[thirdparty/strongswan.git] / src / libstrongswan / plugins / openssl / openssl_rsa_public_key.c

/*
 * Copyright (C) 2009 Martin Willi
 * Copyright (C) 2008 Tobias Brunner
 * Hochschule fuer Technik Rapperswil
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 */

#include "openssl_rsa_public_key.h"

#include <utils/debug.h>

#include <openssl/evp.h>
#include <openssl/rsa.h>
#include <openssl/x509.h>

typedef struct private_openssl_rsa_public_key_t private_openssl_rsa_public_key_t;

/**
 * Private data structure with signing context.
 */
struct private_openssl_rsa_public_key_t {
	/**
	 * Public interface for this signer.
	 */
	openssl_rsa_public_key_t public;

	/**
	 * RSA object from OpenSSL
	 */
	RSA *rsa;

	/**
	 * reference counter
	 */
	refcount_t ref;
};


/**
 * Verification of an EMPSA PKCS1 signature described in PKCS#1
 */
static bool verify_emsa_pkcs1_signature(private_openssl_rsa_public_key_t *this,
										int type, chunk_t data, chunk_t signature)
{
	bool valid = FALSE;
	int rsa_size = RSA_size(this->rsa);

	/* OpenSSL expects a signature of exactly RSA size (no leading 0x00) */
	if (signature.len > rsa_size)
	{
		signature = chunk_skip(signature, signature.len - rsa_size);
	}

	if (type == NID_undef)
	{
		chunk_t hash = chunk_alloc(rsa_size);

		hash.len = RSA_public_decrypt(signature.len, signature.ptr, hash.ptr,
									  this->rsa, RSA_PKCS1_PADDING);
		valid = chunk_equals(data, hash);
		free(hash.ptr);
	}
	else
	{
		EVP_MD_CTX *ctx;
		EVP_PKEY *key;
		const EVP_MD *hasher;

		hasher = EVP_get_digestbynid(type);
		if (!hasher)
		{
			return FALSE;
		}

		ctx = EVP_MD_CTX_create();
		key = EVP_PKEY_new();

		if (!ctx || !key)
		{
			goto error;
		}
		if (!EVP_PKEY_set1_RSA(key, this->rsa))
		{
			goto error;
		}
		if (!EVP_VerifyInit_ex(ctx, hasher, NULL))
		{
			goto error;
		}
		if (!EVP_VerifyUpdate(ctx, data.ptr, data.len))
		{
			goto error;
		}
		valid = (EVP_VerifyFinal(ctx, signature.ptr, signature.len, key) == 1);

error:
		if (key)
		{
			EVP_PKEY_free(key);
		}
		if (ctx)
		{
			EVP_MD_CTX_destroy(ctx);
		}
	}
	return valid;
}

METHOD(public_key_t, get_type, key_type_t,
	private_openssl_rsa_public_key_t *this)
{
	return KEY_RSA;
}

METHOD(public_key_t, verify, bool,
	private_openssl_rsa_public_key_t *this, signature_scheme_t scheme,
	chunk_t data, chunk_t signature)
{
	switch (scheme)
	{
		case SIGN_RSA_EMSA_PKCS1_NULL:
			return verify_emsa_pkcs1_signature(this, NID_undef, data, signature);
		case SIGN_RSA_EMSA_PKCS1_SHA1:
			return verify_emsa_pkcs1_signature(this, NID_sha1, data, signature);
		case SIGN_RSA_EMSA_PKCS1_SHA224:
			return verify_emsa_pkcs1_signature(this, NID_sha224, data, signature);
		case SIGN_RSA_EMSA_PKCS1_SHA256:
			return verify_emsa_pkcs1_signature(this, NID_sha256, data, signature);
		case SIGN_RSA_EMSA_PKCS1_SHA384:
			return verify_emsa_pkcs1_signature(this, NID_sha384, data, signature);
		case SIGN_RSA_EMSA_PKCS1_SHA512:
			return verify_emsa_pkcs1_signature(this, NID_sha512, data, signature);
		case SIGN_RSA_EMSA_PKCS1_MD5:
			return verify_emsa_pkcs1_signature(this, NID_md5, data, signature);
		default:
			DBG1(DBG_LIB, "signature scheme %N not supported in RSA",
				 signature_scheme_names, scheme);
			return FALSE;
	}
}

METHOD(public_key_t, encrypt, bool,
	private_openssl_rsa_public_key_t *this, encryption_scheme_t scheme,
	chunk_t plain, chunk_t *crypto)
{
	int padding, len;
	char *encrypted;

	switch (scheme)
	{
		case ENCRYPT_RSA_PKCS1:
			padding = RSA_PKCS1_PADDING;
			break;
		case ENCRYPT_RSA_OAEP_SHA1:
			padding = RSA_PKCS1_OAEP_PADDING;
			break;
		default:
			DBG1(DBG_LIB, "decryption scheme %N not supported via openssl",
				 encryption_scheme_names, scheme);
			return FALSE;
	}
	encrypted = malloc(RSA_size(this->rsa));
	len = RSA_public_encrypt(plain.len, plain.ptr, encrypted,
							 this->rsa, padding);
	if (len < 0)
	{
		DBG1(DBG_LIB, "RSA decryption failed");
		free(encrypted);
		return FALSE;
	}
	*crypto = chunk_create(encrypted, len);
	return TRUE;
}

METHOD(public_key_t, get_keysize, int,
	private_openssl_rsa_public_key_t *this)
{
	return RSA_size(this->rsa) * 8;
}

/**
 * Calculate fingerprint from a RSA key, also used in rsa private key.
 */
bool openssl_rsa_fingerprint(RSA *rsa, cred_encoding_type_t type, chunk_t *fp)
{
	hasher_t *hasher;
	chunk_t key;
	u_char *p;

	if (lib->encoding->get_cache(lib->encoding, type, rsa, fp))
	{
		return TRUE;
	}
	switch (type)
	{
		case KEYID_PUBKEY_SHA1:
			key = chunk_alloc(i2d_RSAPublicKey(rsa, NULL));
			p = key.ptr;
			i2d_RSAPublicKey(rsa, &p);
			break;
		case KEYID_PUBKEY_INFO_SHA1:
			key = chunk_alloc(i2d_RSA_PUBKEY(rsa, NULL));
			p = key.ptr;
			i2d_RSA_PUBKEY(rsa, &p);
			break;
		default:
			return FALSE;
	}
	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
	if (!hasher || !hasher->allocate_hash(hasher, key, fp))
	{
		DBG1(DBG_LIB, "SHA1 hash algorithm not supported, fingerprinting failed");
		DESTROY_IF(hasher);
		free(key.ptr);
		return FALSE;
	}
	free(key.ptr);
	hasher->destroy(hasher);
	lib->encoding->cache(lib->encoding, type, rsa, *fp);
	return TRUE;
}

METHOD(public_key_t, get_fingerprint, bool,
	private_openssl_rsa_public_key_t *this, cred_encoding_type_t type,
	chunk_t *fingerprint)
{
	return openssl_rsa_fingerprint(this->rsa, type, fingerprint);
}

METHOD(public_key_t, get_encoding, bool,
	private_openssl_rsa_public_key_t *this, cred_encoding_type_t type,
	chunk_t *encoding)
{
	u_char *p;

	switch (type)
	{
		case PUBKEY_SPKI_ASN1_DER:
		case PUBKEY_PEM:
		{
			bool success = TRUE;

			*encoding = chunk_alloc(i2d_RSA_PUBKEY(this->rsa, NULL));
			p = encoding->ptr;
			i2d_RSA_PUBKEY(this->rsa, &p);

			if (type == PUBKEY_PEM)
			{
				chunk_t asn1_encoding = *encoding;

				success = lib->encoding->encode(lib->encoding, PUBKEY_PEM,
								NULL, encoding, CRED_PART_RSA_PUB_ASN1_DER,
								asn1_encoding, CRED_PART_END);
				chunk_clear(&asn1_encoding);
			}
			return success;
		}
		case PUBKEY_ASN1_DER:
		{
			*encoding = chunk_alloc(i2d_RSAPublicKey(this->rsa, NULL));
			p = encoding->ptr;
			i2d_RSAPublicKey(this->rsa, &p);
			return TRUE;
		}
		default:
			return FALSE;
	}
}

METHOD(public_key_t, get_ref, public_key_t*,
	private_openssl_rsa_public_key_t *this)
{
	ref_get(&this->ref);
	return &this->public.key;
}

METHOD(public_key_t, destroy, void,
	private_openssl_rsa_public_key_t *this)
{
	if (ref_put(&this->ref))
	{
		if (this->rsa)
		{
			lib->encoding->clear_cache(lib->encoding, this->rsa);
			RSA_free(this->rsa);
		}
		free(this);
	}
}

/**
 * Generic private constructor
 */
static private_openssl_rsa_public_key_t *create_empty()
{
	private_openssl_rsa_public_key_t *this;

	INIT(this,
		.public = {
			.key = {
				.get_type = _get_type,
				.verify = _verify,
				.encrypt = _encrypt,
				.equals = public_key_equals,
				.get_keysize = _get_keysize,
				.get_fingerprint = _get_fingerprint,
				.has_fingerprint = public_key_has_fingerprint,
				.get_encoding = _get_encoding,
				.get_ref = _get_ref,
				.destroy = _destroy,
			},
		},
		.ref = 1,
	);

	return this;
}

/**
 * See header.
 */
openssl_rsa_public_key_t *openssl_rsa_public_key_load(key_type_t type,
													  va_list args)
{
	private_openssl_rsa_public_key_t *this;
	chunk_t blob, n, e;

	n = e = blob = chunk_empty;
	while (TRUE)
	{
		switch (va_arg(args, builder_part_t))
		{
			case BUILD_BLOB_ASN1_DER:
				blob = va_arg(args, chunk_t);
				continue;
			case BUILD_RSA_MODULUS:
				n = va_arg(args, chunk_t);
				continue;
			case BUILD_RSA_PUB_EXP:
				e = va_arg(args, chunk_t);
				continue;
			case BUILD_END:
				break;
			default:
				return NULL;
		}
		break;
	}

	this = create_empty();
	if (blob.ptr)
	{
		switch (type)
		{
			case KEY_ANY:
				this->rsa = d2i_RSA_PUBKEY(NULL, (const u_char**)&blob.ptr,
										   blob.len);
				break;
			case KEY_RSA:
				this->rsa = d2i_RSAPublicKey(NULL, (const u_char**)&blob.ptr,
											 blob.len);
				break;
			default:
				break;
		}
		if (this->rsa)
		{
			return &this->public;
		}
	}
	else if (n.ptr && e.ptr && type == KEY_RSA)
	{
		this->rsa = RSA_new();
		this->rsa->n = BN_bin2bn((const u_char*)n.ptr, n.len, NULL);
		this->rsa->e = BN_bin2bn((const u_char*)e.ptr, e.len, NULL);
		return &this->public;
	}
	destroy(this);
	return NULL;
}
Commit	Line	Data
84770ded	1	/*
e35c3e2a	2	* Copyright (C) 2009 Martin Willi
84770ded TB	3	* Copyright (C) 2008 Tobias Brunner
	4	* Hochschule fuer Technik Rapperswil
	5	*
	6	* This program is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2 of the License, or (at your
	9	* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
	10	*
	11	* This program is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
	13	* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	14	* for more details.
84770ded TB	15	*/
	16
	17	#include "openssl_rsa_public_key.h"
	18
f05b4272	19	#include <utils/debug.h>
84770ded TB	20
	21	#include <openssl/evp.h>
	22	#include <openssl/rsa.h>
b12c6d16	23	#include <openssl/x509.h>
84770ded TB	24
	25	typedef struct private_openssl_rsa_public_key_t private_openssl_rsa_public_key_t;
	26
	27	/**
	28	* Private data structure with signing context.
	29	*/
	30	struct private_openssl_rsa_public_key_t {
	31	/**
	32	* Public interface for this signer.
	33	*/
	34	openssl_rsa_public_key_t public;
7daf5226	35
84770ded TB	36	/**
	37	* RSA object from OpenSSL
	38	*/
	39	RSA *rsa;
7daf5226	40
84770ded TB	41	/**
	42	* reference counter
	43	*/
	44	refcount_t ref;
	45	};
	46
3cd6077b SC	47
3cd6077b SC	48
84770ded TB	49	/**
	50	* Verification of an EMPSA PKCS1 signature described in PKCS#1
	51	*/
	52	static bool verify_emsa_pkcs1_signature(private_openssl_rsa_public_key_t *this,
	53	int type, chunk_t data, chunk_t signature)
	54	{
	55	bool valid = FALSE;
29bbfc11 AS	56	int rsa_size = RSA_size(this->rsa);
	57
	58	/* OpenSSL expects a signature of exactly RSA size (no leading 0x00) */
	59	if (signature.len > rsa_size)
84770ded	60	{
29bbfc11	61	signature = chunk_skip(signature, signature.len - rsa_size);
84770ded	62	}
29bbfc11 AS	63
29bbfc11 AS	64	if (type == NID_undef)
84770ded	65	{
29bbfc11 AS	66	chunk_t hash = chunk_alloc(rsa_size);
	67
	68	hash.len = RSA_public_decrypt(signature.len, signature.ptr, hash.ptr,
	69	this->rsa, RSA_PKCS1_PADDING);
	70	valid = chunk_equals(data, hash);
	71	free(hash.ptr);
84770ded	72	}
29bbfc11	73	else
d6dc9db5	74	{
29bbfc11 AS	75	EVP_MD_CTX *ctx;
	76	EVP_PKEY *key;
	77	const EVP_MD *hasher;
	78
	79	hasher = EVP_get_digestbynid(type);
	80	if (!hasher)
	81	{
	82	return FALSE;
	83	}
	84
	85	ctx = EVP_MD_CTX_create();
	86	key = EVP_PKEY_new();
	87
	88	if (!ctx \|\| !key)
	89	{
	90	goto error;
	91	}
	92	if (!EVP_PKEY_set1_RSA(key, this->rsa))
	93	{
	94	goto error;
	95	}
	96	if (!EVP_VerifyInit_ex(ctx, hasher, NULL))
	97	{
	98	goto error;
	99	}
	100	if (!EVP_VerifyUpdate(ctx, data.ptr, data.len))
	101	{
	102	goto error;
	103	}
	104	valid = (EVP_VerifyFinal(ctx, signature.ptr, signature.len, key) == 1);
7daf5226	105
84770ded	106	error:
29bbfc11 AS	107	if (key)
	108	{
	109	EVP_PKEY_free(key);
	110	}
	111	if (ctx)
	112	{
	113	EVP_MD_CTX_destroy(ctx);
	114	}
84770ded TB	115	}
	116	return valid;
	117	}
	118
57202484 MW	119	METHOD(public_key_t, get_type, key_type_t,
57202484 MW	120	private_openssl_rsa_public_key_t *this)
84770ded TB	121	{
	122	return KEY_RSA;
	123	}
	124
57202484 MW	125	METHOD(public_key_t, verify, bool,
	126	private_openssl_rsa_public_key_t *this, signature_scheme_t scheme,
	127	chunk_t data, chunk_t signature)
84770ded TB	128	{
	129	switch (scheme)
	130	{
29bbfc11 AS	131	case SIGN_RSA_EMSA_PKCS1_NULL:
29bbfc11 AS	132	return verify_emsa_pkcs1_signature(this, NID_undef, data, signature);
84770ded TB	133	case SIGN_RSA_EMSA_PKCS1_SHA1:
84770ded TB	134	return verify_emsa_pkcs1_signature(this, NID_sha1, data, signature);
b6f739c1 AS	135	case SIGN_RSA_EMSA_PKCS1_SHA224:
b6f739c1 AS	136	return verify_emsa_pkcs1_signature(this, NID_sha224, data, signature);
84770ded TB	137	case SIGN_RSA_EMSA_PKCS1_SHA256:
	138	return verify_emsa_pkcs1_signature(this, NID_sha256, data, signature);
	139	case SIGN_RSA_EMSA_PKCS1_SHA384:
	140	return verify_emsa_pkcs1_signature(this, NID_sha384, data, signature);
	141	case SIGN_RSA_EMSA_PKCS1_SHA512:
	142	return verify_emsa_pkcs1_signature(this, NID_sha512, data, signature);
	143	case SIGN_RSA_EMSA_PKCS1_MD5:
	144	return verify_emsa_pkcs1_signature(this, NID_md5, data, signature);
	145	default:
8b0e0910	146	DBG1(DBG_LIB, "signature scheme %N not supported in RSA",
84770ded TB	147	signature_scheme_names, scheme);
	148	return FALSE;
	149	}
	150	}
	151
57202484	152	METHOD(public_key_t, encrypt, bool,
33ddaaab	153	private_openssl_rsa_public_key_t *this, encryption_scheme_t scheme,
d775af9d	154	chunk_t plain, chunk_t *crypto)
84770ded	155	{
d775af9d MW	156	int padding, len;
	157	char *encrypted;
	158
	159	switch (scheme)
	160	{
	161	case ENCRYPT_RSA_PKCS1:
	162	padding = RSA_PKCS1_PADDING;
	163	break;
	164	case ENCRYPT_RSA_OAEP_SHA1:
	165	padding = RSA_PKCS1_OAEP_PADDING;
	166	break;
	167	default:
	168	DBG1(DBG_LIB, "decryption scheme %N not supported via openssl",
	169	encryption_scheme_names, scheme);
	170	return FALSE;
	171	}
	172	encrypted = malloc(RSA_size(this->rsa));
	173	len = RSA_public_encrypt(plain.len, plain.ptr, encrypted,
	174	this->rsa, padding);
	175	if (len < 0)
	176	{
	177	DBG1(DBG_LIB, "RSA decryption failed");
	178	free(encrypted);
	179	return FALSE;
	180	}
	181	*crypto = chunk_create(encrypted, len);
	182	return TRUE;
84770ded TB	183	}
84770ded TB	184
a944d209	185	METHOD(public_key_t, get_keysize, int,
57202484	186	private_openssl_rsa_public_key_t *this)
84770ded	187	{
a944d209	188	return RSA_size(this->rsa) * 8;
84770ded TB	189	}
	190
	191	/**
b12c6d16	192	* Calculate fingerprint from a RSA key, also used in rsa private key.
84770ded	193	*/
da9724e6	194	bool openssl_rsa_fingerprint(RSA rsa, cred_encoding_type_t type, chunk_t fp)
84770ded	195	{
b12c6d16 MW	196	hasher_t *hasher;
b12c6d16 MW	197	chunk_t key;
e35c3e2a	198	u_char *p;
7daf5226	199
b12c6d16	200	if (lib->encoding->get_cache(lib->encoding, type, rsa, fp))
84770ded	201	{
e35c3e2a	202	return TRUE;
84770ded	203	}
b12c6d16 MW	204	switch (type)
b12c6d16 MW	205	{
da9724e6	206	case KEYID_PUBKEY_SHA1:
b12c6d16 MW	207	key = chunk_alloc(i2d_RSAPublicKey(rsa, NULL));
	208	p = key.ptr;
	209	i2d_RSAPublicKey(rsa, &p);
	210	break;
da9724e6	211	case KEYID_PUBKEY_INFO_SHA1:
b12c6d16 MW	212	key = chunk_alloc(i2d_RSA_PUBKEY(rsa, NULL));
	213	p = key.ptr;
	214	i2d_RSA_PUBKEY(rsa, &p);
	215	break;
	216	default:
	217	return FALSE;
	218	}
	219	hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1);
87dd205b	220	if (!hasher \|\| !hasher->allocate_hash(hasher, key, fp))
b12c6d16	221	{
8b0e0910	222	DBG1(DBG_LIB, "SHA1 hash algorithm not supported, fingerprinting failed");
87dd205b	223	DESTROY_IF(hasher);
b12c6d16 MW	224	free(key.ptr);
	225	return FALSE;
	226	}
1a8ef8aa	227	free(key.ptr);
b12c6d16 MW	228	hasher->destroy(hasher);
	229	lib->encoding->cache(lib->encoding, type, rsa, *fp);
	230	return TRUE;
	231	}
	232
57202484 MW	233	METHOD(public_key_t, get_fingerprint, bool,
	234	private_openssl_rsa_public_key_t *this, cred_encoding_type_t type,
	235	chunk_t *fingerprint)
b12c6d16 MW	236	{
b12c6d16 MW	237	return openssl_rsa_fingerprint(this->rsa, type, fingerprint);
84770ded TB	238	}
84770ded TB	239
57202484 MW	240	METHOD(public_key_t, get_encoding, bool,
	241	private_openssl_rsa_public_key_t *this, cred_encoding_type_t type,
	242	chunk_t *encoding)
84770ded	243	{
e35c3e2a	244	u_char *p;
7daf5226	245
b12c6d16 MW	246	switch (type)
b12c6d16 MW	247	{
da9724e6 MW	248	case PUBKEY_SPKI_ASN1_DER:
da9724e6 MW	249	case PUBKEY_PEM:
b12c6d16	250	{
29cf15a9 AS	251	bool success = TRUE;
29cf15a9 AS	252
b12c6d16 MW	253	*encoding = chunk_alloc(i2d_RSA_PUBKEY(this->rsa, NULL));
	254	p = encoding->ptr;
	255	i2d_RSA_PUBKEY(this->rsa, &p);
29cf15a9	256
da9724e6	257	if (type == PUBKEY_PEM)
29cf15a9 AS	258	{
	259	chunk_t asn1_encoding = *encoding;
	260
da9724e6 MW	261	success = lib->encoding->encode(lib->encoding, PUBKEY_PEM,
	262	NULL, encoding, CRED_PART_RSA_PUB_ASN1_DER,
	263	asn1_encoding, CRED_PART_END);
29cf15a9	264	chunk_clear(&asn1_encoding);
0a4dc787	265	}
29cf15a9	266	return success;
b12c6d16	267	}
da9724e6	268	case PUBKEY_ASN1_DER:
b12c6d16 MW	269	{
	270	*encoding = chunk_alloc(i2d_RSAPublicKey(this->rsa, NULL));
	271	p = encoding->ptr;
	272	i2d_RSAPublicKey(this->rsa, &p);
	273	return TRUE;
	274	}
	275	default:
	276	return FALSE;
	277	}
84770ded TB	278	}
84770ded TB	279
57202484 MW	280	METHOD(public_key_t, get_ref, public_key_t*,
57202484 MW	281	private_openssl_rsa_public_key_t *this)
84770ded TB	282	{
84770ded TB	283	ref_get(&this->ref);
57202484	284	return &this->public.key;
84770ded TB	285	}
84770ded TB	286
57202484 MW	287	METHOD(public_key_t, destroy, void,
57202484 MW	288	private_openssl_rsa_public_key_t *this)
84770ded TB	289	{
	290	if (ref_put(&this->ref))
	291	{
	292	if (this->rsa)
	293	{
b12c6d16	294	lib->encoding->clear_cache(lib->encoding, this->rsa);
84770ded TB	295	RSA_free(this->rsa);
84770ded TB	296	}
84770ded TB	297	free(this);
	298	}
	299	}
	300
	301	/**
	302	* Generic private constructor
	303	*/
e35c3e2a	304	static private_openssl_rsa_public_key_t *create_empty()
84770ded	305	{
57202484 MW	306	private_openssl_rsa_public_key_t *this;
	307
	308	INIT(this,
ba31fe1f MW	309	.public = {
	310	.key = {
	311	.get_type = _get_type,
	312	.verify = _verify,
	313	.encrypt = _encrypt,
	314	.equals = public_key_equals,
	315	.get_keysize = _get_keysize,
	316	.get_fingerprint = _get_fingerprint,
	317	.has_fingerprint = public_key_has_fingerprint,
	318	.get_encoding = _get_encoding,
	319	.get_ref = _get_ref,
	320	.destroy = _destroy,
	321	},
57202484 MW	322	},
	323	.ref = 1,
	324	);
7daf5226	325
84770ded TB	326	return this;
	327	}
	328
84770ded	329	/**
30c06407	330	* See header.
84770ded	331	*/
30c06407 MW	332	openssl_rsa_public_key_t *openssl_rsa_public_key_load(key_type_t type,
30c06407 MW	333	va_list args)
84770ded	334	{
30c06407	335	private_openssl_rsa_public_key_t *this;
b9fbd665	336	chunk_t blob, n, e;
7daf5226	337
b9fbd665	338	n = e = blob = chunk_empty;
30c06407	339	while (TRUE)
84770ded	340	{
30c06407	341	switch (va_arg(args, builder_part_t))
84770ded	342	{
f7c17aa1	343	case BUILD_BLOB_ASN1_DER:
30c06407 MW	344	blob = va_arg(args, chunk_t);
30c06407 MW	345	continue;
b9fbd665 MW	346	case BUILD_RSA_MODULUS:
	347	n = va_arg(args, chunk_t);
	348	continue;
	349	case BUILD_RSA_PUB_EXP:
	350	e = va_arg(args, chunk_t);
	351	continue;
30c06407	352	case BUILD_END:
f7c17aa1	353	break;
30c06407 MW	354	default:
30c06407 MW	355	return NULL;
84770ded	356	}
30c06407	357	break;
84770ded	358	}
84770ded	359
30c06407	360	this = create_empty();
b9fbd665 MW	361	if (blob.ptr)
b9fbd665 MW	362	{
026b0058 MW	363	switch (type)
	364	{
	365	case KEY_ANY:
	366	this->rsa = d2i_RSA_PUBKEY(NULL, (const u_char**)&blob.ptr,
	367	blob.len);
	368	break;
	369	case KEY_RSA:
	370	this->rsa = d2i_RSAPublicKey(NULL, (const u_char**)&blob.ptr,
	371	blob.len);
	372	break;
	373	default:
	374	break;
	375	}
b9fbd665 MW	376	if (this->rsa)
	377	{
	378	return &this->public;
	379	}
	380	}
026b0058	381	else if (n.ptr && e.ptr && type == KEY_RSA)
84770ded	382	{
b9fbd665 MW	383	this->rsa = RSA_new();
	384	this->rsa->n = BN_bin2bn((const u_char*)n.ptr, n.len, NULL);
	385	this->rsa->e = BN_bin2bn((const u_char*)e.ptr, e.len, NULL);
	386	return &this->public;
84770ded	387	}
b9fbd665 MW	388	destroy(this);
b9fbd665 MW	389	return NULL;
84770ded	390	}