Mercurial > dropbear
view libtomcrypt/src/encauth/ocb/ocb_encrypt.c @ 1693:f9ad4d39e388
Bring back -Werror and improve travis tests
author | Matt Johnston <matt@ucc.asn.au> |
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date | Tue, 26 May 2020 23:53:50 +0800 |
parents | 6dba84798cd5 |
children |
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/* LibTomCrypt, modular cryptographic library -- Tom St Denis * * LibTomCrypt is a library that provides various cryptographic * algorithms in a highly modular and flexible manner. * * The library is free for all purposes without any express * guarantee it works. */ /** @file ocb_encrypt.c OCB implementation, encrypt data, by Tom St Denis */ #include "tomcrypt.h" #ifdef LTC_OCB_MODE /** Encrypt a block of data with OCB. @param ocb The OCB state @param pt The plaintext (length of the block size of the block cipher) @param ct [out] The ciphertext (same size as the pt) @return CRYPT_OK if successful */ int ocb_encrypt(ocb_state *ocb, const unsigned char *pt, unsigned char *ct) { unsigned char Z[MAXBLOCKSIZE], tmp[MAXBLOCKSIZE]; int err, x; LTC_ARGCHK(ocb != NULL); LTC_ARGCHK(pt != NULL); LTC_ARGCHK(ct != NULL); if ((err = cipher_is_valid(ocb->cipher)) != CRYPT_OK) { return err; } if (ocb->block_len != cipher_descriptor[ocb->cipher].block_length) { return CRYPT_INVALID_ARG; } /* compute checksum */ for (x = 0; x < ocb->block_len; x++) { ocb->checksum[x] ^= pt[x]; } /* Get Z[i] value */ ocb_shift_xor(ocb, Z); /* xor pt in, encrypt, xor Z out */ for (x = 0; x < ocb->block_len; x++) { tmp[x] = pt[x] ^ Z[x]; } if ((err = cipher_descriptor[ocb->cipher].ecb_encrypt(tmp, ct, &ocb->key)) != CRYPT_OK) { return err; } for (x = 0; x < ocb->block_len; x++) { ct[x] ^= Z[x]; } #ifdef LTC_CLEAN_STACK zeromem(Z, sizeof(Z)); zeromem(tmp, sizeof(tmp)); #endif return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */