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https://github.com/urbit/shrub.git
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106 lines
1.9 KiB
C
106 lines
1.9 KiB
C
#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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#include <math.h>
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#include "b64.h"
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#include "slowequals.h"
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#include "libscrypt.h"
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#ifdef _WIN32
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/* On windows, strtok uses a thread-local static variable in strtok to
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* make strtok thread-safe. It also neglects to provide a strtok_r. */
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#define strtok_r(str, val, saveptr) strtok((str), (val))
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#endif
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int libscrypt_check(char *mcf, const char *password)
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{
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/* Return values:
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* <0 error
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* == 0 password incorrect
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* >0 correct password
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*/
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#ifndef _WIN32
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char *saveptr = NULL;
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#endif
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uint32_t params;
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uint64_t N;
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uint8_t r, p;
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int retval;
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uint8_t hashbuf[64];
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char outbuf[128];
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uint8_t salt[32];
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char *tok;
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if(mcf == NULL)
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{
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return -1;
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}
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if(memcmp(mcf, SCRYPT_MCF_ID, 3) != 0)
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{
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/* Only version 0 supported */
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return -1;
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}
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tok = strtok_r(mcf, "$", &saveptr);
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if ( !tok )
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return -1;
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tok = strtok_r(NULL, "$", &saveptr);
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if ( !tok )
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return -1;
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params = (uint32_t)strtoul(tok, NULL, 16);
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if ( params == 0 )
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return -1;
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tok = strtok_r(NULL, "$", &saveptr);
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if ( !tok )
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return -1;
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p = params & 0xff;
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r = (params >> 8) & 0xff;
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N = params >> 16;
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if (N > SCRYPT_SAFE_N)
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return -1;
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N = (uint64_t)1 << N;
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/* Useful debugging:
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printf("We've obtained salt 'N' r p of '%s' %d %d %d\n", tok, N,r,p);
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*/
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memset(salt, 0, sizeof(salt)); /* Keeps splint happy */
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retval = libscrypt_b64_decode(tok, (unsigned char*)salt, sizeof(salt));
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if (retval < 1)
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return -1;
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retval = libscrypt_scrypt((uint8_t*)password, strlen(password), salt,
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(uint32_t)retval, N, r, p, hashbuf, sizeof(hashbuf));
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if (retval != 0)
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return -1;
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retval = libscrypt_b64_encode((unsigned char*)hashbuf, sizeof(hashbuf),
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outbuf, sizeof(outbuf));
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if (retval == 0)
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return -1;
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tok = strtok_r(NULL, "$", &saveptr);
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if ( !tok )
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return -1;
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if(slow_equals(tok, outbuf) == 0)
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return 0;
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return 1; /* This is the "else" condition */
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}
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