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add MD4

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adjust krb5_encrypt and krb5_decrypt to reality


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@2017 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Assar Westerlund
1997-07-07 09:49:43 +00:00
parent 6b1ad83a22
commit db5cadb051
1 changed files with 25 additions and 13 deletions
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38
lib/krb5/encrypt.c
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@@ -17,11 +17,20 @@ NULL_checksum(void *p, size_t len, void *result)
{
}
static void
MD4_checksum(void *p, size_t len, void *result)
{
struct md4 m;
md4_init(&m);
md4_update(&m, p, len);
md4_finito(&m, result);
}
static void
MD5_checksum(void *p, size_t len, void *result)
{
struct md5 m;
md5init(&m);
md5_init(&m);
md5_update(&m, p, len);
md5_finito(&m, result);
}
@@ -67,11 +76,12 @@ DES_encrypt(void *p, size_t len,
static void
DES3_encrypt(void *p, size_t len, const krb5_keyblock *keyblock, int encrypt)
{
abort ();
}
static struct encryption_type em [] = {
{ ETYPE_DES_CBC_CRC, 8, 8, 4, DES_encrypt, CRC_checksum },
{ ETYPE_DES_CBC_MD4, 8, 8, 16, DES_encrypt, MD4_checksum },
{ ETYPE_DES_CBC_MD5, 8, 8, 16, DES_encrypt, MD5_checksum },
{ ETYPE_NULL, 1, 0, 0, NULL_encrypt, NULL_checksum },
};
@@ -86,17 +96,16 @@ krb5_do_encrypt(krb5_context context,
krb5_keyblock *keyblock,
krb5_data *result)
{
size_t size;
size_t sz;
unsigned char *p;
size = len + et->confoundersize + et->checksumsize;
sz = (size + et->blocksize - 1) & ~ (et->blocksize - 1);
sz = len + et->confoundersize + et->checksumsize;
sz = (sz + et->blocksize - 1) & ~ (et->blocksize - 1);
p = calloc(1, sz);
if (p == NULL)
return ENOMEM;
des_rand_data(p, et->confoundersize);
memcpy(p + et->confoundersize + et->checksumsize, ptr, len);
(*et->checksum)(p, size, p + et->confoundersize);
(*et->checksum)(p, sz, p + et->confoundersize);
(*et->encrypt)(p, sz, keyblock, 1);
result->data = p;
result->length = sz;
@@ -113,20 +122,23 @@ krb5_do_decrypt(krb5_context context,
{
unsigned char *his_checksum;
unsigned char *p = ptr;
size_t length = 0; /* magic! */
size_t outlen;
(*et->encrypt)(ptr, len, keyblock, 0);
his_checksum = malloc(et->checksumsize);
memcpy(his_checksum, ptr + et->confoundersize, et->checksumsize);
memset(ptr + et->confoundersize, 0, et->checksumsize);
memcpy(his_checksum, p + et->confoundersize, et->checksumsize);
memset(p + et->confoundersize, 0, et->checksumsize);
(*et->checksum)(p, length, p + et->confoundersize);
(*et->checksum)(p, len, p + et->confoundersize);
if (memcmp(p + et->confoundersize, his_checksum, et->checksumsize))
return KRB5KRB_AP_ERR_BAD_INTEGRITY;
result->data = malloc(length);
outlen = len - et->confoundersize - et->checksumsize;
result->data = malloc(outlen);
if(result->data == NULL)
return ENOMEM;
result->length = length;
memcpy(result->data, p + et->confoundersize, et->checksumsize);
result->length = outlen;
memcpy(result->data, p + et->confoundersize + et->checksumsize, outlen);
return 0;
}