| /* 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@gmail.com, http://libtomcrypt.org |
| */ |
| #include "tomcrypt.h" |
| |
| /** |
| @file rsa_import.c |
| Import a PKCS RSA key, Tom St Denis |
| */ |
| |
| #ifdef MRSA |
| |
| /** |
| Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1] |
| @param in The packet to import from |
| @param inlen It's length (octets) |
| @param key [out] Destination for newly imported key |
| @return CRYPT_OK if successful, upon error allocated memory is freed |
| */ |
| int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) |
| { |
| int err; |
| mp_int zero; |
| |
| LTC_ARGCHK(in != NULL); |
| LTC_ARGCHK(key != NULL); |
| |
| /* init key */ |
| if ((err = mp_init_multi(&zero, &key->e, &key->d, &key->N, &key->dQ, |
| &key->dP, &key->qP, &key->p, &key->q, NULL)) != MP_OKAY) { |
| return mpi_to_ltc_error(err); |
| } |
| |
| if ((err = der_decode_sequence_multi(in, inlen, |
| LTC_ASN1_INTEGER, 1UL, &key->N, |
| LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| if (mp_cmp_d(&key->N, 0) == MP_EQ) { |
| /* it's a private key */ |
| if ((err = der_decode_sequence_multi(in, inlen, |
| LTC_ASN1_INTEGER, 1UL, &zero, |
| LTC_ASN1_INTEGER, 1UL, &key->N, |
| LTC_ASN1_INTEGER, 1UL, &key->e, |
| LTC_ASN1_INTEGER, 1UL, &key->d, |
| LTC_ASN1_INTEGER, 1UL, &key->p, |
| LTC_ASN1_INTEGER, 1UL, &key->q, |
| LTC_ASN1_INTEGER, 1UL, &key->dP, |
| LTC_ASN1_INTEGER, 1UL, &key->dQ, |
| LTC_ASN1_INTEGER, 1UL, &key->qP, |
| LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| key->type = PK_PRIVATE; |
| } else if (mp_cmp_d(&key->N, 1) == MP_EQ) { |
| /* we don't support multi-prime RSA */ |
| err = CRYPT_PK_INVALID_TYPE; |
| goto LBL_ERR; |
| } else { |
| /* it's a public key and we lack e */ |
| if ((err = der_decode_sequence_multi(in, inlen, |
| LTC_ASN1_INTEGER, 1UL, &key->N, |
| LTC_ASN1_INTEGER, 1UL, &key->e, |
| LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) { |
| goto LBL_ERR; |
| } |
| |
| /* free up some ram */ |
| mp_clear_multi(&key->p, &key->q, &key->qP, &key->dP, &key->dQ, NULL); |
| key->type = PK_PUBLIC; |
| } |
| return CRYPT_OK; |
| LBL_ERR: |
| mp_clear_multi(&zero, &key->d, &key->e, &key->N, &key->dQ, &key->dP, |
| &key->qP, &key->p, &key->q, NULL); |
| return err; |
| } |
| |
| #endif /* MRSA */ |
| |
| |
| /* $Source: /cvs/libtom/libtomcrypt/src/pk/rsa/rsa_import.c,v $ */ |
| /* $Revision: 1.10 $ */ |
| /* $Date: 2005/06/03 18:48:28 $ */ |