Author: Pekka Riikonen <priikone@silcnet.org>
- Copyright (C) 2003 Pekka Riikonen
+ Copyright (C) 2003 - 2008 Pekka Riikonen
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
GNU General Public License for more details.
*/
-/* $Id$ */
-#include "silcincludes.h"
-#include "silcpkcs1.h"
+#include "silccrypto.h"
+#include "rsa.h"
+#include "silcpkcs1_i.h"
+
+/************************** PKCS #1 message format ***************************/
/* Minimum padding in block */
#define SILC_PKCS1_MIN_PADDING 8
success. */
SilcBool silc_pkcs1_encode(SilcPkcs1BlockType bt,
- const unsigned char *data,
- SilcUInt32 data_len,
- unsigned char *dest_data,
- SilcUInt32 dest_data_size,
- SilcRng rng)
+ const unsigned char *data,
+ SilcUInt32 data_len,
+ unsigned char *dest_data,
+ SilcUInt32 dest_data_size,
+ SilcRng rng)
{
SilcInt32 padlen;
int i;
SILC_LOG_DEBUG(("PKCS#1 encoding, bt %d", bt));
if (!data || !dest_data ||
- dest_data_size < 3 || dest_data_size < data_len) {
+ dest_data_size < SILC_PKCS1_MIN_PADDING + 3 ||
+ dest_data_size < data_len) {
SILC_LOG_DEBUG(("Data to be encoded is too long"));
return FALSE;
}
case SILC_PKCS1_BT_PUB:
/* Encryption */
+ if (!rng) {
+ SILC_LOG_ERROR(("Cannot encrypt: random number generator not provided"));
+ return FALSE;
+ }
/* It is guaranteed this routine does not return zero byte. */
- if (rng)
- for (i = 2; i < padlen; i++)
- dest_data[i] = silc_rng_get_byte_fast(rng);
- else
- for (i = 2; i < padlen; i++)
- dest_data[i] = silc_rng_global_get_byte_fast();
+ for (i = 2; i < padlen; i++)
+ dest_data[i] = silc_rng_get_byte_fast(rng);
+
break;
}
Returns TRUE on success. */
SilcBool silc_pkcs1_decode(SilcPkcs1BlockType bt,
- const unsigned char *data,
- SilcUInt32 data_len,
- unsigned char *dest_data,
- SilcUInt32 dest_data_size,
- SilcUInt32 *dest_len)
+ const unsigned char *data,
+ SilcUInt32 data_len,
+ unsigned char *dest_data,
+ SilcUInt32 dest_data_size,
+ SilcUInt32 *dest_len)
{
- int i = 0;
+ SilcUInt32 i = 0;
SILC_LOG_DEBUG(("PKCS#1 decoding, bt %d", bt));
}
/* Sanity checks */
+ if (i >= data_len) {
+ SILC_LOG_DEBUG(("Malformed block, too short message"));
+ return FALSE;
+ }
+ if (i < SILC_PKCS1_MIN_PADDING) {
+ SILC_LOG_DEBUG(("Malformed block, too short padding"));
+ return FALSE;
+ }
if (data[i++] != 0x00) {
SILC_LOG_DEBUG(("Malformed block"));
return FALSE;
}
- if (i - 1 < SILC_PKCS1_MIN_PADDING) {
- SILC_LOG_DEBUG(("Malformed block"));
+ if (i >= data_len) {
+ SILC_LOG_DEBUG(("Malformed block, too short message"));
return FALSE;
}
if (dest_data_size < data_len - i) {
return TRUE;
}
+
+
+/***************************** PKCS #1 PKCS API ******************************/
+
+/* Generates RSA key pair. */
+
+SILC_PKCS_ALG_GENERATE_KEY(silc_pkcs1_generate_key)
+{
+ SilcUInt32 prime_bits = keylen / 2;
+ SilcMPInt p, q;
+ SilcBool found = FALSE;
+
+ if (keylen < 768 || keylen > 16384)
+ return FALSE;
+
+ silc_mp_init(&p);
+ silc_mp_init(&q);
+
+ /* Find p and q */
+ while (!found) {
+ silc_math_gen_prime(&p, prime_bits, FALSE, rng);
+ silc_math_gen_prime(&q, prime_bits, FALSE, rng);
+ if ((silc_mp_cmp(&p, &q)) != 0)
+ found = TRUE;
+ }
+
+ /* If p is smaller than q, switch them */
+ if ((silc_mp_cmp(&p, &q)) > 0) {
+ SilcMPInt hlp;
+ silc_mp_init(&hlp);
+
+ silc_mp_set(&hlp, &p);
+ silc_mp_set(&p, &q);
+ silc_mp_set(&q, &hlp);
+
+ silc_mp_uninit(&hlp);
+ }
+
+ /* Generate the actual keys */
+ if (!silc_rsa_generate_keys(keylen, &p, &q, ret_public_key, ret_private_key))
+ return FALSE;
+
+ silc_mp_uninit(&p);
+ silc_mp_uninit(&q);
+
+ return TRUE;
+}
+
+/* Import PKCS #1 compliant public key */
+
+SILC_PKCS_ALG_IMPORT_PUBLIC_KEY(silc_pkcs1_import_public_key)
+{
+ SilcAsn1 asn1 = NULL;
+ SilcBufferStruct alg_key;
+ RsaPublicKey *pubkey;
+
+ if (!ret_public_key)
+ return 0;
+
+ asn1 = silc_asn1_alloc(NULL);
+ if (!asn1)
+ return 0;
+
+ /* Allocate RSA public key */
+ *ret_public_key = pubkey = silc_calloc(1, sizeof(*pubkey));
+ if (!pubkey)
+ goto err;
+
+ /* Parse the PKCS #1 public key */
+ silc_buffer_set(&alg_key, key, key_len);
+ if (!silc_asn1_decode(asn1, &alg_key,
+ SILC_ASN1_OPTS(SILC_ASN1_ALLOC),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_INT(&pubkey->n),
+ SILC_ASN1_INT(&pubkey->e),
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ /* Set key length */
+ pubkey->bits = ((silc_mp_sizeinbase(&pubkey->n, 2) + 7) / 8) * 8;
+
+ silc_asn1_free(asn1);
+
+ return key_len;
+
+ err:
+ silc_free(pubkey);
+ silc_asn1_free(asn1);
+ return 0;
+}
+
+/* Export PKCS #1 compliant public key */
+
+SILC_PKCS_ALG_EXPORT_PUBLIC_KEY(silc_pkcs1_export_public_key)
+{
+ RsaPublicKey *key = public_key;
+ SilcAsn1 asn1 = NULL;
+ SilcBufferStruct alg_key;
+ unsigned char *ret;
+
+ asn1 = silc_asn1_alloc(stack);
+ if (!asn1)
+ goto err;
+
+ /* Encode to PKCS #1 public key */
+ memset(&alg_key, 0, sizeof(alg_key));
+ if (!silc_asn1_encode(asn1, &alg_key,
+ SILC_ASN1_OPTS(SILC_ASN1_ALLOC),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_INT(&key->n),
+ SILC_ASN1_INT(&key->e),
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ ret = silc_buffer_steal(&alg_key, ret_len);
+ silc_asn1_free(asn1);
+
+ return ret;
+
+ err:
+ if (asn1)
+ silc_asn1_free(asn1);
+ return NULL;
+}
+
+/* Returns key length */
+
+SILC_PKCS_ALG_PUBLIC_KEY_BITLEN(silc_pkcs1_public_key_bitlen)
+{
+ RsaPublicKey *key = public_key;
+ return key->bits;
+}
+
+/* Copy public key */
+
+SILC_PKCS_ALG_PUBLIC_KEY_COPY(silc_pkcs1_public_key_copy)
+{
+ RsaPublicKey *key = public_key, *new_key;
+
+ new_key = silc_calloc(1, sizeof(*new_key));
+ if (!new_key)
+ return NULL;
+
+ silc_mp_init(&new_key->n);
+ silc_mp_init(&new_key->e);
+ silc_mp_set(&new_key->n, &key->n);
+ silc_mp_set(&new_key->e, &key->e);
+ new_key->bits = key->bits;
+
+ return new_key;
+}
+
+/* Compare public keys */
+
+SILC_PKCS_ALG_PUBLIC_KEY_COMPARE(silc_pkcs1_public_key_compare)
+{
+ RsaPublicKey *k1 = key1, *k2 = key2;
+
+ if (k1->bits != k2->bits)
+ return FALSE;
+ if (silc_mp_cmp(&k1->e, &k2->e) != 0)
+ return FALSE;
+ if (silc_mp_cmp(&k1->n, &k2->n) != 0)
+ return FALSE;
+
+ return TRUE;
+}
+
+/* Frees public key */
+
+SILC_PKCS_ALG_PUBLIC_KEY_FREE(silc_pkcs1_public_key_free)
+{
+ RsaPublicKey *key = public_key;
+
+ silc_mp_uninit(&key->n);
+ silc_mp_uninit(&key->e);
+ silc_hash_free(key->hash);
+ silc_free(key);
+}
+
+/* Import PKCS #1 compliant private key */
+
+SILC_PKCS_ALG_IMPORT_PRIVATE_KEY(silc_pkcs1_import_private_key)
+{
+ SilcAsn1 asn1;
+ SilcBufferStruct alg_key;
+ RsaPrivateKey *privkey;
+ SilcUInt32 ver;
+
+ if (!ret_private_key)
+ return 0;
+
+ asn1 = silc_asn1_alloc(NULL);
+ if (!asn1)
+ return 0;
+
+ /* Allocate RSA private key */
+ *ret_private_key = privkey = silc_calloc(1, sizeof(*privkey));
+ if (!privkey)
+ goto err;
+
+ /* Parse the PKCS #1 private key */
+ silc_buffer_set(&alg_key, key, key_len);
+ if (!silc_asn1_decode(asn1, &alg_key,
+ SILC_ASN1_OPTS(SILC_ASN1_ALLOC),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_SHORT_INT(&ver),
+ SILC_ASN1_INT(&privkey->n),
+ SILC_ASN1_INT(&privkey->e),
+ SILC_ASN1_INT(&privkey->d),
+ SILC_ASN1_INT(&privkey->p),
+ SILC_ASN1_INT(&privkey->q),
+ SILC_ASN1_INT(&privkey->dP),
+ SILC_ASN1_INT(&privkey->dQ),
+ SILC_ASN1_INT(&privkey->qP),
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ if (ver != 0)
+ goto err;
+
+ /* Set key length */
+ privkey->bits = ((silc_mp_sizeinbase(&privkey->n, 2) + 7) / 8) * 8;
+
+ silc_asn1_free(asn1);
+
+ return key_len;
+
+ err:
+ silc_free(privkey);
+ silc_asn1_free(asn1);
+ return 0;
+}
+
+/* Export PKCS #1 compliant private key */
+
+SILC_PKCS_ALG_EXPORT_PRIVATE_KEY(silc_pkcs1_export_private_key)
+{
+ RsaPrivateKey *key = private_key;
+ SilcAsn1 asn1;
+ SilcBufferStruct alg_key;
+ unsigned char *ret;
+
+ asn1 = silc_asn1_alloc(stack);
+ if (!asn1)
+ return FALSE;
+
+ /* Encode to PKCS #1 private key */
+ memset(&alg_key, 0, sizeof(alg_key));
+ if (!silc_asn1_encode(asn1, &alg_key,
+ SILC_ASN1_OPTS(SILC_ASN1_ALLOC),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_SHORT_INT(0),
+ SILC_ASN1_INT(&key->n),
+ SILC_ASN1_INT(&key->e),
+ SILC_ASN1_INT(&key->d),
+ SILC_ASN1_INT(&key->p),
+ SILC_ASN1_INT(&key->q),
+ SILC_ASN1_INT(&key->dP),
+ SILC_ASN1_INT(&key->dQ),
+ SILC_ASN1_INT(&key->qP),
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ ret = silc_buffer_steal(&alg_key, ret_len);
+ silc_asn1_free(asn1);
+
+ return ret;
+
+ err:
+ silc_asn1_free(asn1);
+ return NULL;
+}
+
+/* Returns key length */
+
+SILC_PKCS_ALG_PRIVATE_KEY_BITLEN(silc_pkcs1_private_key_bitlen)
+{
+ RsaPrivateKey *key = private_key;
+ return key->bits;
+}
+
+/* Frees private key */
+
+SILC_PKCS_ALG_PRIVATE_KEY_FREE(silc_pkcs1_private_key_free)
+{
+ RsaPrivateKey *key = private_key;
+
+ silc_mp_uninit(&key->n);
+ silc_mp_uninit(&key->e);
+ silc_mp_uninit(&key->d);
+ silc_mp_uninit(&key->dP);
+ silc_mp_uninit(&key->dQ);
+ silc_mp_uninit(&key->qP);
+ silc_mp_uninit(&key->p);
+ silc_mp_uninit(&key->q);
+ silc_hash_free(key->hash);
+ silc_free(key);
+}
+
+/* PKCS #1 RSA routines */
+
+SILC_PKCS_ALG_ENCRYPT(silc_pkcs1_encrypt)
+{
+ RsaPublicKey *key = public_key;
+ SilcMPInt mp_tmp;
+ SilcMPInt mp_dst;
+ unsigned char padded[2048 + 1];
+ SilcUInt32 len = (key->bits + 7) / 8;
+ SilcStack stack;
+
+ if (sizeof(padded) < len) {
+ encrypt_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ /* Pad data */
+ if (!silc_pkcs1_encode(SILC_PKCS1_BT_PUB, src, src_len,
+ padded, len, rng)) {
+ encrypt_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ silc_mp_sinit(stack, &mp_tmp);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Data to MP */
+ silc_mp_bin2mp(padded, len, &mp_tmp);
+
+ /* Encrypt */
+ silc_rsa_public_operation(key, &mp_tmp, &mp_dst);
+
+ /* MP to data */
+ silc_mp_mp2bin_noalloc(&mp_dst, padded, len);
+
+ /* Deliver result */
+ encrypt_cb(TRUE, padded, len, context);
+
+ memset(padded, 0, sizeof(padded));
+ silc_mp_uninit(&mp_tmp);
+ silc_mp_uninit(&mp_dst);
+ silc_stack_free(stack);
+
+ return NULL;
+}
+
+SILC_PKCS_ALG_DECRYPT(silc_pkcs1_decrypt)
+{
+ RsaPrivateKey *key = private_key;
+ SilcMPInt mp_tmp;
+ SilcMPInt mp_dst;
+ unsigned char *padded, unpadded[2048 + 1];
+ SilcUInt32 padded_len, dst_len;
+ SilcStack stack;
+
+ if (sizeof(unpadded) < (key->bits + 7) / 8) {
+ decrypt_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ silc_mp_sinit(stack, &mp_tmp);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Data to MP */
+ silc_mp_bin2mp(src, src_len, &mp_tmp);
+
+ /* Decrypt */
+ silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
+
+ /* MP to data */
+ padded = silc_mp_mp2bin(&mp_dst, (key->bits + 7) / 8, &padded_len);
+
+ /* Unpad data */
+ if (!silc_pkcs1_decode(SILC_PKCS1_BT_PUB, padded, padded_len,
+ unpadded, sizeof(unpadded), &dst_len)) {
+ memset(padded, 0, padded_len);
+ silc_free(padded);
+ silc_mp_uninit(&mp_tmp);
+ silc_mp_uninit(&mp_dst);
+ decrypt_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ /* Deliver result */
+ decrypt_cb(TRUE, unpadded, dst_len, context);
+
+ memset(padded, 0, padded_len);
+ memset(unpadded, 0, sizeof(unpadded));
+ silc_free(padded);
+ silc_mp_uninit(&mp_tmp);
+ silc_mp_uninit(&mp_dst);
+ silc_stack_free(stack);
+
+ return NULL;
+}
+
+/* PKCS #1 sign with appendix, hash OID included in the signature */
+
+SILC_PKCS_ALG_SIGN(silc_pkcs1_sign)
+{
+ RsaPrivateKey *key = private_key;
+ unsigned char padded[2048 + 1], hashr[SILC_HASH_MAXLEN];
+ SilcMPInt mp_tmp;
+ SilcMPInt mp_dst;
+ SilcBufferStruct di;
+ SilcUInt32 len = (key->bits + 7) / 8;
+ const char *oid;
+ SilcStack stack;
+ SilcAsn1 asn1;
+
+ SILC_LOG_DEBUG(("Sign"));
+
+ if (sizeof(padded) < len) {
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ oid = silc_hash_get_oid(hash);
+ if (!oid) {
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ asn1 = silc_asn1_alloc(stack);
+ if (!asn1) {
+ silc_stack_free(stack);
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ /* Compute hash */
+ if (compute_hash) {
+ if (!hash)
+ hash = key->hash;
+ silc_hash_make(hash, src, src_len, hashr);
+ src = hashr;
+ src_len = silc_hash_len(hash);
+ }
+
+ /* Encode digest info */
+ memset(&di, 0, sizeof(di));
+ if (!silc_asn1_encode(asn1, &di,
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_OID(oid),
+ SILC_ASN1_NULL(TRUE),
+ SILC_ASN1_END,
+ SILC_ASN1_OCTET_STRING(src, src_len),
+ SILC_ASN1_END, SILC_ASN1_END)) {
+ silc_asn1_free(asn1);
+ silc_stack_free(stack);
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+ SILC_LOG_HEXDUMP(("DigestInfo"), silc_buffer_data(&di),
+ silc_buffer_len(&di));
+
+ /* Pad data */
+ if (!silc_pkcs1_encode(SILC_PKCS1_BT_PRV1, silc_buffer_data(&di),
+ silc_buffer_len(&di), padded, len, NULL)) {
+ silc_asn1_free(asn1);
+ silc_stack_free(stack);
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ silc_mp_sinit(stack, &mp_tmp);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Data to MP */
+ silc_mp_bin2mp(padded, len, &mp_tmp);
+
+ /* Sign */
+ silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
+
+ /* MP to data */
+ silc_mp_mp2bin_noalloc(&mp_dst, padded, len);
+
+ /* Deliver result */
+ sign_cb(TRUE, padded, len, context);
+
+ memset(padded, 0, sizeof(padded));
+ if (compute_hash)
+ memset(hashr, 0, sizeof(hashr));
+ silc_mp_uninit(&mp_tmp);
+ silc_mp_uninit(&mp_dst);
+ silc_asn1_free(asn1);
+ silc_stack_free(stack);
+
+ return NULL;
+}
+
+/* PKCS #1 verification with appendix. */
+
+SILC_PKCS_ALG_VERIFY(silc_pkcs1_verify)
+{
+ RsaPublicKey *key = public_key;
+ SilcBool ret = FALSE;
+ SilcMPInt mp_tmp2;
+ SilcMPInt mp_dst;
+ unsigned char *verify, unpadded[2048 + 1], hashr[SILC_HASH_MAXLEN];
+ SilcUInt32 verify_len, len = (key->bits + 7) / 8;
+ SilcBufferStruct di, ldi;
+ SilcBool has_null = TRUE;
+ SilcHash ihash = NULL;
+ SilcStack stack;
+ SilcAsn1 asn1;
+ char *oid;
+
+ SILC_LOG_DEBUG(("Verify signature"));
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ asn1 = silc_asn1_alloc(stack);
+ if (!asn1) {
+ verify_cb(FALSE, context);
+ return NULL;
+ }
+
+ silc_mp_sinit(stack, &mp_tmp2);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Format the signature into MP int */
+ silc_mp_bin2mp(signature, signature_len, &mp_tmp2);
+
+ /* Verify */
+ silc_rsa_public_operation(key, &mp_tmp2, &mp_dst);
+
+ /* MP to data */
+ verify = silc_mp_mp2bin(&mp_dst, len, &verify_len);
+
+ /* Unpad data */
+ if (!silc_pkcs1_decode(SILC_PKCS1_BT_PRV1, verify, verify_len,
+ unpadded, sizeof(unpadded), &len))
+ goto err;
+ silc_buffer_set(&di, unpadded, len);
+
+ /* If hash isn't given, allocate the one given in digest info */
+ if (compute_hash) {
+ if (!hash) {
+ has_null = FALSE;
+
+ /* Decode digest info */
+ if (!silc_asn1_decode(asn1, &di,
+ SILC_ASN1_OPTS(SILC_ASN1_ACCUMUL),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_OID(&oid),
+ SILC_ASN1_NULL_T(SILC_ASN1_OPTIONAL,
+ SILC_ASN1_TAG_NULL, &has_null),
+ SILC_ASN1_END,
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ if (!silc_hash_alloc_by_oid(oid, &ihash)) {
+ SILC_LOG_DEBUG(("Unknown OID %s", oid));
+ goto err;
+ }
+ hash = ihash;
+ }
+
+ /* Hash the data */
+ silc_hash_make(hash, data, data_len, hashr);
+ data = hashr;
+ data_len = silc_hash_len(hash);
+ oid = (char *)silc_hash_get_oid(hash);
+ }
+
+ /* Encode digest info for comparison */
+ memset(&ldi, 0, sizeof(ldi));
+ if (!silc_asn1_encode(asn1, &ldi,
+ SILC_ASN1_OPTS(SILC_ASN1_ACCUMUL),
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_SEQUENCE,
+ SILC_ASN1_OID(oid),
+ SILC_ASN1_NULL(has_null),
+ SILC_ASN1_END,
+ SILC_ASN1_OCTET_STRING(data, data_len),
+ SILC_ASN1_END, SILC_ASN1_END))
+ goto err;
+
+ SILC_LOG_HEXDUMP(("DigestInfo remote"), silc_buffer_data(&di),
+ silc_buffer_len(&di));
+ SILC_LOG_HEXDUMP(("DigestInfo local"), silc_buffer_data(&ldi),
+ silc_buffer_len(&ldi));
+
+ /* Compare */
+ if (silc_buffer_len(&di) == silc_buffer_len(&ldi) &&
+ !memcmp(silc_buffer_data(&di), silc_buffer_data(&ldi),
+ silc_buffer_len(&ldi)))
+ ret = TRUE;
+
+ /* Deliver result */
+ verify_cb(ret, context);
+
+ memset(verify, 0, verify_len);
+ memset(unpadded, 0, sizeof(unpadded));
+ silc_free(verify);
+ silc_mp_uninit(&mp_tmp2);
+ silc_mp_uninit(&mp_dst);
+ if (compute_hash)
+ memset(hashr, 0, sizeof(hashr));
+ if (ihash)
+ silc_hash_free(ihash);
+ silc_asn1_free(asn1);
+ silc_stack_free(stack);
+
+ return NULL;
+
+ err:
+ memset(verify, 0, verify_len);
+ silc_free(verify);
+ silc_mp_uninit(&mp_tmp2);
+ silc_mp_uninit(&mp_dst);
+ if (ihash)
+ silc_hash_free(ihash);
+ silc_asn1_free(asn1);
+ silc_stack_free(stack);
+
+ verify_cb(FALSE, context);
+ return NULL;
+}
+
+/* PKCS #1 sign without hash oid */
+
+SILC_PKCS_ALG_SIGN(silc_pkcs1_sign_no_oid)
+{
+ RsaPrivateKey *key = private_key;
+ SilcMPInt mp_tmp;
+ SilcMPInt mp_dst;
+ unsigned char padded[2048 + 1], hashr[SILC_HASH_MAXLEN];
+ SilcUInt32 len = (key->bits + 7) / 8;
+ SilcStack stack;
+
+ SILC_LOG_DEBUG(("Sign"));
+
+ if (sizeof(padded) < len) {
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ /* Compute hash if requested */
+ if (compute_hash) {
+ if (!hash)
+ hash = key->hash;
+ silc_hash_make(hash, src, src_len, hashr);
+ src = hashr;
+ src_len = silc_hash_len(hash);
+ }
+
+ /* Pad data */
+ if (!silc_pkcs1_encode(SILC_PKCS1_BT_PRV1, src, src_len,
+ padded, len, NULL)) {
+ sign_cb(FALSE, NULL, 0, context);
+ return NULL;
+ }
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ silc_mp_sinit(stack, &mp_tmp);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Data to MP */
+ silc_mp_bin2mp(padded, len, &mp_tmp);
+
+ /* Sign */
+ silc_rsa_private_operation(key, &mp_tmp, &mp_dst);
+
+ /* MP to data */
+ silc_mp_mp2bin_noalloc(&mp_dst, padded, len);
+
+ /* Deliver result */
+ sign_cb(TRUE, padded, len, context);
+
+ memset(padded, 0, sizeof(padded));
+ if (compute_hash)
+ memset(hashr, 0, sizeof(hashr));
+ silc_mp_uninit(&mp_tmp);
+ silc_mp_uninit(&mp_dst);
+ silc_stack_free(stack);
+
+ return NULL;
+}
+
+/* PKCS #1 verify without hash oid */
+
+SILC_PKCS_ALG_VERIFY(silc_pkcs1_verify_no_oid)
+{
+ RsaPublicKey *key = public_key;
+ SilcBool ret = FALSE;
+ SilcMPInt mp_tmp2;
+ SilcMPInt mp_dst;
+ unsigned char *verify, unpadded[2048 + 1], hashr[SILC_HASH_MAXLEN];
+ SilcUInt32 verify_len, len = (key->bits + 7) / 8;
+ SilcStack stack;
+
+ SILC_LOG_DEBUG(("Verify signature"));
+
+ stack = silc_stack_alloc(2048, silc_crypto_stack());
+
+ silc_mp_sinit(stack, &mp_tmp2);
+ silc_mp_sinit(stack, &mp_dst);
+
+ /* Format the signature into MP int */
+ silc_mp_bin2mp(signature, signature_len, &mp_tmp2);
+
+ /* Verify */
+ silc_rsa_public_operation(key, &mp_tmp2, &mp_dst);
+
+ /* MP to data */
+ verify = silc_mp_mp2bin(&mp_dst, len, &verify_len);
+
+ /* Unpad data */
+ if (!silc_pkcs1_decode(SILC_PKCS1_BT_PRV1, verify, verify_len,
+ unpadded, sizeof(unpadded), &len)) {
+ memset(verify, 0, verify_len);
+ silc_free(verify);
+ silc_mp_uninit(&mp_tmp2);
+ silc_mp_uninit(&mp_dst);
+ silc_stack_free(stack);
+ verify_cb(FALSE, context);
+ return NULL;
+ }
+
+ /* Hash data if requested */
+ if (compute_hash) {
+ if (!hash)
+ hash = key->hash;
+ silc_hash_make(hash, data, data_len, hashr);
+ data = hashr;
+ data_len = silc_hash_len(hash);
+ }
+
+ /* Compare */
+ if (len == data_len && !memcmp(data, unpadded, len))
+ ret = TRUE;
+
+ /* Deliver result */
+ verify_cb(ret, context);
+
+ memset(verify, 0, verify_len);
+ memset(unpadded, 0, sizeof(unpadded));
+ if (compute_hash)
+ memset(hashr, 0, sizeof(hashr));
+ silc_free(verify);
+ silc_mp_uninit(&mp_tmp2);
+ silc_mp_uninit(&mp_dst);
+ silc_stack_free(stack);
+
+ return NULL;
+}
projects / crypto.git / blobdiff