diff options
Diffstat (limited to 'libtomcrypt/src/encauth/ocb/s_ocb_done.c')
| -rw-r--r-- | libtomcrypt/src/encauth/ocb/s_ocb_done.c | 24 |
1 files changed, 11 insertions, 13 deletions
diff --git a/libtomcrypt/src/encauth/ocb/s_ocb_done.c b/libtomcrypt/src/encauth/ocb/s_ocb_done.c index 37a7cb7..e0501ed 100644 --- a/libtomcrypt/src/encauth/ocb/s_ocb_done.c +++ b/libtomcrypt/src/encauth/ocb/s_ocb_done.c @@ -5,11 +5,9 @@ * * The library is free for all purposes without any express * guarantee it works. - * - * Tom St Denis, tomstdenis@gmail.com, http://libtom.org */ -/** +/** @file s_ocb_done.c OCB implementation, internal helper, by Tom St Denis */ @@ -22,7 +20,7 @@ * is we XOR the final ciphertext into the checksum so we have to xor it * before we CTR [decrypt] or after [encrypt] * - * the names pt/ptlen/ct really just mean in/inlen/out but this is the way I wrote it... + * the names pt/ptlen/ct really just mean in/inlen/out but this is the way I wrote it... */ /** @@ -74,13 +72,13 @@ int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, } /* compute X[m] = len(pt[m]) XOR Lr XOR Z[m] */ - ocb_shift_xor(ocb, X); + ocb_shift_xor(ocb, X); XMEMCPY(Z, X, ocb->block_len); X[ocb->block_len-1] ^= (ptlen*8)&255; X[ocb->block_len-2] ^= ((ptlen*8)>>8)&255; for (x = 0; x < ocb->block_len; x++) { - X[x] ^= ocb->Lr[x]; + X[x] ^= ocb->Lr[x]; } /* Y[m] = E(X[m])) */ @@ -93,7 +91,7 @@ int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, /* xor C[m] into checksum */ for (x = 0; x < (int)ptlen; x++) { ocb->checksum[x] ^= ct[x]; - } + } } /* C[m] = P[m] xor Y[m] */ @@ -102,7 +100,7 @@ int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, } if (mode == 0) { - /* encrypt mode */ + /* encrypt mode */ /* xor C[m] into checksum */ for (x = 0; x < (int)ptlen; x++) { ocb->checksum[x] ^= ct[x]; @@ -113,7 +111,7 @@ int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, for (x = 0; x < ocb->block_len; x++) { ocb->checksum[x] ^= Y[x] ^ Z[x]; } - + /* encrypt checksum, er... tag!! */ if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(ocb->checksum, X, &ocb->key)) != CRYPT_OK) { goto error; @@ -132,7 +130,7 @@ int s_ocb_done(ocb_state *ocb, const unsigned char *pt, unsigned long ptlen, zeromem(Z, MAXBLOCKSIZE); zeromem(ocb, sizeof(*ocb)); #endif -error: +error: XFREE(X); XFREE(Y); XFREE(Z); @@ -143,6 +141,6 @@ error: #endif -/* $Source$ */ -/* $Revision$ */ -/* $Date$ */ +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |