Mercurial > dropbear

annotate libtomcrypt/src/pk/rsa/rsa_export.c @ 1844:7a3cd7b598d8

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author Matt Johnston <matt@ucc.asn.au>
date Mon, 18 Oct 2021 23:31:23 +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: $Format:%ai$ */