Mercurial > dropbear
annotate libtomcrypt/src/pk/rsa/rsa_import.c @ 740:3062da90dab8 kexguess
Add kexguess2 behaviour
author | Matt Johnston <matt@ucc.asn.au> |
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date | Fri, 29 Mar 2013 23:29:48 +0800 |
parents | 0cbe8f6dbf9e |
children | f849a5ca2efc |
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1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
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2 * |
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3 * LibTomCrypt is a library that provides various cryptographic |
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4 * algorithms in a highly modular and flexible manner. |
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5 * |
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6 * The library is free for all purposes without any express |
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7 * guarantee it works. |
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8 * |
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9 * Tom St Denis, [email protected], http://libtomcrypt.com |
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10 */ |
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11 #include "tomcrypt.h" |
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12 |
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13 /** |
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14 @file rsa_import.c |
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15 Import a PKCS RSA key, Tom St Denis |
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16 */ |
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17 |
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18 #ifdef MRSA |
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19 |
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20 /** |
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21 Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1] |
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22 @param in The packet to import from |
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23 @param inlen It's length (octets) |
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24 @param key [out] Destination for newly imported key |
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25 @return CRYPT_OK if successful, upon error allocated memory is freed |
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26 */ |
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27 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key) |
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28 { |
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29 int err; |
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30 void *zero; |
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31 unsigned char *tmpbuf; |
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32 unsigned long t, x, y, z, tmpoid[16]; |
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33 ltc_asn1_list ssl_pubkey_hashoid[2]; |
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34 ltc_asn1_list ssl_pubkey[2]; |
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35 |
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36 LTC_ARGCHK(in != NULL); |
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37 LTC_ARGCHK(key != NULL); |
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38 LTC_ARGCHK(ltc_mp.name != NULL); |
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39 |
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40 /* init key */ |
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41 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, |
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42 &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) { |
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43 return err; |
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44 } |
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45 |
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46 /* see if the OpenSSL DER format RSA public key will work */ |
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47 tmpbuf = XCALLOC(1, MAX_RSA_SIZE*8); |
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48 if (tmpbuf == NULL) { |
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49 err = CRYPT_MEM; |
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50 goto LBL_ERR; |
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51 } |
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52 |
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53 /* this includes the internal hash ID and optional params (NULL in this case) */ |
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54 LTC_SET_ASN1(ssl_pubkey_hashoid, 0, LTC_ASN1_OBJECT_IDENTIFIER, tmpoid, sizeof(tmpoid)/sizeof(tmpoid[0])); |
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55 LTC_SET_ASN1(ssl_pubkey_hashoid, 1, LTC_ASN1_NULL, NULL, 0); |
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56 |
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57 /* the actual format of the SSL DER key is odd, it stores a RSAPublicKey in a **BIT** string ... so we have to extract it |
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58 then proceed to convert bit to octet |
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59 */ |
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60 LTC_SET_ASN1(ssl_pubkey, 0, LTC_ASN1_SEQUENCE, &ssl_pubkey_hashoid, 2); |
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61 LTC_SET_ASN1(ssl_pubkey, 1, LTC_ASN1_BIT_STRING, tmpbuf, MAX_RSA_SIZE*8); |
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62 |
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63 if (der_decode_sequence(in, inlen, |
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64 ssl_pubkey, 2UL) == CRYPT_OK) { |
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65 |
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66 /* ok now we have to reassemble the BIT STRING to an OCTET STRING. Thanks OpenSSL... */ |
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