cog/Utils/SHA256Digest.m

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//
// SHA256Digest.m
// Cog
//
// Created by Christopher Snowhill on 2/22/22.
//
#import "SHA256Digest.h"
#import <CommonCrypto/CommonDigest.h>
@implementation SHA256Digest
+ (NSData *)digestBytes:(const void *)bytes length:(size_t)length {
uint8_t result[CC_SHA256_DIGEST_LENGTH];
CC_SHA256_CTX ctx;
CC_SHA256_Init(&ctx);
CC_SHA256_Update(&ctx, bytes, (CC_LONG)length);
CC_SHA256_Final(&result[0], &ctx);
return [NSData dataWithBytes:&result[0] length:sizeof(result)];
}
+ (NSData *)digestData:(const NSData *)data {
return [SHA256Digest digestBytes:[data bytes] length:[data length]];
}
+ (NSString *)digestBytesAsString:(const void *)bytes length:(size_t)length {
NSData *hashData = [SHA256Digest digestBytes:bytes length:length];
length = [hashData length];
NSMutableString *result = [NSMutableString stringWithCapacity:length * 2];
const uint8_t *values = (const uint8_t *)[hashData bytes];
for(size_t i = 0; i < length; ++i) {
[result appendFormat:@"%02x", values[i]];
}
return [NSString stringWithString:result];
}
+ (NSString *)digestDataAsString:(const NSData *)data {
return [SHA256Digest digestBytesAsString:[data bytes] length:[data length]];
}
@end