openssl + pkcs11代码

以下是使用 OpenSSL 和 PKCS#11 进行加解密的示例代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/evp.h>
#include <openssl/err.h>
#include <openssl/pkcs12.h>
#include <openssl/engine.h>
#include <openssl/pkcs11.h>

#define BUFSIZE 1024

int main(int argc, char *argv[]) {
    int rv, i;
    char *infile, *outfile, *password;
    FILE *in, *out;
    EVP_CIPHER_CTX *ctx = NULL;
    PKCS12 *p12 = NULL;
    X509 *cert = NULL;
    EVP_PKEY *pkey = NULL;
    PKCS11_CTX *p11ctx = NULL;
    CK_OBJECT_HANDLE hkey;
    CK_SESSION_HANDLE hsession;

    if (argc != 4) {
        printf("Usage: %s <infile> <outfile> <password>\n", argv[0]);
        return 1;
    }

    infile = argv[1];
    outfile = argv[2];
    password = argv[3];

    /* Initialize OpenSSL and PKCS#11 */
    ERR_load_crypto_strings();
    ENGINE_load_builtin_engines();
    ENGINE_register_all_complete();
    rv = PKCS11_CTX_init(&p11ctx, "pkcs11", NULL, NULL, 0);
    if (rv != CKR_OK) {
        printf("Error initializing PKCS#11 context\n");
        goto cleanup;
    }

    /* Load PKCS#12 file */
    in = fopen(infile, "rb");
    if (in == NULL) {
        printf("Error opening input file: %s\n", infile);
        goto cleanup;
    }
    p12 = d2i_PKCS12_fp(in, NULL);
    if (p12 == NULL) {
        printf("Error reading PKCS#12 file: %s\n", infile);
        goto cleanup;
    }
    fclose(in);

    /* Extract certificate and private key from PKCS#12 file */
    rv = PKCS12_parse(p12, password, &pkey, &cert, NULL);
    if (rv == 0) {
        printf("Error parsing PKCS#12 file: %s\n", infile);
        goto cleanup;
    }

    /* Find corresponding private key in PKCS#11 token */
    rv = PKCS11_CTX_login(p11ctx, CKU_USER, password);
    if (rv != CKR_OK) {
        printf("Error logging in to PKCS#11 token\n");
        goto cleanup;
    }
    hsession = PKCS11_CTX_get_session(p11ctx);
    rv = PKCS11_find_key(p11ctx, &hkey, cert, pkey);
    if (rv != CKR_OK) {
        printf("Error finding private key in PKCS#11 token\n");
        goto cleanup;
    }

    /* Initialize context for decryption */
    ctx = EVP_CIPHER_CTX_new();
    if (ctx == NULL) {
        printf("Error creating cipher context\n");
        goto cleanup;
    }
    rv = EVP_OpenInit(ctx, EVP_aes_256_cbc(), NULL, 0, NULL, pkey);
    if (rv != 1) {
        printf("Error initializing cipher context\n");
        goto cleanup;
    }

    /* Decrypt input file and write output file */
    in = fopen(infile, "rb");
    if (in == NULL) {
        printf("Error opening input file: %s\n", infile);
        goto cleanup;
    }
    out = fopen(outfile, "wb");
    if (out == NULL) {
        printf("Error opening output file: %s\n", outfile);
        goto cleanup;
    }
    while (1) {
        unsigned char inbuf[BUFSIZE], outbuf[BUFSIZE];
        int inlen, outlen;
        inlen = fread(inbuf, 1, BUFSIZE, in);
        if (inlen == 0) {
            break;
        }
        rv = EVP_OpenUpdate(ctx, outbuf, &outlen, inbuf, inlen);
        if (rv != 1) {
            printf("Error decrypting input file\n");
            goto cleanup;
        }
        fwrite(outbuf, 1, outlen, out);
    }
    rv = EVP_OpenFinal(ctx, NULL, 0);
    if (rv != 1) {
        printf("Error finalizing cipher context\n");
        goto cleanup;
    }
    fclose(in);
    fclose(out);

    printf("Decryption successful\n");

cleanup:
    if (ctx != NULL) {
        EVP_CIPHER_CTX_free(ctx);
    }
    if (p12 != NULL) {
        PKCS12_free(p12);
    }
    if (cert != NULL) {
        X509_free(cert);
    }
    if (pkey != NULL) {
        EVP_PKEY_free(pkey);
    }
    if (p11ctx != NULL) {
        PKCS11_CTX_logout(p11ctx);
        PKCS11_CTX_uninit(p11ctx);
    }
    ENGINE_cleanup();
    ERR_free_strings();

    return 0;
}

这是一个简单的解密示例，它可以从 PKCS#12 文件中提取证书和私钥，并使用 PKCS#11 模块从智能卡中获取私钥，然后使用 OpenSSL 中的 EVP 函数进行解密操作。你可以根据自己的需求进行修改和扩展。