diff options
Diffstat (limited to 'libtomcrypt/src/pk/rsa/rsa_import_pkcs8.c')
| -rw-r--r-- | libtomcrypt/src/pk/rsa/rsa_import_pkcs8.c | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/libtomcrypt/src/pk/rsa/rsa_import_pkcs8.c b/libtomcrypt/src/pk/rsa/rsa_import_pkcs8.c new file mode 100644 index 0000000..8e15e06 --- /dev/null +++ b/libtomcrypt/src/pk/rsa/rsa_import_pkcs8.c @@ -0,0 +1,153 @@ +/* LibTomCrypt, modular cryptographic library -- Tom St Denis + * + * LibTomCrypt is a library that provides various cryptographic + * algorithms in a highly modular and flexible manner. + * + * The library is free for all purposes without any express + * guarantee it works. + */ +#include "tomcrypt.h" + +/** + @file rsa_import_pkcs8.c + Import a PKCS RSA key +*/ + +#ifdef LTC_MRSA + +/* Public-Key Cryptography Standards (PKCS) #8: + * Private-Key Information Syntax Specification Version 1.2 + * https://tools.ietf.org/html/rfc5208 + * + * PrivateKeyInfo ::= SEQUENCE { + * version Version, + * privateKeyAlgorithm PrivateKeyAlgorithmIdentifier, + * privateKey PrivateKey, + * attributes [0] IMPLICIT Attributes OPTIONAL } + * where: + * - Version ::= INTEGER + * - PrivateKeyAlgorithmIdentifier ::= AlgorithmIdentifier + * - PrivateKey ::= OCTET STRING + * - Attributes ::= SET OF Attribute + * + * EncryptedPrivateKeyInfo ::= SEQUENCE { + * encryptionAlgorithm EncryptionAlgorithmIdentifier, + * encryptedData EncryptedData } + * where: + * - EncryptionAlgorithmIdentifier ::= AlgorithmIdentifier + * - EncryptedData ::= OCTET STRING + */ + +/** + Import an RSAPublicKey or RSAPrivateKey in PKCS#8 format + @param in The packet to import from + @param inlen It's length (octets) + @param passwd The password for decrypting privkey (NOT SUPPORTED YET) + @param passwdlen Password's length (octets) + @param key [out] Destination for newly imported key + @return CRYPT_OK if successful, upon error allocated memory is freed +*/ +int rsa_import_pkcs8(const unsigned char *in, unsigned long inlen, + const void *passwd, unsigned long passwdlen, + rsa_key *key) +{ + int err; + void *zero, *iter; + unsigned char *buf1 = NULL, *buf2 = NULL; + unsigned long buf1len, buf2len; + unsigned long oid[16]; + oid_st rsaoid; + ltc_asn1_list alg_seq[2], top_seq[3]; + ltc_asn1_list alg_seq_e[2], key_seq_e[2], top_seq_e[2]; + unsigned char *decrypted = NULL; + unsigned long decryptedlen; + + LTC_ARGCHK(in != NULL); + LTC_ARGCHK(key != NULL); + LTC_ARGCHK(ltc_mp.name != NULL); + + /* get RSA alg oid */ + err = pk_get_oid(PKA_RSA, &rsaoid); + if (err != CRYPT_OK) { goto LBL_NOFREE; } + + /* alloc buffers */ + buf1len = inlen; /* approx. */ + buf1 = XMALLOC(buf1len); + if (buf1 == NULL) { err = CRYPT_MEM; goto LBL_NOFREE; } + buf2len = inlen; /* approx. */ + buf2 = XMALLOC(buf2len); + if (buf2 == NULL) { err = CRYPT_MEM; goto LBL_FREE1; } + + /* init key */ + err = mp_init_multi(&key->e, &key->d, &key->N, &key->dQ, &key->dP, &key->qP, &key->p, &key->q, &zero, &iter, NULL); + if (err != CRYPT_OK) { goto LBL_FREE2; } + + /* try to decode encrypted priv key */ + LTC_SET_ASN1(key_seq_e, 0, LTC_ASN1_OCTET_STRING, buf1, buf1len); + LTC_SET_ASN1(key_seq_e, 1, LTC_ASN1_INTEGER, iter, 1UL); + LTC_SET_ASN1(alg_seq_e, 0, LTC_ASN1_OBJECT_IDENTIFIER, oid, 16UL); + LTC_SET_ASN1(alg_seq_e, 1, LTC_ASN1_SEQUENCE, key_seq_e, 2UL); + LTC_SET_ASN1(top_seq_e, 0, LTC_ASN1_SEQUENCE, alg_seq_e, 2UL); + LTC_SET_ASN1(top_seq_e, 1, LTC_ASN1_OCTET_STRING, buf2, buf2len); + err=der_decode_sequence(in, inlen, top_seq_e, 2UL); + if (err == CRYPT_OK) { + LTC_UNUSED_PARAM(passwd); + LTC_UNUSED_PARAM(passwdlen); + /* XXX: TODO encrypted pkcs8 not implemented yet */ + /* fprintf(stderr, "decrypt: iter=%ld salt.len=%ld encdata.len=%ld\n", mp_get_int(iter), key_seq_e[0].size, top_seq_e[1].size); */ + err = CRYPT_PK_INVALID_TYPE; + goto LBL_ERR; + } + else { + decrypted = (unsigned char *)in; + decryptedlen = inlen; + } + + /* try to decode unencrypted priv key */ + LTC_SET_ASN1(alg_seq, 0, LTC_ASN1_OBJECT_IDENTIFIER, oid, 16UL); + LTC_SET_ASN1(alg_seq, 1, LTC_ASN1_NULL, NULL, 0UL); + LTC_SET_ASN1(top_seq, 0, LTC_ASN1_INTEGER, zero, 1UL); + LTC_SET_ASN1(top_seq, 1, LTC_ASN1_SEQUENCE, alg_seq, 2UL); + LTC_SET_ASN1(top_seq, 2, LTC_ASN1_OCTET_STRING, buf1, buf1len); + err=der_decode_sequence(decrypted, decryptedlen, top_seq, 3UL); + if (err != CRYPT_OK) { goto LBL_ERR; } + + /* check alg oid */ + if ((alg_seq[0].size != rsaoid.OIDlen) || + XMEMCMP(rsaoid.OID, alg_seq[0].data, rsaoid.OIDlen * sizeof(rsaoid.OID[0]))) { + err = CRYPT_PK_INVALID_TYPE; + goto LBL_ERR; + } + + err = der_decode_sequence_multi(buf1, top_seq[2].size, + LTC_ASN1_INTEGER, 1UL, zero, + LTC_ASN1_INTEGER, 1UL, key->N, + LTC_ASN1_INTEGER, 1UL, key->e, + LTC_ASN1_INTEGER, 1UL, key->d, + LTC_ASN1_INTEGER, 1UL, key->p, + LTC_ASN1_INTEGER, 1UL, key->q, + LTC_ASN1_INTEGER, 1UL, key->dP, + LTC_ASN1_INTEGER, 1UL, key->dQ, + LTC_ASN1_INTEGER, 1UL, key->qP, + LTC_ASN1_EOL, 0UL, NULL); + if (err != CRYPT_OK) { goto LBL_ERR; } + key->type = PK_PRIVATE; + err = CRYPT_OK; + goto LBL_FREE2; + +LBL_ERR: + rsa_free(key); +LBL_FREE2: + mp_clear_multi(iter, zero, NULL); + XFREE(buf2); +LBL_FREE1: + XFREE(buf1); +LBL_NOFREE: + return err; +} + +#endif /* LTC_MRSA */ + +/* ref: $Format:%D$ */ +/* git commit: $Format:%H$ */ +/* commit time: $Format:%ai$ */ |