/* * 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 #include #include #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5) # include # include # include # include # include # 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(OPENSSL_NO_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)); 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