Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_export.c @ 1902:4a6725ac957c

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Revert "Don't include sk keys at all in KEX list" This reverts git commit f972813ecdc7bb981d25b5a63638bd158f1c8e72. The sk algorithms need to remain in the sigalgs list so that they are included in the server-sig-algs ext-info message sent by the server. RFC8308 for server-sig-algs requires that all algorithms are listed (though OpenSSH client 8.4p1 tested doesn't require that)
author Matt Johnston <matt@ucc.asn.au>
date Thu, 24 Mar 2022 13:42:08 +0800
parents e9dba7abd939
children
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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 = (unsigned long)(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: $Format:%ai$ */