMAC. * * @param key The key for the HMAC * @param length The length of the key for the HMAC */ - (void)setKey: (const void*)key length: (size_t)length; /*! | > > > > > > | 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | * @return An initialized OFHMAC */ - initWithHashClass: (Class <OFCryptoHash>)class; /*! * @brief Sets the key for the HMAC. * * @note This resets the HMAC! * * @warning This invalidates any pointer previously returned by @ref digest. If * you are still interested in the previous digest, you need to memcpy * it yourself before calling @ref setKey:length:! * * @param key The key for the HMAC * @param length The length of the key for the HMAC */ - (void)setKey: (const void*)key length: (size_t)length; /*! |
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79 80 81 82 83 84 85 | * @brief Returns the size of the digest. * * @return The size of the digest. */ - (size_t)digestSize; /*! | | > > > > | 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 | * @brief Returns the size of the digest. * * @return The size of the digest. */ - (size_t)digestSize; /*! * @brief Resets the HMAC so that it can be calculated for a new message. * * @note This does not reset the key so that a new HMAC with the same key can * be calculated efficiently. If you want to reset both, use * @ref setKey:length:. * * @warning This invalidates any pointer previously returned by @ref digest. If * you are still interested in the previous digest, you need to memcpy * it yourself before calling @ref reset! */ - (void)reset; @end OF_ASSUME_NONNULL_END |
Modified src/OFHMAC.m from [9c331f3be4] to [8de8a11875].
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16 17 18 19 20 21 22 23 24 25 26 27 | #import "OFHMAC.h" #import "OFHashAlreadyCalculatedException.h" #import "OFInvalidArgumentException.h" @implementation OFHMAC + (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)class { return [[[self alloc] initWithHashClass: class] autorelease]; } | > > | < < | < < < < < < < < > > > | > > > > > > < | | < < > > > > | > > > > | > > > | | | | > > > | | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 | #import "OFHMAC.h" #import "OFHashAlreadyCalculatedException.h" #import "OFInvalidArgumentException.h" @implementation OFHMAC @synthesize hashClass = _hashClass; + (instancetype)HMACWithHashClass: (Class <OFCryptoHash>)class { return [[[self alloc] initWithHashClass: class] autorelease]; } - initWithHashClass: (Class <OFCryptoHash>)class { self = [super init]; _hashClass = class; return self; } - (void)dealloc { [_outerHash release]; [_innerHash release]; [_outerHashCopy release]; [_innerHashCopy release]; [super dealloc]; } - (void)setKey: (const void*)key length: (size_t)length { void *pool = objc_autoreleasePoolPush(); size_t blockSize = [_hashClass blockSize]; uint8_t outerKeyPad[blockSize], innerKeyPad[blockSize]; [_outerHash release]; [_innerHash release]; [_outerHashCopy release]; [_innerHashCopy release]; _outerHash = _innerHash = _outerHashCopy = _innerHashCopy = nil; if (length > blockSize) { id <OFCryptoHash> hash = [_hashClass cryptoHash]; [hash updateWithBuffer: key length: length]; length = [_hashClass digestSize]; if OF_UNLIKELY (length > blockSize) length = blockSize; memcpy(outerKeyPad, [hash digest], length); memcpy(innerKeyPad, [hash digest], length); } else { memcpy(outerKeyPad, key, length); memcpy(innerKeyPad, key, length); } memset(outerKeyPad + length, 0, blockSize - length); memset(innerKeyPad + length, 0, blockSize - length); for (size_t i = 0; i < blockSize; i++) { outerKeyPad[i] ^= 0x5C; innerKeyPad[i] ^= 0x36; } _outerHash = [[_hashClass cryptoHash] retain]; _innerHash = [[_hashClass cryptoHash] retain]; [_outerHash updateWithBuffer: outerKeyPad length: blockSize]; [_innerHash updateWithBuffer: innerKeyPad length: blockSize]; objc_autoreleasePoolPop(pool); _outerHashCopy = [_outerHash copy]; _innerHashCopy = [_innerHash copy]; _calculated = false; } - (void)updateWithBuffer: (const void*)buffer length: (size_t)length { if (_innerHash == nil) @throw [OFInvalidArgumentException exception]; if (_calculated) @throw [OFHashAlreadyCalculatedException exceptionWithObject: self]; [_innerHash updateWithBuffer: buffer length: length]; } - (const unsigned char*)digest { if (_outerHash == nil || _innerHash == nil) @throw [OFInvalidArgumentException exception]; if (_calculated) return [_outerHash digest]; [_outerHash updateWithBuffer: [_innerHash digest] length: [_hashClass digestSize]]; _calculated = true; return [_outerHash digest]; } - (size_t)digestSize { return [_hashClass digestSize]; } - (void)reset { [_outerHash release]; [_innerHash release]; _outerHash = _innerHash = nil; _outerHash = [_outerHashCopy copy]; _innerHash = [_innerHashCopy copy]; _calculated = false; } @end |