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Differential D7306 Diff 18759 lib/libcrypt/crypt-sha256.c

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lib/libcrypt/crypt-sha256.c

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#define SALT_LEN_MAX 16 #define SALT_LEN_MAX 16
/* Default number of rounds if not explicitly specified. */ /* Default number of rounds if not explicitly specified. */
#define ROUNDS_DEFAULT 5000 #define ROUNDS_DEFAULT 5000
/* Minimum number of rounds. */ /* Minimum number of rounds. */
#define ROUNDS_MIN 1000 #define ROUNDS_MIN 1000
/* Maximum number of rounds. */ /* Maximum number of rounds. */
#define ROUNDS_MAX 999999999 #define ROUNDS_MAX 999999999
static char * int
crypt_sha256_r(const char *key, const char *salt, char *buffer, int buflen) crypt_sha256(const char *key, const char *salt, char *buffer)
{ {
u_long srounds; u_long srounds;
int n;
uint8_t alt_result[32], temp_result[32]; uint8_t alt_result[32], temp_result[32];
SHA256_CTX ctx, alt_ctx; SHA256_CTX ctx, alt_ctx;
size_t salt_len, key_len, cnt, rounds; size_t salt_len, key_len, cnt, rounds;
char *cp, *copied_key, *copied_salt, *p_bytes, *s_bytes, *endp; char *cp, *copied_key, *copied_salt, *p_bytes, *s_bytes, *endp;
const char *num; const char *num;
bool rounds_custom; bool rounds_custom;
copied_key = NULL; copied_key = NULL;
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SHA256_Update(&ctx, p_bytes, key_len); SHA256_Update(&ctx, p_bytes, key_len);
/* Create intermediate result. */ /* Create intermediate result. */
SHA256_Final(alt_result, &ctx); SHA256_Final(alt_result, &ctx);
} }
/* Now we can construct the result string. It consists of three /* Now we can construct the result string. It consists of three
* parts. */ * parts. */
cp = stpncpy(buffer, sha256_salt_prefix, MAX(0, buflen)); cp = stpcpy(buffer, sha256_salt_prefix);
buflen -= sizeof(sha256_salt_prefix) - 1;
if (rounds_custom) { if (rounds_custom)
n = snprintf(cp, MAX(0, buflen), "%s%zu$", cp += sprintf(cp, "%s%zu$", sha256_rounds_prefix, rounds);
sha256_rounds_prefix, rounds);
cp += n; cp = stpncpy(cp, salt, salt_len);
buflen -= n;
}
cp = stpncpy(cp, salt, MIN((size_t)MAX(0, buflen), salt_len));
buflen -= MIN((size_t)MAX(0, buflen), salt_len);
if (buflen > 0) {
*cp++ = '$'; *cp++ = '$';
--buflen;
}
b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4, &buflen, &cp); b64_from_24bit(alt_result[0], alt_result[10], alt_result[20], 4, &cp);
b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4, &buflen, &cp); b64_from_24bit(alt_result[21], alt_result[1], alt_result[11], 4, &cp);
b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4, &buflen, &cp); b64_from_24bit(alt_result[12], alt_result[22], alt_result[2], 4, &cp);
b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4, &buflen, &cp); b64_from_24bit(alt_result[3], alt_result[13], alt_result[23], 4, &cp);
b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4, &buflen, &cp); b64_from_24bit(alt_result[24], alt_result[4], alt_result[14], 4, &cp);
b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4, &buflen, &cp); b64_from_24bit(alt_result[15], alt_result[25], alt_result[5], 4, &cp);
b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4, &buflen, &cp); b64_from_24bit(alt_result[6], alt_result[16], alt_result[26], 4, &cp);
b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4, &buflen, &cp); b64_from_24bit(alt_result[27], alt_result[7], alt_result[17], 4, &cp);
b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4, &buflen, &cp); b64_from_24bit(alt_result[18], alt_result[28], alt_result[8], 4, &cp);
b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4, &buflen, &cp); b64_from_24bit(alt_result[9], alt_result[19], alt_result[29], 4, &cp);
b64_from_24bit(0, alt_result[31], alt_result[30], 3, &buflen, &cp); b64_from_24bit(0, alt_result[31], alt_result[30], 3, &cp);
if (buflen <= 0) {
errno = ERANGE;
buffer = NULL;
}
else
*cp = '\0'; /* Terminate the string. */ *cp = '\0'; /* Terminate the string. */
/* Clear the buffer for the intermediate result so that people /* Clear the buffer for the intermediate result so that people
* attaching to processes or reading core dumps cannot get any * attaching to processes or reading core dumps cannot get any
* information. We do it in this way to clear correct_words[] inside * information. We do it in this way to clear correct_words[] inside
* the SHA256 implementation as well. */ * the SHA256 implementation as well. */
SHA256_Init(&ctx); SHA256_Init(&ctx);
SHA256_Final(alt_result, &ctx); SHA256_Final(alt_result, &ctx);
memset(temp_result, '\0', sizeof(temp_result)); memset(temp_result, '\0', sizeof(temp_result));
memset(p_bytes, '\0', key_len); memset(p_bytes, '\0', key_len);
memset(s_bytes, '\0', salt_len); memset(s_bytes, '\0', salt_len);
memset(&ctx, '\0', sizeof(ctx)); memset(&ctx, '\0', sizeof(ctx));
memset(&alt_ctx, '\0', sizeof(alt_ctx)); memset(&alt_ctx, '\0', sizeof(alt_ctx));
if (copied_key != NULL) if (copied_key != NULL)
memset(copied_key, '\0', key_len); memset(copied_key, '\0', key_len);
if (copied_salt != NULL) if (copied_salt != NULL)
memset(copied_salt, '\0', salt_len); memset(copied_salt, '\0', salt_len);
return buffer; return (0);
}
/* This entry point is equivalent to crypt(3). */
char *
crypt_sha256(const char *key, const char *salt)
{
/* We don't want to have an arbitrary limit in the size of the
* password. We can compute an upper bound for the size of the
* result in advance and so we can prepare the buffer we pass to
* `crypt_sha256_r'. */
static char *buffer;
static int buflen;
int needed;
char *new_buffer;
needed = (sizeof(sha256_salt_prefix) - 1
+ sizeof(sha256_rounds_prefix) + 9 + 1
+ strlen(salt) + 1 + 43 + 1);
if (buflen < needed) {
new_buffer = (char *)realloc(buffer, needed);
if (new_buffer == NULL)
return NULL;
buffer = new_buffer;
buflen = needed;
}
return crypt_sha256_r(key, salt, buffer, buflen);
} }
#ifdef TEST #ifdef TEST
static const struct { static const struct {
const char *input; const char *input;
const char result[32]; const char result[32];
} tests[] = } tests[] =
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