crypto/evp/e_rc4_hmac_md5.c - third_party/openssl - Git at Google

 /*
  * Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
  *
  * Licensed under the OpenSSL license (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
  */

 #include <openssl/opensslconf.h>

 #include <stdio.h>
 #include <string.h>

 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)

 # include <openssl/crypto.h>
 # include <openssl/evp.h>
 # include <openssl/objects.h>
 # include <openssl/rc4.h>
 # include <openssl/md5.h>
 # include "internal/evp_int.h"

 # ifndef EVP_CIPH_FLAG_AEAD_CIPHER
 #  define EVP_CIPH_FLAG_AEAD_CIPHER       0x200000
 #  define EVP_CTRL_AEAD_TLS1_AAD          0x16
 #  define EVP_CTRL_AEAD_SET_MAC_KEY       0x17
 # endif

 /* FIXME: surely this is available elsewhere? */
 # define EVP_RC4_KEY_SIZE                16

 typedef struct {
     RC4_KEY ks;
     MD5_CTX head, tail, md;
     size_t payload_length;
 } EVP_RC4_HMAC_MD5;

 # define NO_PAYLOAD_LENGTH       ((size_t)-1)

 void rc4_md5_enc(RC4_KEY *key, const void *in0, void *out,
                  MD5_CTX *ctx, const void *inp, size_t blocks);

 # define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))

 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
                                  const unsigned char *inkey,
                                  const unsigned char *iv, int enc)
 {
     EVP_RC4_HMAC_MD5 *key = data(ctx);

     RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);

     MD5_Init(&key->head);       /* handy when benchmarking */
     key->tail = key->head;
     key->md = key->head;

     key->payload_length = NO_PAYLOAD_LENGTH;

     return 1;
 }

 # if     defined(RC4_ASM) && defined(MD5_ASM) &&     (	   \
         defined(__x86_64)       || defined(__x86_64__)  || \
         defined(_M_AMD64)       || defined(_M_X64)      )
 #  define STITCHED_CALL
 # endif

 # if !defined(STITCHED_CALL)
 #  define rc4_off 0
 #  define md5_off 0
 # endif

 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
                                const unsigned char *in, size_t len)
 {
     EVP_RC4_HMAC_MD5 *key = data(ctx);
 # if defined(STITCHED_CALL)
     size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
                                                        * rc4_md5-x86_64.pl */
         md5_off = MD5_CBLOCK - key->md.num, blocks;
     unsigned int l;
     extern unsigned int OPENSSL_ia32cap_P[];
 # endif
     size_t plen = key->payload_length;

     if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
         return 0;

     if (EVP_CIPHER_CTX_encrypting(ctx)) {
         if (plen == NO_PAYLOAD_LENGTH)
             plen = len;
 # if defined(STITCHED_CALL)
         /* cipher has to "fall behind" */
         if (rc4_off > md5_off)
             md5_off += MD5_CBLOCK;

         if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
             (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
             MD5_Update(&key->md, in, md5_off);
             RC4(&key->ks, rc4_off, in, out);

             rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
                         &key->md, in + md5_off, blocks);
             blocks *= MD5_CBLOCK;
             rc4_off += blocks;
             md5_off += blocks;
             key->md.Nh += blocks >> 29;
             key->md.Nl += blocks <<= 3;
             if (key->md.Nl < (unsigned int)blocks)
                 key->md.Nh++;
         } else {
             rc4_off = 0;
             md5_off = 0;
         }
 # endif
         MD5_Update(&key->md, in + md5_off, plen - md5_off);

         if (plen != len) {      /* "TLS" mode of operation */
             if (in != out)
                 memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);

             /* calculate HMAC and append it to payload */
             MD5_Final(out + plen, &key->md);
             key->md = key->tail;
             MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
             MD5_Final(out + plen, &key->md);
             /* encrypt HMAC at once */
             RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
         } else {
             RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
         }
     } else {
         unsigned char mac[MD5_DIGEST_LENGTH];
 # if defined(STITCHED_CALL)
         /* digest has to "fall behind" */
         if (md5_off > rc4_off)
             rc4_off += 2 * MD5_CBLOCK;
         else
             rc4_off += MD5_CBLOCK;

         if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
             (OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
             RC4(&key->ks, rc4_off, in, out);
             MD5_Update(&key->md, out, md5_off);

             rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
                         &key->md, out + md5_off, blocks);
             blocks *= MD5_CBLOCK;
             rc4_off += blocks;
             md5_off += blocks;
             l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
             if (l < key->md.Nl)
                 key->md.Nh++;
             key->md.Nl = l;
             key->md.Nh += blocks >> 29;
         } else {
             md5_off = 0;
             rc4_off = 0;
         }
 # endif
         /* decrypt HMAC at once */
         RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
         if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
             MD5_Update(&key->md, out + md5_off, plen - md5_off);

             /* calculate HMAC and verify it */
             MD5_Final(mac, &key->md);
             key->md = key->tail;
             MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
             MD5_Final(mac, &key->md);

             if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
                 return 0;
         } else {
             MD5_Update(&key->md, out + md5_off, len - md5_off);
         }
     }

     key->payload_length = NO_PAYLOAD_LENGTH;

     return 1;
 }

 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
                              void *ptr)
 {
     EVP_RC4_HMAC_MD5 *key = data(ctx);

     switch (type) {
     case EVP_CTRL_AEAD_SET_MAC_KEY:
         {
             unsigned int i;
             unsigned char hmac_key[64];

             memset(hmac_key, 0, sizeof(hmac_key));

             if (arg > (int)sizeof(hmac_key)) {
                 MD5_Init(&key->head);
                 MD5_Update(&key->head, ptr, arg);
                 MD5_Final(hmac_key, &key->head);
             } else {
                 memcpy(hmac_key, ptr, arg);
             }

             for (i = 0; i < sizeof(hmac_key); i++)
                 hmac_key[i] ^= 0x36; /* ipad */
             MD5_Init(&key->head);
             MD5_Update(&key->head, hmac_key, sizeof(hmac_key));

             for (i = 0; i < sizeof(hmac_key); i++)
                 hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
             MD5_Init(&key->tail);
             MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));

             OPENSSL_cleanse(hmac_key, sizeof(hmac_key));

             return 1;
         }
     case EVP_CTRL_AEAD_TLS1_AAD:
         {
             unsigned char *p = ptr;
             unsigned int len;

             if (arg != EVP_AEAD_TLS1_AAD_LEN)
                 return -1;

             len = p[arg - 2] << 8 | p[arg - 1];

             if (!EVP_CIPHER_CTX_encrypting(ctx)) {
                 len -= MD5_DIGEST_LENGTH;
                 p[arg - 2] = len >> 8;
                 p[arg - 1] = len;
             }
             key->payload_length = len;
             key->md = key->head;
             MD5_Update(&key->md, p, arg);

             return MD5_DIGEST_LENGTH;
         }
     default:
         return -1;
     }
 }

 static EVP_CIPHER r4_hmac_md5_cipher = {
 # ifdef NID_rc4_hmac_md5
     NID_rc4_hmac_md5,
 # else
     NID_undef,
 # endif
     1, EVP_RC4_KEY_SIZE, 0,
     EVP_CIPH_STREAM_CIPHER | EVP_CIPH_VARIABLE_LENGTH |
         EVP_CIPH_FLAG_AEAD_CIPHER,
     rc4_hmac_md5_init_key,
     rc4_hmac_md5_cipher,
     NULL,
     sizeof(EVP_RC4_HMAC_MD5),
     NULL,
     NULL,
     rc4_hmac_md5_ctrl,
     NULL
 };

 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
 {
     return (&r4_hmac_md5_cipher);
 }
 #endif
	/*
	* Copyright 2011-2016 The OpenSSL Project Authors. All Rights Reserved.
	*
	* Licensed under the OpenSSL license (the "License"). You may not use
	* this file except in compliance with the License. You can obtain a copy
	* in the file LICENSE in the source distribution or at
	* https://www.openssl.org/source/license.html
	*/

	#include <openssl/opensslconf.h>

	#include <stdio.h>
	#include <string.h>

	#if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)

	# include <openssl/crypto.h>
	# include <openssl/evp.h>
	# include <openssl/objects.h>
	# include <openssl/rc4.h>
	# include <openssl/md5.h>
	# include "internal/evp_int.h"

	# ifndef EVP_CIPH_FLAG_AEAD_CIPHER
	# define EVP_CIPH_FLAG_AEAD_CIPHER 0x200000
	# define EVP_CTRL_AEAD_TLS1_AAD 0x16
	# define EVP_CTRL_AEAD_SET_MAC_KEY 0x17
	# endif

	/* FIXME: surely this is available elsewhere? */
	# define EVP_RC4_KEY_SIZE 16

	typedef struct {
	RC4_KEY ks;
	MD5_CTX head, tail, md;
	size_t payload_length;
	} EVP_RC4_HMAC_MD5;

	# define NO_PAYLOAD_LENGTH ((size_t)-1)

	void rc4_md5_enc(RC4_KEY key, const void in0, void *out,
	MD5_CTX ctx, const void inp, size_t blocks);

	# define data(ctx) ((EVP_RC4_HMAC_MD5 *)EVP_CIPHER_CTX_get_cipher_data(ctx))

	static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
	const unsigned char *inkey,
	const unsigned char *iv, int enc)
	{
	EVP_RC4_HMAC_MD5 *key = data(ctx);

	RC4_set_key(&key->ks, EVP_CIPHER_CTX_key_length(ctx), inkey);

	MD5_Init(&key->head); /* handy when benchmarking */
	key->tail = key->head;
	key->md = key->head;

	key->payload_length = NO_PAYLOAD_LENGTH;

	return 1;
	}

	# if defined(RC4_ASM) && defined(MD5_ASM) && ( \
	defined(__x86_64) \|\| defined(__x86_64__) \|\| \
	defined(_M_AMD64) \|\| defined(_M_X64) )
	# define STITCHED_CALL
	# endif

	# if !defined(STITCHED_CALL)
	# define rc4_off 0
	# define md5_off 0
	# endif

	static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX ctx, unsigned char out,
	const unsigned char *in, size_t len)
	{
	EVP_RC4_HMAC_MD5 *key = data(ctx);
	# if defined(STITCHED_CALL)
	size_t rc4_off = 32 - 1 - (key->ks.x & (32 - 1)), /* 32 is $MOD from
	* rc4_md5-x86_64.pl */
	md5_off = MD5_CBLOCK - key->md.num, blocks;
	unsigned int l;
	extern unsigned int OPENSSL_ia32cap_P[];
	# endif
	size_t plen = key->payload_length;

	if (plen != NO_PAYLOAD_LENGTH && len != (plen + MD5_DIGEST_LENGTH))
	return 0;

	if (EVP_CIPHER_CTX_encrypting(ctx)) {
	if (plen == NO_PAYLOAD_LENGTH)
	plen = len;
	# if defined(STITCHED_CALL)
	/* cipher has to "fall behind" */
	if (rc4_off > md5_off)
	md5_off += MD5_CBLOCK;

	if (plen > md5_off && (blocks = (plen - md5_off) / MD5_CBLOCK) &&
	(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
	MD5_Update(&key->md, in, md5_off);
	RC4(&key->ks, rc4_off, in, out);

	rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
	&key->md, in + md5_off, blocks);
	blocks *= MD5_CBLOCK;
	rc4_off += blocks;
	md5_off += blocks;
	key->md.Nh += blocks >> 29;
	key->md.Nl += blocks <<= 3;
	if (key->md.Nl < (unsigned int)blocks)
	key->md.Nh++;
	} else {
	rc4_off = 0;
	md5_off = 0;
	}
	# endif
	MD5_Update(&key->md, in + md5_off, plen - md5_off);

	if (plen != len) { /* "TLS" mode of operation */
	if (in != out)
	memcpy(out + rc4_off, in + rc4_off, plen - rc4_off);

	/* calculate HMAC and append it to payload */
	MD5_Final(out + plen, &key->md);
	key->md = key->tail;
	MD5_Update(&key->md, out + plen, MD5_DIGEST_LENGTH);
	MD5_Final(out + plen, &key->md);
	/* encrypt HMAC at once */
	RC4(&key->ks, len - rc4_off, out + rc4_off, out + rc4_off);
	} else {
	RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
	}
	} else {
	unsigned char mac[MD5_DIGEST_LENGTH];
	# if defined(STITCHED_CALL)
	/* digest has to "fall behind" */
	if (md5_off > rc4_off)
	rc4_off += 2 * MD5_CBLOCK;
	else
	rc4_off += MD5_CBLOCK;

	if (len > rc4_off && (blocks = (len - rc4_off) / MD5_CBLOCK) &&
	(OPENSSL_ia32cap_P[0] & (1 << 20)) == 0) {
	RC4(&key->ks, rc4_off, in, out);
	MD5_Update(&key->md, out, md5_off);

	rc4_md5_enc(&key->ks, in + rc4_off, out + rc4_off,
	&key->md, out + md5_off, blocks);
	blocks *= MD5_CBLOCK;
	rc4_off += blocks;
	md5_off += blocks;
	l = (key->md.Nl + (blocks << 3)) & 0xffffffffU;
	if (l < key->md.Nl)
	key->md.Nh++;
	key->md.Nl = l;
	key->md.Nh += blocks >> 29;
	} else {
	md5_off = 0;
	rc4_off = 0;
	}
	# endif
	/* decrypt HMAC at once */
	RC4(&key->ks, len - rc4_off, in + rc4_off, out + rc4_off);
	if (plen != NO_PAYLOAD_LENGTH) { /* "TLS" mode of operation */
	MD5_Update(&key->md, out + md5_off, plen - md5_off);

	/* calculate HMAC and verify it */
	MD5_Final(mac, &key->md);
	key->md = key->tail;
	MD5_Update(&key->md, mac, MD5_DIGEST_LENGTH);
	MD5_Final(mac, &key->md);

	if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
	return 0;
	} else {
	MD5_Update(&key->md, out + md5_off, len - md5_off);
	}
	}

	key->payload_length = NO_PAYLOAD_LENGTH;

	return 1;
	}

	static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg,
	void *ptr)
	{
	EVP_RC4_HMAC_MD5 *key = data(ctx);

	switch (type) {
	case EVP_CTRL_AEAD_SET_MAC_KEY:
	{
	unsigned int i;
	unsigned char hmac_key[64];

	memset(hmac_key, 0, sizeof(hmac_key));

	if (arg > (int)sizeof(hmac_key)) {
	MD5_Init(&key->head);
	MD5_Update(&key->head, ptr, arg);
	MD5_Final(hmac_key, &key->head);
	} else {
	memcpy(hmac_key, ptr, arg);
	}

	for (i = 0; i < sizeof(hmac_key); i++)
	hmac_key[i] ^= 0x36; /* ipad */
	MD5_Init(&key->head);
	MD5_Update(&key->head, hmac_key, sizeof(hmac_key));

	for (i = 0; i < sizeof(hmac_key); i++)
	hmac_key[i] ^= 0x36 ^ 0x5c; /* opad */
	MD5_Init(&key->tail);
	MD5_Update(&key->tail, hmac_key, sizeof(hmac_key));

	OPENSSL_cleanse(hmac_key, sizeof(hmac_key));

	return 1;
	}
	case EVP_CTRL_AEAD_TLS1_AAD:
	{
	unsigned char *p = ptr;
	unsigned int len;

	if (arg != EVP_AEAD_TLS1_AAD_LEN)
	return -1;

	len = p[arg - 2] << 8 \| p[arg - 1];

	if (!EVP_CIPHER_CTX_encrypting(ctx)) {
	len -= MD5_DIGEST_LENGTH;
	p[arg - 2] = len >> 8;
	p[arg - 1] = len;
	}
	key->payload_length = len;
	key->md = key->head;
	MD5_Update(&key->md, p, arg);

	return MD5_DIGEST_LENGTH;
	}
	default:
	return -1;
	}
	}

	static EVP_CIPHER r4_hmac_md5_cipher = {
	# ifdef NID_rc4_hmac_md5
	NID_rc4_hmac_md5,
	# else
	NID_undef,
	# endif
	1, EVP_RC4_KEY_SIZE, 0,
	EVP_CIPH_STREAM_CIPHER \| EVP_CIPH_VARIABLE_LENGTH \|
	EVP_CIPH_FLAG_AEAD_CIPHER,
	rc4_hmac_md5_init_key,
	rc4_hmac_md5_cipher,
	NULL,
	sizeof(EVP_RC4_HMAC_MD5),
	NULL,
	NULL,
	rc4_hmac_md5_ctrl,
	NULL
	};

	const EVP_CIPHER *EVP_rc4_hmac_md5(void)
	{
	return (&r4_hmac_md5_cipher);
	}
	#endif