81 lines
2.7 KiB
Objective-C
81 lines
2.7 KiB
Objective-C
#import "CryptoTools.h"
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#import "Constraints.h"
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#import "Conversions.h"
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#import "EvpMessageDigest.h"
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#import "EvpSymetricUtil.h"
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#import "Util.h"
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@implementation CryptoTools
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+(NSData*)generateSecureRandomData:(NSUInteger)length {
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NSMutableData* d = [NSMutableData dataWithLength:length];
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int err = SecRandomCopyBytes(kSecRandomDefault, length, [d mutableBytes]);
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if (err != 0) {
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[SecurityFailure raise:@"SecRandomCopyBytes failed"];
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}
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return d;
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}
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+(uint16_t)generateSecureRandomUInt16 {
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return [[self generateSecureRandomData:sizeof(uint16_t)] bigEndianUInt16At:0];
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}
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+(uint32_t)generateSecureRandomUInt32 {
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return [[self generateSecureRandomData:sizeof(uint32_t)] bigEndianUInt32At:0];
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}
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+(NSString*) computeOtpWithPassword:(NSString*)password andCounter:(int64_t)counter {
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require(password != nil);
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NSData* d = [[@(counter) stringValue] encodedAsUtf8];
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NSData* h = [d hmacWithSha1WithKey:password.encodedAsUtf8];
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return h.encodedAsBase64;
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}
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@end
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@implementation NSData (CryptoTools)
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-(NSData*)hmacWithSha1WithKey:(NSData*)key {
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return [EvpMessageDigest hmacUsingSha1Data:self withKey:key];
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}
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-(NSData*)hmacWithSha256WithKey:(NSData*)key {
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return [EvpMessageDigest hmacUsingSha256Data:self withKey:key];
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}
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-(NSData*)encryptWithAesInCipherFeedbackModeWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil encryptMessage:self usingAes128WithCfbAndKey:key andIv:iv];
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}
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-(NSData*)encryptWithAesInCipherBlockChainingModeWithPkcs7PaddingWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil encryptMessage:self usingAes128WithCbcAndPaddingAndKey:key andIv:iv];
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}
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-(NSData*)encryptWithAesInCounterModeWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil encryptMessage:self usingAes128InCounterModeAndKey:key andIv:iv];
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}
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-(NSData*)decryptWithAesInCipherFeedbackModeWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil decryptMessage:self usingAes128WithCfbAndKey:key andIv:iv];
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}
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-(NSData*)decryptWithAesInCipherBlockChainingModeWithPkcs7PaddingWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil decryptMessage:self usingAes128WithCbcAndPaddingAndKey:key andIv:iv];
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}
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-(NSData*)decryptWithAesInCounterModeWithKey:(NSData*)key andIv:(NSData*)iv {
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return [EvpSymetricUtil decryptMessage:self usingAes128InCounterModeAndKey:key andIv:iv];
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}
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-(NSData*)hashWithSha256 {
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return [EvpMessageDigest hashWithSha256:self];
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}
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-(bool)isEqualToData_TimingSafe:(NSData*)other {
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if (other == nil) return false;
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NSUInteger n = self.length;
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if (other.length != n) return false;
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bool equal = true;
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for (NSUInteger i = 0; i < n; i++)
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equal &= [self uint8At:i] == [other uint8At:i];
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return equal;
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}
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@end
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