Mercurial > dropbear
view libtomcrypt/src/modes/ofb/ofb_start.c @ 1938:77bc00dcc19f default tip main master
Bump version to 2022.82
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 01 Apr 2022 14:43:27 +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. */ #include "tomcrypt.h" /** @file ofb_start.c OFB implementation, start chain, Tom St Denis */ #ifdef LTC_OFB_MODE /** Initialize a OFB context @param cipher The index of the cipher desired @param IV The initialization vector @param key The secret key @param keylen The length of the secret key (octets) @param num_rounds Number of rounds in the cipher desired (0 for default) @param ofb The OFB state to initialize @return CRYPT_OK if successful */ int ofb_start(int cipher, const unsigned char *IV, const unsigned char *key, int keylen, int num_rounds, symmetric_OFB *ofb) { int x, err; LTC_ARGCHK(IV != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(ofb != NULL); if ((err = cipher_is_valid(cipher)) != CRYPT_OK) { return err; } /* copy details */ ofb->cipher = cipher; ofb->blocklen = cipher_descriptor[cipher].block_length; for (x = 0; x < ofb->blocklen; x++) { ofb->IV[x] = IV[x]; } /* init the cipher */ ofb->padlen = ofb->blocklen; return cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ofb->key); } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */