diff options
| -rw-r--r-- | epan/crypt-md5.c | 63 | ||||
| -rw-r--r-- | epan/crypt-md5.h | 3 |
2 files changed, 66 insertions, 0 deletions
diff --git a/epan/crypt-md5.c b/epan/crypt-md5.c index 42df1b920d..01931fdc4c 100644 --- a/epan/crypt-md5.c +++ b/epan/crypt-md5.c @@ -56,6 +56,7 @@ #endif #include <string.h> +#include <glib.h> /* for g_malloc() */ #include <epan/crypt-md5.h> @@ -384,3 +385,65 @@ md5_finish(md5_state_t *pms, md5_byte_t digest[16]) for (i = 0; i < 16; ++i) digest[i] = (md5_byte_t)(pms->abcd[i >> 2] >> ((i & 3) << 3)); } + +static void +md5_checksum(const md5_byte_t *data, + int len, + md5_byte_t digest[16]) +{ + md5_state_t ms; + + md5_init(&ms); + md5_append(&ms, data, len); + md5_finish(&ms, digest); +} + +void +md5_hmac(const md5_byte_t *data, + int len, + md5_byte_t *key_data, + int key_length, + md5_byte_t digest[16]) +{ + md5_byte_t *ipad; + md5_byte_t *key; + md5_byte_t opad[80]; + int key_len; + int i; + + ipad = g_malloc(64 + len); + if (ipad == NULL) + g_assert_not_reached(); + + memset(ipad, 0x36, 64); + memset(opad, 0x5c, 64); + + if(key_length > 65){ + md5_checksum( + key_data, + key_length, + digest); + key = digest; + key_len = 16; + } else { + key = key_data; + key_len = key_length; + } + for(i = 0; i < key_len; i++){ + ipad[i] ^= key[i]; + opad[i] ^= key[i]; + } + memcpy(ipad + 64, data, len); + md5_checksum( + ipad, + 64+len, + digest); + memcpy(opad + 64, digest, + 16); + md5_checksum( + opad, + 64+16, + digest); + g_free(ipad); +} + diff --git a/epan/crypt-md5.h b/epan/crypt-md5.h index 5eb6d6c469..8581c90f0a 100644 --- a/epan/crypt-md5.h +++ b/epan/crypt-md5.h @@ -84,6 +84,9 @@ void md5_append(md5_state_t *pms, const md5_byte_t *data, int nbytes); /* Finish the message and return the digest. */ void md5_finish(md5_state_t *pms, md5_byte_t digest[16]); + /* compute the MD5 HMAC */ +void md5_hmac(const md5_byte_t *data, int len, md5_byte_t *key_data, int key_length, md5_byte_t digest[16]); + #ifdef __cplusplus } /* end extern "C" */ #endif |