diff options
Diffstat (limited to 'src/lib/crypto/old/old_decrypt.c')
| -rw-r--r-- | src/lib/crypto/old/old_decrypt.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/src/lib/crypto/old/old_decrypt.c b/src/lib/crypto/old/old_decrypt.c index 1bcb0d38b..bfbe56a10 100644 --- a/src/lib/crypto/old/old_decrypt.c +++ b/src/lib/crypto/old/old_decrypt.c @@ -45,7 +45,7 @@ krb5_old_decrypt(enc, hash, key, usage, ivec, input, arg_output) { krb5_error_code ret; size_t blocksize, hashsize, plainsize; - unsigned char *cksumdata; + unsigned char *cksumdata, *cn; krb5_data output, cksum, crcivec; int alloced; @@ -82,6 +82,17 @@ krb5_old_decrypt(enc, hash, key, usage, ivec, input, arg_output) /* decrypt it */ + /* save last ciphertext block in case we decrypt in place */ + if (ivec != NULL && ivec->length == blocksize) { + cn = malloc(blocksize); + if (cn == NULL) { + ret = ENOMEM; + goto cleanup; + } + memcpy(cn, input->data + input->length - blocksize, blocksize); + } else + cn = NULL; + /* XXX this is gross, but I don't have much choice */ if ((key->enctype == ENCTYPE_DES_CBC_CRC) && (ivec == 0)) { crcivec.length = key->length; @@ -119,6 +130,10 @@ krb5_old_decrypt(enc, hash, key, usage, ivec, input, arg_output) } arg_output->length = plainsize; + /* update ivec */ + if (cn != NULL) + memcpy(ivec->data, cn, blocksize); + ret = 0; cleanup: @@ -127,6 +142,8 @@ cleanup: free(output.data); } + if (cn != NULL) + free(cn); memset(cksumdata, 0, hashsize); free(cksumdata); return(ret); |