- {
- if (s->s3->tmp.key_block != NULL)
- {
- memset(s->s3->tmp.key_block,0,
- s->s3->tmp.key_block_length);
- OPENSSL_free(s->s3->tmp.key_block);
- s->s3->tmp.key_block=NULL;
- }
- s->s3->tmp.key_block_length=0;
- }
-
-int ssl3_enc(SSL *s, int send)
- {
- SSL3_RECORD *rec;
- EVP_CIPHER_CTX *ds;
- unsigned long l;
- int bs,i;
- const EVP_CIPHER *enc;
-
- if (send)
- {
- ds=s->enc_write_ctx;
- rec= &(s->s3->wrec);
- if (s->enc_write_ctx == NULL)
- enc=NULL;
- else
- enc=EVP_CIPHER_CTX_cipher(s->enc_write_ctx);
- }
- else
- {
- ds=s->enc_read_ctx;
- rec= &(s->s3->rrec);
- if (s->enc_read_ctx == NULL)
- enc=NULL;
- else
- enc=EVP_CIPHER_CTX_cipher(s->enc_read_ctx);
- }
-
- if ((s->session == NULL) || (ds == NULL) ||
- (enc == NULL))
- {
- memmove(rec->data,rec->input,rec->length);
- rec->input=rec->data;
- }
- else
- {
- l=rec->length;
- bs=EVP_CIPHER_block_size(ds->cipher);
-
- /* COMPRESS */
-
- if ((bs != 1) && send)
- {
- i=bs-((int)l%bs);
-
- /* we need to add 'i-1' padding bytes */
- l+=i;
- rec->length+=i;
- rec->input[l-1]=(i-1);
- }
-
- if (!send)
- {
- if (l == 0 || l%bs != 0)
- {
- SSLerr(SSL_F_SSL3_ENC,SSL_R_BLOCK_CIPHER_PAD_IS_WRONG);
- ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECRYPTION_FAILED);
- return 0;
- }
- }
-
- EVP_Cipher(ds,rec->data,rec->input,l);
-
- if ((bs != 1) && !send)
- {
- i=rec->data[l-1]+1;
- /* SSL 3.0 bounds the number of padding bytes by the block size;
- * padding bytes (except that last) are arbitrary */
- if (i > bs)
- {
- /* Incorrect padding. SSLerr() and ssl3_alert are done
- * by caller: we don't want to reveal whether this is
- * a decryption error or a MAC verification failure
- * (see http://www.openssl.org/~bodo/tls-cbc.txt) */
- return -1;
- }
- rec->length-=i;
- }
- }
- return(1);
- }
-
-void ssl3_init_finished_mac(SSL *s)
- {
- EVP_DigestInit_ex(&(s->s3->finish_dgst1),s->ctx->md5, NULL);
- EVP_DigestInit_ex(&(s->s3->finish_dgst2),s->ctx->sha1, NULL);
- }
-
-void ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
- {
- EVP_DigestUpdate(&(s->s3->finish_dgst1),buf,len);
- EVP_DigestUpdate(&(s->s3->finish_dgst2),buf,len);
- }
-
-int ssl3_cert_verify_mac(SSL *s, EVP_MD_CTX *ctx, unsigned char *p)
- {
- return(ssl3_handshake_mac(s,ctx,NULL,0,p));
- }
-
-int ssl3_final_finish_mac(SSL *s, EVP_MD_CTX *ctx1, EVP_MD_CTX *ctx2,
- const char *sender, int len, unsigned char *p)
- {
- int ret;
-
- ret=ssl3_handshake_mac(s,ctx1,sender,len,p);
- p+=ret;
- ret+=ssl3_handshake_mac(s,ctx2,sender,len,p);
- return(ret);
- }
-
-static int ssl3_handshake_mac(SSL *s, EVP_MD_CTX *in_ctx,
- const char *sender, int len, unsigned char *p)
- {
- unsigned int ret;
- int npad,n;
- unsigned int i;
- unsigned char md_buf[EVP_MAX_MD_SIZE];
- EVP_MD_CTX ctx;
-
- EVP_MD_CTX_init(&ctx);
- EVP_MD_CTX_copy_ex(&ctx,in_ctx);
-
- n=EVP_MD_CTX_size(&ctx);
- npad=(48/n)*n;
-
- if (sender != NULL)
- EVP_DigestUpdate(&ctx,sender,len);
- EVP_DigestUpdate(&ctx,s->session->master_key,
- s->session->master_key_length);
- EVP_DigestUpdate(&ctx,ssl3_pad_1,npad);
- EVP_DigestFinal_ex(&ctx,md_buf,&i);
-
- EVP_DigestInit_ex(&ctx,EVP_MD_CTX_md(&ctx), NULL);
- EVP_DigestUpdate(&ctx,s->session->master_key,
- s->session->master_key_length);
- EVP_DigestUpdate(&ctx,ssl3_pad_2,npad);
- EVP_DigestUpdate(&ctx,md_buf,i);
- EVP_DigestFinal_ex(&ctx,p,&ret);
-
- EVP_MD_CTX_cleanup(&ctx);
-
- return((int)ret);
- }
-
-int ssl3_mac(SSL *ssl, unsigned char *md, int send)
- {
- SSL3_RECORD *rec;
- unsigned char *mac_sec,*seq;
- EVP_MD_CTX md_ctx;
- const EVP_MD *hash;
- unsigned char *p,rec_char;
- unsigned int md_size;
- int npad,i;
-
- if (send)
- {
- rec= &(ssl->s3->wrec);
- mac_sec= &(ssl->s3->write_mac_secret[0]);
- seq= &(ssl->s3->write_sequence[0]);
- hash=ssl->write_hash;
- }
- else
- {
- rec= &(ssl->s3->rrec);
- mac_sec= &(ssl->s3->read_mac_secret[0]);
- seq= &(ssl->s3->read_sequence[0]);
- hash=ssl->read_hash;
- }
-
- md_size=EVP_MD_size(hash);
- npad=(48/md_size)*md_size;
-
- /* Chop the digest off the end :-) */
- EVP_MD_CTX_init(&md_ctx);
-
- EVP_DigestInit_ex( &md_ctx,hash, NULL);
- EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
- EVP_DigestUpdate(&md_ctx,ssl3_pad_1,npad);
- EVP_DigestUpdate(&md_ctx,seq,8);
- rec_char=rec->type;
- EVP_DigestUpdate(&md_ctx,&rec_char,1);
- p=md;
- s2n(rec->length,p);
- EVP_DigestUpdate(&md_ctx,md,2);
- EVP_DigestUpdate(&md_ctx,rec->input,rec->length);
- EVP_DigestFinal_ex( &md_ctx,md,NULL);
-
- EVP_DigestInit_ex( &md_ctx,hash, NULL);
- EVP_DigestUpdate(&md_ctx,mac_sec,md_size);
- EVP_DigestUpdate(&md_ctx,ssl3_pad_2,npad);
- EVP_DigestUpdate(&md_ctx,md,md_size);
- EVP_DigestFinal_ex( &md_ctx,md,&md_size);
-
- EVP_MD_CTX_cleanup(&md_ctx);
-
- for (i=7; i>=0; i--)
- {
- ++seq[i];
- if (seq[i] != 0) break;
- }
-
- return(md_size);
- }
+{
+ OPENSSL_clear_free(s->s3->tmp.key_block, s->s3->tmp.key_block_length);
+ s->s3->tmp.key_block = NULL;
+ s->s3->tmp.key_block_length = 0;
+}
+
+int ssl3_init_finished_mac(SSL *s)
+{
+ BIO *buf = BIO_new(BIO_s_mem());
+
+ if (buf == NULL) {
+ SSLerr(SSL_F_SSL3_INIT_FINISHED_MAC, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ ssl3_free_digest_list(s);
+ s->s3->handshake_buffer = buf;
+ (void)BIO_set_close(s->s3->handshake_buffer, BIO_CLOSE);
+ return 1;
+}
+
+/*
+ * Free digest list. Also frees handshake buffer since they are always freed
+ * together.
+ */
+
+void ssl3_free_digest_list(SSL *s)
+{
+ BIO_free(s->s3->handshake_buffer);
+ s->s3->handshake_buffer = NULL;
+ EVP_MD_CTX_free(s->s3->handshake_dgst);
+ s->s3->handshake_dgst = NULL;
+}
+
+int ssl3_finish_mac(SSL *s, const unsigned char *buf, int len)
+{
+ if (s->s3->handshake_dgst == NULL)
+ /* Note: this writes to a memory BIO so a failure is a fatal error */
+ return BIO_write(s->s3->handshake_buffer, (void *)buf, len) == len;
+ else
+ return EVP_DigestUpdate(s->s3->handshake_dgst, buf, len);
+}
+
+int ssl3_digest_cached_records(SSL *s, int keep)
+{
+ const EVP_MD *md;
+ long hdatalen;
+ void *hdata;
+
+ if (s->s3->handshake_dgst == NULL) {
+ hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
+ if (hdatalen <= 0) {
+ SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS,
+ SSL_R_BAD_HANDSHAKE_LENGTH);
+ return 0;
+ }
+
+ s->s3->handshake_dgst = EVP_MD_CTX_new();
+ if (s->s3->handshake_dgst == NULL) {
+ SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+
+ md = ssl_handshake_md(s);
+ if (md == NULL || !EVP_DigestInit_ex(s->s3->handshake_dgst, md, NULL)
+ || !EVP_DigestUpdate(s->s3->handshake_dgst, hdata, hdatalen)) {
+ SSLerr(SSL_F_SSL3_DIGEST_CACHED_RECORDS, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+ }
+ if (keep == 0) {
+ BIO_free(s->s3->handshake_buffer);
+ s->s3->handshake_buffer = NULL;
+ }
+
+ return 1;
+}
+
+int ssl3_final_finish_mac(SSL *s, const char *sender, int len, unsigned char *p)
+{
+ int ret;
+ EVP_MD_CTX *ctx = NULL;
+
+ if (!ssl3_digest_cached_records(s, 0))
+ return 0;
+
+ if (EVP_MD_CTX_type(s->s3->handshake_dgst) != NID_md5_sha1) {
+ SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, SSL_R_NO_REQUIRED_DIGEST);
+ return 0;
+ }
+
+ ctx = EVP_MD_CTX_new();
+ if (ctx == NULL) {
+ SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_MALLOC_FAILURE);
+ return 0;
+ }
+ if (!EVP_MD_CTX_copy_ex(ctx, s->s3->handshake_dgst)) {
+ SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
+ return 0;
+ }
+
+ ret = EVP_MD_CTX_size(ctx);
+ if (ret < 0) {
+ EVP_MD_CTX_reset(ctx);
+ return 0;
+ }
+
+ if ((sender != NULL && EVP_DigestUpdate(ctx, sender, len) <= 0)
+ || EVP_MD_CTX_ctrl(ctx, EVP_CTRL_SSL3_MASTER_SECRET,
+ s->session->master_key_length,
+ s->session->master_key) <= 0
+ || EVP_DigestFinal_ex(ctx, p, NULL) <= 0) {
+ SSLerr(SSL_F_SSL3_FINAL_FINISH_MAC, ERR_R_INTERNAL_ERROR);
+ ret = 0;
+ }
+
+ EVP_MD_CTX_free(ctx);
+
+ return ret;
+}