mirror of
https://github.com/Laupetin/OpenAssetTools.git
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130 lines
4.1 KiB
C
130 lines
4.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*/
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#include "tomcrypt.h"
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/**
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@file rsa_import.c
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Import a PKCS RSA key, Tom St Denis
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*/
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#ifdef LTC_MRSA
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/**
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Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
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@param in The packet to import from
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@param inlen It's length (octets)
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@param key [out] Destination for newly imported key
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@return CRYPT_OK if successful, upon error allocated memory is freed
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*/
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int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
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{
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int err;
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void *zero;
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unsigned char *tmpbuf=NULL;
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unsigned long tmpbuf_len;
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LTC_ARGCHK(in != NULL);
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LTC_ARGCHK(key != NULL);
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LTC_ARGCHK(ltc_mp.name != NULL);
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/* init key */
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if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ,
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&key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) {
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return err;
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}
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/* see if the OpenSSL DER format RSA public key will work */
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tmpbuf_len = inlen;
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tmpbuf = XCALLOC(1, tmpbuf_len);
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if (tmpbuf == NULL) {
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err = CRYPT_MEM;
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goto LBL_ERR;
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}
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err = der_decode_subject_public_key_info(in, inlen,
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PKA_RSA, tmpbuf, &tmpbuf_len,
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LTC_ASN1_NULL, NULL, 0);
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if (err == CRYPT_OK) { /* SubjectPublicKeyInfo format */
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/* now it should be SEQUENCE { INTEGER, INTEGER } */
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if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len,
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LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_INTEGER, 1UL, key->e,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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key->type = PK_PUBLIC;
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err = CRYPT_OK;
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goto LBL_FREE;
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}
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/* not SSL public key, try to match against PKCS #1 standards */
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err = der_decode_sequence_multi(in, inlen, LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_EOL, 0UL, NULL);
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if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) {
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goto LBL_ERR;
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}
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if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) {
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if ((err = mp_init(&zero)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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/* it's a private key */
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if ((err = der_decode_sequence_multi(in, inlen,
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LTC_ASN1_INTEGER, 1UL, zero,
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LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_INTEGER, 1UL, key->e,
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LTC_ASN1_INTEGER, 1UL, key->d,
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LTC_ASN1_INTEGER, 1UL, key->p,
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LTC_ASN1_INTEGER, 1UL, key->q,
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LTC_ASN1_INTEGER, 1UL, key->dP,
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LTC_ASN1_INTEGER, 1UL, key->dQ,
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LTC_ASN1_INTEGER, 1UL, key->qP,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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mp_clear(zero);
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goto LBL_ERR;
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}
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mp_clear(zero);
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key->type = PK_PRIVATE;
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} else if (mp_cmp_d(key->N, 1) == LTC_MP_EQ) {
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/* we don't support multi-prime RSA */
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err = CRYPT_PK_INVALID_TYPE;
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goto LBL_ERR;
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} else {
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/* it's a public key and we lack e */
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if ((err = der_decode_sequence_multi(in, inlen,
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LTC_ASN1_INTEGER, 1UL, key->N,
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LTC_ASN1_INTEGER, 1UL, key->e,
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LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
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goto LBL_ERR;
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}
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key->type = PK_PUBLIC;
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}
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err = CRYPT_OK;
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goto LBL_FREE;
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LBL_ERR:
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mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL);
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LBL_FREE:
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if (tmpbuf != NULL)
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XFREE(tmpbuf);
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return err;
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}
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#endif /* LTC_MRSA */
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/* ref: HEAD -> master, tag: v1.18.2 */
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/* git commit: 7e7eb695d581782f04b24dc444cbfde86af59853 */
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/* commit time: 2018-07-01 22:49:01 +0200 */
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