Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_export.c @ 1665:7c17995bcdfb

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Improve address logging on early exit messages (#83) Change 'Early exit' and 'Exit before auth' messages to include the IP address & port as part of the message. This allows log scanning utilities such as 'fail2ban' to obtain the offending IP address as part of the failure event instead of extracting the PID from the message and then scanning the log again for match 'child connection from' messages Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com>
date Wed, 18 Mar 2020 15:28:56 +0000
parents 6dba84798cd5
children e9dba7abd939
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 #include "tomcrypt.h"
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10
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11 /**
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12 @file rsa_export.c
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13 Export RSA PKCS keys, Tom St Denis
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14 */
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15
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16 #ifdef LTC_MRSA
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18 /**
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19 This will export either an RSAPublicKey or RSAPrivateKey [defined in PKCS #1 v2.1]
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20 @param out [out] Destination of the packet
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21 @param outlen [in/out] The max size and resulting size of the packet
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22 @param type The type of exported key (PK_PRIVATE or PK_PUBLIC)
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23 @param key The RSA key to export
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24 @return CRYPT_OK if successful
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25 */
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26 int rsa_export(unsigned char *out, unsigned long *outlen, int type, rsa_key *key)
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27 {
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28 unsigned long zero=0;
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29 int err;
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30 LTC_ARGCHK(out != NULL);
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31 LTC_ARGCHK(outlen != NULL);
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32 LTC_ARGCHK(key != NULL);
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34 /* type valid? */
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35 if (!(key->type == PK_PRIVATE) && (type == PK_PRIVATE)) {
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36 return CRYPT_PK_INVALID_TYPE;
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37 }
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38
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39 if (type == PK_PRIVATE) {
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40 /* private key */
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41 /* output is
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42 Version, n, e, d, p, q, d mod (p-1), d mod (q - 1), 1/q mod p
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43 */
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44 return der_encode_sequence_multi(out, outlen,
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45 LTC_ASN1_SHORT_INTEGER, 1UL, &zero,
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46 LTC_ASN1_INTEGER, 1UL, key->N,
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47 LTC_ASN1_INTEGER, 1UL, key->e,
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48 LTC_ASN1_INTEGER, 1UL, key->d,
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49 LTC_ASN1_INTEGER, 1UL, key->p,
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50 LTC_ASN1_INTEGER, 1UL, key->q,
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51 LTC_ASN1_INTEGER, 1UL, key->dP,
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52 LTC_ASN1_INTEGER, 1UL, key->dQ,
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53 LTC_ASN1_INTEGER, 1UL, key->qP,
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54 LTC_ASN1_EOL, 0UL, NULL);
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55 } else {
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56 /* public key */
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57 unsigned long tmplen, *ptmplen;
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58 unsigned char* tmp = NULL;
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59
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60 if (type & PK_STD) {
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61 tmplen = (mp_count_bits(key->N)/8)*2+8;
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62 tmp = XMALLOC(tmplen);
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63 ptmplen = &tmplen;
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64 if (tmp == NULL) {
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65 return CRYPT_MEM;
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66 }
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67 }
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68 else {
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69 tmp = out;
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70 ptmplen = outlen;
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71 }
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72
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73 err = der_encode_sequence_multi(tmp, ptmplen,
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74 LTC_ASN1_INTEGER, 1UL, key->N,
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75 LTC_ASN1_INTEGER, 1UL, key->e,
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76 LTC_ASN1_EOL, 0UL, NULL);
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77
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78 if ((err != CRYPT_OK) || !(type & PK_STD)) {
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79 goto finish;
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80 }
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81
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82 err = der_encode_subject_public_key_info(out, outlen,
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83 PKA_RSA, tmp, tmplen, LTC_ASN1_NULL, NULL, 0);
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84
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85 finish:
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86 if (tmp != out)
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87 XFREE(tmp);
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88 return err;
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89
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90 }
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91 }
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92
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93 #endif /* LTC_MRSA */
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94
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95 /* ref: $Format:%D$ */
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96 /* git commit: $Format:%H$ */
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97 /* commit time: $Format:%ai$ */