p_sign.c 1.7 KB

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  1. /*
  2. * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
  3. *
  4. * Licensed under the Apache License 2.0 (the "License"). You may not use
  5. * this file except in compliance with the License. You can obtain a copy
  6. * in the file LICENSE in the source distribution or at
  7. * https://www.openssl.org/source/license.html
  8. */
  9. #include <stdio.h>
  10. #include "internal/cryptlib.h"
  11. #include <openssl/evp.h>
  12. #include <openssl/objects.h>
  13. #include <openssl/x509.h>
  14. #include "internal/evp_int.h"
  15. int EVP_SignFinal(EVP_MD_CTX *ctx, unsigned char *sigret,
  16. unsigned int *siglen, EVP_PKEY *pkey)
  17. {
  18. unsigned char m[EVP_MAX_MD_SIZE];
  19. unsigned int m_len = 0;
  20. int i = 0;
  21. size_t sltmp;
  22. EVP_PKEY_CTX *pkctx = NULL;
  23. *siglen = 0;
  24. if (EVP_MD_CTX_test_flags(ctx, EVP_MD_CTX_FLAG_FINALISE)) {
  25. if (!EVP_DigestFinal_ex(ctx, m, &m_len))
  26. goto err;
  27. } else {
  28. int rv = 0;
  29. EVP_MD_CTX *tmp_ctx = EVP_MD_CTX_new();
  30. if (tmp_ctx == NULL) {
  31. EVPerr(EVP_F_EVP_SIGNFINAL, ERR_R_MALLOC_FAILURE);
  32. return 0;
  33. }
  34. rv = EVP_MD_CTX_copy_ex(tmp_ctx, ctx);
  35. if (rv)
  36. rv = EVP_DigestFinal_ex(tmp_ctx, m, &m_len);
  37. EVP_MD_CTX_free(tmp_ctx);
  38. if (!rv)
  39. return 0;
  40. }
  41. sltmp = (size_t)EVP_PKEY_size(pkey);
  42. i = 0;
  43. pkctx = EVP_PKEY_CTX_new(pkey, NULL);
  44. if (pkctx == NULL)
  45. goto err;
  46. if (EVP_PKEY_sign_init(pkctx) <= 0)
  47. goto err;
  48. if (EVP_PKEY_CTX_set_signature_md(pkctx, EVP_MD_CTX_md(ctx)) <= 0)
  49. goto err;
  50. if (EVP_PKEY_sign(pkctx, sigret, &sltmp, m, m_len) <= 0)
  51. goto err;
  52. *siglen = sltmp;
  53. i = 1;
  54. err:
  55. EVP_PKEY_CTX_free(pkctx);
  56. return i;
  57. }