MD5 HASH [Objective C]

md5.m

#include <CommonCrypto/CommonDigest.h>

- (void) md5:(NSString *)path
{
    unsigned char md[CC_MD5_DIGEST_LENGTH];
    char hash[CC_MD5_DIGEST_LENGTH*2+1];
    CC_MD5_CTX ctx;
    char buf[4096];
    size_t s;
    size_t total = 0;
    FILE *fd = fopen([path UTF8String], "r");
    if (fd) {
        CC_MD5_Init(&ctx);
        while ((s = fread(buf, sizeof(*buf), sizeof(buf), fd)) > 0) {
            total += s;
            CC_MD5_Update(&ctx, buf, (CC_LONG)s);
        }
        fclose(fd);
        CC_MD5_Final(md, &ctx);
        for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
            sprintf(hash+(i*2), "%02x", md[i]);
        }
        NSLog(@"HASH %s %lu %@\n", hash, total, path);
    }
}

- (void) md5:(NSData *)data offset:(long)offset {
    unsigned char md[CC_MD5_DIGEST_LENGTH];
    char hash[CC_MD5_DIGEST_LENGTH*2+1];
    CC_MD5_CTX ctx;
    CC_MD5_Init(&ctx);
    CC_MD5_Update(&ctx, [data bytes], (CC_LONG)[data length]);
    CC_MD5_Final(md, &ctx);
    for (int i = 0; i < CC_MD5_DIGEST_LENGTH; i++) {
        sprintf(hash+(i*2), "%02x", md[i]);
    }
    NSLog(@"HASH %lu:%lu (%lu) %s\n", offset, offset + [data length] - 1, [data length], hash);
}