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/** @file
RSA Asymmetric Cipher Wrapper Implementation over MbedTLS.
This file implements following APIs which provide basic capabilities for RSA:
1) RsaNew
2) RsaFree
3) RsaSetKey
4) RsaPkcs1Verify
RFC 8017 - PKCS #1: RSA Cryptography Specifications Version 2.2
Copyright (c) 2023, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "InternalCryptLib.h"
#include <mbedtls/rsa.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
)
{
VOID *RsaContext;
RsaContext = AllocateZeroPool (sizeof (mbedtls_rsa_context));
if (RsaContext == NULL) {
return RsaContext;
}
mbedtls_rsa_init (RsaContext);
if (mbedtls_rsa_set_padding (RsaContext, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE) != 0) {
return NULL;
}
return RsaContext;
}
/**
Release the specified RSA context.
@param[in] RsaContext Pointer to the RSA context to be released.
**/
VOID
EFIAPI
RsaFree (
IN VOID *RsaContext
)
{
mbedtls_rsa_free (RsaContext);
if (RsaContext != NULL) {
FreePool (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 component 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 component 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
)
{
mbedtls_rsa_context *RsaKey;
INT32 Ret;
mbedtls_mpi Value;
//
// Check input parameters.
//
if ((RsaContext == NULL) || (BnSize > INT_MAX)) {
return FALSE;
}
mbedtls_mpi_init (&Value);
RsaKey = (mbedtls_rsa_context *)RsaContext;
// if BigNumber is Null clear
if (BigNumber != NULL) {
Ret = mbedtls_mpi_read_binary (&Value, BigNumber, BnSize);
if (Ret != 0) {
mbedtls_mpi_free (&Value);
return FALSE;
}
}
switch (KeyTag) {
case RsaKeyN:
Ret = mbedtls_rsa_import (
RsaKey,
&Value,
NULL,
NULL,
NULL,
NULL
);
break;
case RsaKeyE:
Ret = mbedtls_rsa_import (
RsaKey,
NULL,
NULL,
NULL,
NULL,
&Value
);
break;
case RsaKeyD:
Ret = mbedtls_rsa_import (
RsaKey,
NULL,
NULL,
NULL,
&Value,
NULL
);
break;
case RsaKeyQ:
Ret = mbedtls_rsa_import (
RsaKey,
NULL,
NULL,
&Value,
NULL,
NULL
);
break;
case RsaKeyP:
Ret = mbedtls_rsa_import (
RsaKey,
NULL,
&Value,
NULL,
NULL,
NULL
);
break;
case RsaKeyDp:
case RsaKeyDq:
case RsaKeyQInv:
default:
Ret = -1;
break;
}
mbedtls_mpi_free (&Value);
return Ret == 0;
}
/**
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, SHA-256, SHA-384 or SHA-512 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 Ret;
mbedtls_md_type_t md_alg;
mbedtls_rsa_context *RsaKey;
if ((RsaContext == NULL) || (MessageHash == NULL) || (Signature == NULL)) {
return FALSE;
}
if ((SigSize > INT_MAX) || (SigSize == 0)) {
return FALSE;
}
RsaKey = (mbedtls_rsa_context *)RsaContext;
if (mbedtls_rsa_complete (RsaKey) != 0) {
return FALSE;
}
switch (HashSize) {
#ifdef ENABLE_MD5_DEPRECATED_INTERFACES
case MD5_DIGEST_SIZE:
md_alg = MBEDTLS_MD_MD5;
break;
#endif
#ifndef DISABLE_SHA1_DEPRECATED_INTERFACES
case SHA1_DIGEST_SIZE:
md_alg = MBEDTLS_MD_SHA1;
break;
#endif
case SHA256_DIGEST_SIZE:
md_alg = MBEDTLS_MD_SHA256;
break;
case SHA384_DIGEST_SIZE:
md_alg = MBEDTLS_MD_SHA384;
break;
case SHA512_DIGEST_SIZE:
md_alg = MBEDTLS_MD_SHA512;
break;
default:
return FALSE;
}
if (mbedtls_rsa_get_len (RsaContext) != SigSize) {
return FALSE;
}
mbedtls_rsa_set_padding (RsaContext, MBEDTLS_RSA_PKCS_V15, md_alg);
Ret = mbedtls_rsa_pkcs1_verify (
RsaContext,
md_alg,
(UINT32)HashSize,
MessageHash,
Signature
);
if (Ret != 0) {
return FALSE;
}
return TRUE;
}
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