1.签名
#include <string.h> #include <openssl/rsa.h> #include <openssl/pem.h> #include <openssl/err.h> #include <openssl/sha.h> #include <openssl/crypto.h> /* * 参考https://blog.csdn.net/zjf535214685/article/details/82182241 */ #define PRIVATE_KEY_PATH ("./rsaprivatekey.pem") #define SHA_WHICH NID_sha256 #define WHICH_DIGEST_LENGTH SHA256_DIGEST_LENGTH void printHex(unsigned char *md, int len) { int i = 0; for (i = 0; i < len; i++) { printf("%02x", md[i]); } printf("\n"); } /*读取私钥*/ RSA* ReadPrivateKey(char* p_KeyPath) { FILE *fp = NULL; RSA *priRsa = NULL; printf("PrivateKeyPath[%s] \n", p_KeyPath); /* 打开密钥文件 */ if(NULL == (fp = fopen(p_KeyPath, "r"))) { printf( "fopen[%s] failed \n", p_KeyPath); return NULL; } /* 获取私钥 */ priRsa = PEM_read_RSAPrivateKey(fp, NULL, NULL,NULL); if(NULL == priRsa) { ERR_print_errors_fp(stdout); printf( "PEM_read_RSAPrivateKey\n"); fclose(fp); return NULL; } fclose(fp); return priRsa; } int test_RSA_sign(void) { char *data = "china"; char buf[128] = {0}; RSA *privKey = NULL; int nOutLen = sizeof(buf); int nRet = 0; //对数据进行sha256算法摘要 unsigned char md[WHICH_DIGEST_LENGTH]; SHA256((unsigned char *)data, strlen(data), md); printHex(md, WHICH_DIGEST_LENGTH); privKey = ReadPrivateKey(PRIVATE_KEY_PATH); if (!privKey) { ERR_print_errors_fp (stderr); return -1; } /* 签名 */ nRet = RSA_sign(SHA_WHICH, md, WHICH_DIGEST_LENGTH, buf, &nOutLen, privKey); if(nRet != 1) { printf("RSA_sign err !!! \n"); goto quit; } printf("RSA_sign len = %d:", nOutLen); printHex(buf, nOutLen); quit: RSA_free(privKey); return 0; } int main(int argc, char *argv[]) { test_RSA_sign(); return 0; }
2. 验签
#include <string.h> #include <openssl/rsa.h> #include <openssl/pem.h> #include <openssl/err.h> #include <openssl/sha.h> #include <openssl/crypto.h> /* * 参考https://blog.csdn.net/zjf535214685/article/details/82182241 */ #define PUBLIC_KEY_PATH ("./rsapubkey.pem") #define SHA_WHICH NID_sha256 #define WHICH_DIGEST_LENGTH SHA256_DIGEST_LENGTH void printHex(unsigned char *md, int len) { int i = 0; for (i = 0; i < len; i++) { printf("%02x", md[i]); } printf("\n"); } /*读取公匙*/ RSA* ReadPublicKey(char* p_KeyPath) { FILE *fp = NULL; RSA *pubRsa = NULL; printf("PublicKeyPath[%s]\n", p_KeyPath); /* 打开密钥文件 */ if(NULL == (fp = fopen(p_KeyPath, "r"))) { printf( "fopen[%s] \n", p_KeyPath); return NULL; } /* 获取公钥 */ if(NULL == (pubRsa = PEM_read_RSA_PUBKEY(fp, NULL, NULL,NULL))) { printf( "PEM_read_RSAPrivateKey error\n"); fclose(fp); return NULL; } fclose(fp); return pubRsa; } int test_RSA_verify(void) { char *data = "china"; char buf[128] = { 0x06,0x62,0x0b,0xb4,0x16,0xdf,0x52,0xb9, 0x42,0x53,0x05,0x95,0x12,0xbe,0x3e,0x4f, 0x9e,0x4d,0xed,0x20,0xf8,0x3a,0x07,0xad, 0xc4,0xe0,0x6d,0xb9,0xd5,0x35,0xe8,0xae, 0xf3,0x84,0xdb,0xd5,0x33,0x6f,0x10,0x9b, 0x47,0x8d,0x26,0x7a,0x50,0x9f,0xf9,0x57, 0xec,0xba,0xa3,0xc1,0x50,0xae,0x47,0xbb, 0xcb,0x6c,0x87,0x78,0x19,0xb3,0x1f,0x1f, 0x68,0x9a,0xc2,0x9e,0xde,0x3c,0xdd,0x97, 0x17,0x17,0xaf,0xd1,0xc9,0xfb,0x68,0x58, 0x19,0xbb,0xa4,0xf4,0x18,0x4d,0xe3,0xf3, 0xb0,0x8d,0x30,0xe6,0x5b,0x6d,0x5e,0x2f, 0xf5,0xe7,0x6b,0x30,0xf0,0x70,0xa4,0x69, 0xfa,0xb9,0xa8,0xdd,0xf0,0x71,0x99,0x6c, 0x7a,0xc2,0xce,0xe8,0x13,0x46,0x0c,0x85, 0x8e,0x3f,0x55,0xe3,0xe7,0x30,0xd1,0x7d, }; RSA *pubKey = NULL; int nOutLen = sizeof(buf); int nRet = 0; //对数据进行sha256算法摘要 unsigned char md[WHICH_DIGEST_LENGTH]; SHA256((unsigned char *)data, strlen(data), md); printHex(md, WHICH_DIGEST_LENGTH); pubKey = ReadPublicKey(PUBLIC_KEY_PATH); if (!pubKey) { printf("Error: can't load public key"); return -1; } /* 验签 */ nRet = RSA_verify(SHA_WHICH, md, WHICH_DIGEST_LENGTH, buf, nOutLen, pubKey); printf("RSA_verify %s(ret=%d).\r\n", (1 == nRet) ? "Success" : "Failed", nRet); RSA_free(pubKey); return 0; } int main(int argc, char *argv[]) { test_RSA_verify(); return 0; }
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