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authorMartin Willi <martin@strongswan.org>2006-04-05 12:10:50 +0000
committerMartin Willi <martin@strongswan.org>2006-04-05 12:10:50 +0000
commit6862128151fb78f63685a8da5575783c426d64a7 (patch)
tree75920a6688ed5654fb917ecccc1e0e469480fd1f /Source/charon/transforms/rsa/rsa_private_key.c
parent3dbbbf3e16366b0da33b29bbc1a4ba9a976e43a0 (diff)
downloadstrongswan-6862128151fb78f63685a8da5575783c426d64a7.tar.bz2
strongswan-6862128151fb78f63685a8da5575783c426d64a7.tar.xz
../svn-commit.tmp
Diffstat (limited to 'Source/charon/transforms/rsa/rsa_private_key.c')
-rw-r--r--Source/charon/transforms/rsa/rsa_private_key.c597
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diff --git a/Source/charon/transforms/rsa/rsa_private_key.c b/Source/charon/transforms/rsa/rsa_private_key.c
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--- a/Source/charon/transforms/rsa/rsa_private_key.c
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@@ -1,597 +0,0 @@
-/**
- * @file rsa_private_key.c
- *
- * @brief Implementation of rsa_private_key_t.
- *
- */
-
-/*
- * Copyright (C) 2005 Jan Hutter, Martin Willi
- * 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 <gmp.h>
-#include <sys/stat.h>
-#include <unistd.h>
-
-#include "rsa_private_key.h"
-
-#include <daemon.h>
-#include <utils/allocator.h>
-#include <asn1/der_decoder.h>
-
-
-/*
- * Oids for hash algorithms are defined in
- * rsa_public_key.c.
- */
-extern u_int8_t md2_oid[18];
-extern u_int8_t md5_oid[18];
-extern u_int8_t sha1_oid[15];
-extern u_int8_t sha256_oid[19];
-extern u_int8_t sha384_oid[19];
-extern u_int8_t sha512_oid[19];
-
-
-/**
- * Public exponent to use for key generation.
- */
-#define PUBLIC_EXPONENT 0x10001
-
-
-typedef struct private_rsa_private_key_t private_rsa_private_key_t;
-
-/**
- * Private data of a rsa_private_key_t object.
- */
-struct private_rsa_private_key_t {
- /**
- * Public interface for this signer.
- */
- rsa_private_key_t public;
-
- /**
- * Version of key, as encoded in PKCS#1
- */
- u_int version;
-
- /**
- * Public modulus.
- */
- mpz_t n;
-
- /**
- * Public exponent.
- */
- mpz_t e;
-
- /**
- * Private prime 1.
- */
- mpz_t p;
-
- /**
- * Private Prime 2.
- */
- mpz_t q;
-
- /**
- * Private exponent.
- */
- mpz_t d;
-
- /**
- * Private exponent 1.
- */
- mpz_t exp1;
-
- /**
- * Private exponent 2.
- */
- mpz_t exp2;
-
- /**
- * Private coefficient.
- */
- mpz_t coeff;
-
- /**
- * Keysize in bytes.
- */
- size_t k;
-
- /**
- * @brief Implements the RSADP algorithm specified in PKCS#1.
- *
- * @param this calling object
- * @param data data to process
- * @return processed data
- */
- chunk_t (*rsadp) (private_rsa_private_key_t *this, chunk_t data);
-
- /**
- * @brief Implements the RSASP1 algorithm specified in PKCS#1.
- * @param this calling object
- * @param data data to process
- * @return processed data
- */
- chunk_t (*rsasp1) (private_rsa_private_key_t *this, chunk_t data);
-
- /**
- * @brief Generate a prime value.
- *
- * @param this calling object
- * @param prime_size size of the prime, in bytes
- * @param[out] prime uninitialized mpz
- */
- void (*compute_prime) (private_rsa_private_key_t *this, size_t prime_size, mpz_t *prime);
-
-};
-
-/**
- * Rules for de-/encoding of a private key from/in ASN1
- */
-static asn1_rule_t rsa_private_key_rules[] = {
- {ASN1_SEQUENCE, 0, 0, 0},
- { ASN1_INTEGER, 0, offsetof(private_rsa_private_key_t, version), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, n), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, e), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, d), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, p), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, q), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, exp1), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, exp2), 0},
- { ASN1_INTEGER, ASN1_MPZ, offsetof(private_rsa_private_key_t, coeff), 0},
- {ASN1_END, 0, 0, 0},
-};
-
-static private_rsa_private_key_t *rsa_private_key_create_empty();
-
-/**
- * Implementation of private_rsa_private_key_t.compute_prime.
- */
-static void compute_prime(private_rsa_private_key_t *this, size_t prime_size, mpz_t *prime)
-{
- randomizer_t *randomizer;
- chunk_t random_bytes;
-
- randomizer = randomizer_create();
- mpz_init(*prime);
-
- do
- {
- randomizer->allocate_random_bytes(randomizer, prime_size, &random_bytes);
-
- /* make sure most significant bit is set */
- random_bytes.ptr[0] = random_bytes.ptr[0] | 0x80;
-
- /* convert chunk to mpz value */
- mpz_import(*prime, random_bytes.len, 1, 1, 1, 0, random_bytes.ptr);
-
- /* get next prime */
- mpz_nextprime (*prime, *prime);
-
- allocator_free(random_bytes.ptr);
- }
- /* check if it isnt too large */
- while (((mpz_sizeinbase(*prime, 2) + 7) / 8) > prime_size);
-
- randomizer->destroy(randomizer);
-}
-
-/**
- * Implementation of private_rsa_private_key_t.rsadp and private_rsa_private_key_t.rsasp1.
- */
-static chunk_t rsadp(private_rsa_private_key_t *this, chunk_t data)
-{
- mpz_t t1, t2;
- chunk_t decrypted;
-
- mpz_init(t1);
- mpz_init(t2);
-
- mpz_import(t1, data.len, 1, 1, 1, 0, data.ptr);
-
- mpz_powm(t2, t1, this->exp1, this->p); /* m1 = c^dP mod p */
- mpz_powm(t1, t1, this->exp2, this->q); /* m2 = c^dQ mod Q */
- mpz_sub(t2, t2, t1); /* h = qInv (m1 - m2) mod p */
- mpz_mod(t2, t2, this->p);
- mpz_mul(t2, t2, this->coeff);
- mpz_mod(t2, t2, this->p);
-
- mpz_mul(t2, t2, this->q); /* m = m2 + h q */
- mpz_add(t1, t1, t2);
-
- decrypted.len = this->k;
- decrypted.ptr = mpz_export(NULL, NULL, 1, decrypted.len, 1, 0, t1);
-
- mpz_clear(t1);
- mpz_clear(t2);
-
- return decrypted;
-}
-
-/**
- * Implementation of rsa_private_key.build_emsa_signature.
- */
-static status_t build_emsa_pkcs1_signature(private_rsa_private_key_t *this, hash_algorithm_t hash_algorithm, chunk_t data, chunk_t *signature)
-{
- hasher_t *hasher;
- chunk_t hash;
- chunk_t oid;
- chunk_t em;
-
- /* get oid string prepended to hash */
- switch (hash_algorithm)
- {
- case HASH_MD2:
- {
- oid.ptr = md2_oid;
- oid.len = sizeof(md2_oid);
- break;
- }
- case HASH_MD5:
- {
- oid.ptr = md5_oid;
- oid.len = sizeof(md5_oid);
- break;
- }
- case HASH_SHA1:
- {
- oid.ptr = sha1_oid;
- oid.len = sizeof(sha1_oid);
- break;
- }
- case HASH_SHA256:
- {
- oid.ptr = sha256_oid;
- oid.len = sizeof(sha256_oid);
- break;
- }
- case HASH_SHA384:
- {
- oid.ptr = sha384_oid;
- oid.len = sizeof(sha384_oid);
- break;
- }
- case HASH_SHA512:
- {
- oid.ptr = sha512_oid;
- oid.len = sizeof(sha512_oid);
- break;
- }
- default:
- {
- return NOT_SUPPORTED;
- }
- }
-
- /* get hasher */
- hasher = hasher_create(hash_algorithm);
- if (hasher == NULL)
- {
- return NOT_SUPPORTED;
- }
-
- /* build hash */
- hasher->allocate_hash(hasher, data, &hash);
- hasher->destroy(hasher);
-
- /* build chunk to rsa-decrypt:
- * EM = 0x00 || 0x01 || PS || 0x00 || T.
- * PS = 0xFF padding, with length to fill em
- * T = oid || hash
- */
- em.len = this->k;
- em.ptr = allocator_alloc(em.len);
-
- /* fill em with padding */
- memset(em.ptr, 0xFF, em.len);
- /* set magic bytes */
- *(em.ptr) = 0x00;
- *(em.ptr+1) = 0x01;
- *(em.ptr + em.len - hash.len - oid.len - 1) = 0x00;
- /* set hash */
- memcpy(em.ptr + em.len - hash.len, hash.ptr, hash.len);
- /* set oid */
- memcpy(em.ptr + em.len - hash.len - oid.len, oid.ptr, oid.len);
-
-
- /* build signature */
- *signature = this->rsasp1(this, em);
-
- allocator_free(hash.ptr);
- allocator_free(em.ptr);
-
- return SUCCESS;
-}
-
-/**
- * Implementation of rsa_private_key.get_key.
- */
-static status_t get_key(private_rsa_private_key_t *this, chunk_t *key)
-{
- chunk_t n, e, p, q, d, exp1, exp2, coeff;
-
- n.len = this->k;
- n.ptr = mpz_export(NULL, NULL, 1, n.len, 1, 0, this->n);
- e.len = this->k;
- e.ptr = mpz_export(NULL, NULL, 1, e.len, 1, 0, this->e);
- p.len = this->k;
- p.ptr = mpz_export(NULL, NULL, 1, p.len, 1, 0, this->p);
- q.len = this->k;
- q.ptr = mpz_export(NULL, NULL, 1, q.len, 1, 0, this->q);
- d.len = this->k;
- d.ptr = mpz_export(NULL, NULL, 1, d.len, 1, 0, this->d);
- exp1.len = this->k;
- exp1.ptr = mpz_export(NULL, NULL, 1, exp1.len, 1, 0, this->exp1);
- exp2.len = this->k;
- exp2.ptr = mpz_export(NULL, NULL, 1, exp2.len, 1, 0, this->exp2);
- coeff.len = this->k;
- coeff.ptr = mpz_export(NULL, NULL, 1, coeff.len, 1, 0, this->coeff);
-
- key->len = this->k * 8;
- key->ptr = allocator_alloc(key->len);
- memcpy(key->ptr + this->k * 0, n.ptr , n.len);
- memcpy(key->ptr + this->k * 1, e.ptr, e.len);
- memcpy(key->ptr + this->k * 2, p.ptr, p.len);
- memcpy(key->ptr + this->k * 3, q.ptr, q.len);
- memcpy(key->ptr + this->k * 4, d.ptr, d.len);
- memcpy(key->ptr + this->k * 5, exp1.ptr, exp1.len);
- memcpy(key->ptr + this->k * 6, exp2.ptr, exp2.len);
- memcpy(key->ptr + this->k * 7, coeff.ptr, coeff.len);
-
- allocator_free(n.ptr);
- allocator_free(e.ptr);
- allocator_free(p.ptr);
- allocator_free(q.ptr);
- allocator_free(d.ptr);
- allocator_free(exp1.ptr);
- allocator_free(exp2.ptr);
- allocator_free(coeff.ptr);
-
- return SUCCESS;
-}
-
-/**
- * Implementation of rsa_private_key.save_key.
- */
-static status_t save_key(private_rsa_private_key_t *this, char *file)
-{
- return NOT_SUPPORTED;
-}
-
-/**
- * Implementation of rsa_private_key.get_public_key.
- */
-rsa_public_key_t *get_public_key(private_rsa_private_key_t *this)
-{
- return NULL;
-}
-
-/**
- * Implementation of rsa_private_key.belongs_to.
- */
-bool belongs_to(private_rsa_private_key_t *this, rsa_public_key_t *public)
-{
- if (mpz_cmp(this->n, *public->get_modulus(public)) == 0)
- {
- return TRUE;
- }
- return FALSE;
-}
-
-/**
- * Implementation of rsa_private_key.clone.
- */
-static rsa_private_key_t* _clone(private_rsa_private_key_t *this)
-{
- private_rsa_private_key_t *clone = rsa_private_key_create_empty();
-
- mpz_init_set(clone->n, this->n);
- mpz_init_set(clone->e, this->e);
- mpz_init_set(clone->p, this->p);
- mpz_init_set(clone->q, this->q);
- mpz_init_set(clone->d, this->d);
- mpz_init_set(clone->exp1, this->exp1);
- mpz_init_set(clone->exp2, this->exp2);
- mpz_init_set(clone->coeff, this->coeff);
- clone->k = this->k;
-
- return &clone->public;
-}
-
-/**
- * Implementation of rsa_private_key.destroy.
- */
-static void destroy(private_rsa_private_key_t *this)
-{
- mpz_clear(this->n);
- mpz_clear(this->e);
- mpz_clear(this->p);
- mpz_clear(this->q);
- mpz_clear(this->d);
- mpz_clear(this->exp1);
- mpz_clear(this->exp2);
- mpz_clear(this->coeff);
- allocator_free(this);
-}
-
-/**
- * Internal generic constructor
- */
-static private_rsa_private_key_t *rsa_private_key_create_empty()
-{
- private_rsa_private_key_t *this = allocator_alloc_thing(private_rsa_private_key_t);
-
- /* public functions */
- this->public.build_emsa_pkcs1_signature = (status_t (*) (rsa_private_key_t*,hash_algorithm_t,chunk_t,chunk_t*))build_emsa_pkcs1_signature;
- this->public.get_key = (status_t (*) (rsa_private_key_t*,chunk_t*))get_key;
- this->public.save_key = (status_t (*) (rsa_private_key_t*,char*))save_key;
- this->public.get_public_key = (rsa_public_key_t *(*) (rsa_private_key_t*))get_public_key;
- this->public.belongs_to = (bool (*) (rsa_private_key_t*,rsa_public_key_t*))belongs_to;
- this->public.clone = (rsa_private_key_t*(*)(rsa_private_key_t*))_clone;
- this->public.destroy = (void (*) (rsa_private_key_t*))destroy;
-
- /* private functions */
- this->rsadp = rsadp;
- this->rsasp1 = rsadp; /* same algorithm */
- this->compute_prime = compute_prime;
-
- return this;
-}
-
-/*
- * See header
- */
-rsa_private_key_t *rsa_private_key_create(size_t key_size)
-{
- mpz_t p, q, n, e, d, exp1, exp2, coeff;
- mpz_t m, q1, t;
- private_rsa_private_key_t *this;
-
- this = rsa_private_key_create_empty();
-
- key_size = key_size / 8;
-
- mpz_init(t);
- mpz_init(n);
- mpz_init(d);
- mpz_init(exp1);
- mpz_init(exp2);
- mpz_init(coeff);
-
- /* Get values of primes p and q */
- this->compute_prime(this, key_size/2, &p);
- this->compute_prime(this, key_size/2, &q);
-
- /* Swapping Primes so p is larger then q */
- if (mpz_cmp(p, q) < 0)
- {
- mpz_set(t, p);
- mpz_set(p, q);
- mpz_set(q, t);
- }
-
- mpz_mul(n, p, q); /* n = p*q */
- mpz_init_set_ui(e, PUBLIC_EXPONENT); /* assign public exponent */
- mpz_init_set(m, p); /* m = p */
- mpz_sub_ui(m, m, 1); /* m = m -1 */
- mpz_init_set(q1, q); /* q1 = q */
- mpz_sub_ui(q1, q1, 1); /* q1 = q1 -1 */
- mpz_gcd(t, m, q1); /* t = gcd(p-1, q-1) */
- mpz_mul(m, m, q1); /* m = (p-1)*(q-1) */
- mpz_divexact(m, m, t); /* m = m / t */
- mpz_gcd(t, m, e); /* t = gcd(m, e) (greatest common divisor) */
-
- mpz_invert(d, e, m); /* e has an inverse mod m */
- if (mpz_cmp_ui(d, 0) < 0) /* make sure d is positive */
- {
- mpz_add(d, d, m);
- }
- mpz_sub_ui(t, p, 1); /* t = p-1 */
- mpz_mod(exp1, d, t); /* exp1 = d mod p-1 */
- mpz_sub_ui(t, q, 1); /* t = q-1 */
- mpz_mod(exp2, d, t); /* exp2 = d mod q-1 */
-
- mpz_invert(coeff, q, p); /* coeff = q^-1 mod p */
- if (mpz_cmp_ui(coeff, 0) < 0) /* make coeff d is positive */
- {
- mpz_add(coeff, coeff, p);
- }
-
- mpz_clear(q1);
- mpz_clear(m);
- mpz_clear(t);
-
- /* apply values */
- *(this->p) = *p;
- *(this->q) = *q;
- *(this->n) = *n;
- *(this->e) = *e;
- *(this->d) = *d;
- *(this->exp1) = *exp1;
- *(this->exp2) = *exp2;
- *(this->coeff) = *coeff;
-
- /* set key size in bytes */
- this->k = key_size;
-
- return &this->public;
-}
-
-/*
- * see header
- */
-rsa_private_key_t *rsa_private_key_create_from_chunk(chunk_t chunk)
-{
- private_rsa_private_key_t *this;
- der_decoder_t *dd;
- status_t status;
-
- this = rsa_private_key_create_empty();
-
- mpz_init(this->n);
- mpz_init(this->e);
- mpz_init(this->p);
- mpz_init(this->q);
- mpz_init(this->d);
- mpz_init(this->exp1);
- mpz_init(this->exp2);
- mpz_init(this->coeff);
-
- dd = der_decoder_create(rsa_private_key_rules);
- status = dd->decode(dd, chunk, this);
- dd->destroy(dd);
- if (status != SUCCESS)
- {
- destroy(this);
- return NULL;
- }
- this->k = (mpz_sizeinbase(this->n, 2) + 7) / 8;
- return &this->public;
-}
-
-/*
- * see header
- */
-rsa_private_key_t *rsa_private_key_create_from_file(char *filename, char *passphrase)
-{
- chunk_t chunk;
- struct stat stb;
- FILE *file;
- char *buffer;
-
- if (stat(filename, &stb) == -1)
- {
- return NULL;
- }
-
- buffer = alloca(stb.st_size);
-
- file = fopen(filename, "r");
- if (file == NULL)
- {
- return NULL;
- }
-
- if (fread(buffer, stb.st_size, 1, file) != 1)
- {
- return NULL;
- }
-
- chunk.ptr = buffer;
- chunk.len = stb.st_size;
-
- return rsa_private_key_create_from_chunk(chunk);
-}