1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 * LibTomCrypt is a library that provides various cryptographic
4 * algorithms in a highly modular and flexible manner.
6 * The library is free for all purposes without any express
13 Import a PKCS RSA key, Tom St Denis
19 Import an RSAPublicKey or RSAPrivateKey [two-prime only, only support >= 1024-bit keys, defined in PKCS #1 v2.1]
20 @param in The packet to import from
21 @param inlen It's length (octets)
22 @param key [out] Destination for newly imported key
23 @return CRYPT_OK if successful, upon error allocated memory is freed
25 int rsa_import(const unsigned char *in, unsigned long inlen, rsa_key *key)
29 unsigned char *tmpbuf=NULL;
30 unsigned long tmpbuf_len;
32 LTC_ARGCHK(in != NULL);
33 LTC_ARGCHK(key != NULL);
34 LTC_ARGCHK(ltc_mp.name != NULL);
37 if ((err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ,
38 &key->dP, &key->qP, &key->p, &key->q, NULL)) != CRYPT_OK) {
42 /* see if the OpenSSL DER format RSA public key will work */
44 tmpbuf = XCALLOC(1, tmpbuf_len);
50 err = der_decode_subject_public_key_info(in, inlen,
51 PKA_RSA, tmpbuf, &tmpbuf_len,
52 LTC_ASN1_NULL, NULL, 0);
54 if (err == CRYPT_OK) { /* SubjectPublicKeyInfo format */
56 /* now it should be SEQUENCE { INTEGER, INTEGER } */
57 if ((err = der_decode_sequence_multi(tmpbuf, tmpbuf_len,
58 LTC_ASN1_INTEGER, 1UL, key->N,
59 LTC_ASN1_INTEGER, 1UL, key->e,
60 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
63 key->type = PK_PUBLIC;
68 /* not SSL public key, try to match against PKCS #1 standards */
69 err = der_decode_sequence_multi(in, inlen, LTC_ASN1_INTEGER, 1UL, key->N,
70 LTC_ASN1_EOL, 0UL, NULL);
72 if (err != CRYPT_OK && err != CRYPT_INPUT_TOO_LONG) {
76 if (mp_cmp_d(key->N, 0) == LTC_MP_EQ) {
77 if ((err = mp_init(&zero)) != CRYPT_OK) {
80 /* it's a private key */
81 if ((err = der_decode_sequence_multi(in, inlen,
82 LTC_ASN1_INTEGER, 1UL, zero,
83 LTC_ASN1_INTEGER, 1UL, key->N,
84 LTC_ASN1_INTEGER, 1UL, key->e,
85 LTC_ASN1_INTEGER, 1UL, key->d,
86 LTC_ASN1_INTEGER, 1UL, key->p,
87 LTC_ASN1_INTEGER, 1UL, key->q,
88 LTC_ASN1_INTEGER, 1UL, key->dP,
89 LTC_ASN1_INTEGER, 1UL, key->dQ,
90 LTC_ASN1_INTEGER, 1UL, key->qP,
91 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
96 key->type = PK_PRIVATE;
97 } else if (mp_cmp_d(key->N, 1) == LTC_MP_EQ) {
98 /* we don't support multi-prime RSA */
99 err = CRYPT_PK_INVALID_TYPE;
102 /* it's a public key and we lack e */
103 if ((err = der_decode_sequence_multi(in, inlen,
104 LTC_ASN1_INTEGER, 1UL, key->N,
105 LTC_ASN1_INTEGER, 1UL, key->e,
106 LTC_ASN1_EOL, 0UL, NULL)) != CRYPT_OK) {
109 key->type = PK_PUBLIC;
115 mp_clear_multi(key->d, key->e, key->N, key->dQ, key->dP, key->qP, key->p, key->q, NULL);
124 #endif /* LTC_MRSA */
127 /* ref: $Format:%D$ */
128 /* git commit: $Format:%H$ */
129 /* commit time: $Format:%ai$ */