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system76-edk2/CryptoPkg/Library/BaseCryptLib/Pk/CryptEc.c
Qi Zhang f21a1d48fe CryptoPkg: Add EC key retrieving and signature interface. 
This patch is used to retrieve EC key from PEM and X509 and
carry out the EC-DSA signature and verify it.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4102

Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Jian J Wang <jian.j.wang@intel.com>
Cc: Xiaoyu Lu <xiaoyu1.lu@intel.com>
Cc: Guomin Jiang <guomin.jiang@intel.com>
Signed-off-by: Qi Zhang <qi1.zhang@intel.com>
Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>
2022-10-12 05:56:00 +00:00

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/** @file
Elliptic Curve and ECDH API implementation based on OpenSSL
Copyright (c) 2022, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "InternalCryptLib.h"
#include <openssl/objects.h>
#include <openssl/bn.h>
#include <openssl/ec.h>
// =====================================================================================
// Basic Elliptic Curve Primitives
// =====================================================================================
/**
Return the Nid of certain ECC curve.
@param[in] CryptoNid Identifying number for the ECC curve (Defined in
BaseCryptLib.h).
@retval !=-1 On success.
@retval -1 ECC curve not supported.
**/
STATIC
INT32
CryptoNidToOpensslNid (
IN UINTN CryptoNid
)
{
INT32 Nid;
switch (CryptoNid) {
case CRYPTO_NID_SECP256R1:
Nid = NID_X9_62_prime256v1;
break;
case CRYPTO_NID_SECP384R1:
Nid = NID_secp384r1;
break;
case CRYPTO_NID_SECP521R1:
Nid = NID_secp521r1;
break;
default:
return -1;
}
return Nid;
}
/**
Initialize new opaque EcGroup object. This object represents an EC curve and
and is used for calculation within this group. This object should be freed
using EcGroupFree() function.
@param[in] CryptoNid Identifying number for the ECC curve (Defined in
BaseCryptLib.h).
@retval EcGroup object On success.
@retval NULL On failure.
**/
VOID *
EFIAPI
EcGroupInit (
IN UINTN CryptoNid
)
{
INT32 Nid;
Nid = CryptoNidToOpensslNid (CryptoNid);
if (Nid < 0) {
return NULL;
}
return EC_GROUP_new_by_curve_name (Nid);
}
/**
Get EC curve parameters. While elliptic curve equation is Y^2 mod P = (X^3 + AX + B) Mod P.
This function will set the provided Big Number objects to the corresponding
values. The caller needs to make sure all the "out" BigNumber parameters
are properly initialized.
@param[in] EcGroup EC group object.
@param[out] BnPrime Group prime number.
@param[out] BnA A coefficient.
@param[out] BnB B coefficient..
@param[in] BnCtx BN context.
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcGroupGetCurve (
IN CONST VOID *EcGroup,
OUT VOID *BnPrime,
OUT VOID *BnA,
OUT VOID *BnB,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_GROUP_get_curve (EcGroup, BnPrime, BnA, BnB, BnCtx);
}
/**
Get EC group order.
This function will set the provided Big Number object to the corresponding
value. The caller needs to make sure that the "out" BigNumber parameter
is properly initialized.
@param[in] EcGroup EC group object.
@param[out] BnOrder Group prime number.
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcGroupGetOrder (
IN VOID *EcGroup,
OUT VOID *BnOrder
)
{
return (BOOLEAN)EC_GROUP_get_order (EcGroup, BnOrder, NULL);
}
/**
Free previously allocated EC group object using EcGroupInit().
@param[in] EcGroup EC group object to free.
**/
VOID
EFIAPI
EcGroupFree (
IN VOID *EcGroup
)
{
EC_GROUP_free (EcGroup);
}
/**
Initialize new opaque EC Point object. This object represents an EC point
within the given EC group (curve).
@param[in] EC Group, properly initialized using EcGroupInit().
@retval EC Point object On success.
@retval NULL On failure.
**/
VOID *
EFIAPI
EcPointInit (
IN CONST VOID *EcGroup
)
{
return EC_POINT_new (EcGroup);
}
/**
Free previously allocated EC Point object using EcPointInit().
@param[in] EcPoint EC Point to free.
@param[in] Clear TRUE iff the memory should be cleared.
**/
VOID
EFIAPI
EcPointDeInit (
IN VOID *EcPoint,
IN BOOLEAN Clear
)
{
if (Clear) {
EC_POINT_clear_free (EcPoint);
} else {
EC_POINT_free (EcPoint);
}
}
/**
Get EC point affine (x,y) coordinates.
This function will set the provided Big Number objects to the corresponding
values. The caller needs to make sure all the "out" BigNumber parameters
are properly initialized.
@param[in] EcGroup EC group object.
@param[in] EcPoint EC point object.
@param[out] BnX X coordinate.
@param[out] BnY Y coordinate.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointGetAffineCoordinates (
IN CONST VOID *EcGroup,
IN CONST VOID *EcPoint,
OUT VOID *BnX,
OUT VOID *BnY,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_get_affine_coordinates (EcGroup, EcPoint, BnX, BnY, BnCtx);
}
/**
Set EC point affine (x,y) coordinates.
@param[in] EcGroup EC group object.
@param[in] EcPoint EC point object.
@param[in] BnX X coordinate.
@param[in] BnY Y coordinate.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointSetAffineCoordinates (
IN CONST VOID *EcGroup,
IN VOID *EcPoint,
IN CONST VOID *BnX,
IN CONST VOID *BnY,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_set_affine_coordinates (EcGroup, EcPoint, BnX, BnY, BnCtx);
}
/**
EC Point addition. EcPointResult = EcPointA + EcPointB.
@param[in] EcGroup EC group object.
@param[out] EcPointResult EC point to hold the result. The point should
be properly initialized.
@param[in] EcPointA EC Point.
@param[in] EcPointB EC Point.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointAdd (
IN CONST VOID *EcGroup,
OUT VOID *EcPointResult,
IN CONST VOID *EcPointA,
IN CONST VOID *EcPointB,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_add (EcGroup, EcPointResult, EcPointA, EcPointB, BnCtx);
}
/**
Variable EC point multiplication. EcPointResult = EcPoint * BnPScalar.
@param[in] EcGroup EC group object.
@param[out] EcPointResult EC point to hold the result. The point should
be properly initialized.
@param[in] EcPoint EC Point.
@param[in] BnPScalar P Scalar.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointMul (
IN CONST VOID *EcGroup,
OUT VOID *EcPointResult,
IN CONST VOID *EcPoint,
IN CONST VOID *BnPScalar,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_mul (EcGroup, EcPointResult, NULL, EcPoint, BnPScalar, BnCtx);
}
/**
Calculate the inverse of the supplied EC point.
@param[in] EcGroup EC group object.
@param[in,out] EcPoint EC point to invert.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointInvert (
IN CONST VOID *EcGroup,
IN OUT VOID *EcPoint,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_invert (EcGroup, EcPoint, BnCtx);
}
/**
Check if the supplied point is on EC curve.
@param[in] EcGroup EC group object.
@param[in] EcPoint EC point to check.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On curve.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointIsOnCurve (
IN CONST VOID *EcGroup,
IN CONST VOID *EcPoint,
IN VOID *BnCtx
)
{
return EC_POINT_is_on_curve (EcGroup, EcPoint, BnCtx) == 1;
}
/**
Check if the supplied point is at infinity.
@param[in] EcGroup EC group object.
@param[in] EcPoint EC point to check.
@retval TRUE At infinity.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointIsAtInfinity (
IN CONST VOID *EcGroup,
IN CONST VOID *EcPoint
)
{
return EC_POINT_is_at_infinity (EcGroup, EcPoint) == 1;
}
/**
Check if EC points are equal.
@param[in] EcGroup EC group object.
@param[in] EcPointA EC point A.
@param[in] EcPointB EC point B.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE A == B.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointEqual (
IN CONST VOID *EcGroup,
IN CONST VOID *EcPointA,
IN CONST VOID *EcPointB,
IN VOID *BnCtx
)
{
return EC_POINT_cmp (EcGroup, EcPointA, EcPointB, BnCtx) == 0;
}
/**
Set EC point compressed coordinates. Points can be described in terms of
their compressed coordinates. For a point (x, y), for any given value for x
such that the point is on the curve there will only ever be two possible
values for y. Therefore, a point can be set using this function where BnX is
the x coordinate and YBit is a value 0 or 1 to identify which of the two
possible values for y should be used.
@param[in] EcGroup EC group object.
@param[in] EcPoint EC Point.
@param[in] BnX X coordinate.
@param[in] YBit 0 or 1 to identify which Y value is used.
@param[in] BnCtx BN context, created with BigNumNewContext().
@retval TRUE On success.
@retval FALSE Otherwise.
**/
BOOLEAN
EFIAPI
EcPointSetCompressedCoordinates (
IN CONST VOID *EcGroup,
IN VOID *EcPoint,
IN CONST VOID *BnX,
IN UINT8 YBit,
IN VOID *BnCtx
)
{
return (BOOLEAN)EC_POINT_set_compressed_coordinates (EcGroup, EcPoint, BnX, YBit, BnCtx);
}
// =====================================================================================
// Elliptic Curve Diffie Hellman Primitives
// =====================================================================================
/**
Allocates and Initializes one Elliptic Curve Context for subsequent use
with the NID.
@param[in] Nid Identifying number for the ECC curve (Defined in
BaseCryptLib.h).
@return Pointer to the Elliptic Curve Context that has been initialized.
If the allocations fails, EcNewByNid() returns NULL.
**/
VOID *
EFIAPI
EcNewByNid (
IN UINTN Nid
)
{
INT32 OpenSslNid;
OpenSslNid = CryptoNidToOpensslNid (Nid);
if (OpenSslNid < 0) {
return NULL;
}
return (VOID *)EC_KEY_new_by_curve_name (OpenSslNid);
}
/**
Release the specified EC context.
@param[in] EcContext Pointer to the EC context to be released.
**/
VOID
EFIAPI
EcFree (
IN VOID *EcContext
)
{
EC_KEY_free ((EC_KEY *)EcContext);
}
/**
Generates EC key and returns EC public key (X, Y), Please note, this function uses
pseudo random number generator. The caller must make sure RandomSeed()
function was properly called before.
The Ec context should be correctly initialized by EcNewByNid.
This function generates random secret, and computes the public key (X, Y), which is
returned via parameter Public, PublicSize.
X is the first half of Public with size being PublicSize / 2,
Y is the second half of Public with size being PublicSize / 2.
EC context is updated accordingly.
If the Public buffer is too small to hold the public X, Y, FALSE is returned and
PublicSize is set to the required buffer size to obtain the public X, Y.
For P-256, the PublicSize is 64. First 32-byte is X, Second 32-byte is Y.
For P-384, the PublicSize is 96. First 48-byte is X, Second 48-byte is Y.
For P-521, the PublicSize is 132. First 66-byte is X, Second 66-byte is Y.
If EcContext is NULL, then return FALSE.
If PublicSize is NULL, then return FALSE.
If PublicSize is large enough but Public is NULL, then return FALSE.
@param[in, out] EcContext Pointer to the EC context.
@param[out] PublicKey Pointer to t buffer to receive generated public X,Y.
@param[in, out] PublicKeySize On input, the size of Public buffer in bytes.
On output, the size of data returned in Public buffer in bytes.
@retval TRUE EC public X,Y generation succeeded.
@retval FALSE EC public X,Y generation failed.
@retval FALSE PublicKeySize is not large enough.
**/
BOOLEAN
EFIAPI
EcGenerateKey (
IN OUT VOID *EcContext,
OUT UINT8 *PublicKey,
IN OUT UINTN *PublicKeySize
)
{
EC_KEY *EcKey;
CONST EC_GROUP *Group;
CONST EC_POINT *EcPoint;
BOOLEAN RetVal;
BIGNUM *BnX;
BIGNUM *BnY;
UINTN HalfSize;
INTN XSize;
INTN YSize;
if ((EcContext == NULL) || (PublicKeySize == NULL)) {
return FALSE;
}
if ((PublicKey == NULL) && (*PublicKeySize != 0)) {
return FALSE;
}
EcKey = (EC_KEY *)EcContext;
Group = EC_KEY_get0_group (EcKey);
HalfSize = (EC_GROUP_get_degree (Group) + 7) / 8;
// Assume RAND_seed was called
if (EC_KEY_generate_key (EcKey) != 1) {
return FALSE;
}
if (*PublicKeySize < HalfSize * 2) {
*PublicKeySize = HalfSize * 2;
return FALSE;
}
*PublicKeySize = HalfSize * 2;
EcPoint = EC_KEY_get0_public_key (EcKey);
if (EcPoint == NULL) {
return FALSE;
}
RetVal = FALSE;
BnX = BN_new ();
BnY = BN_new ();
if ((BnX == NULL) || (BnY == NULL)) {
goto fail;
}
if (EC_POINT_get_affine_coordinates (Group, EcPoint, BnX, BnY, NULL) != 1) {
goto fail;
}
XSize = BN_num_bytes (BnX);
YSize = BN_num_bytes (BnY);
if ((XSize <= 0) || (YSize <= 0)) {
goto fail;
}
ASSERT ((UINTN)XSize <= HalfSize && (UINTN)YSize <= HalfSize);
ZeroMem (PublicKey, *PublicKeySize);
BN_bn2bin (BnX, &PublicKey[0 + HalfSize - XSize]);
BN_bn2bin (BnY, &PublicKey[HalfSize + HalfSize - YSize]);
RetVal = TRUE;
fail:
BN_free (BnX);
BN_free (BnY);
return RetVal;
}
/**
Gets the public key component from the established EC context.
The Ec context should be correctly initialized by EcNewByNid, and successfully
generate key pair from EcGenerateKey().
For P-256, the PublicSize is 64. First 32-byte is X, Second 32-byte is Y.
For P-384, the PublicSize is 96. First 48-byte is X, Second 48-byte is Y.
For P-521, the PublicSize is 132. First 66-byte is X, Second 66-byte is Y.
@param[in, out] EcContext Pointer to EC context being set.
@param[out] PublicKey Pointer to t buffer to receive generated public X,Y.
@param[in, out] PublicKeySize On input, the size of Public buffer in bytes.
On output, the size of data returned in Public buffer in bytes.
@retval TRUE EC key component was retrieved successfully.
@retval FALSE Invalid EC key component.
**/
BOOLEAN
EFIAPI
EcGetPubKey (
IN OUT VOID *EcContext,
OUT UINT8 *PublicKey,
IN OUT UINTN *PublicKeySize
)
{
EC_KEY *EcKey;
CONST EC_GROUP *Group;
CONST EC_POINT *EcPoint;
BIGNUM *BnX;
BIGNUM *BnY;
UINTN HalfSize;
INTN XSize;
INTN YSize;
BOOLEAN RetVal;
if ((EcContext == NULL) || (PublicKeySize == NULL)) {
return FALSE;
}
if ((PublicKey == NULL) && (*PublicKeySize != 0)) {
return FALSE;
}
EcKey = (EC_KEY *)EcContext;
Group = EC_KEY_get0_group (EcKey);
HalfSize = (EC_GROUP_get_degree (Group) + 7) / 8;
if (*PublicKeySize < HalfSize * 2) {
*PublicKeySize = HalfSize * 2;
return FALSE;
}
*PublicKeySize = HalfSize * 2;
EcPoint = EC_KEY_get0_public_key (EcKey);
if (EcPoint == NULL) {
return FALSE;
}
RetVal = FALSE;
BnX = BN_new ();
BnY = BN_new ();
if ((BnX == NULL) || (BnY == NULL)) {
goto fail;
}
if (EC_POINT_get_affine_coordinates (Group, EcPoint, BnX, BnY, NULL) != 1) {
goto fail;
}
XSize = BN_num_bytes (BnX);
YSize = BN_num_bytes (BnY);
if ((XSize <= 0) || (YSize <= 0)) {
goto fail;
}
ASSERT ((UINTN)XSize <= HalfSize && (UINTN)YSize <= HalfSize);
if (PublicKey != NULL) {
ZeroMem (PublicKey, *PublicKeySize);
BN_bn2bin (BnX, &PublicKey[0 + HalfSize - XSize]);
BN_bn2bin (BnY, &PublicKey[HalfSize + HalfSize - YSize]);
}
RetVal = TRUE;
fail:
BN_free (BnX);
BN_free (BnY);
return RetVal;
}
/**
Computes exchanged common key.
Given peer's public key (X, Y), this function computes the exchanged common key,
based on its own context including value of curve parameter and random secret.
X is the first half of PeerPublic with size being PeerPublicSize / 2,
Y is the second half of PeerPublic with size being PeerPublicSize / 2.
If public key is compressed, the PeerPublic will only contain half key (X).
If EcContext is NULL, then return FALSE.
If PeerPublic is NULL, then return FALSE.
If PeerPublicSize is 0, then return FALSE.
If Key is NULL, then return FALSE.
If KeySize is not large enough, then return FALSE.
For P-256, the PeerPublicSize is 64. First 32-byte is X, Second 32-byte is Y.
For P-384, the PeerPublicSize is 96. First 48-byte is X, Second 48-byte is Y.
For P-521, the PeerPublicSize is 132. First 66-byte is X, Second 66-byte is Y.
@param[in, out] EcContext Pointer to the EC context.
@param[in] PeerPublic Pointer to the peer's public X,Y.
@param[in] PeerPublicSize Size of peer's public X,Y in bytes.
@param[in] CompressFlag Flag of PeerPublic is compressed or not.
@param[out] Key Pointer to the buffer to receive generated key.
@param[in, out] KeySize On input, the size of Key buffer in bytes.
On output, the size of data returned in Key buffer in bytes.
@retval TRUE EC exchanged key generation succeeded.
@retval FALSE EC exchanged key generation failed.
@retval FALSE KeySize is not large enough.
**/
BOOLEAN
EFIAPI
EcDhComputeKey (
IN OUT VOID *EcContext,
IN CONST UINT8 *PeerPublic,
IN UINTN PeerPublicSize,
IN CONST INT32 *CompressFlag,
OUT UINT8 *Key,
IN OUT UINTN *KeySize
)
{
EC_KEY *EcKey;
EC_KEY *PeerEcKey;
CONST EC_GROUP *Group;
BOOLEAN RetVal;
BIGNUM *BnX;
BIGNUM *BnY;
EC_POINT *Point;
INT32 OpenSslNid;
UINTN HalfSize;
if ((EcContext == NULL) || (PeerPublic == NULL) || (KeySize == NULL)) {
return FALSE;
}
if ((Key == NULL) && (*KeySize != 0)) {
return FALSE;
}
if (PeerPublicSize > INT_MAX) {
return FALSE;
}
EcKey = (EC_KEY *)EcContext;
Group = EC_KEY_get0_group (EcKey);
HalfSize = (EC_GROUP_get_degree (Group) + 7) / 8;
if ((CompressFlag == NULL) && (PeerPublicSize != HalfSize * 2)) {
return FALSE;
}
if ((CompressFlag != NULL) && (PeerPublicSize != HalfSize)) {
return FALSE;
}
if (*KeySize < HalfSize) {
*KeySize = HalfSize;
return FALSE;
}
*KeySize = HalfSize;
RetVal = FALSE;
Point = NULL;
BnX = BN_bin2bn (PeerPublic, (INT32)HalfSize, NULL);
BnY = NULL;
Point = EC_POINT_new (Group);
PeerEcKey = NULL;
if ((BnX == NULL) || (Point == NULL)) {
goto fail;
}
if (CompressFlag == NULL) {
BnY = BN_bin2bn (PeerPublic + HalfSize, (INT32)HalfSize, NULL);
if (BnY == NULL) {
goto fail;
}
if (EC_POINT_set_affine_coordinates (Group, Point, BnX, BnY, NULL) != 1) {
goto fail;
}
} else {
if (EC_POINT_set_compressed_coordinates (Group, Point, BnX, *CompressFlag, NULL) != 1) {
goto fail;
}
}
// Validate NIST ECDH public key
OpenSslNid = EC_GROUP_get_curve_name (Group);
PeerEcKey = EC_KEY_new_by_curve_name (OpenSslNid);
if (PeerEcKey == NULL) {
goto fail;
}
if (EC_KEY_set_public_key (PeerEcKey, Point) != 1) {
goto fail;
}
if (EC_KEY_check_key (PeerEcKey) != 1) {
goto fail;
}
if (ECDH_compute_key (Key, *KeySize, Point, EcKey, NULL) <= 0) {
goto fail;
}
RetVal = TRUE;
fail:
BN_free (BnX);
BN_free (BnY);
EC_POINT_free (Point);
EC_KEY_free (PeerEcKey);
return RetVal;
}
/**
Carries out the EC-DSA signature.
This function carries out the EC-DSA signature.
If the Signature buffer is too small to hold the contents of signature, FALSE
is returned and SigSize is set to the required buffer size to obtain the signature.
If EcContext is NULL, then return FALSE.
If MessageHash is NULL, then return FALSE.
If HashSize need match the HashNid. HashNid could be SHA256, SHA384, SHA512, SHA3_256, SHA3_384, SHA3_512.
If SigSize is large enough but Signature is NULL, then return FALSE.
For P-256, the SigSize is 64. First 32-byte is R, Second 32-byte is S.
For P-384, the SigSize is 96. First 48-byte is R, Second 48-byte is S.
For P-521, the SigSize is 132. First 66-byte is R, Second 66-byte is S.
@param[in] EcContext Pointer to EC context for signature generation.
@param[in] HashNid hash NID
@param[in] MessageHash Pointer to octet message hash to be signed.
@param[in] HashSize Size of the message hash in bytes.
@param[out] Signature Pointer to buffer to receive EC-DSA signature.
@param[in, out] SigSize On input, the size of Signature buffer in bytes.
On output, the size of data returned in Signature buffer in bytes.
@retval TRUE Signature successfully generated in EC-DSA.
@retval FALSE Signature generation failed.
@retval FALSE SigSize is too small.
**/
BOOLEAN
EFIAPI
EcDsaSign (
IN VOID *EcContext,
IN UINTN HashNid,
IN CONST UINT8 *MessageHash,
IN UINTN HashSize,
OUT UINT8 *Signature,
IN OUT UINTN *SigSize
)
{
EC_KEY *EcKey;
ECDSA_SIG *EcDsaSig;
INT32 OpenSslNid;
UINT8 HalfSize;
BIGNUM *R;
BIGNUM *S;
INTN RSize;
INTN SSize;
if ((EcContext == NULL) || (MessageHash == NULL)) {
return FALSE;
}
if (Signature == NULL) {
return FALSE;
}
EcKey = (EC_KEY *)EcContext;
OpenSslNid = EC_GROUP_get_curve_name (EC_KEY_get0_group (EcKey));
switch (OpenSslNid) {
case NID_X9_62_prime256v1:
HalfSize = 32;
break;
case NID_secp384r1:
HalfSize = 48;
break;
case NID_secp521r1:
HalfSize = 66;
break;
default:
return FALSE;
}
if (*SigSize < (UINTN)(HalfSize * 2)) {
*SigSize = HalfSize * 2;
return FALSE;
}
*SigSize = HalfSize * 2;
ZeroMem (Signature, *SigSize);
switch (HashNid) {
case CRYPTO_NID_SHA256:
if (HashSize != SHA256_DIGEST_SIZE) {
return FALSE;
}
break;
case CRYPTO_NID_SHA384:
if (HashSize != SHA384_DIGEST_SIZE) {
return FALSE;
}
break;
case CRYPTO_NID_SHA512:
if (HashSize != SHA512_DIGEST_SIZE) {
return FALSE;
}
break;
default:
return FALSE;
}
EcDsaSig = ECDSA_do_sign (
MessageHash,
(UINT32)HashSize,
(EC_KEY *)EcContext
);
if (EcDsaSig == NULL) {
return FALSE;
}
ECDSA_SIG_get0 (EcDsaSig, (CONST BIGNUM **)&R, (CONST BIGNUM **)&S);
RSize = BN_num_bytes (R);
SSize = BN_num_bytes (S);
if ((RSize <= 0) || (SSize <= 0)) {
ECDSA_SIG_free (EcDsaSig);
return FALSE;
}
ASSERT ((UINTN)RSize <= HalfSize && (UINTN)SSize <= HalfSize);
BN_bn2bin (R, &Signature[0 + HalfSize - RSize]);
BN_bn2bin (S, &Signature[HalfSize + HalfSize - SSize]);
ECDSA_SIG_free (EcDsaSig);
return TRUE;
}
/**
Verifies the EC-DSA signature.
If EcContext is NULL, then return FALSE.
If MessageHash is NULL, then return FALSE.
If Signature is NULL, then return FALSE.
If HashSize need match the HashNid. HashNid could be SHA256, SHA384, SHA512, SHA3_256, SHA3_384, SHA3_512.
For P-256, the SigSize is 64. First 32-byte is R, Second 32-byte is S.
For P-384, the SigSize is 96. First 48-byte is R, Second 48-byte is S.
For P-521, the SigSize is 132. First 66-byte is R, Second 66-byte is S.
@param[in] EcContext Pointer to EC context for signature verification.
@param[in] HashNid hash NID
@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 EC-DSA signature to be verified.
@param[in] SigSize Size of signature in bytes.
@retval TRUE Valid signature encoded in EC-DSA.
@retval FALSE Invalid signature or invalid EC context.
**/
BOOLEAN
EFIAPI
EcDsaVerify (
IN VOID *EcContext,
IN UINTN HashNid,
IN CONST UINT8 *MessageHash,
IN UINTN HashSize,
IN CONST UINT8 *Signature,
IN UINTN SigSize
)
{
INT32 Result;
EC_KEY *EcKey;
ECDSA_SIG *EcDsaSig;
INT32 OpenSslNid;
UINT8 HalfSize;
BIGNUM *R;
BIGNUM *S;
if ((EcContext == NULL) || (MessageHash == NULL) || (Signature == NULL)) {
return FALSE;
}
if ((SigSize > INT_MAX) || (SigSize == 0)) {
return FALSE;
}
EcKey = (EC_KEY *)EcContext;
OpenSslNid = EC_GROUP_get_curve_name (EC_KEY_get0_group (EcKey));
switch (OpenSslNid) {
case NID_X9_62_prime256v1:
HalfSize = 32;
break;
case NID_secp384r1:
HalfSize = 48;
break;
case NID_secp521r1:
HalfSize = 66;
break;
default:
return FALSE;
}
if (SigSize != (UINTN)(HalfSize * 2)) {
return FALSE;
}
switch (HashNid) {
case CRYPTO_NID_SHA256:
if (HashSize != SHA256_DIGEST_SIZE) {
return FALSE;
}
break;
case CRYPTO_NID_SHA384:
if (HashSize != SHA384_DIGEST_SIZE) {
return FALSE;
}
break;
case CRYPTO_NID_SHA512:
if (HashSize != SHA512_DIGEST_SIZE) {
return FALSE;
}
break;
default:
return FALSE;
}
EcDsaSig = ECDSA_SIG_new ();
if (EcDsaSig == NULL) {
ECDSA_SIG_free (EcDsaSig);
return FALSE;
}
R = BN_bin2bn (Signature, (UINT32)HalfSize, NULL);
S = BN_bin2bn (Signature + HalfSize, (UINT32)HalfSize, NULL);
if ((R == NULL) || (S == NULL)) {
ECDSA_SIG_free (EcDsaSig);
return FALSE;
}
ECDSA_SIG_set0 (EcDsaSig, R, S);
Result = ECDSA_do_verify (
MessageHash,
(UINT32)HashSize,
EcDsaSig,
(EC_KEY *)EcContext
);
ECDSA_SIG_free (EcDsaSig);
return (Result == 1);
}
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