mirror of git://git.musl-libc.org/musl
add sha256/sha512 crypt
based on versions sent to the list by nsz, with some simplification and debloating. i'd still like to get them a bit smaller, or ideally merge them into a single file with most of the code being shared, but that can be done later.
This commit is contained in:
Rich Felker
parent
b439c051c7
commit
88bf5a8a8d
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@ -6,6 +6,6 @@ char *__crypt_r(const char *, const char *, struct crypt_data *);
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char *crypt(const char *key, const char *salt)
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{
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/* Note: update this size when we add more hash types */
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static char buf[64];
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static char buf[128];
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return __crypt_r(key, salt, (struct crypt_data *)buf);
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}
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@ -6,6 +6,8 @@ struct crypt_data;
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char *__crypt_des(const char *, const char *, char *);
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char *__crypt_md5(const char *, const char *, char *);
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char *__crypt_blowfish(const char *, const char *, char *);
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char *__crypt_sha256(const char *, const char *, char *);
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char *__crypt_sha512(const char *, const char *, char *);
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char *__crypt_r(const char *key, const char *salt, struct crypt_data *data)
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{
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@ -17,6 +19,10 @@ char *__crypt_r(const char *key, const char *salt, struct crypt_data *data)
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#endif
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if (salt[1] == '2' && salt[3] == '$')
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return __crypt_blowfish(key, salt, output);
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if (salt[1] == '5' && salt[2] == '$')
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return __crypt_sha256(key, salt, output);
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if (salt[1] == '6' && salt[2] == '$')
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return __crypt_sha512(key, salt, output);
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}
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return __crypt_des(key, salt, output);
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}
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@ -0,0 +1,322 @@
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/*
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* public domain sha256 crypt implementation
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*
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* original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt
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* in this implementation at least 32bit int is assumed,
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* key length is limited, the $5$ prefix is mandatory, '\n' and ':' is rejected
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* in the salt and rounds= setting must contain a valid iteration count,
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* on error "*" is returned.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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/* public domain sha256 implementation based on fips180-3 */
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struct sha256 {
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uint64_t len; /* processed message length */
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uint32_t h[8]; /* hash state */
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uint8_t buf[64]; /* message block buffer */
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};
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static uint32_t ror(uint32_t n, int k) { return (n >> k) | (n << (32-k)); }
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#define Ch(x,y,z) (z ^ (x & (y ^ z)))
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#define Maj(x,y,z) ((x & y) | (z & (x | y)))
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#define S0(x) (ror(x,2) ^ ror(x,13) ^ ror(x,22))
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#define S1(x) (ror(x,6) ^ ror(x,11) ^ ror(x,25))
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#define R0(x) (ror(x,7) ^ ror(x,18) ^ (x>>3))
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#define R1(x) (ror(x,17) ^ ror(x,19) ^ (x>>10))
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static const uint32_t K[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
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};
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static void processblock(struct sha256 *s, const uint8_t *buf)
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{
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uint32_t W[64], t1, t2, a, b, c, d, e, f, g, h;
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int i;
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for (i = 0; i < 16; i++) {
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W[i] = (uint32_t)buf[4*i]<<24;
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W[i] |= (uint32_t)buf[4*i+1]<<16;
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W[i] |= (uint32_t)buf[4*i+2]<<8;
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W[i] |= buf[4*i+3];
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}
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for (; i < 64; i++)
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W[i] = R1(W[i-2]) + W[i-7] + R0(W[i-15]) + W[i-16];
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a = s->h[0];
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b = s->h[1];
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c = s->h[2];
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d = s->h[3];
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e = s->h[4];
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f = s->h[5];
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g = s->h[6];
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h = s->h[7];
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for (i = 0; i < 64; i++) {
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t1 = h + S1(e) + Ch(e,f,g) + K[i] + W[i];
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t2 = S0(a) + Maj(a,b,c);
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h = g;
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g = f;
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f = e;
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e = d + t1;
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d = c;
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c = b;
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b = a;
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a = t1 + t2;
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}
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s->h[0] += a;
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s->h[1] += b;
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s->h[2] += c;
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s->h[3] += d;
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s->h[4] += e;
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s->h[5] += f;
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s->h[6] += g;
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s->h[7] += h;
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}
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static void pad(struct sha256 *s)
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{
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unsigned r = s->len % 64;
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s->buf[r++] = 0x80;
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if (r > 56) {
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memset(s->buf + r, 0, 64 - r);
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r = 0;
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processblock(s, s->buf);
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}
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memset(s->buf + r, 0, 56 - r);
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s->len *= 8;
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s->buf[56] = s->len >> 56;
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s->buf[57] = s->len >> 48;
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s->buf[58] = s->len >> 40;
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s->buf[59] = s->len >> 32;
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s->buf[60] = s->len >> 24;
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s->buf[61] = s->len >> 16;
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s->buf[62] = s->len >> 8;
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s->buf[63] = s->len;
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processblock(s, s->buf);
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}
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void sha256_init(struct sha256 *s)
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{
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s->len = 0;
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s->h[0] = 0x6a09e667;
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s->h[1] = 0xbb67ae85;
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s->h[2] = 0x3c6ef372;
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s->h[3] = 0xa54ff53a;
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s->h[4] = 0x510e527f;
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s->h[5] = 0x9b05688c;
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s->h[6] = 0x1f83d9ab;
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s->h[7] = 0x5be0cd19;
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}
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void sha256_sum(struct sha256 *s, uint8_t md[20])
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{
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int i;
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pad(s);
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for (i = 0; i < 8; i++) {
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md[4*i] = s->h[i] >> 24;
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md[4*i+1] = s->h[i] >> 16;
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md[4*i+2] = s->h[i] >> 8;
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md[4*i+3] = s->h[i];
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}
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}
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void sha256_update(struct sha256 *s, const void *m, unsigned long len)
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{
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const uint8_t *p = m;
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unsigned r = s->len % 64;
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s->len += len;
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if (r) {
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if (len < 64 - r) {
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memcpy(s->buf + r, p, len);
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return;
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}
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memcpy(s->buf + r, p, 64 - r);
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len -= 64 - r;
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p += 64 - r;
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processblock(s, s->buf);
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}
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for (; len >= 64; len -= 64, p += 64)
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processblock(s, p);
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memcpy(s->buf, p, len);
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}
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static unsigned char b64[] =
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"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
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static char *to64(char *s, unsigned int u, int n)
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{
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while (--n >= 0) {
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*s++ = b64[u % 64];
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u /= 64;
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}
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return s;
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}
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/* key limit is not part of the original design, added for DoS protection.
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* rounds limit has been lowered (versus the reference/spec), also for DoS
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* protection. runtime is O(klen^2 + klen*rounds) */
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#define KEY_MAX 256
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#define SALT_MAX 16
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#define ROUNDS_DEFAULT 5000
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#define ROUNDS_MIN 1000
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#define ROUNDS_MAX 50000
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/* hash n bytes of the repeated md message digest */
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static void hashmd(struct sha256 *s, unsigned int n, const void *md)
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{
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unsigned int i;
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for (i = n; i > 32; i -= 32)
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sha256_update(s, md, 32);
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sha256_update(s, md, i);
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}
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static char *sha256crypt(const char *key, const char *setting, char *output)
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{
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struct sha256 ctx;
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unsigned char md[32], kmd[32], smd[32];
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unsigned int i, r, klen, slen;
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char rounds[20] = "";
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const char *salt;
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char *p;
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/* reject large keys */
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klen = strnlen(key, KEY_MAX+1);
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if (klen > KEY_MAX)
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return 0;
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/* setting: $5$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
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if (strncmp(setting, "$5$", 3) != 0)
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return 0;
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salt = setting + 3;
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r = ROUNDS_DEFAULT;
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if (strncmp(salt, "rounds=", sizeof "rounds=" - 1) == 0) {
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unsigned long u;
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char *end;
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/*
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* this is a deviation from the reference:
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* bad rounds setting is rejected if it is
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* - empty
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* - unterminated (missing '$')
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* - begins with anything but a decimal digit
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* the reference implementation treats these bad
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* rounds as part of the salt or parse them with
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* strtoul semantics which may cause problems
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* including non-portable hashes that depend on
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* the host's value of ULONG_MAX.
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*/
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salt += sizeof "rounds=" - 1;
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if (!isdigit(*salt))
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return 0;
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u = strtoul(salt, &end, 10);
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if (*end != '$')
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return 0;
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salt = end+1;
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if (u < ROUNDS_MIN)
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r = ROUNDS_MIN;
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else if (u > ROUNDS_MAX)
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r = ROUNDS_MAX;
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else
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r = u;
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/* needed when rounds is zero prefixed or out of bounds */
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sprintf(rounds, "rounds=%u$", r);
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}
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for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
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/* reject characters that interfere with /etc/shadow parsing */
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if (salt[i] == '\n' || salt[i] == ':')
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return 0;
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slen = i;
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/* B = sha(key salt key) */
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sha256_init(&ctx);
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sha256_update(&ctx, key, klen);
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sha256_update(&ctx, salt, slen);
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sha256_update(&ctx, key, klen);
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sha256_sum(&ctx, md);
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/* A = sha(key salt repeat-B alternate-B-key) */
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sha256_init(&ctx);
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sha256_update(&ctx, key, klen);
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sha256_update(&ctx, salt, slen);
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hashmd(&ctx, klen, md);
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for (i = klen; i > 0; i >>= 1)
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if (i & 1)
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sha256_update(&ctx, md, sizeof md);
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else
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sha256_update(&ctx, key, klen);
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sha256_sum(&ctx, md);
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/* DP = sha(repeat-key), this step takes O(klen^2) time */
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sha256_init(&ctx);
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for (i = 0; i < klen; i++)
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sha256_update(&ctx, key, klen);
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sha256_sum(&ctx, kmd);
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/* DS = sha(repeat-salt) */
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sha256_init(&ctx);
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for (i = 0; i < 16 + md[0]; i++)
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sha256_update(&ctx, salt, slen);
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sha256_sum(&ctx, smd);
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/* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
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for (i = 0; i < r; i++) {
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sha256_init(&ctx);
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if (i % 2)
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hashmd(&ctx, klen, kmd);
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else
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sha256_update(&ctx, md, sizeof md);
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if (i % 3)
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sha256_update(&ctx, smd, slen);
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if (i % 7)
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hashmd(&ctx, klen, kmd);
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if (i % 2)
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sha256_update(&ctx, md, sizeof md);
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else
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hashmd(&ctx, klen, kmd);
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sha256_sum(&ctx, md);
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}
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/* output is $5$rounds=n$salt$hash */
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p = output;
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p += sprintf(p, "$5$%s%.*s$", rounds, slen, salt);
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static const unsigned char perm[][3] = {
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0,10,20,21,1,11,12,22,2,3,13,23,24,4,14,
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15,25,5,6,16,26,27,7,17,18,28,8,9,19,29 };
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for (i=0; i<10; i++) p = to64(p,
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(md[perm[i][0]]<<16)|(md[perm[i][1]]<<8)|md[perm[i][2]], 4);
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p = to64(p, (md[31]<<8)|md[30], 3);
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*p = 0;
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return output;
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}
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char *__crypt_sha256(const char *key, const char *setting, char *output)
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{
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static const char testkey[] = "Xy01@#\x01\x02\x80\x7f\xff\r\n\x81\t !";
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static const char testsetting[] = "$5$rounds=1234$abc0123456789$";
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static const char testhash[] = "$5$rounds=1234$abc0123456789$3VfDjPt05VHFn47C/ojFZ6KRPYrOjj1lLbH.dkF3bZ6";
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char testbuf[128];
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char *p, *q;
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p = sha256crypt(key, setting, output);
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/* self test and stack cleanup */
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q = sha256crypt(testkey, testsetting, testbuf);
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if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
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return "*";
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return p;
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}
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@ -0,0 +1,371 @@
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/*
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* public domain sha512 crypt implementation
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*
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* original sha crypt design: http://people.redhat.com/drepper/SHA-crypt.txt
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* in this implementation at least 32bit int is assumed,
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* key length is limited, the $6$ prefix is mandatory, '\n' and ':' is rejected
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* in the salt and rounds= setting must contain a valid iteration count,
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* on error "*" is returned.
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*/
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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/* public domain sha512 implementation based on fips180-3 */
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/* >=2^64 bits messages are not supported (about 2000 peta bytes) */
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struct sha512 {
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uint64_t len; /* processed message length */
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uint64_t h[8]; /* hash state */
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uint8_t buf[128]; /* message block buffer */
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};
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static uint64_t ror(uint64_t n, int k) { return (n >> k) | (n << (64-k)); }
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#define Ch(x,y,z) (z ^ (x & (y ^ z)))
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#define Maj(x,y,z) ((x & y) | (z & (x | y)))
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#define S0(x) (ror(x,28) ^ ror(x,34) ^ ror(x,39))
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#define S1(x) (ror(x,14) ^ ror(x,18) ^ ror(x,41))
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#define R0(x) (ror(x,1) ^ ror(x,8) ^ (x>>7))
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#define R1(x) (ror(x,19) ^ ror(x,61) ^ (x>>6))
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static const uint64_t K[80] = {
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0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL,
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0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL,
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0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL,
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0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL,
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0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL,
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0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL,
|
||||
0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL,
|
||||
0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL,
|
||||
0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL,
|
||||
0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL,
|
||||
0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL,
|
||||
0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL,
|
||||
0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL,
|
||||
0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL,
|
||||
0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL,
|
||||
0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL,
|
||||
0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL,
|
||||
0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL,
|
||||
0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL,
|
||||
0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL
|
||||
};
|
||||
|
||||
static void processblock(struct sha512 *s, const uint8_t *buf)
|
||||
{
|
||||
uint64_t W[80], t1, t2, a, b, c, d, e, f, g, h;
|
||||
int i;
|
||||
|
||||
for (i = 0; i < 16; i++) {
|
||||
W[i] = (uint64_t)buf[8*i]<<56;
|
||||
W[i] |= (uint64_t)buf[8*i+1]<<48;
|
||||
W[i] |= (uint64_t)buf[8*i+2]<<40;
|
||||
W[i] |= (uint64_t)buf[8*i+3]<<32;
|
||||
W[i] |= (uint64_t)buf[8*i+4]<<24;
|
||||
W[i] |= (uint64_t)buf[8*i+5]<<16;
|
||||
W[i] |= (uint64_t)buf[8*i+6]<<8;
|
||||
W[i] |= buf[8*i+7];
|
||||
}
|
||||
for (; i < 80; 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 < 80; 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 sha512 *s)
|
||||
{
|
||||
unsigned r = s->len % 128;
|
||||
|
||||
s->buf[r++] = 0x80;
|
||||
if (r > 112) {
|
||||
memset(s->buf + r, 0, 128 - r);
|
||||
r = 0;
|
||||
processblock(s, s->buf);
|
||||
}
|
||||
memset(s->buf + r, 0, 120 - r);
|
||||
s->len *= 8;
|
||||
s->buf[120] = s->len >> 56;
|
||||
s->buf[121] = s->len >> 48;
|
||||
s->buf[122] = s->len >> 40;
|
||||
s->buf[123] = s->len >> 32;
|
||||
s->buf[124] = s->len >> 24;
|
||||
s->buf[125] = s->len >> 16;
|
||||
s->buf[126] = s->len >> 8;
|
||||
s->buf[127] = s->len;
|
||||
processblock(s, s->buf);
|
||||
}
|
||||
|
||||
static void sha512_init(struct sha512 *s)
|
||||
{
|
||||
s->len = 0;
|
||||
s->h[0] = 0x6a09e667f3bcc908ULL;
|
||||
s->h[1] = 0xbb67ae8584caa73bULL;
|
||||
s->h[2] = 0x3c6ef372fe94f82bULL;
|
||||
s->h[3] = 0xa54ff53a5f1d36f1ULL;
|
||||
s->h[4] = 0x510e527fade682d1ULL;
|
||||
s->h[5] = 0x9b05688c2b3e6c1fULL;
|
||||
s->h[6] = 0x1f83d9abfb41bd6bULL;
|
||||
s->h[7] = 0x5be0cd19137e2179ULL;
|
||||
}
|
||||
|
||||
static void sha512_sum(struct sha512 *s, uint8_t md[20])
|
||||
{
|
||||
int i;
|
||||
|
||||
pad(s);
|
||||
for (i = 0; i < 8; i++) {
|
||||
md[8*i] = s->h[i] >> 56;
|
||||
md[8*i+1] = s->h[i] >> 48;
|
||||
md[8*i+2] = s->h[i] >> 40;
|
||||
md[8*i+3] = s->h[i] >> 32;
|
||||
md[8*i+4] = s->h[i] >> 24;
|
||||
md[8*i+5] = s->h[i] >> 16;
|
||||
md[8*i+6] = s->h[i] >> 8;
|
||||
md[8*i+7] = s->h[i];
|
||||
}
|
||||
}
|
||||
|
||||
static void sha512_update(struct sha512 *s, const void *m, unsigned long len)
|
||||
{
|
||||
const uint8_t *p = m;
|
||||
unsigned r = s->len % 128;
|
||||
|
||||
s->len += len;
|
||||
if (r) {
|
||||
if (len < 128 - r) {
|
||||
memcpy(s->buf + r, p, len);
|
||||
return;
|
||||
}
|
||||
memcpy(s->buf + r, p, 128 - r);
|
||||
len -= 128 - r;
|
||||
p += 128 - r;
|
||||
processblock(s, s->buf);
|
||||
}
|
||||
for (; len >= 128; len -= 128, p += 128)
|
||||
processblock(s, p);
|
||||
memcpy(s->buf, p, len);
|
||||
}
|
||||
|
||||
static unsigned char b64[] =
|
||||
"./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
|
||||
|
||||
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 50000
|
||||
|
||||
/* hash n bytes of the repeated md message digest */
|
||||
static void hashmd(struct sha512 *s, unsigned int n, const void *md)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = n; i > 64; i -= 64)
|
||||
sha512_update(s, md, 64);
|
||||
sha512_update(s, md, i);
|
||||
}
|
||||
|
||||
static char *sha512crypt(const char *key, const char *setting, char *output)
|
||||
{
|
||||
struct sha512 ctx;
|
||||
unsigned char md[64], kmd[64], smd[64];
|
||||
unsigned int i, r, klen, slen;
|
||||
char rounds[20] = "";
|
||||
const char *salt;
|
||||
char *p;
|
||||
|
||||
/* reject large keys */
|
||||
for (i = 0; i <= KEY_MAX && key[i]; i++);
|
||||
if (i > KEY_MAX)
|
||||
return 0;
|
||||
klen = i;
|
||||
|
||||
/* setting: $6$rounds=n$salt$ (rounds=n$ and closing $ are optional) */
|
||||
if (strncmp(setting, "$6$", 3) != 0)
|
||||
return 0;
|
||||
salt = setting + 3;
|
||||
|
||||
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$", r);
|
||||
}
|
||||
|
||||
for (i = 0; i < SALT_MAX && salt[i] && salt[i] != '$'; i++)
|
||||
/* reject characters that interfere with /etc/shadow parsing */
|
||||
if (salt[i] == '\n' || salt[i] == ':')
|
||||
return 0;
|
||||
slen = i;
|
||||
|
||||
/* B = sha(key salt key) */
|
||||
sha512_init(&ctx);
|
||||
sha512_update(&ctx, key, klen);
|
||||
sha512_update(&ctx, salt, slen);
|
||||
sha512_update(&ctx, key, klen);
|
||||
sha512_sum(&ctx, md);
|
||||
|
||||
/* A = sha(key salt repeat-B alternate-B-key) */
|
||||
sha512_init(&ctx);
|
||||
sha512_update(&ctx, key, klen);
|
||||
sha512_update(&ctx, salt, slen);
|
||||
hashmd(&ctx, klen, md);
|
||||
for (i = klen; i > 0; i >>= 1)
|
||||
if (i & 1)
|
||||
sha512_update(&ctx, md, sizeof md);
|
||||
else
|
||||
sha512_update(&ctx, key, klen);
|
||||
sha512_sum(&ctx, md);
|
||||
|
||||
/* DP = sha(repeat-key), this step takes O(klen^2) time */
|
||||
sha512_init(&ctx);
|
||||
for (i = 0; i < klen; i++)
|
||||
sha512_update(&ctx, key, klen);
|
||||
sha512_sum(&ctx, kmd);
|
||||
|
||||
/* DS = sha(repeat-salt) */
|
||||
sha512_init(&ctx);
|
||||
for (i = 0; i < 16 + md[0]; i++)
|
||||
sha512_update(&ctx, salt, slen);
|
||||
sha512_sum(&ctx, smd);
|
||||
|
||||
/* iterate A = f(A,DP,DS), this step takes O(rounds*klen) time */
|
||||
for (i = 0; i < r; i++) {
|
||||
sha512_init(&ctx);
|
||||
if (i % 2)
|
||||
hashmd(&ctx, klen, kmd);
|
||||
else
|
||||
sha512_update(&ctx, md, sizeof md);
|
||||
if (i % 3)
|
||||
sha512_update(&ctx, smd, slen);
|
||||
if (i % 7)
|
||||
hashmd(&ctx, klen, kmd);
|
||||
if (i % 2)
|
||||
sha512_update(&ctx, md, sizeof md);
|
||||
else
|
||||
hashmd(&ctx, klen, kmd);
|
||||
sha512_sum(&ctx, md);
|
||||
}
|
||||
|
||||
/* output is $6$rounds=n$salt$hash */
|
||||
p = output;
|
||||
p += sprintf(p, "$6$%s%.*s$", rounds, slen, salt);
|
||||
#if 1
|
||||
static const unsigned char perm[][3] = {
|
||||
0,21,42,22,43,1,44,2,23,3,24,45,25,46,4,
|
||||
47,5,26,6,27,48,28,49,7,50,8,29,9,30,51,
|
||||
31,52,10,53,11,32,12,33,54,34,55,13,56,14,35,
|
||||
15,36,57,37,58,16,59,17,38,18,39,60,40,61,19,
|
||||
62,20,41 };
|
||||
for (i=0; i<21; i++) p = to64(p,
|
||||
(md[perm[i][0]]<<16)|(md[perm[i][1]]<<8)|md[perm[i][2]], 4);
|
||||
#else
|
||||
p = to64(p, (md[0]<<16)|(md[21]<<8)|md[42], 4);
|
||||
p = to64(p, (md[22]<<16)|(md[43]<<8)|md[1], 4);
|
||||
p = to64(p, (md[44]<<16)|(md[2]<<8)|md[23], 4);
|
||||
p = to64(p, (md[3]<<16)|(md[24]<<8)|md[45], 4);
|
||||
p = to64(p, (md[25]<<16)|(md[46]<<8)|md[4], 4);
|
||||
p = to64(p, (md[47]<<16)|(md[5]<<8)|md[26], 4);
|
||||
p = to64(p, (md[6]<<16)|(md[27]<<8)|md[48], 4);
|
||||
p = to64(p, (md[28]<<16)|(md[49]<<8)|md[7], 4);
|
||||
p = to64(p, (md[50]<<16)|(md[8]<<8)|md[29], 4);
|
||||
p = to64(p, (md[9]<<16)|(md[30]<<8)|md[51], 4);
|
||||
p = to64(p, (md[31]<<16)|(md[52]<<8)|md[10], 4);
|
||||
p = to64(p, (md[53]<<16)|(md[11]<<8)|md[32], 4);
|
||||
p = to64(p, (md[12]<<16)|(md[33]<<8)|md[54], 4);
|
||||
p = to64(p, (md[34]<<16)|(md[55]<<8)|md[13], 4);
|
||||
p = to64(p, (md[56]<<16)|(md[14]<<8)|md[35], 4);
|
||||
p = to64(p, (md[15]<<16)|(md[36]<<8)|md[57], 4);
|
||||
p = to64(p, (md[37]<<16)|(md[58]<<8)|md[16], 4);
|
||||
p = to64(p, (md[59]<<16)|(md[17]<<8)|md[38], 4);
|
||||
p = to64(p, (md[18]<<16)|(md[39]<<8)|md[60], 4);
|
||||
p = to64(p, (md[40]<<16)|(md[61]<<8)|md[19], 4);
|
||||
p = to64(p, (md[62]<<16)|(md[20]<<8)|md[41], 4);
|
||||
#endif
|
||||
p = to64(p, md[63], 2);
|
||||
*p = 0;
|
||||
return output;
|
||||
}
|
||||
|
||||
char *__crypt_sha512(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[] = "$6$rounds=1234$abc0123456789$";
|
||||
static const char testhash[] = "$6$rounds=1234$abc0123456789$BCpt8zLrc/RcyuXmCDOE1ALqMXB2MH6n1g891HhFj8.w7LxGv.FTkqq6Vxc/km3Y0jE0j24jY5PIv/oOu6reg1";
|
||||
char testbuf[128];
|
||||
char *p, *q;
|
||||
|
||||
p = sha512crypt(key, setting, output);
|
||||
/* self test and stack cleanup */
|
||||
q = sha512crypt(testkey, testsetting, testbuf);
|
||||
if (!p || q != testbuf || memcmp(testbuf, testhash, sizeof testhash))
|
||||
return "*";
|
||||
return p;
|
||||
}
|
||||
Loading…
Reference in New Issue