Mercurial > dropbear
view ofb_encrypt.c @ 154:b4c6e7f276e9 libtomcrypt
Makefile.in: don't compile things we don't need
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 20 Dec 2004 14:46:40 +0000 |
parents | d7da3b1e1540 |
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. * * Tom St Denis, [email protected], http://libtomcrypt.org */ #include "mycrypt.h" #ifdef OFB int ofb_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_OFB *ofb) { int err; _ARGCHK(pt != NULL); _ARGCHK(ct != NULL); _ARGCHK(ofb != NULL); if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) { return err; } /* is blocklen/padlen valid? */ if (ofb->blocklen < 0 || ofb->blocklen > (int)sizeof(ofb->IV) || ofb->padlen < 0 || ofb->padlen > (int)sizeof(ofb->IV)) { return CRYPT_INVALID_ARG; } while (len-- > 0) { if (ofb->padlen == ofb->blocklen) { cipher_descriptor[ofb->cipher].ecb_encrypt(ofb->IV, ofb->IV, &ofb->key); ofb->padlen = 0; } *ct++ = *pt++ ^ ofb->IV[ofb->padlen++]; } return CRYPT_OK; } #endif