[fusl] clang-format fusl

fusl/src/crypt/crypt_sha256.c

 /*
  * public domain sha256 crypt implementation
  *
  * original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt
  * in this implementation at least 32bit int is assumed,
  * key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected
  * in the salt and rounds= setting must contain a valid iteration count,
  * on error "*" is returned.
  */
 #include <ctype.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
 #include <stdint.h>
 
 /* public domain sha256 implementation based on fips180-3 */
 
 struct sha256 {
-        uint64_t len;    /* processed message length */
-        uint32_t h[8];   /* hash state */
-        uint8_t buf[64]; /* message block buffer */
+  uint64_t len;    /* processed message length */
+  uint32_t h[8];   /* hash state */
+  uint8_t buf[64]; /* message block buffer */
 };
 
-static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); }
-#define Ch(x,y,z)  (z ^ (x & (y ^ z)))
-#define Maj(x,y,z) ((x & y) | (z & (x | y)))
-#define S0(x)      (ror(x,2) ^ ror(x,13) ^ ror(x,22))
-#define S1(x)      (ror(x,6) ^ ror(x,11) ^ ror(x,25))
-#define R0(x)      (ror(x,7) ^ ror(x,18) ^ (x>>3))
-#define R1(x)      (ror(x,17) ^ ror(x,19) ^ (x>>10))
+static uint32_t ror(uint32_t n, int k) {
+  return (n >> k) | (n << (32 - k));
+}
+#define Ch(x, y, z) (z ^ (x & (y ^ z)))
+#define Maj(x, y, z) ((x & y) | (z & (x | y)))
+#define S0(x) (ror(x, 2) ^ ror(x, 13) ^ ror(x, 22))
+#define S1(x) (ror(x, 6) ^ ror(x, 11) ^ ror(x, 25))
+#define R0(x) (ror(x, 7) ^ ror(x, 18) ^ (x >> 3))
+#define R1(x) (ror(x, 17) ^ ror(x, 19) ^ (x >> 10))
 
 static const uint32_t K[64] = {
-0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
-0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
-0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
-0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
-0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
-0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
-0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
-0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
-};
+    0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
+    0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
+    0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
+    0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+    0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
+    0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
+    0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
+    0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+    0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
+    0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
+    0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2};
 
-static void processblock(struct sha256 *s, const uint8_t *buf)
-{
-        uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
-        int i;
+static void processblock(struct sha256* s, const uint8_t* buf) {
+  uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
+  int i;
 
-        for (i = 0; i < 16; i++) {
-                W[i] = (uint32_t)buf[4*i]<<24;
-                W[i] |= (uint32_t)buf[4*i+1]<<16;
-                W[i] |= (uint32_t)buf[4*i+2]<<8;
-                W[i] |= buf[4*i+3];
-        }
-        for (; i < 64; i++)
-                W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
-        a = s->h[0];
-        b = s->h[1];
-        c = s->h[2];
-        d = s->h[3];
-        e = s->h[4];
-        f = s->h[5];
-        g = s->h[6];
-        h = s->h[7];
-        for (i = 0; i < 64; i++) {
-                t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
-                t2 = S0(a) + Maj(a,b,c);
-                h = g;
-                g = f;
-                f = e;
-                e = d + t1;
-                d = c;
-                c = b;
-                b = a;
-                a = t1 + t2;
-        }
-        s->h[0] += a;
-        s->h[1] += b;
-        s->h[2] += c;
-        s->h[3] += d;
-        s->h[4] += e;
-        s->h[5] += f;
-        s->h[6] += g;
-        s->h[7] += h;
+  for (i = 0; i < 16; i++) {
+    W[i] = (uint32_t)buf[4 * i] << 24;
+    W[i] |= (uint32_t)buf[4 * i + 1] << 16;
+    W[i] |= (uint32_t)buf[4 * i + 2] << 8;
+    W[i] |= buf[4 * i + 3];
+  }
+  for (; i < 64; i++)
+    W[i] = R1(W[i - 2]) + W[i - 7] + R0(W[i - 15]) + W[i - 16];
+  a = s->h[0];
+  b = s->h[1];
+  c = s->h[2];
+  d = s->h[3];
+  e = s->h[4];
+  f = s->h[5];
+  g = s->h[6];
+  h = s->h[7];
+  for (i = 0; i < 64; i++) {
+    t1 = h + S1(e) + Ch(e, f, g) + K[i] + W[i];
+    t2 = S0(a) + Maj(a, b, c);
+    h = g;
+    g = f;
+    f = e;
+    e = d + t1;
+    d = c;
+    c = b;
+    b = a;
+    a = t1 + t2;
+  }
+  s->h[0] += a;
+  s->h[1] += b;
+  s->h[2] += c;
+  s->h[3] += d;
+  s->h[4] += e;
+  s->h[5] += f;
+  s->h[6] += g;
+  s->h[7] += h;
 }
 
-static void pad(struct sha256 *s)
-{
-        unsigned r = s->len % 64;
+static void pad(struct sha256* s) {
+  unsigned r = s->len % 64;
 
-        s->buf[r++] = 0x80;
-        if (r > 56) {
-                memset(s->buf + r, 0, 64 - r);
-                r = 0;
-                processblock(s, s->buf);
-        }
-        memset(s->buf + r, 0, 56 - r);
-        s->len *= 8;
-        s->buf[56] = s->len >> 56;
-        s->buf[57] = s->len >> 48;
-        s->buf[58] = s->len >> 40;
-        s->buf[59] = s->len >> 32;
-        s->buf[60] = s->len >> 24;
-        s->buf[61] = s->len >> 16;
-        s->buf[62] = s->len >> 8;
-        s->buf[63] = s->len;
-        processblock(s, s->buf);
+  s->buf[r++] = 0x80;
+  if (r > 56) {
+    memset(s->buf + r, 0, 64 - r);
+    r = 0;
+    processblock(s, s->buf);
+  }
+  memset(s->buf + r, 0, 56 - r);
+  s->len *= 8;
+  s->buf[56] = s->len >> 56;
+  s->buf[57] = s->len >> 48;
+  s->buf[58] = s->len >> 40;
+  s->buf[59] = s->len >> 32;
+  s->buf[60] = s->len >> 24;
+  s->buf[61] = s->len >> 16;
+  s->buf[62] = s->len >> 8;
+  s->buf[63] = s->len;
+  processblock(s, s->buf);
 }
 
-static void sha256_init(struct sha256 *s)
-{
-        s->len = 0;
-        s->h[0] = 0x6a09e667;
-        s->h[1] = 0xbb67ae85;
-        s->h[2] = 0x3c6ef372;
-        s->h[3] = 0xa54ff53a;
-        s->h[4] = 0x510e527f;
-        s->h[5] = 0x9b05688c;
-        s->h[6] = 0x1f83d9ab;
-        s->h[7] = 0x5be0cd19;
+static void sha256_init(struct sha256* s) {
+  s->len = 0;
+  s->h[0] = 0x6a09e667;
+  s->h[1] = 0xbb67ae85;
+  s->h[2] = 0x3c6ef372;
+  s->h[3] = 0xa54ff53a;
+  s->h[4] = 0x510e527f;
+  s->h[5] = 0x9b05688c;
+  s->h[6] = 0x1f83d9ab;
+  s->h[7] = 0x5be0cd19;
 }
 
-static void sha256_sum(struct sha256 *s, uint8_t *md)
-{
-        int i;
+static void sha256_sum(struct sha256* s, uint8_t* md) {
+  int i;
 
-        pad(s);
-        for (i = 0; i < 8; i++) {
-                md[4*i] = s->h[i] >> 24;
-                md[4*i+1] = s->h[i] >> 16;
-                md[4*i+2] = s->h[i] >> 8;
-                md[4*i+3] = s->h[i];
-        }
+  pad(s);
+  for (i = 0; i < 8; i++) {
+    md[4 * i] = s->h[i] >> 24;
+    md[4 * i + 1] = s->h[i] >> 16;
+    md[4 * i + 2] = s->h[i] >> 8;
+    md[4 * i + 3] = s->h[i];
+  }
 }
 
-static void sha256_update(struct sha256 *s, const void *m, unsigned long len)
-{
-        const uint8_t *p = m;
-        unsigned r = s->len % 64;
+static void sha256_update(struct sha256* s, const void* m, unsigned long len) {
+  const uint8_t* p = m;
+  unsigned r = s->len % 64;
 
-        s->len += len;
-        if (r) {
-                if (len < 64 - r) {
-                        memcpy(s->buf + r, p, len);
-                        return;
-                }
-                memcpy(s->buf + r, p, 64 - r);
-                len -= 64 - r;
-                p += 64 - r;
-                processblock(s, s->buf);
-        }
-        for (; len >= 64; len -= 64, p += 64)
-                processblock(s, p);
-        memcpy(s->buf, p, len);
+  s->len += len;
+  if (r) {
+    if (len < 64 - r) {
+      memcpy(s->buf + r, p, len);
+      return;
+    }
+    memcpy(s->buf + r, p, 64 - r);
+    len -= 64 - r;
+    p += 64 - r;
+    processblock(s, s->buf);
+  }
+  for (; len >= 64; len -= 64, p += 64)
+    processblock(s, p);
+  memcpy(s->buf, p, len);
 }
 
 static const unsigned char b64[] =
-"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+    "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
 
-static char *to64(char *s, unsigned int u, int n)
-{
-        while (--n >= 0) {
-                *s++ = b64[u % 64];
-                u /= 64;
-        }
-        return s;
+static char* to64(char* s, unsigned int u, int n) {
+  while (--n >= 0) {
+    *s++ = b64[u % 64];
+    u /= 64;
+  }
+  return s;
 }
 
 /* key limit is not part of the original design, added for DoS protection.
  * rounds limit has been lowered (versus the reference/spec), also for DoS
  * protection. runtime is O(klen^2 + klen*rounds) */
 #define KEY_MAX 256
 #define SALT_MAX 16
 #define ROUNDS_DEFAULT 5000
 #define ROUNDS_MIN 1000
 #define ROUNDS_MAX 9999999
 
 /* hash n bytes of the repeated md message digest */
-static void hashmd(struct sha256 *s, unsigned int n, const void *md)
-{
-        unsigned int i;
+static void hashmd(struct sha256* s, unsigned int n, const void* md) {
+  unsigned int i;
 
-        for (i = n; i > 32; i -= 32)
-                sha256_update(s, md, 32);
-        sha256_update(s, md, i);
+  for (i = n; i > 32; i -= 32)
+    sha256_update(s, md, 32);
+  sha256_update(s, md, i);
 }
 
-static char *sha256crypt(const char *key, const char *setting, char *output)
-{
-        struct sha256 ctx;
-        unsigned char md[32], kmd[32], smd[32];
-        unsigned int i, r, klen, slen;
-        char rounds[20] = "";
-        const char *salt;
-        char *p;
+static char* sha256crypt(const char* key, const char* setting, char* output) {
+  struct sha256 ctx;
+  unsigned char md[32], kmd[32], smd[32];
+  unsigned int i, r, klen, slen;
+  char rounds[20] = "";
+  const char* salt;
+  char* p;
 
-        /* reject large keys */
-        klen = strnlen(key, KEY_MAX+1);
-        if (klen > KEY_MAX)
-                return 0;
+  /* reject large keys */
+  klen = strnlen(key, KEY_MAX + 1);
+  if (klen > KEY_MAX)
+    return 0;
 
-        /* setting: $5$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
-        if (strncmp(setting, "$5$", 3) != 0)
-                return 0;
-        salt = setting + 3;
+  /* setting: $5$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
+  if (strncmp(setting, "$5$", 3) != 0)
+    return 0;
+  salt = setting + 3;
 
-        r = ROUNDS_DEFAULT;
-        if (strncmp(salt, "rounds=", sizeof "rounds=" - 1) == 0) {
-                unsigned long u;
-                char *end;
+  r = ROUNDS_DEFAULT;
+  if (strncmp(salt, "rounds=", sizeof "rounds=" - 1) == 0) {
+    unsigned long u;
+    char* end;
 
-                /*
-                 * this is a deviation from the reference:
-                 * bad rounds setting is rejected if it is
-                 * - empty
-                 * - unterminated (missing '$')
-                 * - begins with anything but a decimal digit
-                 * the reference implementation treats these bad
-                 * rounds as part of the salt or parse them with
-                 * strtoul semantics which may cause problems
-                 * including non-portable hashes that depend on
-                 * the host's value of ULONG_MAX.
-                 */
-                salt += sizeof "rounds=" - 1;
-                if (!isdigit(*salt))
-                        return 0;
-                u = strtoul(salt, &end, 10);
-                if (*end != '$')
-                        return 0;
-                salt = end+1;
-                if (u < ROUNDS_MIN)
-                        r = ROUNDS_MIN;
-                else if (u > ROUNDS_MAX)
-                        r = ROUNDS_MAX;
-                else
-                        r = u;
-                /* needed when rounds is zero prefixed or out of bounds */
-                sprintf(rounds, "rounds=%u$", r);
-        }
+    /*
+     * this is a deviation from the reference:
+     * bad rounds setting is rejected if it is
+     * - empty
+     * - unterminated (missing '$')
+     * - begins with anything but a decimal digit
+     * the reference implementation treats these bad
+     * rounds as part of the salt or parse them with
+     * strtoul semantics which may cause problems
+     * including non-portable hashes that depend on
+     * the host's value of ULONG_MAX.
+     */
+    salt += sizeof "rounds=" - 1;
+    if (!isdigit(*salt))
+      return 0;
+    u = strtoul(salt, &end, 10);
+    if (*end != '$')
+      return 0;
+    salt = end + 1;
+    if (u < ROUNDS_MIN)
+      r = ROUNDS_MIN;
+    else if (u > ROUNDS_MAX)
+      r = ROUNDS_MAX;
+    else
+      r = u;
+    /* needed when rounds is zero prefixed or out of bounds */
+    sprintf(rounds, "rounds=%u$", r);
+  }
 
-        for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
-                /* reject characters that interfere with /etc/shadow parsing */
-                if (salt[i] == '\n' || salt[i] == ':')
-                        return 0;
-        slen = i;
+  for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
+    /* reject characters that interfere with /etc/shadow parsing */
+    if (salt[i] == '\n' || salt[i] == ':')
+      return 0;
+  slen = i;
 
-        /* B = sha(key salt key) */
-        sha256_init(&ctx);
-        sha256_update(&ctx, key, klen);
-        sha256_update(&ctx, salt, slen);
-        sha256_update(&ctx, key, klen);
-        sha256_sum(&ctx, md);
+  /* B = sha(key salt key) */
+  sha256_init(&ctx);
+  sha256_update(&ctx, key, klen);
+  sha256_update(&ctx, salt, slen);
+  sha256_update(&ctx, key, klen);
+  sha256_sum(&ctx, md);
 
-        /* A = sha(key salt repeat-B alternate-B-key) */
-        sha256_init(&ctx);
-        sha256_update(&ctx, key, klen);
-        sha256_update(&ctx, salt, slen);
-        hashmd(&ctx, klen, md);
-        for (i = klen; i > 0; i >>= 1)
-                if (i & 1)
-                        sha256_update(&ctx, md, sizeof md);
-                else
-                        sha256_update(&ctx, key, klen);
-        sha256_sum(&ctx, md);
+  /* A = sha(key salt repeat-B alternate-B-key) */
+  sha256_init(&ctx);
+  sha256_update(&ctx, key, klen);
+  sha256_update(&ctx, salt, slen);
+  hashmd(&ctx, klen, md);
+  for (i = klen; i > 0; i >>= 1)
+    if (i & 1)
+      sha256_update(&ctx, md, sizeof md);
+    else
+      sha256_update(&ctx, key, klen);
+  sha256_sum(&ctx, md);
 
-        /* DP = sha(repeat-key), this step takes O(klen^2) time */
-        sha256_init(&ctx);
-        for (i = 0; i < klen; i++)
-                sha256_update(&ctx, key, klen);
-        sha256_sum(&ctx, kmd);
+  /* DP = sha(repeat-key), this step takes O(klen^2) time */
+  sha256_init(&ctx);
+  for (i = 0; i < klen; i++)
+    sha256_update(&ctx, key, klen);
+  sha256_sum(&ctx, kmd);
 
-        /* DS = sha(repeat-salt) */
-        sha256_init(&ctx);
-        for (i = 0; i < 16 + md[0]; i++)
-                sha256_update(&ctx, salt, slen);
-        sha256_sum(&ctx, smd);
+  /* DS = sha(repeat-salt) */
+  sha256_init(&ctx);
+  for (i = 0; i < 16 + md[0]; i++)
+    sha256_update(&ctx, salt, slen);
+  sha256_sum(&ctx, smd);
 
-        /* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
-        for (i = 0; i < r; i++) {
-                sha256_init(&ctx);
-                if (i % 2)
-                        hashmd(&ctx, klen, kmd);
-                else
-                        sha256_update(&ctx, md, sizeof md);
-                if (i % 3)
-                        sha256_update(&ctx, smd, slen);
-                if (i % 7)
-                        hashmd(&ctx, klen, kmd);
-                if (i % 2)
-                        sha256_update(&ctx, md, sizeof md);
-                else
-                        hashmd(&ctx, klen, kmd);
-                sha256_sum(&ctx, md);
-        }
+  /* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
+  for (i = 0; i < r; i++) {
+    sha256_init(&ctx);
+    if (i % 2)
+      hashmd(&ctx, klen, kmd);
+    else
+      sha256_update(&ctx, md, sizeof md);
+    if (i % 3)
+      sha256_update(&ctx, smd, slen);
+    if (i % 7)
+      hashmd(&ctx, klen, kmd);
+    if (i % 2)
+      sha256_update(&ctx, md, sizeof md);
+    else
+      hashmd(&ctx, klen, kmd);
+    sha256_sum(&ctx, md);
+  }
 
-        /* output is $5$rounds=n$salt$hash */
-        p = output;
-        p += sprintf(p, "$5$%s%.*s$", rounds, slen, salt);
-        static const unsigned char perm[][3] = {
-                0,10,20,21,1,11,12,22,2,3,13,23,24,4,14,
-                15,25,5,6,16,26,27,7,17,18,28,8,9,19,29 };
-        for (i=0; i<10; i++) p = to64(p,
-                (md[perm[i][0]]<<16)|(md[perm[i][1]]<<8)|md[perm[i][2]], 4);
-        p = to64(p, (md[31]<<8)|md[30], 3);
-        *p = 0;
-        return output;
+  /* output is $5$rounds=n$salt$hash */
+  p = output;
+  p += sprintf(p, "$5$%s%.*s$", rounds, slen, salt);
+  static const unsigned char perm[][3] = {
+      0,  10, 20, 21, 1,  11, 12, 22, 2,  3,  13, 23, 24, 4,  14,
+      15, 25, 5,  6,  16, 26, 27, 7,  17, 18, 28, 8,  9,  19, 29};
+  for (i = 0; i < 10; i++)
+    p = to64(p, (md[perm[i][0]] << 16) | (md[perm[i][1]] << 8) | md[perm[i][2]],
+             4);
+  p = to64(p, (md[31] << 8) | md[30], 3);
+  *p = 0;
+  return output;
 }
 
-char *__crypt_sha256(const char *key, const char *setting, char *output)
-{
-        static const char testkey[] = "Xy01@#\x01\x02\x80\x7f\xff\r\n\x81\t !";
-        static const char testsetting[] = "$5$rounds=1234$abc0123456789$";
-        static const char testhash[] = "$5$rounds=1234$abc0123456789$3VfDjPt05VHFn47C/ojFZ6KRPYrOjj1lLbH.dkF3bZ6";
-        char testbuf[128];
-        char *p, *q;
+char* __crypt_sha256(const char* key, const char* setting, char* output) {
+  static const char testkey[] = "Xy01@#\x01\x02\x80\x7f\xff\r\n\x81\t !";
+  static const char testsetting[] = "$5$rounds=1234$abc0123456789$";
+  static const char testhash[] =
+      "$5$rounds=1234$abc0123456789$3VfDjPt05VHFn47C/"
+      "ojFZ6KRPYrOjj1lLbH.dkF3bZ6";
+  char testbuf[128];
+  char *p, *q;
 
-        p = sha256crypt(key, setting, output);
-        /* self test and stack cleanup */
-        q = sha256crypt(testkey, testsetting, testbuf);
-        if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
-                return "*";
-        return p;
+  p = sha256crypt(key, setting, output);
+  /* self test and stack cleanup */
+  q = sha256crypt(testkey, testsetting, testbuf);
+  if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
+    return "*";
+  return p;
 }