gvisor.dev/gvisor@v0.0.0-20240520182842-f9d4d51c7e0f/pkg/crypto/crypto_stdlib.go (about)

     1  // Copyright 2020 The gVisor Authors.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  //go:build !false
    16  // +build !false
    17  
    18  package crypto
    19  
    20  import (
    21  	"crypto/ecdsa"
    22  	"crypto/elliptic"
    23  	"crypto/sha512"
    24  	"fmt"
    25  	"math/big"
    26  )
    27  
    28  // EcdsaP384Sha384Verify verifies the signature in r, s of hash using ECDSA
    29  // P384 + SHA 384 and the public key, pub. Its return value records whether
    30  // the signature is valid.
    31  func EcdsaP384Sha384Verify(pub *ecdsa.PublicKey, data []byte, r, s *big.Int) (bool, error) {
    32  	if pub.Curve != elliptic.P384() {
    33  		return false, fmt.Errorf("unsupported key curve: want P-384, got %v", pub.Curve)
    34  	}
    35  	digest := sha512.Sum384(data)
    36  	return ecdsa.Verify(pub, digest[:], r, s), nil
    37  }
    38  
    39  // SumSha384 returns the SHA384 checksum of the data.
    40  func SumSha384(data []byte) ([sha512.Size384]byte, error) {
    41  	return sha512.Sum384(data), nil
    42  }