CryptHashCertificate

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This function hashes the entire encoded content of a certificate including its signature.

Syntax

BOOL WINAPI CryptHashCertificate(
  HCRYPTPROV hCryptProv,
  ALG_ID Algid,
  DWORD dwFlags,
  const BYTE* pbEncoded,
  DWORD cbEncoded,
  BYTE* pbComputedHash,
  DWORD* pcbComputedHash
);

Parameters

• hCryptProv
  [in] Handle to the CSP used to compute the hash.

  Unless there is a strong reason for passing in a specific cryptographic provider in the hCryptProv parameter, zero is passed in. Passing in zero causes the default RSA or DSS provider to be acquired before doing hash, signature verification, or recipient encryption operations.

• Algid
  [in] ALG_ID structure that specifies the hash algorithm to use. If the value of this parameter is zero, the default hash algorithm, SHA1, is used.

• dwFlags
  [in] Specifies the value to be passed to the hash API. For more information, see CryptCreateHash.

• pbEncoded
  [in] Address of the encoded content to be hashed.

• cbEncoded
  [in] Size, in bytes, of the encoded content.

• pbComputedHash
  [out] Pointer to a buffer to receive the computed hash. This parameter can be NULL to set the size of this information for memory allocation purposes.

• pcbComputedHash
  [in, out] On input, pointer to a DWORD that contains the size, in bytes, of the buffer pointed to by the pbComputedHash parameter. On output, the DWORD contains the number of bytes stored in the buffer.

  When processing the data returned in the buffer, applications must use the actual size of the data returned. The actual size can be slightly smaller than the size of the buffer specified on input. On input, buffer sizes are usually specified large enough to ensure that the largest possible output data fits in the buffer. On output, the variable pointed to by this parameter is updated to reflect the actual size of the data copied to the buffer.

Return Value

If the function succeeds, the return value is nonzero, or TRUE.

If the function fails, the return value is zero, or FALSE.

For extended error information, call the GetLastError function.

Errors from the called CryptCreateHash, CryptGetHashParam, and CryptHashData functions might be propagated to this function.

Requirements

See Also

Reference

CryptCreateHash
CryptHashPublicKeyInfo
CryptHashToBeSigned
ALG_ID