Streamlined security for mobile and embedded devices
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| RSA BSAFE Micro Edition Suite |
Streamlined security for mobile and embedded devices |
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/* $Id: cm_open_strm_membio.c,v 1.9 2005/08/08 05:33:30 jlevander Exp $ */ /* * Copyright (C) 1998-2003 RSA Security Inc. * * This file shall only be used to demonstrate how to interface to an * RSA Security Inc. licensed development product. * * You have a royalty-free right to use, reproduce and distribute this * demonstration file, provided that you agree that RSA Security Inc. * has no warranty, implied or otherwise, or liability for this * demonstration file (including any modified version). This software * is provided "as is" without warranties or representations of any * kind. RSA Security disclaims all conditions and warranties, statutory * and otherwise, both express and implied, with respect to the software, * its quality and performance, including but not limited to, all * implied warranties of merchantability, fitness for a particular * purpose, title and noninfringement of third party rights. Without * limiting the foregoing, RSA Security does not warrant that the * software is error-free or that errors in the product will be * corrected. You agree that RSA Security shall not be liable for any * direct, indirect, incidental, special, consequential, punitive or * other damages whatsoever resulting from your use of this software * or any modified version. * * */ /* * @file cm_open_strm_membio.c * * This sample demonstrates opening a PKCS #7 enveloped data message using * the streaming interface. The data is supplied via a memory BIO. * * In its simplest form this sample decrypts the enveloped data. The optional * switches can be used to print the data and/or recipient information from * the enveloped data message. * * See cm_env.c to generate PKCS #7 enveloped data messages. * * For example, to: * * Open and decrypt a PKCS #7 enveloped data message (data within message): * cm_open_strm_membio -cm_msg env.data -keys rec_priv.key * -certs recipient.cert * * Decrypt a PKCS #7 enveloped data message (encrypted data in a separate * file): * The original data is printed along with the recipient information. * cm_open_strm_membio -cm_msg env.data -enc_msg data.env -keys rec_priv.key * -certs recipient.cert -print_data -print_recipient * * where: env.data = The output file where PKCS #7 data is written. * rec_priv.key = The private key of the recipient (matches the * certificate). * recipient.cert = The recipient's certificate. * data.env = The detached file containing only the encrypted * data. * */ #include "r_prod.h" #include "cm_com.h" #define BUF_LEN 256 #define BUF_FILE_LEN 48 /*4096*/ /* The usage help message */ static char *cm_open_usage[] = { "usage: cm_open [options]\n", "where options are:\n", " -cm_msg file - The file containing the cryptographic message\n", " -out file - The file to write the decrypted data into\n", " -no_ci - The cryptographic message has no ContentInfo\n", " -cert file - The certificate file\n", " -certtype encoding - The encoding of the certificate - only X509\n", " (default) supported\n", #ifdef NO_PEM " -certform format - The format of the certificate (BIN only)\n", #else " -certform format - The format of the certificate\n" " - one of BIN (default), PEM\n", #endif /* NO_PEM */ " -key file - The private key matching the certificate\n", " -keytype encoding - The encoding of the key - one of RSA (default)\n", #ifdef NO_PEM " -keyform format - The format of the key (BIN only)\n", #else " -keyform format - The format of the key\n" " - one of BIN (default), PEM\n", #endif /* NO_PEM */ " -print_recipient - Print the certificate information for each of\n", " the recipients in the cryptographic message\n", " -print_data - Print the enveloped data of the cryptographic\n", " message\n", #ifdef NO_SOFTWARE_CRYPTO " -no_fips140 - Use non FIPS140 crypto implementations\n", #endif /* NO_SOFTWARE_CRYPTO */ NULL }; /* * Main sample program entry point. * * @param argc [In] The number of arguments typed on the command line. * @param argv [In] The array of individual arguments from the command line. * * @returns R_ERROR_NONE indicates success.<br> * See @ref R_ERROR_IDS for valid values. */ int main(int argc, char **argv) { int ret = R_ERROR_NONE; int err; R_RES_LIST *res_list = NULL; R_LIB_CTX *lib_ctx = NULL; R_CM_CTX *ctx = NULL; R_CM *obj = NULL; R_CM *data_obj = NULL; R_CERT_CTX *cert_ctx = NULL; R_PKEY_CTX *pkey_ctx = NULL; R_CERT *cert = NULL; R_PKEY *pkey = NULL; BIO *bio_err = NULL; BIO *bio_out = NULL; BIO *bio_file = NULL; BIO *bio_mem_in= NULL; BIO *bio_cm = NULL; char *cm_file; char *data_file; char *out_file; char *keyfile; char *certfile; char *str; R_CERT_TYPE certtype; R_PKEY_TYPE keytype; R_FORMAT certform; R_FORMAT keyform; int detached; int print_data; int print_rec; int single; int no_ci; int len; int inlen; int intotal; int outlen; int lenWr; unsigned char buf[BUF_LEN]; unsigned char buffile[BUF_FILE_LEN]; /* Set the defaults */ cm_file = NULL; out_file = NULL; certfile = NULL; data_file = NULL; certtype = R_CERT_TYPE_X509; certform = R_FORMAT_BINARY; keyfile = NULL; keytype = R_PKEY_TYPE_RSA; keyform = R_FORMAT_BINARY; detached = 0; print_data = 0; print_rec = 0; single = 0; no_ci = 0; intotal = 0; outlen = 0; res_list = PRODUCT_DEFAULT_RESOURCE_LIST(); /* * Create BIO to stderr. BIOs are the Basic Input/Output mechanism provided * by RSA and are recommended for all input and output from applications. */ bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); if (bio_err == NULL) { ret = R_ERROR_ALLOC_FAILURE; goto end; } /* Parse the command line parameters */ /* Skip the program name */ argc--; argv++; /* Process all command line options */ while (argc >= 1) { if (Strcmp(*argv, "-cm_msg") == 0) { if (--argc < 1) { goto bad; } cm_file = *(++argv); } else if (Strcmp(*argv, "-data_msg") == 0) { if (--argc < 1) { goto bad; } data_file = *(++argv); } else if (Strcmp(*argv, "-out") == 0) { if (--argc < 1) { goto bad; } out_file = *(++argv); } else if (Strcmp(*argv, "-no_ci") == 0) { no_ci = 1; } else if (Strcmp(*argv, "-key") == 0) { if (--argc < 1) { goto bad; } keyfile = *(++argv); } else if (Strcmp(*argv, "-keytype") == 0) { if (--argc < 1) { goto bad; } str = *(++argv); if ((ret = R_PKEY_TYPE_from_string(&keytype, str)) != R_ERROR_NONE) { BIO_printf(bio_err, "Unknown key type %s\n", str); goto bad; } } else if (Strcmp(*argv, "-keyform") == 0) { if (--argc < 1) { goto bad; } str = *(++argv); if ((ret = R_FORMAT_from_string(str, &keyform)) != R_ERROR_NONE) { BIO_printf(bio_err, "Unknown key format %s\n", str); goto bad; } } else if (Strcmp(*argv, "-cert") == 0) { if (--argc < 1) { goto bad; } certfile = *(++argv); } else if (Strcmp(*argv, "-certtype") == 0) { if (--argc < 1) { goto bad; } str = *(++argv); if ((ret = R_CERT_TYPE_from_string(str, &certtype)) != R_ERROR_NONE) { BIO_printf(bio_err, "Unknown certificate type %s\n", str); goto bad; } } else if (Strcmp(*argv, "-certform") == 0) { if (--argc < 1) { goto bad; } str = *(++argv); if ((ret = R_FORMAT_from_string(str, &certform)) != R_ERROR_NONE) { BIO_printf(bio_err, "Unknown certificate format %s\n", str); goto bad; } } else if (Strcmp(*argv, "-print_data") == 0) { print_data = 1; } else if (Strcmp(*argv, "-print_recipient") == 0) { print_rec = 1; } #ifdef NO_SOFTWARE_CRYPTO else if (Strcmp(*argv, "-no_fips140") == 0) { res_list = PRODUCT_NON_FIPS_140_MODE_RESOURCE_LIST(); } #endif /* NO_SOFTWARE_CRYPTO */ else { BIO_printf(bio_err, "Unknown option %s\n", *argv); goto bad; } argc--; argv++; } /* Simple checks first */ if (cm_file == NULL) { BIO_printf(bio_err, "A cryptographic message file is required\n"); ret = R_ERROR_FAILED; goto bad; } if ((certfile == NULL) || (keyfile == NULL)) { BIO_printf(bio_err, "A recipient certificate and key are required.\n"); ret = R_ERROR_FAILED; goto bad; } /* Display the help menu if an invalid command line option was entered */ if (0) { char **pp; bad: for (pp = cm_open_usage; (*pp != NULL); pp++) { BIO_printf(bio_err, *pp); } goto end; } /* * Create a library context to provide access to all configurable aspects * of the library */ /* Create a new library context using the default resource list */ if ((ret = PRODUCT_LIBRARY_NEW(res_list, R_RES_FLAG_DEF, &lib_ctx)) != R_ERROR_NONE) { BIO_printf(bio_err, "Library new failure\n"); goto end; } /* * Create public key, certificate and cryptographic message contexts. These * contexts are required if any R_CERT_*, R_PKEY_* or R_CM_* routines are * used. */ /* Create a new certificate context */ if ((ret = R_CERT_CTX_new(lib_ctx, R_RES_FLAG_DEF, certtype, &cert_ctx)) != R_ERROR_NONE) { BIO_printf(bio_err, "The certificate context new failure\n"); goto end; } /* Create a new key context */ if ((ret = R_PKEY_CTX_new(lib_ctx, R_RES_FLAG_DEF, keytype, &pkey_ctx)) != R_ERROR_NONE) { BIO_printf(bio_err, "The private key context new failure\n"); goto end; } /* Create a new cryptographic message context */ if ((ret = R_CM_CTX_new(lib_ctx, R_RES_FLAG_DEF, R_CM_TYPE_DEFAULT, &ctx)) != R_ERROR_NONE) { BIO_printf(bio_err, "R_CM_CTX_new failure\n"); goto end; } /* Create a cryptographic message object */ if ((ret = R_CM_new(ctx, R_CM_TYPE_ENVELOPED_DATA, &obj)) != R_ERROR_NONE) { BIO_printf(bio_err, "Failed to create a cryptographic message object.\n"); goto end; } /* * Assign the cryptographic message object to the BIO. For streaming, a * stack of BIOs is formed and the data streamed through each BIO to * perform a specific part of the envelope decryption. */ ret = R_CM_to_BIO(obj, R_RES_FLAG_DEF, &bio_cm); if (ret != R_ERROR_NONE) { BIO_printf(bio_err, "Failed to create a BIO from cryptographic message object.\n"); goto end; } /* * The no_ci option notifies the cryptographic message BIO that the message * to be opened has no outer ContentInfo. It is supplied so that nested * cryptographic messages can be opened, since the nested messages must * have the ContentInfo removed. * * This sample assumes the message has type ENVELOPED_DATA. Therefore * an additional call to BIO_set_content_type() is not required. */ if (no_ci) { BIO_set_unwrapped(bio_cm); } /* * Create the envelope decryption input stream. Create the input BIO to * read the enveloped data and push the cryptographic message filter on * top of the input stream. */ if ((bio_mem_in = BIO_new_mem()) == NULL) { BIO_printf(bio_err, "Failed to create memory BIO\n"); ret = R_ERROR_FAILED; goto end; } /* Push the cryptographic message BIO onto the input stream */ BIO_push(bio_cm, bio_mem_in); /* * Open the file into which to write the decrypted enveloped * message content */ if ((bio_file = BIO_new_file(cm_file, "rb")) == NULL) { BIO_printf(bio_err, "Failed to open file: %s\n", cm_file); ret = R_ERROR_FAILED; goto end; } if (out_file != NULL) { if ((bio_out = BIO_new_file(out_file, "wb")) == NULL) { BIO_printf(bio_err, "Failed to open the output file: %s\n", out_file); ret = R_ERROR_FAILED; goto end; } } /* * Read in the certificate and key, and place them against the BIO. The * certificate and key are used to decrypt the symmetric key that was used * to decrypt the enveloped data. */ /* Read in the certificate from file */ if ((ret = R_CERT_read_file(cert_ctx, certfile, certtype, certform, &cert)) != R_ERROR_NONE) { BIO_printf(bio_err, "Certificate from file failure: %s\n", certfile); goto end; } /* * Set the recipient certificate to use when decrypting the enveloped * data header */ err = BIO_set_cert(bio_cm, cert); if (err != 1) { BIO_printf(bio_err, "Failed to set the cert against BIO\n"); ret = R_ERROR_FAILED; goto end; } /* Read in the key from file */ if ((ret = R_PKEY_from_file(pkey_ctx, &pkey, keyfile, keytype, keyform)) != R_ERROR_NONE) { BIO_printf(bio_err, "The private key from file failure: %s\n", keyfile); goto end; } /* * Set the asymmetric key to use when decrypting the enveloped data * header */ err = BIO_set_asym_key(bio_cm, pkey); if (err != 1) { BIO_printf(bio_err, "Failed to set the key against BIO\n"); ret = R_ERROR_FAILED; goto end; } /* * Read all application data from the input stream. Decrypt the data as it * is streamed in and output the decrypted data to the output stream. * Only one recipient can be decrypted at a time when using the streaming * interface. */ /* Read all application data */ while ((len = BIO_read(bio_cm, (char *)buf, BUF_LEN)) != 0) { /* * BIO_read may have returned three types of values: * >0 indicates some Bytes have been returned. * ==0 indicates there are no more Bytes - end of file. * <0 indicates that there may have been an error. */ if (len < 0) { /* * It could be just that all the streamed data has not arrived yet. In * this case, retry. See if any more data is available and push it into * the memory BIO. */ if (BIO_should_retry(bio_cm)) { /* * This is the part that simulates the data stream input (the data is * extracted from a file instead of a data stream in a typical * application). The file has PKCS #7 enveloped data. */ inlen = BIO_read(bio_file, (char *)buffile, BUF_FILE_LEN); if (inlen == 0) { /* * End of input file reached. Set the memory BIO to return end of * file. This end of file will take a few calls to BIO_read() to * propagate up the BIO stack. */ BIO_set_mem_eof_return(bio_mem_in, 0); } else { /* * Write data from file into the memory BIO. This is feeding the * data into memory BIO, that is, pushing data into the BIO stack. */ lenWr = BIO_write (bio_mem_in, (char *)buffile, inlen); intotal += inlen; } } else { /* A read error in the BIO stack occurred */ BIO_printf(bio_err, "ERROR: BIO Stack read error\n"); ret = R_ERROR_FAILED; goto end; } } else if (len > 0) { /* * Write data from the cryptographic message BIO to the output file. * This is the decrypted enveloped data. */ outlen += len; if (bio_out != NULL) { BIO_write(bio_out, (char *)buf, len); } if (print_data) { BIO_dump(bio_err, buf, len); } } } /* Print the encrypted data message if requested */ if (print_rec == 1) { /* * Print the enveloped data message. If print_data != 0 then the * data has been printed to bio_err. */ if ((ret = R_CM_write(obj, bio_err, R_FORMAT_TEXT, &print_data, 0)) != R_ERROR_NONE) { BIO_printf(bio_err, "Write the envelopedData data failure\n"); goto end; } } end: /* * Clean up. Report errors if there is an output stream using both the * error and the string representation. Destroy the dynamically allocated * objects and return an exit code. */ if ((ret != R_ERROR_NONE) && (bio_err != NULL)) { BIO_printf(bio_err, "ERROR: (%d) %s\n", ret, R_LIB_CTX_get_error_string(lib_ctx, R_RES_MOD_ID_LIBRARY, ret)); } if (bio_cm != NULL) { BIO_free(bio_cm); } if (obj != NULL) { R_CM_free(obj); } if (data_obj != NULL) { R_CM_free(data_obj); } if (ctx != NULL) { R_CM_CTX_free(ctx); } if (pkey != NULL) { R_PKEY_free(pkey); } if (pkey_ctx != NULL) { R_PKEY_CTX_free(pkey_ctx); } if (cert != NULL) { R_CERT_free(cert); } /* * The certificate context cannot be freed until the store has been emptied * as certificates in the store hold a reference to the certificate * context. */ if (cert_ctx != NULL) { R_CERT_CTX_free(cert_ctx); } if (bio_file != NULL) { BIO_free(bio_file); } if (bio_out != NULL) { BIO_free(bio_out); } if (lib_ctx != NULL) { PRODUCT_LIBRARY_FREE(lib_ctx); } if (bio_mem_in != NULL) { BIO_free(bio_mem_in); } if (bio_err != NULL) { BIO_free(bio_err); } return(R_ERROR_EXIT_CODE(ret)); }