sign.c 5.3 KB

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  1. /* demos/sign/sign.c */
  2. /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  3. * All rights reserved.
  4. *
  5. * This package is an SSL implementation written
  6. * by Eric Young (eay@cryptsoft.com).
  7. * The implementation was written so as to conform with Netscapes SSL.
  8. *
  9. * This library is free for commercial and non-commercial use as long as
  10. * the following conditions are aheared to. The following conditions
  11. * apply to all code found in this distribution, be it the RC4, RSA,
  12. * lhash, DES, etc., code; not just the SSL code. The SSL documentation
  13. * included with this distribution is covered by the same copyright terms
  14. * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15. *
  16. * Copyright remains Eric Young's, and as such any Copyright notices in
  17. * the code are not to be removed.
  18. * If this package is used in a product, Eric Young should be given attribution
  19. * as the author of the parts of the library used.
  20. * This can be in the form of a textual message at program startup or
  21. * in documentation (online or textual) provided with the package.
  22. *
  23. * Redistribution and use in source and binary forms, with or without
  24. * modification, are permitted provided that the following conditions
  25. * are met:
  26. * 1. Redistributions of source code must retain the copyright
  27. * notice, this list of conditions and the following disclaimer.
  28. * 2. Redistributions in binary form must reproduce the above copyright
  29. * notice, this list of conditions and the following disclaimer in the
  30. * documentation and/or other materials provided with the distribution.
  31. * 3. All advertising materials mentioning features or use of this software
  32. * must display the following acknowledgement:
  33. * "This product includes cryptographic software written by
  34. * Eric Young (eay@cryptsoft.com)"
  35. * The word 'cryptographic' can be left out if the rouines from the library
  36. * being used are not cryptographic related :-).
  37. * 4. If you include any Windows specific code (or a derivative thereof) from
  38. * the apps directory (application code) you must include an acknowledgement:
  39. * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40. *
  41. * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42. * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43. * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44. * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45. * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46. * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47. * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48. * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49. * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50. * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51. * SUCH DAMAGE.
  52. *
  53. * The licence and distribution terms for any publically available version or
  54. * derivative of this code cannot be changed. i.e. this code cannot simply be
  55. * copied and put under another distribution licence
  56. * [including the GNU Public Licence.]
  57. */
  58. /*
  59. * sign-it.cpp - Simple test app using SSLeay envelopes to sign data
  60. * 29.9.1996, Sampo Kellomaki <sampo@iki.fi>
  61. */
  62. /* converted to C - eay :-) */
  63. /*
  64. * reformated a bit and converted to use the more common functions: this was
  65. * initially written at the dawn of time :-) - Steve.
  66. */
  67. #include <stdio.h>
  68. #include <openssl/rsa.h>
  69. #include <openssl/evp.h>
  70. #include <openssl/objects.h>
  71. #include <openssl/x509.h>
  72. #include <openssl/err.h>
  73. #include <openssl/pem.h>
  74. #include <openssl/ssl.h>
  75. int main()
  76. {
  77. int err;
  78. int sig_len;
  79. unsigned char sig_buf[4096];
  80. static char certfile[] = "cert.pem";
  81. static char keyfile[] = "key.pem";
  82. static char data[] = "I owe you...";
  83. EVP_MD_CTX md_ctx;
  84. EVP_PKEY *pkey;
  85. FILE *fp;
  86. X509 *x509;
  87. /*
  88. * Just load the crypto library error strings, SSL_load_error_strings()
  89. * loads the crypto AND the SSL ones
  90. */
  91. /* SSL_load_error_strings(); */
  92. ERR_load_crypto_strings();
  93. /* Read private key */
  94. fp = fopen(keyfile, "r");
  95. if (fp == NULL)
  96. exit(1);
  97. pkey = PEM_read_PrivateKey(fp, NULL, NULL, NULL);
  98. fclose(fp);
  99. if (pkey == NULL) {
  100. ERR_print_errors_fp(stderr);
  101. exit(1);
  102. }
  103. /* Do the signature */
  104. EVP_SignInit(&md_ctx, EVP_sha1());
  105. EVP_SignUpdate(&md_ctx, data, strlen(data));
  106. sig_len = sizeof(sig_buf);
  107. err = EVP_SignFinal(&md_ctx, sig_buf, &sig_len, pkey);
  108. if (err != 1) {
  109. ERR_print_errors_fp(stderr);
  110. exit(1);
  111. }
  112. EVP_PKEY_free(pkey);
  113. /* Read public key */
  114. fp = fopen(certfile, "r");
  115. if (fp == NULL)
  116. exit(1);
  117. x509 = PEM_read_X509(fp, NULL, NULL, NULL);
  118. fclose(fp);
  119. if (x509 == NULL) {
  120. ERR_print_errors_fp(stderr);
  121. exit(1);
  122. }
  123. /* Get public key - eay */
  124. pkey = X509_get_pubkey(x509);
  125. if (pkey == NULL) {
  126. ERR_print_errors_fp(stderr);
  127. exit(1);
  128. }
  129. /* Verify the signature */
  130. EVP_VerifyInit(&md_ctx, EVP_sha1());
  131. EVP_VerifyUpdate(&md_ctx, data, strlen((char *)data));
  132. err = EVP_VerifyFinal(&md_ctx, sig_buf, sig_len, pkey);
  133. EVP_PKEY_free(pkey);
  134. if (err != 1) {
  135. ERR_print_errors_fp(stderr);
  136. exit(1);
  137. }
  138. printf("Signature Verified Ok.\n");
  139. return (0);
  140. }