crypto_internal.c - platform/external/wpa_supplicant - Git at Google

 /*
  * WPA Supplicant / Crypto wrapper for internal crypto implementation
  * Copyright (c) 2006, Jouni Malinen <[email protected]>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * Alternatively, this software may be distributed under the terms of BSD
  * license.
  *
  * See README and COPYING for more details.
  */

 #include "includes.h"

 #include "common.h"
 #include "crypto.h"
 #include "md5.h"
 #include "sha1.h"
 #include "rc4.h"
 #include "aes.h"
 #include "rsa.h"
 #include "bignum.h"


 #ifdef EAP_TLS_FUNCS

 #ifdef CONFIG_TLS_INTERNAL

 /* from des.c */
 struct des3_key_s {
 	u32 ek[3][32];
 	u32 dk[3][32];
 };

 void des3_key_setup(const u8 *key, struct des3_key_s *dkey);
 void des3_encrypt(const u8 *plain, const struct des3_key_s *key, u8 *crypt);
 void des3_decrypt(const u8 *crypt, const struct des3_key_s *key, u8 *plain);


 struct MD5Context {
 	u32 buf[4];
 	u32 bits[2];
 	u8 in[64];
 };

 struct SHA1Context {
 	u32 state[5];
 	u32 count[2];
 	unsigned char buffer[64];
 };


 struct crypto_hash {
 	enum crypto_hash_alg alg;
 	union {
 		struct MD5Context md5;
 		struct SHA1Context sha1;
 	} u;
 	u8 key[64];
 	size_t key_len;
 };


 struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
 				      size_t key_len)
 {
 	struct crypto_hash *ctx;
 	u8 k_pad[64];
 	u8 tk[20];
 	size_t i;

 	ctx = os_zalloc(sizeof(*ctx));
 	if (ctx == NULL)
 		return NULL;

 	ctx->alg = alg;

 	switch (alg) {
 	case CRYPTO_HASH_ALG_MD5:
 		MD5Init(&ctx->u.md5);
 		break;
 	case CRYPTO_HASH_ALG_SHA1:
 		SHA1Init(&ctx->u.sha1);
 		break;
 	case CRYPTO_HASH_ALG_HMAC_MD5:
 		if (key_len > sizeof(k_pad)) {
 			MD5Init(&ctx->u.md5);
 			MD5Update(&ctx->u.md5, key, key_len);
 			MD5Final(tk, &ctx->u.md5);
 			key = tk;
 			key_len = 16;
 		}
 		os_memcpy(ctx->key, key, key_len);
 		ctx->key_len = key_len;

 		os_memcpy(k_pad, key, key_len);
 		os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
 		for (i = 0; i < sizeof(k_pad); i++)
 			k_pad[i] ^= 0x36;
 		MD5Init(&ctx->u.md5);
 		MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
 		break;
 	case CRYPTO_HASH_ALG_HMAC_SHA1:
 		if (key_len > sizeof(k_pad)) {
 			SHA1Init(&ctx->u.sha1);
 			SHA1Update(&ctx->u.sha1, key, key_len);
 			SHA1Final(tk, &ctx->u.sha1);
 			key = tk;
 			key_len = 20;
 		}
 		os_memcpy(ctx->key, key, key_len);
 		ctx->key_len = key_len;

 		os_memcpy(k_pad, key, key_len);
 		os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
 		for (i = 0; i < sizeof(k_pad); i++)
 			k_pad[i] ^= 0x36;
 		SHA1Init(&ctx->u.sha1);
 		SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
 		break;
 	default:
 		os_free(ctx);
 		return NULL;
 	}

 	return ctx;
 }


 void crypto_hash_update(struct crypto_hash *ctx, const u8 *data, size_t len)
 {
 	if (ctx == NULL)
 		return;

 	switch (ctx->alg) {
 	case CRYPTO_HASH_ALG_MD5:
 	case CRYPTO_HASH_ALG_HMAC_MD5:
 		MD5Update(&ctx->u.md5, data, len);
 		break;
 	case CRYPTO_HASH_ALG_SHA1:
 	case CRYPTO_HASH_ALG_HMAC_SHA1:
 		SHA1Update(&ctx->u.sha1, data, len);
 		break;
 	}
 }


 int crypto_hash_finish(struct crypto_hash *ctx, u8 *mac, size_t *len)
 {
 	u8 k_pad[64];
 	size_t i;

 	if (ctx == NULL)
 		return -2;

 	if (mac == NULL || len == NULL) {
 		os_free(ctx);
 		return 0;
 	}

 	switch (ctx->alg) {
 	case CRYPTO_HASH_ALG_MD5:
 		if (*len < 16) {
 			*len = 16;
 			os_free(ctx);
 			return -1;
 		}
 		*len = 16;
 		MD5Final(mac, &ctx->u.md5);
 		break;
 	case CRYPTO_HASH_ALG_SHA1:
 		if (*len < 20) {
 			*len = 20;
 			os_free(ctx);
 			return -1;
 		}
 		*len = 20;
 		SHA1Final(mac, &ctx->u.sha1);
 		break;
 	case CRYPTO_HASH_ALG_HMAC_MD5:
 		if (*len < 16) {
 			*len = 16;
 			os_free(ctx);
 			return -1;
 		}
 		*len = 16;

 		MD5Final(mac, &ctx->u.md5);

 		os_memcpy(k_pad, ctx->key, ctx->key_len);
 		os_memset(k_pad + ctx->key_len, 0,
 			  sizeof(k_pad) - ctx->key_len);
 		for (i = 0; i < sizeof(k_pad); i++)
 			k_pad[i] ^= 0x5c;
 		MD5Init(&ctx->u.md5);
 		MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
 		MD5Update(&ctx->u.md5, mac, 16);
 		MD5Final(mac, &ctx->u.md5);
 		break;
 	case CRYPTO_HASH_ALG_HMAC_SHA1:
 		if (*len < 20) {
 			*len = 20;
 			os_free(ctx);
 			return -1;
 		}
 		*len = 20;

 		SHA1Final(mac, &ctx->u.sha1);

 		os_memcpy(k_pad, ctx->key, ctx->key_len);
 		os_memset(k_pad + ctx->key_len, 0,
 			  sizeof(k_pad) - ctx->key_len);
 		for (i = 0; i < sizeof(k_pad); i++)
 			k_pad[i] ^= 0x5c;
 		SHA1Init(&ctx->u.sha1);
 		SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
 		SHA1Update(&ctx->u.sha1, mac, 20);
 		SHA1Final(mac, &ctx->u.sha1);
 		break;
 	}

 	os_free(ctx);

 	return 0;
 }


 struct crypto_cipher {
 	enum crypto_cipher_alg alg;
 	union {
 		struct {
 			size_t used_bytes;
 			u8 key[16];
 			size_t keylen;
 		} rc4;
 		struct {
 			u8 cbc[32];
 			size_t block_size;
 			void *ctx_enc;
 			void *ctx_dec;
 		} aes;
 		struct {
 			struct des3_key_s key;
 			u8 cbc[8];
 		} des3;
 	} u;
 };


 struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
 					  const u8 *iv, const u8 *key,
 					  size_t key_len)
 {
 	struct crypto_cipher *ctx;

 	ctx = os_zalloc(sizeof(*ctx));
 	if (ctx == NULL)
 		return NULL;

 	ctx->alg = alg;

 	switch (alg) {
 	case CRYPTO_CIPHER_ALG_RC4:
 		if (key_len > sizeof(ctx->u.rc4.key)) {
 			os_free(ctx);
 			return NULL;
 		}
 		ctx->u.rc4.keylen = key_len;
 		os_memcpy(ctx->u.rc4.key, key, key_len);
 		break;
 	case CRYPTO_CIPHER_ALG_AES:
 		if (key_len > sizeof(ctx->u.aes.cbc)) {
 			os_free(ctx);
 			return NULL;
 		}
 		ctx->u.aes.ctx_enc = aes_encrypt_init(key, key_len);
 		if (ctx->u.aes.ctx_enc == NULL) {
 			os_free(ctx);
 			return NULL;
 		}
 		ctx->u.aes.ctx_dec = aes_decrypt_init(key, key_len);
 		if (ctx->u.aes.ctx_dec == NULL) {
 			aes_encrypt_deinit(ctx->u.aes.ctx_enc);
 			os_free(ctx);
 			return NULL;
 		}
 		ctx->u.aes.block_size = key_len;
 		os_memcpy(ctx->u.aes.cbc, iv, ctx->u.aes.block_size);
 		break;
 	case CRYPTO_CIPHER_ALG_3DES:
 		if (key_len != 24) {
 			os_free(ctx);
 			return NULL;
 		}
 		des3_key_setup(key, &ctx->u.des3.key);
 		os_memcpy(ctx->u.des3.cbc, iv, 8);
 		break;
 	default:
 		os_free(ctx);
 		return NULL;
 	}

 	return ctx;
 }


 int crypto_cipher_encrypt(struct crypto_cipher *ctx, const u8 *plain,
 			  u8 *crypt, size_t len)
 {
 	size_t i, j, blocks;

 	switch (ctx->alg) {
 	case CRYPTO_CIPHER_ALG_RC4:
 		if (plain != crypt)
 			os_memcpy(crypt, plain, len);
 		rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
 			 ctx->u.rc4.used_bytes, crypt, len);
 		ctx->u.rc4.used_bytes += len;
 		break;
 	case CRYPTO_CIPHER_ALG_AES:
 		if (len % ctx->u.aes.block_size)
 			return -1;
 		blocks = len / ctx->u.aes.block_size;
 		for (i = 0; i < blocks; i++) {
 			for (j = 0; j < ctx->u.aes.block_size; j++)
 				ctx->u.aes.cbc[j] ^= plain[j];
 			aes_encrypt(ctx->u.aes.ctx_enc, ctx->u.aes.cbc,
 				    ctx->u.aes.cbc);
 			os_memcpy(crypt, ctx->u.aes.cbc,
 				  ctx->u.aes.block_size);
 			plain += ctx->u.aes.block_size;
 			crypt += ctx->u.aes.block_size;
 		}
 		break;
 	case CRYPTO_CIPHER_ALG_3DES:
 		if (len % 8)
 			return -1;
 		blocks = len / 8;
 		for (i = 0; i < blocks; i++) {
 			for (j = 0; j < 8; j++)
 				ctx->u.des3.cbc[j] ^= plain[j];
 			des3_encrypt(ctx->u.des3.cbc, &ctx->u.des3.key,
 				     ctx->u.des3.cbc);
 			os_memcpy(crypt, ctx->u.des3.cbc, 8);
 			plain += 8;
 			crypt += 8;
 		}
 		break;
 	default:
 		return -1;
 	}

 	return 0;
 }


 int crypto_cipher_decrypt(struct crypto_cipher *ctx, const u8 *crypt,
 			  u8 *plain, size_t len)
 {
 	size_t i, j, blocks;
 	u8 tmp[32];

 	switch (ctx->alg) {
 	case CRYPTO_CIPHER_ALG_RC4:
 		if (plain != crypt)
 			os_memcpy(plain, crypt, len);
 		rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
 			 ctx->u.rc4.used_bytes, plain, len);
 		ctx->u.rc4.used_bytes += len;
 		break;
 	case CRYPTO_CIPHER_ALG_AES:
 		if (len % ctx->u.aes.block_size)
 			return -1;
 		blocks = len / ctx->u.aes.block_size;
 		for (i = 0; i < blocks; i++) {
 			os_memcpy(tmp, crypt, ctx->u.aes.block_size);
 			aes_decrypt(ctx->u.aes.ctx_dec, crypt, plain);
 			for (j = 0; j < ctx->u.aes.block_size; j++)
 				plain[j] ^= ctx->u.aes.cbc[j];
 			os_memcpy(ctx->u.aes.cbc, tmp, ctx->u.aes.block_size);
 			plain += ctx->u.aes.block_size;
 			crypt += ctx->u.aes.block_size;
 		}
 		break;
 	case CRYPTO_CIPHER_ALG_3DES:
 		if (len % 8)
 			return -1;
 		blocks = len / 8;
 		for (i = 0; i < blocks; i++) {
 			os_memcpy(tmp, crypt, 8);
 			des3_decrypt(crypt, &ctx->u.des3.key, plain);
 			for (j = 0; j < 8; j++)
 				plain[j] ^= ctx->u.des3.cbc[j];
 			os_memcpy(ctx->u.des3.cbc, tmp, 8);
 			plain += 8;
 			crypt += 8;
 		}
 		break;
 	default:
 		return -1;
 	}

 	return 0;
 }


 void crypto_cipher_deinit(struct crypto_cipher *ctx)
 {
 	switch (ctx->alg) {
 	case CRYPTO_CIPHER_ALG_AES:
 		aes_encrypt_deinit(ctx->u.aes.ctx_enc);
 		aes_decrypt_deinit(ctx->u.aes.ctx_dec);
 		break;
 	case CRYPTO_CIPHER_ALG_3DES:
 		break;
 	default:
 		break;
 	}
 	os_free(ctx);
 }


 /* Dummy structures; these are just typecast to struct crypto_rsa_key */
 struct crypto_public_key;
 struct crypto_private_key;


 struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
 {
 	return (struct crypto_public_key *)
 		crypto_rsa_import_public_key(key, len);
 }


 struct crypto_private_key * crypto_private_key_import(const u8 *key,
 						      size_t len)
 {
 	return (struct crypto_private_key *)
 		crypto_rsa_import_private_key(key, len);
 }


 struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
 						       size_t len)
 {
 	/* No X.509 support in crypto_internal.c */
 	return NULL;
 }


 static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
 					   const u8 *in, size_t inlen,
 					   u8 *out, size_t *outlen)
 {
 	size_t ps_len;
 	u8 *pos;

 	/*
 	 * PKCS #1 v1.5, 8.1:
 	 *
 	 * EB = 00 || BT || PS || 00 || D
 	 * BT = 00 or 01 for private-key operation; 02 for public-key operation
 	 * PS = k-3-||D||; at least eight octets
 	 * (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
 	 * k = length of modulus in octets (modlen)
 	 */

 	if (modlen < 12 || modlen > *outlen || inlen > modlen - 11) {
 		wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
 			   "lengths (modlen=%lu outlen=%lu inlen=%lu)",
 			   __func__, (unsigned long) modlen,
 			   (unsigned long) *outlen,
 			   (unsigned long) inlen);
 		return -1;
 	}

 	pos = out;
 	*pos++ = 0x00;
 	*pos++ = block_type; /* BT */
 	ps_len = modlen - inlen - 3;
 	switch (block_type) {
 	case 0:
 		os_memset(pos, 0x00, ps_len);
 		pos += ps_len;
 		break;
 	case 1:
 		os_memset(pos, 0xff, ps_len);
 		pos += ps_len;
 		break;
 	case 2:
 		if (os_get_random(pos, ps_len) < 0) {
 			wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
 				   "random data for PS", __func__);
 			return -1;
 		}
 		while (ps_len--) {
 			if (*pos == 0x00)
 				*pos = 0x01;
 			pos++;
 		}
 		break;
 	default:
 		wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
 			   "%d", __func__, block_type);
 		return -1;
 	}
 	*pos++ = 0x00;
 	os_memcpy(pos, in, inlen); /* D */

 	return 0;
 }


 static int crypto_rsa_encrypt_pkcs1(int block_type, struct crypto_rsa_key *key,
 				    int use_private,
 				    const u8 *in, size_t inlen,
 				    u8 *out, size_t *outlen)
 {
 	size_t modlen;

 	modlen = crypto_rsa_get_modulus_len(key);

 	if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
 					    out, outlen) < 0)
 		return -1;

 	return crypto_rsa_exptmod(out, modlen, out, outlen, key, use_private);
 }


 int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
 					const u8 *in, size_t inlen,
 					u8 *out, size_t *outlen)
 {
 	return crypto_rsa_encrypt_pkcs1(2, (struct crypto_rsa_key *) key,
 					0, in, inlen, out, outlen);
 }


 int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
 				  const u8 *in, size_t inlen,
 				  u8 *out, size_t *outlen)
 {
 	return crypto_rsa_encrypt_pkcs1(1, (struct crypto_rsa_key *) key,
 					1, in, inlen, out, outlen);
 }


 void crypto_public_key_free(struct crypto_public_key *key)
 {
 	crypto_rsa_free((struct crypto_rsa_key *) key);
 }


 void crypto_private_key_free(struct crypto_private_key *key)
 {
 	crypto_rsa_free((struct crypto_rsa_key *) key);
 }


 int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
 				    const u8 *crypt, size_t crypt_len,
 				    u8 *plain, size_t *plain_len)
 {
 	size_t len;
 	u8 *pos;

 	len = *plain_len;
 	if (crypto_rsa_exptmod(crypt, crypt_len, plain, &len,
 			       (struct crypto_rsa_key *) key, 0) < 0)
 		return -1;

 	/*
 	 * PKCS #1 v1.5, 8.1:
 	 *
 	 * EB = 00 || BT || PS || 00 || D
 	 * BT = 01
 	 * PS = k-3-||D|| times FF
 	 * k = length of modulus in octets
 	 */

 	if (len < 3 + 8 + 16 /* min hash len */ ||
 	    plain[0] != 0x00 || plain[1] != 0x01 || plain[2] != 0xff) {
 		wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
 			   "structure");
 		return -1;
 	}

 	pos = plain + 3;
 	while (pos < plain + len && *pos == 0xff)
 		pos++;
 	if (pos - plain - 2 < 8) {
 		/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
 		wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
 			   "padding");
 		return -1;
 	}

 	if (pos + 16 /* min hash len */ >= plain + len || *pos != 0x00) {
 		wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
 			   "structure (2)");
 		return -1;
 	}
 	pos++;
 	len -= pos - plain;

 	/* Strip PKCS #1 header */
 	os_memmove(plain, pos, len);
 	*plain_len = len;

 	return 0;
 }


 int crypto_global_init(void)
 {
 	return 0;
 }


 void crypto_global_deinit(void)
 {
 }


 #ifdef EAP_FAST

 int crypto_mod_exp(const u8 *base, size_t base_len,
 		   const u8 *power, size_t power_len,
 		   const u8 *modulus, size_t modulus_len,
 		   u8 *result, size_t *result_len)
 {
 	struct bignum *bn_base, *bn_exp, *bn_modulus, *bn_result;
 	int ret = 0;

 	bn_base = bignum_init();
 	bn_exp = bignum_init();
 	bn_modulus = bignum_init();
 	bn_result = bignum_init();

 	if (bn_base == NULL || bn_exp == NULL || bn_modulus == NULL ||
 	    bn_result == NULL)
 		goto error;

 	if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 ||
 	    bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 ||
 	    bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
 		goto error;

 	if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
 		goto error;

 	ret = bignum_get_unsigned_bin(bn_result, result, result_len);

 error:
 	bignum_deinit(bn_base);
 	bignum_deinit(bn_exp);
 	bignum_deinit(bn_modulus);
 	bignum_deinit(bn_result);
 	return ret;
 }

 #endif /* EAP_FAST */


 #endif /* CONFIG_TLS_INTERNAL */

 #endif /* EAP_TLS_FUNCS */
	/*
	* WPA Supplicant / Crypto wrapper for internal crypto implementation
	* Copyright (c) 2006, Jouni Malinen <[email protected]>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* Alternatively, this software may be distributed under the terms of BSD
	* license.
	*
	* See README and COPYING for more details.
	*/

	#include "includes.h"

	#include "common.h"
	#include "crypto.h"
	#include "md5.h"
	#include "sha1.h"
	#include "rc4.h"
	#include "aes.h"
	#include "rsa.h"
	#include "bignum.h"


	#ifdef EAP_TLS_FUNCS

	#ifdef CONFIG_TLS_INTERNAL

	/* from des.c */
	struct des3_key_s {
	u32 ek[3][32];
	u32 dk[3][32];
	};

	void des3_key_setup(const u8 key, struct des3_key_s dkey);
	void des3_encrypt(const u8 plain, const struct des3_key_s key, u8 *crypt);
	void des3_decrypt(const u8 crypt, const struct des3_key_s key, u8 *plain);


	struct MD5Context {
	u32 buf[4];
	u32 bits[2];
	u8 in[64];
	};

	struct SHA1Context {
	u32 state[5];
	u32 count[2];
	unsigned char buffer[64];
	};


	struct crypto_hash {
	enum crypto_hash_alg alg;
	union {
	struct MD5Context md5;
	struct SHA1Context sha1;
	} u;
	u8 key[64];
	size_t key_len;
	};


	struct crypto_hash * crypto_hash_init(enum crypto_hash_alg alg, const u8 *key,
	size_t key_len)
	{
	struct crypto_hash *ctx;
	u8 k_pad[64];
	u8 tk[20];
	size_t i;

	ctx = os_zalloc(sizeof(*ctx));
	if (ctx == NULL)
	return NULL;

	ctx->alg = alg;

	switch (alg) {
	case CRYPTO_HASH_ALG_MD5:
	MD5Init(&ctx->u.md5);
	break;
	case CRYPTO_HASH_ALG_SHA1:
	SHA1Init(&ctx->u.sha1);
	break;
	case CRYPTO_HASH_ALG_HMAC_MD5:
	if (key_len > sizeof(k_pad)) {
	MD5Init(&ctx->u.md5);
	MD5Update(&ctx->u.md5, key, key_len);
	MD5Final(tk, &ctx->u.md5);
	key = tk;
	key_len = 16;
	}
	os_memcpy(ctx->key, key, key_len);
	ctx->key_len = key_len;

	os_memcpy(k_pad, key, key_len);
	os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
	for (i = 0; i < sizeof(k_pad); i++)
	k_pad[i] ^= 0x36;
	MD5Init(&ctx->u.md5);
	MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
	break;
	case CRYPTO_HASH_ALG_HMAC_SHA1:
	if (key_len > sizeof(k_pad)) {
	SHA1Init(&ctx->u.sha1);
	SHA1Update(&ctx->u.sha1, key, key_len);
	SHA1Final(tk, &ctx->u.sha1);
	key = tk;
	key_len = 20;
	}
	os_memcpy(ctx->key, key, key_len);
	ctx->key_len = key_len;

	os_memcpy(k_pad, key, key_len);
	os_memset(k_pad + key_len, 0, sizeof(k_pad) - key_len);
	for (i = 0; i < sizeof(k_pad); i++)
	k_pad[i] ^= 0x36;
	SHA1Init(&ctx->u.sha1);
	SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
	break;
	default:
	os_free(ctx);
	return NULL;
	}

	return ctx;
	}


	void crypto_hash_update(struct crypto_hash ctx, const u8 data, size_t len)
	{
	if (ctx == NULL)
	return;

	switch (ctx->alg) {
	case CRYPTO_HASH_ALG_MD5:
	case CRYPTO_HASH_ALG_HMAC_MD5:
	MD5Update(&ctx->u.md5, data, len);
	break;
	case CRYPTO_HASH_ALG_SHA1:
	case CRYPTO_HASH_ALG_HMAC_SHA1:
	SHA1Update(&ctx->u.sha1, data, len);
	break;
	}
	}


	int crypto_hash_finish(struct crypto_hash ctx, u8 mac, size_t *len)
	{
	u8 k_pad[64];
	size_t i;

	if (ctx == NULL)
	return -2;

	if (mac == NULL \|\| len == NULL) {
	os_free(ctx);
	return 0;
	}

	switch (ctx->alg) {
	case CRYPTO_HASH_ALG_MD5:
	if (*len < 16) {
	*len = 16;
	os_free(ctx);
	return -1;
	}
	*len = 16;
	MD5Final(mac, &ctx->u.md5);
	break;
	case CRYPTO_HASH_ALG_SHA1:
	if (*len < 20) {
	*len = 20;
	os_free(ctx);
	return -1;
	}
	*len = 20;
	SHA1Final(mac, &ctx->u.sha1);
	break;
	case CRYPTO_HASH_ALG_HMAC_MD5:
	if (*len < 16) {
	*len = 16;
	os_free(ctx);
	return -1;
	}
	*len = 16;

	MD5Final(mac, &ctx->u.md5);

	os_memcpy(k_pad, ctx->key, ctx->key_len);
	os_memset(k_pad + ctx->key_len, 0,
	sizeof(k_pad) - ctx->key_len);
	for (i = 0; i < sizeof(k_pad); i++)
	k_pad[i] ^= 0x5c;
	MD5Init(&ctx->u.md5);
	MD5Update(&ctx->u.md5, k_pad, sizeof(k_pad));
	MD5Update(&ctx->u.md5, mac, 16);
	MD5Final(mac, &ctx->u.md5);
	break;
	case CRYPTO_HASH_ALG_HMAC_SHA1:
	if (*len < 20) {
	*len = 20;
	os_free(ctx);
	return -1;
	}
	*len = 20;

	SHA1Final(mac, &ctx->u.sha1);

	os_memcpy(k_pad, ctx->key, ctx->key_len);
	os_memset(k_pad + ctx->key_len, 0,
	sizeof(k_pad) - ctx->key_len);
	for (i = 0; i < sizeof(k_pad); i++)
	k_pad[i] ^= 0x5c;
	SHA1Init(&ctx->u.sha1);
	SHA1Update(&ctx->u.sha1, k_pad, sizeof(k_pad));
	SHA1Update(&ctx->u.sha1, mac, 20);
	SHA1Final(mac, &ctx->u.sha1);
	break;
	}

	os_free(ctx);

	return 0;
	}


	struct crypto_cipher {
	enum crypto_cipher_alg alg;
	union {
	struct {
	size_t used_bytes;
	u8 key[16];
	size_t keylen;
	} rc4;
	struct {
	u8 cbc[32];
	size_t block_size;
	void *ctx_enc;
	void *ctx_dec;
	} aes;
	struct {
	struct des3_key_s key;
	u8 cbc[8];
	} des3;
	} u;
	};


	struct crypto_cipher * crypto_cipher_init(enum crypto_cipher_alg alg,
	const u8 iv, const u8 key,
	size_t key_len)
	{
	struct crypto_cipher *ctx;

	ctx = os_zalloc(sizeof(*ctx));
	if (ctx == NULL)
	return NULL;

	ctx->alg = alg;

	switch (alg) {
	case CRYPTO_CIPHER_ALG_RC4:
	if (key_len > sizeof(ctx->u.rc4.key)) {
	os_free(ctx);
	return NULL;
	}
	ctx->u.rc4.keylen = key_len;
	os_memcpy(ctx->u.rc4.key, key, key_len);
	break;
	case CRYPTO_CIPHER_ALG_AES:
	if (key_len > sizeof(ctx->u.aes.cbc)) {
	os_free(ctx);
	return NULL;
	}
	ctx->u.aes.ctx_enc = aes_encrypt_init(key, key_len);
	if (ctx->u.aes.ctx_enc == NULL) {
	os_free(ctx);
	return NULL;
	}
	ctx->u.aes.ctx_dec = aes_decrypt_init(key, key_len);
	if (ctx->u.aes.ctx_dec == NULL) {
	aes_encrypt_deinit(ctx->u.aes.ctx_enc);
	os_free(ctx);
	return NULL;
	}
	ctx->u.aes.block_size = key_len;
	os_memcpy(ctx->u.aes.cbc, iv, ctx->u.aes.block_size);
	break;
	case CRYPTO_CIPHER_ALG_3DES:
	if (key_len != 24) {
	os_free(ctx);
	return NULL;
	}
	des3_key_setup(key, &ctx->u.des3.key);
	os_memcpy(ctx->u.des3.cbc, iv, 8);
	break;
	default:
	os_free(ctx);
	return NULL;
	}

	return ctx;
	}


	int crypto_cipher_encrypt(struct crypto_cipher ctx, const u8 plain,
	u8 *crypt, size_t len)
	{
	size_t i, j, blocks;

	switch (ctx->alg) {
	case CRYPTO_CIPHER_ALG_RC4:
	if (plain != crypt)
	os_memcpy(crypt, plain, len);
	rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
	ctx->u.rc4.used_bytes, crypt, len);
	ctx->u.rc4.used_bytes += len;
	break;
	case CRYPTO_CIPHER_ALG_AES:
	if (len % ctx->u.aes.block_size)
	return -1;
	blocks = len / ctx->u.aes.block_size;
	for (i = 0; i < blocks; i++) {
	for (j = 0; j < ctx->u.aes.block_size; j++)
	ctx->u.aes.cbc[j] ^= plain[j];
	aes_encrypt(ctx->u.aes.ctx_enc, ctx->u.aes.cbc,
	ctx->u.aes.cbc);
	os_memcpy(crypt, ctx->u.aes.cbc,
	ctx->u.aes.block_size);
	plain += ctx->u.aes.block_size;
	crypt += ctx->u.aes.block_size;
	}
	break;
	case CRYPTO_CIPHER_ALG_3DES:
	if (len % 8)
	return -1;
	blocks = len / 8;
	for (i = 0; i < blocks; i++) {
	for (j = 0; j < 8; j++)
	ctx->u.des3.cbc[j] ^= plain[j];
	des3_encrypt(ctx->u.des3.cbc, &ctx->u.des3.key,
	ctx->u.des3.cbc);
	os_memcpy(crypt, ctx->u.des3.cbc, 8);
	plain += 8;
	crypt += 8;
	}
	break;
	default:
	return -1;
	}

	return 0;
	}


	int crypto_cipher_decrypt(struct crypto_cipher ctx, const u8 crypt,
	u8 *plain, size_t len)
	{
	size_t i, j, blocks;
	u8 tmp[32];

	switch (ctx->alg) {
	case CRYPTO_CIPHER_ALG_RC4:
	if (plain != crypt)
	os_memcpy(plain, crypt, len);
	rc4_skip(ctx->u.rc4.key, ctx->u.rc4.keylen,
	ctx->u.rc4.used_bytes, plain, len);
	ctx->u.rc4.used_bytes += len;
	break;
	case CRYPTO_CIPHER_ALG_AES:
	if (len % ctx->u.aes.block_size)
	return -1;
	blocks = len / ctx->u.aes.block_size;
	for (i = 0; i < blocks; i++) {
	os_memcpy(tmp, crypt, ctx->u.aes.block_size);
	aes_decrypt(ctx->u.aes.ctx_dec, crypt, plain);
	for (j = 0; j < ctx->u.aes.block_size; j++)
	plain[j] ^= ctx->u.aes.cbc[j];
	os_memcpy(ctx->u.aes.cbc, tmp, ctx->u.aes.block_size);
	plain += ctx->u.aes.block_size;
	crypt += ctx->u.aes.block_size;
	}
	break;
	case CRYPTO_CIPHER_ALG_3DES:
	if (len % 8)
	return -1;
	blocks = len / 8;
	for (i = 0; i < blocks; i++) {
	os_memcpy(tmp, crypt, 8);
	des3_decrypt(crypt, &ctx->u.des3.key, plain);
	for (j = 0; j < 8; j++)
	plain[j] ^= ctx->u.des3.cbc[j];
	os_memcpy(ctx->u.des3.cbc, tmp, 8);
	plain += 8;
	crypt += 8;
	}
	break;
	default:
	return -1;
	}

	return 0;
	}


	void crypto_cipher_deinit(struct crypto_cipher *ctx)
	{
	switch (ctx->alg) {
	case CRYPTO_CIPHER_ALG_AES:
	aes_encrypt_deinit(ctx->u.aes.ctx_enc);
	aes_decrypt_deinit(ctx->u.aes.ctx_dec);
	break;
	case CRYPTO_CIPHER_ALG_3DES:
	break;
	default:
	break;
	}
	os_free(ctx);
	}


	/* Dummy structures; these are just typecast to struct crypto_rsa_key */
	struct crypto_public_key;
	struct crypto_private_key;


	struct crypto_public_key * crypto_public_key_import(const u8 *key, size_t len)
	{
	return (struct crypto_public_key *)
	crypto_rsa_import_public_key(key, len);
	}


	struct crypto_private_key * crypto_private_key_import(const u8 *key,
	size_t len)
	{
	return (struct crypto_private_key *)
	crypto_rsa_import_private_key(key, len);
	}


	struct crypto_public_key * crypto_public_key_from_cert(const u8 *buf,
	size_t len)
	{
	/* No X.509 support in crypto_internal.c */
	return NULL;
	}


	static int pkcs1_generate_encryption_block(u8 block_type, size_t modlen,
	const u8 *in, size_t inlen,
	u8 out, size_t outlen)
	{
	size_t ps_len;
	u8 *pos;

	/*
	* PKCS #1 v1.5, 8.1:
	*
	* EB = 00 \|\| BT \|\| PS \|\| 00 \|\| D
	* BT = 00 or 01 for private-key operation; 02 for public-key operation
	* PS = k-3-\|\|D\|\|; at least eight octets
	* (BT=0: PS=0x00, BT=1: PS=0xff, BT=2: PS=pseudorandom non-zero)
	* k = length of modulus in octets (modlen)
	*/

	if (modlen < 12 \|\| modlen > *outlen \|\| inlen > modlen - 11) {
	wpa_printf(MSG_DEBUG, "PKCS #1: %s - Invalid buffer "
	"lengths (modlen=%lu outlen=%lu inlen=%lu)",
	__func__, (unsigned long) modlen,
	(unsigned long) *outlen,
	(unsigned long) inlen);
	return -1;
	}

	pos = out;
	*pos++ = 0x00;
	pos++ = block_type; / BT */
	ps_len = modlen - inlen - 3;
	switch (block_type) {
	case 0:
	os_memset(pos, 0x00, ps_len);
	pos += ps_len;
	break;
	case 1:
	os_memset(pos, 0xff, ps_len);
	pos += ps_len;
	break;
	case 2:
	if (os_get_random(pos, ps_len) < 0) {
	wpa_printf(MSG_DEBUG, "PKCS #1: %s - Failed to get "
	"random data for PS", __func__);
	return -1;
	}
	while (ps_len--) {
	if (*pos == 0x00)
	*pos = 0x01;
	pos++;
	}
	break;
	default:
	wpa_printf(MSG_DEBUG, "PKCS #1: %s - Unsupported block type "
	"%d", __func__, block_type);
	return -1;
	}
	*pos++ = 0x00;
	os_memcpy(pos, in, inlen); /* D */

	return 0;
	}


	static int crypto_rsa_encrypt_pkcs1(int block_type, struct crypto_rsa_key *key,
	int use_private,
	const u8 *in, size_t inlen,
	u8 out, size_t outlen)
	{
	size_t modlen;

	modlen = crypto_rsa_get_modulus_len(key);

	if (pkcs1_generate_encryption_block(block_type, modlen, in, inlen,
	out, outlen) < 0)
	return -1;

	return crypto_rsa_exptmod(out, modlen, out, outlen, key, use_private);
	}


	int crypto_public_key_encrypt_pkcs1_v15(struct crypto_public_key *key,
	const u8 *in, size_t inlen,
	u8 out, size_t outlen)
	{
	return crypto_rsa_encrypt_pkcs1(2, (struct crypto_rsa_key *) key,
	0, in, inlen, out, outlen);
	}


	int crypto_private_key_sign_pkcs1(struct crypto_private_key *key,
	const u8 *in, size_t inlen,
	u8 out, size_t outlen)
	{
	return crypto_rsa_encrypt_pkcs1(1, (struct crypto_rsa_key *) key,
	1, in, inlen, out, outlen);
	}


	void crypto_public_key_free(struct crypto_public_key *key)
	{
	crypto_rsa_free((struct crypto_rsa_key *) key);
	}


	void crypto_private_key_free(struct crypto_private_key *key)
	{
	crypto_rsa_free((struct crypto_rsa_key *) key);
	}


	int crypto_public_key_decrypt_pkcs1(struct crypto_public_key *key,
	const u8 *crypt, size_t crypt_len,
	u8 plain, size_t plain_len)
	{
	size_t len;
	u8 *pos;

	len = *plain_len;
	if (crypto_rsa_exptmod(crypt, crypt_len, plain, &len,
	(struct crypto_rsa_key *) key, 0) < 0)
	return -1;

	/*
	* PKCS #1 v1.5, 8.1:
	*
	* EB = 00 \|\| BT \|\| PS \|\| 00 \|\| D
	* BT = 01
	* PS = k-3-\|\|D\|\| times FF
	* k = length of modulus in octets
	*/

	if (len < 3 + 8 + 16 /* min hash len */ \|\|
	plain[0] != 0x00 \|\| plain[1] != 0x01 \|\| plain[2] != 0xff) {
	wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
	"structure");
	return -1;
	}

	pos = plain + 3;
	while (pos < plain + len && *pos == 0xff)
	pos++;
	if (pos - plain - 2 < 8) {
	/* PKCS #1 v1.5, 8.1: At least eight octets long PS */
	wpa_printf(MSG_INFO, "LibTomCrypt: Too short signature "
	"padding");
	return -1;
	}

	if (pos + 16 /* min hash len / >= plain + len \|\| pos != 0x00) {
	wpa_printf(MSG_INFO, "LibTomCrypt: Invalid signature EB "
	"structure (2)");
	return -1;
	}
	pos++;
	len -= pos - plain;

	/* Strip PKCS #1 header */
	os_memmove(plain, pos, len);
	*plain_len = len;

	return 0;
	}


	int crypto_global_init(void)
	{
	return 0;
	}


	void crypto_global_deinit(void)
	{
	}


	#ifdef EAP_FAST

	int crypto_mod_exp(const u8 *base, size_t base_len,
	const u8 *power, size_t power_len,
	const u8 *modulus, size_t modulus_len,
	u8 result, size_t result_len)
	{
	struct bignum bn_base, bn_exp, bn_modulus, bn_result;
	int ret = 0;

	bn_base = bignum_init();
	bn_exp = bignum_init();
	bn_modulus = bignum_init();
	bn_result = bignum_init();

	if (bn_base == NULL \|\| bn_exp == NULL \|\| bn_modulus == NULL \|\|
	bn_result == NULL)
	goto error;

	if (bignum_set_unsigned_bin(bn_base, base, base_len) < 0 \|\|
	bignum_set_unsigned_bin(bn_exp, power, power_len) < 0 \|\|
	bignum_set_unsigned_bin(bn_modulus, modulus, modulus_len) < 0)
	goto error;

	if (bignum_exptmod(bn_base, bn_exp, bn_modulus, bn_result) < 0)
	goto error;

	ret = bignum_get_unsigned_bin(bn_result, result, result_len);

	error:
	bignum_deinit(bn_base);
	bignum_deinit(bn_exp);
	bignum_deinit(bn_modulus);
	bignum_deinit(bn_result);
	return ret;
	}

	#endif /* EAP_FAST */


	#endif /* CONFIG_TLS_INTERNAL */

	#endif /* EAP_TLS_FUNCS */