diff options
Diffstat (limited to 'src/lib/crypto/builtin/des/f_aead.c')
| -rw-r--r-- | src/lib/crypto/builtin/des/f_aead.c | 151 |
1 files changed, 76 insertions, 75 deletions
diff --git a/src/lib/crypto/builtin/des/f_aead.c b/src/lib/crypto/builtin/des/f_aead.c index 328d20a..8e700cd 100644 --- a/src/lib/crypto/builtin/des/f_aead.c +++ b/src/lib/crypto/builtin/des/f_aead.c @@ -1,3 +1,4 @@ +/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */ /* * Copyright (C) 2008 by the Massachusetts Institute of Technology. * Copyright 1995 by Richard P. Basch. All Rights Reserved. @@ -27,9 +28,9 @@ void krb5int_des_cbc_encrypt_iov(krb5_crypto_iov *data, - unsigned long num_data, - const mit_des_key_schedule schedule, - mit_des_cblock ivec) + unsigned long num_data, + const mit_des_key_schedule schedule, + mit_des_cblock ivec) { unsigned DES_INT32 left, right; const unsigned DES_INT32 *kp; @@ -52,9 +53,9 @@ krb5int_des_cbc_encrypt_iov(krb5_crypto_iov *data, * vector. */ if (ivec != NULL) - ip = ivec; + ip = ivec; else - ip = mit_des_zeroblock; + ip = mit_des_zeroblock; GET_HALF_BLOCK(left, ip); GET_HALF_BLOCK(right, ip); @@ -63,45 +64,45 @@ krb5int_des_cbc_encrypt_iov(krb5_crypto_iov *data, * at a time. */ for (;;) { - unsigned DES_INT32 temp; + unsigned DES_INT32 temp; - ip = iblock; - op = oblock; + ip = iblock; + op = oblock; - if (!krb5int_c_iov_get_block(iblock, MIT_DES_BLOCK_LENGTH, data, num_data, &input_pos)) - break; + if (!krb5int_c_iov_get_block(iblock, MIT_DES_BLOCK_LENGTH, data, num_data, &input_pos)) + break; - if (input_pos.iov_pos == num_data) - break; + if (input_pos.iov_pos == num_data) + break; - GET_HALF_BLOCK(temp, ip); - left ^= temp; - GET_HALF_BLOCK(temp, ip); - right ^= temp; + GET_HALF_BLOCK(temp, ip); + left ^= temp; + GET_HALF_BLOCK(temp, ip); + right ^= temp; - /* - * Encrypt what we have - */ - DES_DO_ENCRYPT(left, right, kp); + /* + * Encrypt what we have + */ + DES_DO_ENCRYPT(left, right, kp); - /* - * Copy the results out - */ - PUT_HALF_BLOCK(left, op); - PUT_HALF_BLOCK(right, op); + /* + * Copy the results out + */ + PUT_HALF_BLOCK(left, op); + PUT_HALF_BLOCK(right, op); - krb5int_c_iov_put_block(data, num_data, oblock, MIT_DES_BLOCK_LENGTH, &output_pos); + krb5int_c_iov_put_block(data, num_data, oblock, MIT_DES_BLOCK_LENGTH, &output_pos); } if (ivec != NULL) - memcpy(ivec, oblock, MIT_DES_BLOCK_LENGTH); + memcpy(ivec, oblock, MIT_DES_BLOCK_LENGTH); } void krb5int_des_cbc_decrypt_iov(krb5_crypto_iov *data, - unsigned long num_data, - const mit_des_key_schedule schedule, - mit_des_cblock ivec) + unsigned long num_data, + const mit_des_key_schedule schedule, + mit_des_cblock ivec) { unsigned DES_INT32 left, right; const unsigned DES_INT32 *kp; @@ -128,15 +129,15 @@ krb5int_des_cbc_decrypt_iov(krb5_crypto_iov *data, */ if (num_data == 0) - return; + return; /* * Prime the old cipher with ivec. */ if (ivec != NULL) - ip = ivec; + ip = ivec; else - ip = mit_des_zeroblock; + ip = mit_des_zeroblock; GET_HALF_BLOCK(ocipherl, ip); GET_HALF_BLOCK(ocipherr, ip); @@ -144,49 +145,49 @@ krb5int_des_cbc_decrypt_iov(krb5_crypto_iov *data, * Now do this in earnest until we run out of length. */ for (;;) { - /* - * Read a block from the input into left and - * right. Save this cipher block for later. - */ - - if (!krb5int_c_iov_get_block(iblock, MIT_DES_BLOCK_LENGTH, data, num_data, &input_pos)) - break; - - if (input_pos.iov_pos == num_data) - break; - - ip = iblock; - op = oblock; - - GET_HALF_BLOCK(left, ip); - GET_HALF_BLOCK(right, ip); - cipherl = left; - cipherr = right; - - /* - * Decrypt this. - */ - DES_DO_DECRYPT(left, right, kp); - - /* - * Xor with the old cipher to get plain - * text. Output 8 or less bytes of this. - */ - left ^= ocipherl; - right ^= ocipherr; - - PUT_HALF_BLOCK(left, op); - PUT_HALF_BLOCK(right, op); - - /* - * Save current cipher block here - */ - ocipherl = cipherl; - ocipherr = cipherr; - - krb5int_c_iov_put_block(data, num_data, oblock, MIT_DES_BLOCK_LENGTH, &output_pos); + /* + * Read a block from the input into left and + * right. Save this cipher block for later. + */ + + if (!krb5int_c_iov_get_block(iblock, MIT_DES_BLOCK_LENGTH, data, num_data, &input_pos)) + break; + + if (input_pos.iov_pos == num_data) + break; + + ip = iblock; + op = oblock; + + GET_HALF_BLOCK(left, ip); + GET_HALF_BLOCK(right, ip); + cipherl = left; + cipherr = right; + + /* + * Decrypt this. + */ + DES_DO_DECRYPT(left, right, kp); + + /* + * Xor with the old cipher to get plain + * text. Output 8 or less bytes of this. + */ + left ^= ocipherl; + right ^= ocipherr; + + PUT_HALF_BLOCK(left, op); + PUT_HALF_BLOCK(right, op); + + /* + * Save current cipher block here + */ + ocipherl = cipherl; + ocipherr = cipherr; + + krb5int_c_iov_put_block(data, num_data, oblock, MIT_DES_BLOCK_LENGTH, &output_pos); } if (ivec != NULL) - memcpy(ivec, oblock, MIT_DES_BLOCK_LENGTH); + memcpy(ivec, oblock, MIT_DES_BLOCK_LENGTH); } |