/** @file
RSA Asymmetric Cipher Wrapper Implementation over OpenSSL.
This file implements following APIs which provide basic capabilities for RSA:
1) RsaNew
2) RsaFree
3) RsaSetKey
4) RsaPkcs1Verify
Copyright (c) 2009 - 2015, Intel Corporation. All rights reserved.<BR>
This program and the accompanying materials
are licensed and made available under the terms and conditions of the BSD License
which accompanies this distribution. The full text of the license may be found at
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "InternalCryptLib.h"
#include <openssl/bn.h>
#include <openssl/rsa.h>
#include <openssl/objects.h>
/**
Allocates and initializes one RSA context for subsequent use.
@return Pointer to the RSA context that has been initialized.
If the allocations fails, RsaNew() returns NULL.
**/
VOID *
EFIAPI
RsaNew (
VOID
)
{
//
// Allocates & Initializes RSA Context by OpenSSL RSA_new()
//
return (VOID *) RSA_new ();
}
/**
Release the specified RSA context.
@param[in] RsaContext Pointer to the RSA context to be released.
**/
VOID
EFIAPI
RsaFree (
IN VOID *RsaContext
)
{
//
// Free OpenSSL RSA Context
//
RSA_free ((RSA *) RsaContext);
}
/**
Sets the tag-designated key component into the established RSA context.
This function sets the tag-designated RSA key component into the established
RSA context from the user-specified non-negative integer (octet string format
represented in RSA PKCS#1).
If BigNumber is NULL, then the specified key componenet in RSA context is cleared.
If RsaContext is NULL, then return FALSE.
@param[in, out] RsaContext Pointer to RSA context being set.
@param[in] KeyTag Tag of RSA key component being set.
@param[in] BigNumber Pointer to octet integer buffer.
If NULL, then the specified key componenet in RSA
context is cleared.
@param[in] BnSize Size of big number buffer in bytes.
If BigNumber is NULL, then it is ignored.
@retval TRUE RSA key component was set successfully.
@retval FALSE Invalid RSA key component tag.
**/
BOOLEAN
EFIAPI
RsaSetKey (
IN OUT VOID *RsaContext,
IN RSA_KEY_TAG KeyTag,
IN CONST UINT8 *BigNumber,
IN UINTN BnSize
)
{
RSA *RsaKey;
//
// Check input parameters.
//
if (RsaContext == NULL || BnSize > INT_MAX) {
return FALSE;
}
RsaKey = (RSA *) RsaContext;
//
// Set RSA Key Components by converting octet string to OpenSSL BN representation.
// NOTE: For RSA public key (used in signature verification), only public components
// (N, e) are needed.
//
switch (KeyTag) {
//
// RSA Public Modulus (N)
//
case RsaKeyN:
if (RsaKey->n != NULL) {
BN_free (RsaKey->n);
}
RsaKey->n = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->n = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->n);
if (RsaKey->n == NULL) {
return FALSE;
}
break;
//
// RSA Public Exponent (e)
//
case RsaKeyE:
if (RsaKey->e != NULL) {
BN_free (RsaKey->e);
}
RsaKey->e = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->e = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->e);
if (RsaKey->e == NULL) {
return FALSE;
}
break;
//
// RSA Private Exponent (d)
//
case RsaKeyD:
if (RsaKey->d != NULL) {
BN_free (RsaKey->d);
}
RsaKey->d = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->d = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->d);
if (RsaKey->d == NULL) {
return FALSE;
}
break;
//
// RSA Secret Prime Factor of Modulus (p)
//
case RsaKeyP:
if (RsaKey->p != NULL) {
BN_free (RsaKey->p);
}
RsaKey->p = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->p = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->p);
if (RsaKey->p == NULL) {
return FALSE;
}
break;
//
// RSA Secret Prime Factor of Modules (q)
//
case RsaKeyQ:
if (RsaKey->q != NULL) {
BN_free (RsaKey->q);
}
RsaKey->q = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->q = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->q);
if (RsaKey->q == NULL) {
return FALSE;
}
break;
//
// p's CRT Exponent (== d mod (p - 1))
//
case RsaKeyDp:
if (RsaKey->dmp1 != NULL) {
BN_free (RsaKey->dmp1);
}
RsaKey->dmp1 = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->dmp1 = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->dmp1);
if (RsaKey->dmp1 == NULL) {
return FALSE;
}
break;
//
// q's CRT Exponent (== d mod (q - 1))
//
case RsaKeyDq:
if (RsaKey->dmq1 != NULL) {
BN_free (RsaKey->dmq1);
}
RsaKey->dmq1 = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->dmq1 = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->dmq1);
if (RsaKey->dmq1 == NULL) {
return FALSE;
}
break;
//
// The CRT Coefficient (== 1/q mod p)
//
case RsaKeyQInv:
if (RsaKey->iqmp != NULL) {
BN_free (RsaKey->iqmp);
}
RsaKey->iqmp = NULL;
if (BigNumber == NULL) {
break;
}
RsaKey->iqmp = BN_bin2bn (BigNumber, (UINT32) BnSize, RsaKey->iqmp);
if (RsaKey->iqmp == NULL) {
return FALSE;
}
break;
default:
return FALSE;
}
return TRUE;
}
/**
Verifies the RSA-SSA signature with EMSA-PKCS1-v1_5 encoding scheme defined in
RSA PKCS#1.
If RsaContext is NULL, then return FALSE.
If MessageHash is NULL, then return FALSE.
If Signature is NULL, then return FALSE.
If HashSize is not equal to the size of MD5, SHA-1 or SHA-256 digest, then return FALSE.
@param[in] RsaContext Pointer to RSA context for signature verification.
@param[in] MessageHash Pointer to octet message hash to be checked.
@param[in] HashSize Size of the message hash in bytes.
@param[in] Signature Pointer to RSA PKCS1-v1_5 signature to be verified.
@param[in] SigSize Size of signature in bytes.
@retval TRUE Valid signature encoded in PKCS1-v1_5.
@retval FALSE Invalid signature or invalid RSA context.
**/
BOOLEAN
EFIAPI
RsaPkcs1Verify (
IN VOID *RsaContext,
IN CONST UINT8 *MessageHash,
IN UINTN HashSize,
IN CONST UINT8 *Signature,
IN UINTN SigSize
)
{
INT32 DigestType;
UINT8 *SigBuf;
//
// Check input parameters.
//
if (RsaContext == NULL || MessageHash == NULL || Signature == NULL) {
return FALSE;
}
if (SigSize > INT_MAX || SigSize == 0) {
return FALSE;
}
//
// Determine the message digest algorithm according to digest size.
// Only MD5, SHA-1 or SHA-256 algorithm is supported.
//
switch (HashSize) {
case MD5_DIGEST_SIZE:
DigestType = NID_md5;
break;
case SHA1_DIGEST_SIZE:
DigestType = NID_sha1;
break;
case SHA256_DIGEST_SIZE:
DigestType = NID_sha256;
break;
default:
return FALSE;
}
SigBuf = (UINT8 *) Signature;
return (BOOLEAN) RSA_verify (
DigestType,
MessageHash,
(UINT32) HashSize,
SigBuf,
(UINT32) SigSize,
(RSA *) RsaContext
);
}