(Erlang) 解析 ecsda public 密钥 pem 文件时出错

Question

我将私有和 public 密钥文件设为

openssl ecparam -name secp256k1 -genkey -out gen.pem

openssl ec -in gen.pem -pubout -out gen.pub

然后我检查了 .pub 文件

openssl pkey -in gen.pub  -pubin -text -noout

Public-Key: (256 bit)
pub: 
    04:fc:de:4f:2a:77:bd:c4:f2:74:2b:ba:b5:fc:85:
    e4:aa:96:a7:8e:86:14:bc:0d:fa:8e:d2:dd:50:3c:
    5d:fa:f4:07:f4:17:80:49:06:19:0c:72:03:63:4e:
    07:37:e9:10:64:c8:33:a4:a3:7e:26:d8:df:79:21:
    d7:2d:a6:01:80
ASN1 OID: secp256k1

之后开始erl

erl
Erlang/OTP 18 [erts-7.2] [source-e6dd627] [64-bit] [smp:3:3] [async-threads:10] [hipe] [kernel-poll:false]

命令执行后

1>rr(public_key),
  {ok,RawData} = file:read_file("gen.pub"),
  Decoded = public_key:pem_decode(RawData),
  [public_key:pem_entry_decode(X) || X <- Decoded ].

我有异常

** exception error: no match of right hand side value 
                    {error,{asn1,{invalid_length,1}}}
     in function  public_key:der_decode/2 (public_key.erl, line 229)

我知道有解决方法，但我想知道是我做错了什么还是 public 关键模块有错误？

UPD 1.

当我们看结果时

{ok,#'SubjectPublicKeyInfo'{algorithm = #'AlgorithmIdentifier'{algorithm = {1,2,840,10045,2,1},
                                                           parameters = <<6,5,43,129,4,0,10>>},
                        subjectPublicKey = <<4,241,200,19,168,25,25,81,43,216,
                                             89,201,37,62,66,39,166,231,161,98,
                                             223,133,119,12,...>>}}

我们接着看:

{1,2,840,10045,2,1} 是 ecPublicKey 的 oid http://oid-info.com/get/1.2.840.10045.2.1

参数 = <<6,5,43,129,4,0,10>>

'OTP-PUB-KEY':decode('EcpkParameters',<<6,5,43,129,4,0,10>>).

给我们

{ok,{namedCurve,{1,3,132,0,10}}}

和

pubkey_cert_records:namedCurves({1,3,132,0,10}).

为我们提供源曲线 - secp256k1，以及

 subjectPublicKey = <<4,241,200,19,168,25,25,81,43,216,
                    89,201,37,62,66,39,166,231,161,98,
                    223,133,119,12,...>>

是 public 密钥本身。但这是我之前所说的解决方法。

Answer 1

我尝试了您的步骤，它立即对我有用：

g@crayon2:~/test % openssl ecparam -name secp256k1 -genkey -out gen.pem

g@crayon2:~/test % openssl ec -in gen.pem -pubout -out gen.pub
read EC key
writing EC key

g@crayon2:~/test % openssl pkey -in gen.pub -pubin -text -noout
Public-Key: (256 bit)
pub: 
    04:f1:c8:13:a8:19:19:51:2b:d8:59:c9:25:3e:42:
    27:a6:e7:a1:62:df:85:77:0c:ef:f7:0e:0e:19:93:
    df:e6:f5:42:66:7e:ee:02:07:76:85:19:a4:a8:2d:
    03:11:73:0c:b2:d4:4c:c7:0e:42:d3:30:b5:51:e3:
    97:45:f8:b5:6a
ASN1 OID: secp256k1

g@crayon2:~/test % erl
Erlang/OTP 18 [erts-7.2.1] [source] [64-bit] [smp:4:4] [async-threads:10] [hipe] [kernel-poll:false]

Eshell V7.2.1  (abort with ^G)

1> rr(public_key).
['AAControls','ACClearAttrs','AccessDescription',
 'Algorithm','AlgorithmIdentifier',
 'AlgorithmIdentifierPKCS-10','AlgorithmIdentifierPKCS-8',
 'AlgorithmIdentifierPKCS5v2-0','AlgorithmIdentifierPKSC-7',
 'AlgorithmNull','AnotherName','AttCertValidityPeriod',
 'Attribute','AttributeCertificate',
 'AttributeCertificateInfo','AttributePKCS-10',
 'AttributePKCS-7','AttributeTypeAndValue',
 'Attributes_SETOF',
 'Attributes_SETOF_valuesWithContext_SETOF',
 'AuthorityKeyIdentifier','BasicConstraints',
 'BuiltInDomainDefinedAttribute','BuiltInStandardAttributes',
 'Certificate','CertificateList','CertificationRequest',
 'CertificationRequestInfo',
 'CertificationRequestInfo_attributes_SETOF'|...]

2> {ok,Data}=file:read_file("gen.pub").
{ok,<<"-----BEGIN PUBLIC KEY-----\nMFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAE8cgTqBkZUSvYWcklPkInpuehYt+Fdwzv\n9w4OGZPf5vVCZn7u"...>>}

3> Dec=public_key:pem_decode(Data).
[#'SubjectPublicKeyInfo'{algorithm = <<48,86,48,16,6,7,42,
                                       134,72,206,61,2,1,
                                       6,5,43,129,4,0,10,
                                       3,66,0,4,241,200,
                                       ...>>,
                         subjectPublicKey = not_encrypted}]

我的 OpenSSL 版本：

g@crayon2:~/test % openssl version
OpenSSL 1.0.1p-freebsd 9 Jul 2015

系统为FreeBSD 10.2-RELEASE。 Erlang 版本在上面的 shell 输出中。它为我生成的 gen.pub 密钥（如果你想尝试加载它）是：

g@crayon2:~/test % cat gen.pub
-----BEGIN PUBLIC KEY-----
MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAE8cgTqBkZUSvYWcklPkInpuehYt+Fdwzv
9w4OGZPf5vVCZn7uAgd2hRmkqC0DEXMMstRMxw5C0zC1UeOXRfi1ag==
-----END PUBLIC KEY-----

您是否想粘贴您的密钥以便我尝试加载它？

编辑：

抱歉，我错过了最后一步。这似乎是 OTP 代码中的错误。调用 der_decode/2 函数时将 KeyType 设置为 ECPoint，请参阅 pem_entry_decode/1 function. But der_decode/2 expects Asn1Type。直接调用 'OTP-PUB-KEY' 模块似乎有效：

8> Bin = hd(Dec)#'SubjectPublicKeyInfo'.algorithm.
32> 'OTP-PUB-KEY':decode('SubjectPublicKeyInfo', Bin).
{ok,#'SubjectPublicKeyInfo'{algorithm = #'AlgorithmIdentifier'{algorithm = {1,
                                                                            2,840,10045,2,1},
                                                               parameters = <<6,5,43,129,4,0,10>>},
                            subjectPublicKey = <<4,241,200,19,168,25,25,81,43,216,
                                                 89,201,37,62,66,39,166,231,161,98,
                                                 223,133,119,12,...>>}}

不过我不确定 returns 是否合理。也许值得使用您在此问题中发布的代码作为重现步骤在 OTP 中提出错误。然后至少有能力的人会验证它为什么不起作用。我确信您遵循的步骤没有问题，就 the documentation 而言，返回并传递给其他函数的类型是可以的。

Answer 2

我发现 public_key.erl 中的行（第 136-137 行）

'ECPoint' ->
     der_decode(KeyType, Key0)

必须替换为

'ECPoint' ->
     {{KeyType,Key0},der_decode('EcpkParameters', Params)}

(Erlang) 解析 ecsda public 密钥 pem 文件时出错

(Erlang) Got error while parsing ecsda public key pem file

erlang

public-key

pem

ecdsa