?? ofb_encrypt.c
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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, tomstdenis@iahu.ca, http://libtomcrypt.org */#include "mycrypt.h"#ifdef OFBint 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
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