使用openssl dgst验证文件签名

Question

我在一些Java代码中签署数据包,我想验证C服务器上的签名.我想为此目的分叉openssl(以后总是可以使用库函数...当我知道openssl可以验证签名时); 但是,它没有这样做:

openssl dgst -verify cert.pem -signature file.sha1 file.data

• 它只是说" 无法加载密钥文件 "

证书说:

openssl verify cert.pem 

cert.pem: /C=....
error 20 at 0 depth lookup:unable to get local issuer certificate

但是,我特别不关心验证证书,我只想验证给定文件的签名!

输出openssl x509 -in cert.pem -noout -text是:

Certificate:
    Data:
        Version: 1 (0x0)
        Serial Number:
            ...
        Signature Algorithm: sha1WithRSAEncryption
        Issuer: C=...
        Validity
            Not Before: Feb  1 15:22:44 2010 GMT
            Not After : Jun 19 15:22:44 2037 GMT
        Subject: C=...
        Subject Public Key Info:
            Public Key Algorithm: rsaEncryption
            RSA Public Key: (2048 bit)
                Modulus (2048 bit):
                    00:cc:cc:f9:c7:3a:00:0f:07:90:55:d9:fb:a9:fe:
                    ...
                    32:cc:ee:7f:f2:01:c7:35:d2:b5:9b:35:dd:69:76:
                    00:a9
                Exponent: 65537 (0x10001)
    Signature Algorithm: sha1WithRSAEncryption
        39:d6:2c:6b:6a:00:74:b5:81:c2:b8:60:d6:6b:54:11:41:8d:
        ...
        8f:3e:3f:5d:b3:f8:dd:5e

Answer 1

openssl dgst -verify foo.pem期望foo.pem包含PEM格式的"原始"公钥.原始格式是SubjectPublicKeyInfo结构的编码,可以在证书中找到; 但openssl dgst不能一次性处理完整的证书.

您必须首先从证书中提取公钥:

openssl x509 -pubkey -noout -in cert.pem > pubkey.pem

然后使用密钥验证签名:

openssl dgst -verify pubkey.pem -signature sigfile datafile