Mercurial > dropbear
view libtomcrypt/src/encauth/gcm/gcm_add_iv.c @ 1638:315fcba6960e
dropbearconvert: keyimport.c: fix BER encoding of secp521r1 keys (#69)
keysizes >= 128 octets will be encoded with a 3 byte header
which must be accounted by the optional-header
Reproduce:
master:~/build/dropbear$ ./dropbearkey -t ecdsa -s 521 -f K
Generating 521 bit ecdsa key, this may take a while...
master:~/build/dropbear$ ./dropbearconvert d o K L
Key is a ecdsa-sha2-nistp521 key
Wrote key to 'L'
master:~/build/dropbear$ openssl ec < L
read EC key
unable to load Key
139769806448384:error:0D07209B:asn1 encoding routines:ASN1_get_object:too long:crypto/asn1/asn1_lib.c:91:
author | Christian Hohnstädt <christian@hohnstaedt.de> |
---|---|
date | Wed, 20 Mar 2019 16:42:47 +0100 |
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 gcm_add_iv.c GCM implementation, add IV data to the state, by Tom St Denis */ #include "tomcrypt.h" #ifdef LTC_GCM_MODE /** Add IV data to the GCM state @param gcm The GCM state @param IV The initial value data to add @param IVlen The length of the IV @return CRYPT_OK on success */ int gcm_add_iv(gcm_state *gcm, const unsigned char *IV, unsigned long IVlen) { unsigned long x, y; int err; LTC_ARGCHK(gcm != NULL); if (IVlen > 0) { LTC_ARGCHK(IV != NULL); } /* must be in IV mode */ if (gcm->mode != LTC_GCM_MODE_IV) { return CRYPT_INVALID_ARG; } if (gcm->buflen >= 16 || gcm->buflen < 0) { return CRYPT_INVALID_ARG; } if ((err = cipher_is_valid(gcm->cipher)) != CRYPT_OK) { return err; } /* trip the ivmode flag */ if (IVlen + gcm->buflen > 12) { gcm->ivmode |= 1; } x = 0; #ifdef LTC_FAST if (gcm->buflen == 0) { for (x = 0; x < (IVlen & ~15); x += 16) { for (y = 0; y < 16; y += sizeof(LTC_FAST_TYPE)) { *(LTC_FAST_TYPE_PTR_CAST(&gcm->X[y])) ^= *(LTC_FAST_TYPE_PTR_CAST(&IV[x + y])); } gcm_mult_h(gcm, gcm->X); gcm->totlen += 128; } IV += x; } #endif /* start adding IV data to the state */ for (; x < IVlen; x++) { gcm->buf[gcm->buflen++] = *IV++; if (gcm->buflen == 16) { /* GF mult it */ for (y = 0; y < 16; y++) { gcm->X[y] ^= gcm->buf[y]; } gcm_mult_h(gcm, gcm->X); gcm->buflen = 0; gcm->totlen += 128; } } return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */