Mercurial > dropbear
view libtomcrypt/src/pk/dh/dh_import.c @ 1706:3f80da5fe0b4
Remove unused DEBUG_FORKGPROF
author | Matt Johnston <matt@ucc.asn.au> |
---|---|
date | Fri, 29 May 2020 23:32:19 +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" #ifdef LTC_MDH /** Import a DH key from a binary packet @param in The packet to read @param inlen The length of the input packet @param key [out] Where to import the key to @return CRYPT_OK if successful, on error all allocated memory is freed automatically */ int dh_import(const unsigned char *in, unsigned long inlen, dh_key *key) { unsigned char flags[1]; int err; unsigned long version; LTC_ARGCHK(in != NULL); LTC_ARGCHK(key != NULL); /* init */ if ((err = mp_init_multi(&key->x, &key->y, &key->base, &key->prime, NULL)) != CRYPT_OK) { return err; } /* find out what type of key it is */ err = der_decode_sequence_multi(in, inlen, LTC_ASN1_SHORT_INTEGER, 1UL, &version, LTC_ASN1_BIT_STRING, 1UL, &flags, LTC_ASN1_EOL, 0UL, NULL); if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) { goto error; } if (version == 0) { if (flags[0] == 1) { key->type = PK_PRIVATE; if ((err = der_decode_sequence_multi(in, inlen, LTC_ASN1_SHORT_INTEGER, 1UL, &version, LTC_ASN1_BIT_STRING, 1UL, flags, LTC_ASN1_INTEGER, 1UL, key->prime, LTC_ASN1_INTEGER, 1UL, key->base, LTC_ASN1_INTEGER, 1UL, key->x, LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { goto error; } /* compute public key: y = (base ^ x) mod prime */ if ((err = mp_exptmod(key->base, key->x, key->prime, key->y)) != CRYPT_OK) { goto error; } } else if (flags[0] == 0) { key->type = PK_PUBLIC; if ((err = der_decode_sequence_multi(in, inlen, LTC_ASN1_SHORT_INTEGER, 1UL, &version, LTC_ASN1_BIT_STRING, 1UL, flags, LTC_ASN1_INTEGER, 1UL, key->prime, LTC_ASN1_INTEGER, 1UL, key->base, LTC_ASN1_INTEGER, 1UL, key->y, LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { goto error; } } else { err = CRYPT_INVALID_PACKET; goto error; } } else { err = CRYPT_INVALID_PACKET; goto error; } /* check public key */ if ((err = dh_check_pubkey(key)) != CRYPT_OK) { goto error; } return CRYPT_OK; error: dh_free(key); return err; } #endif /* LTC_MDH */ /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */