mirror of https://github.com/acidanthera/audk.git
129 lines
3.6 KiB
C
129 lines
3.6 KiB
C
/** @file
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PEM (Privacy Enhanced Mail) Format Handler Wrapper Implementation over OpenSSL.
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Copyright (c) 2010 - 2011, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "InternalCryptLib.h"
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#include <openssl/pem.h>
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/**
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Callback function for password phrase conversion used for retrieving the encrypted PEM.
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@param[out] Buf Pointer to the buffer to write the passphrase to.
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@param[in] Size Maximum length of the passphrase (i.e. the size of Buf).
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@param[in] Flag A flag which is set to 0 when reading and 1 when writing.
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@param[in] Key Key data to be passed to the callback routine.
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@retval The number of characters in the passphrase or 0 if an error occurred.
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**/
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INTN
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PasswordCallback (
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OUT CHAR8 *Buf,
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IN INTN Size,
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IN INTN Flag,
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IN VOID *Key
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)
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{
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INTN KeyLength;
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ZeroMem ((VOID *)Buf, (UINTN)Size);
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if (Key != NULL) {
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//
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// Duplicate key phrase directly.
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//
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KeyLength = (INTN) AsciiStrLen ((CHAR8 *)Key);
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KeyLength = (KeyLength > Size ) ? Size : KeyLength;
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CopyMem (Buf, Key, (UINTN) KeyLength);
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return KeyLength;
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} else {
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return 0;
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}
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}
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/**
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Retrieve the RSA Private Key from the password-protected PEM key data.
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@param[in] PemData Pointer to the PEM-encoded key data to be retrieved.
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@param[in] PemSize Size of the PEM key data in bytes.
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@param[in] Password NULL-terminated passphrase used for encrypted PEM key data.
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@param[out] RsaContext Pointer to new-generated RSA context which contain the retrieved
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RSA private key component. Use RsaFree() function to free the
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resource.
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If PemData is NULL, then ASSERT().
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If RsaContext is NULL, then ASSERT().
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@retval TRUE RSA Private Key was retrieved successfully.
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@retval FALSE Invalid PEM key data or incorrect password.
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**/
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BOOLEAN
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EFIAPI
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RsaGetPrivateKeyFromPem (
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IN CONST UINT8 *PemData,
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IN UINTN PemSize,
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IN CONST CHAR8 *Password,
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OUT VOID **RsaContext
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)
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{
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BOOLEAN Status;
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BIO *PemBio;
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//
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// ASSERT if PemData is NULL or RsaContext is NULL.
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//
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ASSERT (PemData != NULL);
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ASSERT (RsaContext != NULL);
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if (PemSize > INT_MAX) {
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return FALSE;
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}
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Status = FALSE;
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PemBio = NULL;
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//
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// Add possible block-cipher descriptor for PEM data decryption.
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// NOTE: Only support most popular ciphers (3DES, AES) for the encrypted PEM.
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//
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EVP_add_cipher (EVP_des_ede3_cbc());
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EVP_add_cipher (EVP_aes_128_cbc());
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EVP_add_cipher (EVP_aes_192_cbc());
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EVP_add_cipher (EVP_aes_256_cbc());
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//
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// Read encrypted PEM Data.
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//
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PemBio = BIO_new (BIO_s_mem ());
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BIO_write (PemBio, PemData, (int)PemSize);
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if (PemBio == NULL) {
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goto _Exit;
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}
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//
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// Retrieve RSA Private Key from encrypted PEM data.
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//
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*RsaContext = PEM_read_bio_RSAPrivateKey (PemBio, NULL, (pem_password_cb *)&PasswordCallback, (void *)Password);
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if (*RsaContext != NULL) {
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Status = TRUE;
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}
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_Exit:
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//
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// Release Resources.
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//
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BIO_free (PemBio);
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return Status;
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}
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