go openssl rsa-pss 签名验签

使用openssl 生成rsa-pss 密钥

openssl genpkey -algorithm rsa-pss          \
    -pkeyopt rsa_keygen_bits:2048           \
    -pkeyopt rsa_pss_keygen_md:sha256       \
    -pkeyopt rsa_pss_keygen_mgf1_md:sha256  \
    -pkeyopt rsa_pss_keygen_saltlen:32      \
    -out rsa-pss-privateKey.pem

cat rsa-pss-privateKey.pem

openssl rsa -in rsa-pss-privateKey.pem -pubout -out rsa-pss-publicKey.pem

echo -n "hello world" > tbs.txt
openssl dgst -sha256 -sign rsa-pss-privateKey.pem -out tbs.sign tbs.txt 
hexdump -C tbs.sign

00000000 10 34 d7 ae 8d 29 b3 bb 81 b1 24 f8 e7 b5 55 95 |.4...)....$...U.|
00000010 8c 60 4b 70 1d 66 c8 e1 99 8a cb 7c 77 e9 dd 6e |.`Kp.f.....|w..n|
00000020 39 8c b7 91 1d a0 a3 f6 2c ef ee 1d 9f 4c e1 ae |9.......,....L..|
00000030 4c 78 10 37 cb aa 11 c8 cd 2a f7 a4 91 8a 6c 83 |Lx.7.....*....l.|
00000040 2c 32 fa 37 42 71 1d 5a bc 8d 2c d2 54 74 38 f5 |,2.7Bq.Z..,.Tt8.|
00000050 ca 33 a3 e9 54 f2 1b a2 72 71 9f 3c aa 7c c2 1c |.3..T...rq.<.|..|
00000060 e8 33 9f f8 a6 9a 9d ac f5 c4 cb e6 a9 da 66 7b |.3............f{|
00000070 6f f2 a9 cf 6b 9f 91 d8 f7 3d ec 74 f0 77 76 07 |o...k....=.t.wv.|
00000080 ec 60 32 bd cf 7f 22 f1 94 66 be 03 c3 1b 8d b3 |.`2..."..f......|
00000090 8c 21 a9 da d1 72 3c a0 f0 91 1d ae 05 18 13 ab |.!...r<.........|
000000a0 e6 3e c0 44 ea b6 43 f5 e2 8d 57 a7 8a 1d e3 75 |.>.D..C...W....u|
000000b0 bd b1 0e aa 4e b9 16 a9 56 67 4c 11 75 da b2 08 |....N...VgL.u...|
000000c0 bc bc 9a 1a 98 60 2b cc 51 6a b8 4d 2d 07 5c 61 |.....`+.Qj.M-.a|
000000d0 c3 89 00 a4 0a cd aa 17 50 ac 2a 3c 4d 28 3b 8d |........P.*<M(;.|
000000e0 32 29 75 f9 d6 79 72 34 f4 07 db 9f 42 25 ef 7a |2)u..yr4....B%.z|
000000f0 9c d2 b0 24 fd e0 91 d9 be 02 d3 ae da 38 28 f8 |...$.........8(.|

openssl dgst -sha256 -verify rsa-pss-publicKey.pem  -signature  tbs.sign -sigopt rsa_padding_mode:pss tbs.txt

Verified OK

使用不带pkeyopt的rsa密钥实现rsa-pss签名与验签时，使用

openssl dgst -sign [private_key_file] -sha256 -sigopt rsa_padding_mode:pss -out [output_file] [input_file]
openssl dgst -verify [public_key_file] -signature [signature_file] -sigopt rsa_padding_mode:pss [signature_message_file]

参考:https://linuxcommandlibrary.com/man/openssl-dgst

使用openssl pkeyutl 签名验签

openssl dgst -sha256 -binary -out tbs.sha256 tbs.txt
openssl pkeyutl -sign \
  -in tbs.sha256 -inkey rsa-pss-privateKey.pem \
  -out tbs.sign \
  -pkeyopt digest:sha256 \
  -pkeyopt rsa_padding_mode:pss \
  -pkeyopt rsa_pss_saltlen:-1

  openssl pkeyutl -verify \
  -in tbs.sha256 -sigfile tbs.sign \
  -pkeyopt rsa_padding_mode:pss \
  -pubin -inkey rsa-pss-publicKey.pem \
  -pkeyopt rsa_pss_saltlen:-1 \
  -pkeyopt digest:sha256

Signature Verified Successfully

GO 读取带pkeyopt的密钥

func pem_to_pri(pripem string) *rsa.PrivateKey {

    block, _ := pem.Decode([]byte(pripem))
    if block == nil || (block.Type != "PRIVATE KEY" && block.Type != "RSA PRIVATE KEY") {
        log.Fatal("failed to decode PEM", block)
        return nil
    }
    var oidPrivateKeyRsaPss = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 10}
    type pkcs8 struct {
        Version    int
        Algo       pkix.AlgorithmIdentifier
        PrivateKey []byte
    }
    var privKey pkcs8
    if _, err := asn1.Unmarshal(block.Bytes, &privKey); err != nil {
        return nil
    }

    if privKey.Algo.Algorithm.Equal(oidPrivateKeyRsaPss) {
        rsaPrivKey, err := x509.ParsePKCS1PrivateKey(privKey.PrivateKey)
        if err == nil {
            return rsaPrivKey
        }
    }
    rsaPrivKey, err := x509.ParsePKCS1PrivateKey(block.Bytes)

    if err != nil {
        log.Println(err)
        return nil
    }

    return rsaPrivKey
}

parsing the rsa pss key manually

func loadPrivateKey(pemEncodedPK string) (crypto.PrivateKey, error) {
    var oidPrivateKeyRsaPss = asn1.ObjectIdentifier{1, 2, 840, 113549, 1, 1, 10}
    block, _ := pem.Decode([]byte(pemEncodedPK))
    if block == nil {
        return nil, errors.New("empty block")
    }

    // taken from crypto/x509/pkcs8.go
    type pkcs8 struct {
        Version    int
        Algo       pkix.AlgorithmIdentifier
        PrivateKey []byte
        // optional attributes omitted.
    }
    var privKey pkcs8
    if _, err := asn1.Unmarshal(block.Bytes, &privKey); err != nil {
        return nil, err
    }

    if privKey.Algo.Algorithm.Equal(oidPrivateKeyRsaPss) {
        rsaPrivKey, err := x509.ParsePKCS1PrivateKey(privKey.PrivateKey)
        if err == nil {
            return rsaPrivKey, nil
        }
    }

    return nil, errors.New("unknown algorithm")
}

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go openssl rsa-pss 签名验签

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