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5 * This code is derived from software contributed to The DragonFly Project
6 * by Nolan Lum <nol888@gmail.com>
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36 #include <sys/types.h>
46 #define SHA256_SIZE 32
49 crypt_deprecated_sha256(const char *pw, const char *salt)
52 * Magic constant (prefix) used to run over the password data.
56 * A bug below (sizeof instead of strlen) mandates the extra data after
57 * the closing $. This data is what just happened to be (consistently
58 * miraculously) on the stack following magic on 64-bit.
60 static const char *magic = "$3$\0sha5";
62 static char passwd[120], *p;
63 static const char *sp, *ep;
64 unsigned char final[SHA256_SIZE];
66 struct sha256_ctx ctx;
69 /* Refine the salt. */
72 /* If it starts with the magic string, then skip that. */
73 if (!strncmp(sp, magic, strlen(magic)))
76 /* Stop at the first '$', max 8 chars. */
77 for (ep = sp; *ep && *ep != '$' && ep < (sp + 8); ep++)
80 /* Get the actual salt length. */
83 __crypt__sha256_init_ctx(&ctx);
85 /* Hash in the password first. */
86 __crypt__sha256_process_bytes(pw, strlen(pw), &ctx);
89 * Then the magic string
91 * XXX: sizeof instead of strlen, must retain
93 __crypt__sha256_process_bytes(magic, sizeof(magic), &ctx);
95 /* Then the raw salt. */
96 __crypt__sha256_process_bytes(sp, sl, &ctx);
98 /* Finish and create the output string. */
99 __crypt__sha256_finish_ctx(&ctx, final);
100 strcpy(passwd, magic);
101 strncat(passwd, sp, sl);
104 p = passwd + strlen(passwd);
106 l = (final[ 0] << 16) | (final[11] << 8) | final[21];
107 _crypt_to64(p, l, 4); p += 4;
108 l = (final[ 1] << 16) | (final[12] << 8) | final[22];
109 _crypt_to64(p, l, 4); p += 4;
110 l = (final[ 2] << 16) | (final[13] << 8) | final[23];
111 _crypt_to64(p, l, 4); p += 4;
112 l = (final[ 3] << 16) | (final[14] << 8) | final[24];
113 _crypt_to64(p, l, 4); p += 4;
114 l = (final[ 4] << 16) | (final[15] << 8) | final[25];
115 _crypt_to64(p, l, 4); p += 4;
116 l = (final[ 5] << 16) | (final[16] << 8) | final[26];
117 _crypt_to64(p, l, 4); p += 4;
118 l = (final[ 6] << 16) | (final[17] << 8) | final[27];
119 _crypt_to64(p, l, 4); p += 4;
120 l = (final[ 7] << 16) | (final[18] << 8) | final[28];
121 _crypt_to64(p, l, 4); p += 4;
122 l = (final[ 8] << 16) | (final[19] << 8) | final[29];
123 _crypt_to64(p, l, 4); p += 4;
124 l = (final[ 9] << 16) | (final[20] << 8) | final[30];
125 _crypt_to64(p, l, 4); p += 4;
126 l = (final[10] << 16) | (final[31] << 8);
127 _crypt_to64(p, l, 4); p += 4;
131 memset(final, 0, sizeof(final));