| 1 | /* |
| 2 | ** Copyright 1998 - 1999 Double Precision, Inc. |
| 3 | ** See COPYING for distribution information. |
| 4 | */ |
| 5 | |
| 6 | #if HAVE_CONFIG_H |
| 7 | #include "config.h" |
| 8 | #endif |
| 9 | |
| 10 | #include "hmac.h" |
| 11 | |
| 12 | |
| 13 | struct hmac_hashinfo *hmac_list[]= {HMAC_LIST}; |
| 14 | |
| 15 | struct hhki { |
| 16 | const struct hmac_hashinfo *hh; |
| 17 | const char *k; |
| 18 | size_t kl; |
| 19 | unsigned char *kxopad; |
| 20 | unsigned char *kxipad; |
| 21 | |
| 22 | void *context; |
| 23 | } ; |
| 24 | |
| 25 | static void dohashkey(unsigned char *, void *); |
| 26 | static void docalcc(void *, void *); |
| 27 | |
| 28 | void hmac_hashkey(const struct hmac_hashinfo *hh, const char *k, |
| 29 | size_t kl, unsigned char *kxopad, unsigned char *kxipad) |
| 30 | { |
| 31 | struct hhki i; |
| 32 | |
| 33 | i.hh=hh; |
| 34 | i.k=k; |
| 35 | i.kl=kl; |
| 36 | i.kxopad=kxopad; |
| 37 | i.kxipad=kxipad; |
| 38 | |
| 39 | (*hh->hh_allocacontext)( docalcc, (void *)&i ); |
| 40 | } |
| 41 | |
| 42 | static void dokeycalc(struct hhki *); |
| 43 | |
| 44 | static void docalcc(void *c, void *v) |
| 45 | { |
| 46 | struct hhki *i=(struct hhki *)v; |
| 47 | |
| 48 | i->context=c; |
| 49 | |
| 50 | if (i->kl > i->hh->hh_B) |
| 51 | (*i->hh->hh_allocaval)(dohashkey, (void *)i); |
| 52 | else |
| 53 | dokeycalc( i ); |
| 54 | } |
| 55 | |
| 56 | static void dohashkey(unsigned char *keybuf, void *v) |
| 57 | { |
| 58 | struct hhki *i=(struct hhki *)v; |
| 59 | |
| 60 | (*i->hh->hh_init)(i->context); |
| 61 | (*i->hh->hh_hash)(i->context, i->k, i->kl); |
| 62 | (*i->hh->hh_endhash)(i->context, i->kl); |
| 63 | (*i->hh->hh_getdigest)(i->context, keybuf); |
| 64 | i->k=(char *)keybuf; |
| 65 | i->kl=i->hh->hh_L; |
| 66 | dokeycalc(i); |
| 67 | } |
| 68 | |
| 69 | static void dokeycalc(struct hhki *i) |
| 70 | { |
| 71 | char buf[64]; /* Random guess :-) */ |
| 72 | unsigned n; |
| 73 | unsigned l; |
| 74 | |
| 75 | (*i->hh->hh_init)(i->context); |
| 76 | n=0; |
| 77 | for (l=0; l<i->hh->hh_B; l++) |
| 78 | { |
| 79 | buf[n] = ( l < i->kl ? i->k[l]:0) ^ 0x5C; |
| 80 | if ( ++n >= sizeof(buf)) |
| 81 | { |
| 82 | (*i->hh->hh_hash)(i->context, buf, sizeof(buf)); |
| 83 | n=0; |
| 84 | } |
| 85 | } |
| 86 | if (n) |
| 87 | (*i->hh->hh_hash)(i->context, buf, n); |
| 88 | (*i->hh->hh_getdigest)(i->context, i->kxopad); |
| 89 | |
| 90 | (*i->hh->hh_init)(i->context); |
| 91 | n=0; |
| 92 | for (l=0; l<i->hh->hh_B; l++) |
| 93 | { |
| 94 | buf[n] = ( l < i->kl ? i->k[l]:0) ^ 0x36; |
| 95 | if ( ++n >= sizeof(buf)) |
| 96 | { |
| 97 | (*i->hh->hh_hash)(i->context, buf, sizeof(buf)); |
| 98 | n=0; |
| 99 | } |
| 100 | } |
| 101 | if (n) |
| 102 | (*i->hh->hh_hash)(i->context, buf, n); |
| 103 | (*i->hh->hh_getdigest)(i->context, i->kxipad); |
| 104 | } |
| 105 | |
| 106 | struct hhko { |
| 107 | const struct hmac_hashinfo *hh; |
| 108 | const char *t; |
| 109 | size_t tl; |
| 110 | const unsigned char *kxopad; |
| 111 | const unsigned char *kxipad; |
| 112 | unsigned char *hash; |
| 113 | } ; |
| 114 | |
| 115 | static void docalch(void *, void *); |
| 116 | |
| 117 | void hmac_hashtext ( |
| 118 | const struct hmac_hashinfo *hh, |
| 119 | const char *t, |
| 120 | size_t tl, |
| 121 | const unsigned char *kxopad, |
| 122 | const unsigned char *kxipad, |
| 123 | unsigned char *hash) |
| 124 | { |
| 125 | struct hhko o; |
| 126 | |
| 127 | o.hh=hh; |
| 128 | o.t=t; |
| 129 | o.tl=tl; |
| 130 | o.kxopad=kxopad; |
| 131 | o.kxipad=kxipad; |
| 132 | o.hash=hash; |
| 133 | |
| 134 | (*hh->hh_allocacontext)( docalch, (void *)&o ); |
| 135 | } |
| 136 | |
| 137 | static void docalch(void *c, void *v) |
| 138 | { |
| 139 | struct hhko *o=(struct hhko *)v; |
| 140 | |
| 141 | (o->hh->hh_setdigest)(c, o->kxipad); |
| 142 | (o->hh->hh_hash)(c, o->t, o->tl); |
| 143 | (o->hh->hh_endhash)(c, o->tl+o->hh->hh_B); |
| 144 | (o->hh->hh_getdigest)(c, o->hash); |
| 145 | |
| 146 | (o->hh->hh_setdigest)(c, o->kxopad); |
| 147 | (o->hh->hh_hash)(c, o->hash, o->hh->hh_L); |
| 148 | (o->hh->hh_endhash)(c, o->hh->hh_L + o->hh->hh_B); |
| 149 | (o->hh->hh_getdigest)(c, o->hash); |
| 150 | } |