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Diffstat (limited to 'openssl/crypto/engine/eng_rdrand.c')
| -rw-r--r-- | openssl/crypto/engine/eng_rdrand.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/openssl/crypto/engine/eng_rdrand.c b/openssl/crypto/engine/eng_rdrand.c new file mode 100644 index 000000000..a9ba5ae6f --- /dev/null +++ b/openssl/crypto/engine/eng_rdrand.c @@ -0,0 +1,142 @@ +/* ==================================================================== + * Copyright (c) 2011 The OpenSSL Project. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * 3. All advertising materials mentioning features or use of this + * software must display the following acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" + * + * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to + * endorse or promote products derived from this software without + * prior written permission. For written permission, please contact + * licensing@OpenSSL.org. + * + * 5. Products derived from this software may not be called "OpenSSL" + * nor may "OpenSSL" appear in their names without prior written + * permission of the OpenSSL Project. + * + * 6. Redistributions of any form whatsoever must retain the following + * acknowledgment: + * "This product includes software developed by the OpenSSL Project + * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" + * + * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY + * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR + * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, + * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) + * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED + * OF THE POSSIBILITY OF SUCH DAMAGE. + * ==================================================================== + */ + +#include <openssl/opensslconf.h> + +#include <stdio.h> +#include <string.h> +#include <openssl/engine.h> +#include <openssl/rand.h> +#include <openssl/err.h> + +#if (defined(__i386) || defined(__i386__) || defined(_M_IX86) || \ + defined(__x86_64) || defined(__x86_64__) || \ + defined(_M_AMD64) || defined (_M_X64)) && defined(OPENSSL_CPUID_OBJ) + +size_t OPENSSL_ia32_rdrand(void); + +static int get_random_bytes (unsigned char *buf, int num) + { + size_t rnd; + + while (num>=(int)sizeof(size_t)) { + if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0; + + *((size_t *)buf) = rnd; + buf += sizeof(size_t); + num -= sizeof(size_t); + } + if (num) { + if ((rnd = OPENSSL_ia32_rdrand()) == 0) return 0; + + memcpy (buf,&rnd,num); + } + + return 1; + } + +static int random_status (void) +{ return 1; } + +static RAND_METHOD rdrand_meth = + { + NULL, /* seed */ + get_random_bytes, + NULL, /* cleanup */ + NULL, /* add */ + get_random_bytes, + random_status, + }; + +static int rdrand_init(ENGINE *e) +{ return 1; } + +static const char *engine_e_rdrand_id = "rdrand"; +static const char *engine_e_rdrand_name = "Intel RDRAND engine"; + +static int bind_helper(ENGINE *e) + { + if (!ENGINE_set_id(e, engine_e_rdrand_id) || + !ENGINE_set_name(e, engine_e_rdrand_name) || + !ENGINE_set_init_function(e, rdrand_init) || + !ENGINE_set_RAND(e, &rdrand_meth) ) + return 0; + + return 1; + } + +static ENGINE *ENGINE_rdrand(void) + { + ENGINE *ret = ENGINE_new(); + if(!ret) + return NULL; + if(!bind_helper(ret)) + { + ENGINE_free(ret); + return NULL; + } + return ret; + } + +void ENGINE_load_rdrand (void) + { + extern unsigned int OPENSSL_ia32cap_P[]; + + if (OPENSSL_ia32cap_P[1] & (1<<(62-32))) + { + ENGINE *toadd = ENGINE_rdrand(); + if(!toadd) return; + ENGINE_add(toadd); + ENGINE_free(toadd); + ERR_clear_error(); + } + } +#else +void ENGINE_load_rdrand (void) {} +#endif |