diff options
Diffstat (limited to 'openssl-1.1.0h/crypto/rand/rand_egd.c')
| -rw-r--r-- | openssl-1.1.0h/crypto/rand/rand_egd.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/openssl-1.1.0h/crypto/rand/rand_egd.c b/openssl-1.1.0h/crypto/rand/rand_egd.c new file mode 100644 index 0000000..50963b8 --- /dev/null +++ b/openssl-1.1.0h/crypto/rand/rand_egd.c @@ -0,0 +1,249 @@ +/* + * Copyright 2000-2016 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> +#ifdef OPENSSL_NO_EGD +NON_EMPTY_TRANSLATION_UNIT +#else + +# include <openssl/crypto.h> +# include <openssl/e_os2.h> +# include <openssl/rand.h> + +/*- + * Query the EGD <URL: http://www.lothar.com/tech/crypto/>. + * + * This module supplies three routines: + * + * RAND_query_egd_bytes(path, buf, bytes) + * will actually query "bytes" bytes of entropy form the egd-socket located + * at path and will write them to buf (if supplied) or will directly feed + * it to RAND_seed() if buf==NULL. + * The number of bytes is not limited by the maximum chunk size of EGD, + * which is 255 bytes. If more than 255 bytes are wanted, several chunks + * of entropy bytes are requested. The connection is left open until the + * query is competed. + * RAND_query_egd_bytes() returns with + * -1 if an error occurred during connection or communication. + * num the number of bytes read from the EGD socket. This number is either + * the number of bytes requested or smaller, if the EGD pool is + * drained and the daemon signals that the pool is empty. + * This routine does not touch any RAND_status(). This is necessary, since + * PRNG functions may call it during initialization. + * + * RAND_egd_bytes(path, bytes) will query "bytes" bytes and have them + * used to seed the PRNG. + * RAND_egd_bytes() is a wrapper for RAND_query_egd_bytes() with buf=NULL. + * Unlike RAND_query_egd_bytes(), RAND_status() is used to test the + * seed status so that the return value can reflect the seed state: + * -1 if an error occurred during connection or communication _or_ + * if the PRNG has still not received the required seeding. + * num the number of bytes read from the EGD socket. This number is either + * the number of bytes requested or smaller, if the EGD pool is + * drained and the daemon signals that the pool is empty. + * + * RAND_egd(path) will query 255 bytes and use the bytes retrieved to seed + * the PRNG. + * RAND_egd() is a wrapper for RAND_egd_bytes() with numbytes=255. + */ + +# if defined(OPENSSL_SYS_WIN32) || defined(OPENSSL_SYS_VMS) || defined(OPENSSL_SYS_MSDOS) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_VOS) || defined(OPENSSL_SYS_UEFI) +int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) +{ + return (-1); +} + +int RAND_egd(const char *path) +{ + return (-1); +} + +int RAND_egd_bytes(const char *path, int bytes) +{ + return (-1); +} +# else +# include <openssl/opensslconf.h> +# include OPENSSL_UNISTD +# include <stddef.h> +# include <sys/types.h> +# include <sys/socket.h> +# ifndef NO_SYS_UN_H +# ifdef OPENSSL_SYS_VXWORKS +# include <streams/un.h> +# else +# include <sys/un.h> +# endif +# else +struct sockaddr_un { + short sun_family; /* AF_UNIX */ + char sun_path[108]; /* path name (gag) */ +}; +# endif /* NO_SYS_UN_H */ +# include <string.h> +# include <errno.h> + +int RAND_query_egd_bytes(const char *path, unsigned char *buf, int bytes) +{ + int ret = 0; + struct sockaddr_un addr; + int len, num, numbytes; + int fd = -1; + int success; + unsigned char egdbuf[2], tempbuf[255], *retrievebuf; + + memset(&addr, 0, sizeof(addr)); + addr.sun_family = AF_UNIX; + if (strlen(path) >= sizeof(addr.sun_path)) + return (-1); + OPENSSL_strlcpy(addr.sun_path, path, sizeof(addr.sun_path)); + len = offsetof(struct sockaddr_un, sun_path) + strlen(path); + fd = socket(AF_UNIX, SOCK_STREAM, 0); + if (fd == -1) + return (-1); + success = 0; + while (!success) { + if (connect(fd, (struct sockaddr *)&addr, len) == 0) + success = 1; + else { + switch (errno) { +# ifdef EINTR + case EINTR: +# endif +# ifdef EAGAIN + case EAGAIN: +# endif +# ifdef EINPROGRESS + case EINPROGRESS: +# endif +# ifdef EALREADY + case EALREADY: +# endif + /* No error, try again */ + break; +# ifdef EISCONN + case EISCONN: + success = 1; + break; +# endif + default: + ret = -1; + goto err; /* failure */ + } + } + } + + while (bytes > 0) { + egdbuf[0] = 1; + egdbuf[1] = bytes < 255 ? bytes : 255; + numbytes = 0; + while (numbytes != 2) { + num = write(fd, egdbuf + numbytes, 2 - numbytes); + if (num >= 0) + numbytes += num; + else { + switch (errno) { +# ifdef EINTR + case EINTR: +# endif +# ifdef EAGAIN + case EAGAIN: +# endif + /* No error, try again */ + break; + default: + ret = -1; + goto err; /* failure */ + } + } + } + numbytes = 0; + while (numbytes != 1) { + num = read(fd, egdbuf, 1); + if (num == 0) + goto err; /* descriptor closed */ + else if (num > 0) + numbytes += num; + else { + switch (errno) { +# ifdef EINTR + case EINTR: +# endif +# ifdef EAGAIN + case EAGAIN: +# endif + /* No error, try again */ + break; + default: + ret = -1; + goto err; /* failure */ + } + } + } + if (egdbuf[0] == 0) + goto err; + if (buf) + retrievebuf = buf + ret; + else + retrievebuf = tempbuf; + numbytes = 0; + while (numbytes != egdbuf[0]) { + num = read(fd, retrievebuf + numbytes, egdbuf[0] - numbytes); + if (num == 0) + goto err; /* descriptor closed */ + else if (num > 0) + numbytes += num; + else { + switch (errno) { +# ifdef EINTR + case EINTR: +# endif +# ifdef EAGAIN + case EAGAIN: +# endif + /* No error, try again */ + break; + default: + ret = -1; + goto err; /* failure */ + } + } + } + ret += egdbuf[0]; + bytes -= egdbuf[0]; + if (!buf) + RAND_seed(tempbuf, egdbuf[0]); + } + err: + if (fd != -1) + close(fd); + return (ret); +} + +int RAND_egd_bytes(const char *path, int bytes) +{ + int num, ret = -1; + + num = RAND_query_egd_bytes(path, NULL, bytes); + if (num < 0) + goto err; + if (RAND_status() == 1) + ret = num; + err: + return (ret); +} + +int RAND_egd(const char *path) +{ + return (RAND_egd_bytes(path, 255)); +} + +# endif + +#endif |