openSSL:如何用解码的密钥初始化EVP_PKEY对象?

时间:2017-11-03 11:17:54

标签: c++ c openssl

我有以下代码:

void Impl::sign()
{
    assert(!canonicalMessage_.empty());
    char* key = b64Decode(secureKey_);
    EVP_PKEY* pKey = NULL;
    EVP_MD_CTX* mdctx = NULL;
    std::size_t* slen = NULL;
    unsigned char** sig = NULL;
    *sig = NULL;
    // Create the Message Digest Context
    mdctx = EVP_MD_CTX_create();
    // Initialize the DigestSign operation.
    EVP_DigestSignInit(mdctx, NULL, EVP_sha256(), NULL, pKey);
    // Call update with the message
    const char* msg = canonicalMessage_.c_str();
    EVP_DigestSignUpdate(mdctx, msg, strlen(msg));

    // Obtain the length of the signature.
    EVP_DigestSignFinal(mdctx, NULL, slen);
    // Allocate memory for the signature based on size in slen
    *sig = (unsigned char*)OPENSSL_malloc(sizeof(unsigned char) * (*slen));
    // Obtain the signature
    EVP_DigestSignFinal(mdctx, *sig, slen);
    /* Clean up */
    if (*sig) OPENSSL_free(*sig);
    if(mdctx) EVP_MD_CTX_destroy(mdctx);
}

这里我使用b64Decode()内部函数获取解码密钥(定义无关紧要)。我的问题是如何将pKey key 初始化)传递给EVP_DigestSignInit函数。我找到了与此相关的链接(openSSL: how to initialize keys for public key encryption?),但与我的情况不同,此处使用了文件。

1 个答案:

答案 0 :(得分:1)

实际上,我通过下载此处指定的源代码找到了解决方案:https://wiki.openssl.org/index.php/EVP_Signing_and_Verifying

解决方案:

Dir/B/S/A-D-L-S