diff options
Diffstat (limited to 'src/lib/crypto/dk/dk_encrypt.c')
| -rw-r--r-- | src/lib/crypto/dk/dk_encrypt.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/src/lib/crypto/dk/dk_encrypt.c b/src/lib/crypto/dk/dk_encrypt.c index 8627353..2bc2b6b 100644 --- a/src/lib/crypto/dk/dk_encrypt.c +++ b/src/lib/crypto/dk/dk_encrypt.c @@ -65,7 +65,7 @@ krb5_dk_encrypt(enc, hash, key, usage, ivec, input, output) krb5_error_code ret; unsigned char constantdata[K5CLENGTH]; krb5_data d1, d2; - unsigned char *plaintext, *kedata, *kidata; + unsigned char *plaintext, *kedata, *kidata, *cn; krb5_keyblock ke, ki; /* allocate and set up plaintext and to-be-derived keys */ @@ -142,6 +142,11 @@ krb5_dk_encrypt(enc, hash, key, usage, ivec, input, output) if ((ret = ((*(enc->encrypt))(&ke, ivec, &d1, &d2)))) goto cleanup; + if (ivec != NULL && ivec->length == blocksize) + cn = d2.data + d2.length - blocksize; + else + cn = NULL; + /* hash the plaintext */ d2.length = enclen - plainlen; @@ -149,8 +154,14 @@ krb5_dk_encrypt(enc, hash, key, usage, ivec, input, output) output->length = enclen; - if ((ret = krb5_hmac(hash, &ki, 1, &d1, &d2))) + if ((ret = krb5_hmac(hash, &ki, 1, &d1, &d2))) { memset(d2.data, 0, d2.length); + goto cleanup; + } + + /* update ivec */ + if (cn != NULL) + memcpy(ivec->data, cn, blocksize); /* ret is set correctly by the prior call */ @@ -196,7 +207,7 @@ krb5_marc_dk_encrypt(enc, hash, key, usage, ivec, input, output) krb5_error_code ret; unsigned char constantdata[K5CLENGTH]; krb5_data d1, d2; - unsigned char *plaintext, *kedata, *kidata; + unsigned char *plaintext, *kedata, *kidata, *cn; krb5_keyblock ke, ki; /* allocate and set up plaintext and to-be-derived keys */ @@ -278,6 +289,11 @@ krb5_marc_dk_encrypt(enc, hash, key, usage, ivec, input, output) if ((ret = ((*(enc->encrypt))(&ke, ivec, &d1, &d2)))) goto cleanup; + if (ivec != NULL && ivec->length == blocksize) + cn = d2.data + d2.length - blocksize; + else + cn = NULL; + /* hash the plaintext */ d2.length = enclen - plainlen; @@ -285,8 +301,14 @@ krb5_marc_dk_encrypt(enc, hash, key, usage, ivec, input, output) output->length = enclen; - if ((ret = krb5_hmac(hash, &ki, 1, &d1, &d2))) + if ((ret = krb5_hmac(hash, &ki, 1, &d1, &d2))) { memset(d2.data, 0, d2.length); + goto cleanup; + } + + /* update ivec */ + if (cn != NULL) + memcpy(ivec->data, cn, blocksize); /* ret is set correctly by the prior call */ |