Tom Willemse
6aa289c124
- Add ~dispasstest~ which is used to test the DisPass algorithms. - Remove =main= from libdispass since shared libraries shouldn't have main functions - Add ~dispass.h~ which defines and exports the DisPass algorithms. - Make some functions in ~dispass.c~ static to make clear they're not exported anywhere.
118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <openssl/sha.h>
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#include <openssl/pem.h>
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#include <limits.h>
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#include "dispass.h"
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#define MIN(A, B) ((A) < (B) ? (A) : (B))
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#define MAXLEN (SHA512_DIGEST_LENGTH * 2)
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static char *
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base64encode(const void *data, int len)
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{ /* Copied from http://stackoverflow.com/a/16511093/459915 */
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BIO *b64_bio, *mem_bio;
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BUF_MEM *mem_bio_mem_ptr;
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char *ret;
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b64_bio = BIO_new(BIO_f_base64());
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mem_bio = BIO_new(BIO_s_mem());
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BIO_push(b64_bio, mem_bio);
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BIO_set_flags(b64_bio, BIO_FLAGS_BASE64_NO_NL);
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BIO_write(b64_bio, data, len);
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BIO_flush(b64_bio);
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BIO_get_mem_ptr(mem_bio, &mem_bio_mem_ptr);
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BIO_set_close(mem_bio, BIO_NOCLOSE);
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BIO_free_all(b64_bio);
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(*mem_bio_mem_ptr).data[(*mem_bio_mem_ptr).length] = '\0';
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ret = calloc((*mem_bio_mem_ptr).length, sizeof(char));
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strncpy(ret, (*mem_bio_mem_ptr).data, (*mem_bio_mem_ptr).length);
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BUF_MEM_free(mem_bio_mem_ptr);
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return ret;
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}
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static void
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sha512_to_string(unsigned char *data, char *buff)
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{
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int i;
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for (i = 0; i < SHA512_DIGEST_LENGTH; i++) {
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char sbuff[3] = { '\0' };
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sprintf(sbuff, "%02x", data[i]);
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strcat(buff, sbuff);
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}
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}
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static void
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rmchar(char rm, char **s)
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{
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int i, j = 0;
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char *new;
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size_t len;
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if (!strchr(*s, rm))
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return;
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len = strlen(*s);
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new = calloc(len + 1, sizeof(char));
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for (i = 0; i < len; i++) {
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char c;
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if ((c = (*s)[i]) != rm)
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new[j++] = c;
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}
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strncpy(*s, new, len);
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free(new);
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}
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char *
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dispass1(char *label, char *password, int len, long long unsigned seqno)
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{
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unsigned char *d;
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size_t tbufflen = strlen(label) + strlen(password) + 1;
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char *tbuff = calloc(tbufflen, sizeof(char));
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char buff[MAXLEN + 1] = { '\0' };
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char *b64;
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strcat(tbuff, label);
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strcat(tbuff, password);
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d = SHA512((unsigned char *)tbuff, strlen(tbuff), 0);
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free(tbuff);
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sha512_to_string(d, buff);
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b64 = base64encode(buff, strlen(buff));
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b64[MIN(len, MAXLEN)] = '\0';
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rmchar('=', &b64);
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return b64;
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}
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char *
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dispass2(char *label, char *password, int len, long long unsigned seqno)
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{
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unsigned char *d;
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char ibuff[300];
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char *tbuff, *b64;
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char buff[MAXLEN + 1] = { '\0' };
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sprintf(ibuff, "%llu", seqno);
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tbuff = calloc(strlen(label) + strlen(ibuff) + strlen(password) + 1,
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sizeof(char));
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strcat(tbuff, label);
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strcat(tbuff, ibuff);
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strcat(tbuff, password);
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d = SHA512((unsigned char *)tbuff, strlen(tbuff), 0);
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free(tbuff);
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sha512_to_string(d, buff);
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b64 = base64encode(buff, strlen(buff));
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b64[MIN(len, MAXLEN)] = '\0';
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rmchar('=', &b64);
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return b64;
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}
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