首页 > 代码库 > polarssl rsa & aes 加密与解密

polarssl rsa & aes 加密与解密

2024-07-31 01:54:21   218人阅读

上周折腾加密与解密，用了openssl, crypto++, polarssl, cyassl, 说起真的让人很沮丧，只有openssl & polarssl两个库的RSA & AES 加密和解密，我用起来了，crypto++各种模板，各种多继承，看的头大，而且对各种常用的加密算法也不了解，所以这个库我在折腾了一天之后就放弃了；cyassl这个库现在没什么印象了；openssl没什么好说的，用起来很方便，尤其是使用win32openssl，都不用自己编译，下载下来安装好了就能用，着实方便；但是我是要在移动终端使用RSA & AES，研究了半天怎么只使用openssl的源代码，发现还真是麻烦；总之呢，现在我决定使用polarssl，接口简单易用，而且使用源代码进行编译，都是C文件，肯定是跨平台的了，很小，很精悍，下面帖出使用polarssl实现的RSA & AES加密和解密的过程，便于日后直接使用

  1 #include <stdio.h>  2 #include <stdlib.h>  3 #include <assert.h>  4 #include <string>  5   6 #include "polarssl/entropy.h"  7 #include "polarssl/ctr_drbg.h"  8 #include "polarssl/rsa.h"  9 #include "polarssl/aes.h" 10  11 const unsigned int RSA_KEY_SIZE = 1024;        // RSA 公钥的位数 12 const unsigned int AES_KEY_SIZE = 256; 13 const unsigned int EXPONENT = 65537; 14 const unsigned int BUFFER_SIZE = 1024; 15  16 class rsa 17 { 18 public: 19     rsa() 20     { 21         memset(rsa_n, 0, BUFFER_SIZE); 22         memset(rsa_e, 0, BUFFER_SIZE); 23         memset(rsa_d, 0, BUFFER_SIZE); 24         memset(rsa_p, 0, BUFFER_SIZE); 25         memset(rsa_q, 0, BUFFER_SIZE); 26         memset(rsa_dp, 0, BUFFER_SIZE); 27         memset(rsa_dq, 0, BUFFER_SIZE); 28         memset(rsa_qp, 0, BUFFER_SIZE);         29     } 30  31     unsigned char    rsa_n[BUFFER_SIZE]; 32     unsigned char    rsa_e[BUFFER_SIZE]; 33     unsigned char    rsa_d[BUFFER_SIZE]; 34     unsigned char    rsa_p[BUFFER_SIZE]; 35     unsigned char    rsa_q[BUFFER_SIZE]; 36     unsigned char    rsa_dp[BUFFER_SIZE]; 37     unsigned char    rsa_dq[BUFFER_SIZE]; 38     unsigned char    rsa_qp[BUFFER_SIZE]; 39  40     unsigned int n_len = BUFFER_SIZE; 41     unsigned int e_len = BUFFER_SIZE; 42     unsigned int d_len = BUFFER_SIZE; 43     unsigned int p_len = BUFFER_SIZE; 44     unsigned int q_len = BUFFER_SIZE; 45     unsigned int dp_len = BUFFER_SIZE; 46     unsigned int dq_len = BUFFER_SIZE;  47     unsigned int qp_len = BUFFER_SIZE; 48 }; 49  50 void generate_rsa(rsa& r) 51 { 52     // 生成RSA密钥对 53     rsa_context    rsa; 54     entropy_context    entropy; 55     ctr_drbg_context    ctr_drbg; 56  57     entropy_init(&entropy); 58  59     assert(ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, nullptr, 0) == 0); 60  61     rsa_init(&rsa, RSA_PKCS_V15, 0); 62  63     assert(rsa_gen_key(&rsa, ctr_drbg_random, &ctr_drbg, RSA_KEY_SIZE, EXPONENT) == 0); 64  65     assert(mpi_write_binary(&rsa.N, r.rsa_n, BUFFER_SIZE) == 0); 66     assert(mpi_write_binary(&rsa.E, r.rsa_e, BUFFER_SIZE) == 0); 67     assert(mpi_write_binary(&rsa.D, r.rsa_d, BUFFER_SIZE) == 0); 68     assert(mpi_write_binary(&rsa.P, r.rsa_p, BUFFER_SIZE) == 0); 69     assert(mpi_write_binary(&rsa.Q, r.rsa_q, BUFFER_SIZE) == 0); 70     assert(mpi_write_binary(&rsa.DP, r.rsa_dp, BUFFER_SIZE) == 0); 71     assert(mpi_write_binary(&rsa.DQ, r.rsa_dq, BUFFER_SIZE) == 0); 72     assert(mpi_write_binary(&rsa.QP, r.rsa_qp, BUFFER_SIZE) == 0); 73  74     //puts(r.rsa_n); 75     //puts(r.rsa_e); 76 } 77  78 // 加密 79 void encrypt( 80     const rsa &r,  81     const unsigned char* plaintext,  82     unsigned int plaintext_size,  83     unsigned char *ciphertext,  84     unsigned int &ciphertext_size) 85 { 86     rsa_context            rsa; 87     entropy_context        entropy; 88     ctr_drbg_context    ctr_drbg; 89  90     entropy_init(&entropy); 91     assert(ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, nullptr, 0) == 0); 92  93     rsa_init(&rsa, RSA_PKCS_V15, 0); 94  95     assert(mpi_read_binary(&rsa.N, r.rsa_n, BUFFER_SIZE) == 0); 96     assert(mpi_read_binary(&rsa.E, r.rsa_e, BUFFER_SIZE) == 0); 97  98     rsa.len = (mpi_msb(&rsa.N) + 7) >> 3; 99 100     assert(rsa_pkcs1_encrypt(&rsa, ctr_drbg_random, &ctr_drbg, RSA_PUBLIC, plaintext_size, plaintext, ciphertext) == 0);101 }102 103 // 解密104 void decrypt(105     const rsa &r, 106     const unsigned char* ciphertext, 107     unsigned int ciphertext_size, 108     unsigned char *plaintext, 109     unsigned int &plaintext_size)110 {111     rsa_context            rsa;112     entropy_context        entropy;113     ctr_drbg_context    ctr_drbg;114 115     entropy_init(&entropy);116     assert(ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, nullptr, 0) == 0);117 118     rsa_init(&rsa, RSA_PKCS_V15, 0);119 120     assert(mpi_read_binary(&rsa.N, r.rsa_n, BUFFER_SIZE) == 0);121     assert(mpi_read_binary(&rsa.E, r.rsa_e, BUFFER_SIZE) == 0);122     assert(mpi_read_binary(&rsa.D, r.rsa_d, BUFFER_SIZE) == 0);123     assert(mpi_read_binary(&rsa.P, r.rsa_p, BUFFER_SIZE) == 0);124     assert(mpi_read_binary(&rsa.Q, r.rsa_q, BUFFER_SIZE) == 0);125     assert(mpi_read_binary(&rsa.DP, r.rsa_dp, BUFFER_SIZE) == 0);126     assert(mpi_read_binary(&rsa.DQ, r.rsa_dq, BUFFER_SIZE) == 0);127     assert(mpi_read_binary(&rsa.QP, r.rsa_qp, BUFFER_SIZE) == 0);128 129     rsa.len = (mpi_msb(&rsa.N) + 7) >> 3;130 131     assert(rsa_pkcs1_decrypt(&rsa, ctr_drbg_random, &ctr_drbg, RSA_PRIVATE, &plaintext_size, ciphertext, plaintext, plaintext_size) == 0);132 }133 134 void test_aes()135 {136     // 产生随机的AES key buffer137     ctr_drbg_context ctr_drbg;138     entropy_context entropy;    139     unsigned char aes_key_buf[AES_KEY_SIZE] = { 0 };140     141     entropy_init(&entropy);142     assert(ctr_drbg_init(&ctr_drbg, entropy_func, &entropy, nullptr, 0) == 0);143     ctr_drbg_set_prediction_resistance(&ctr_drbg, CTR_DRBG_PR_OFF);144     ctr_drbg_random(&ctr_drbg, aes_key_buf, AES_KEY_SIZE);145 146     // 生成AES147     aes_context    aes_enc, aes_dec;    148     aes_init(&aes_enc);149     aes_init(&aes_dec);150 151     assert(aes_setkey_enc(&aes_enc, aes_key_buf, AES_KEY_SIZE) == 0);152     assert(aes_setkey_dec(&aes_dec, aes_key_buf, AES_KEY_SIZE) == 0);153 154     // 加密 & 解密. 明文与密文的长度是固定的， 都是16bytes155     /*156     const unsigned int DATA_SIZE = 16;157     unsigned char plaintext[DATA_SIZE] = { 0 };158     unsigned char ciphertext[DATA_SIZE] = { 0 };159     sprintf((char*)plaintext, "%s", "moyakukudi");160      161     assert(aes_crypt_ecb(&aes_enc, AES_ENCRYPT, plaintext, ciphertext) == 0);162     memset(plaintext, 0, DATA_SIZE);163     assert(aes_crypt_ecb(&aes_dec, AES_DECRYPT, ciphertext, plaintext) == 0);164     */165 166     // 加密 & 解密. 明文与密文的长度是不固定的, 但必须是16bytes的倍数167     const unsigned int DATA_SIZE = 1024;168     unsigned char plaintext[DATA_SIZE] = { 0 };169     unsigned char ciphertext[DATA_SIZE] = { 0 };170     sprintf((char*)plaintext, "%s", "return 0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH, assert(aes_crypt_ecb(&aes_dec, AES_DECRYPT, ciphertext, plaintext) == 0);");171 172     const unsigned int IV_SIZE = 16;173     unsigned char iv[IV_SIZE] = { 0 };174     //unsigned char iv2[IV_SIZE] = { 0 };175     //ctr_drbg_random(&ctr_drbg, iv, IV_SIZE);176     //strcpy((char*)iv2, (const char*)iv);177 178     assert(aes_crypt_cbc(&aes_enc, AES_ENCRYPT, DATA_SIZE, iv, plaintext, ciphertext) == 0);179     memset(plaintext, 0, DATA_SIZE);180     memset(iv, 0, IV_SIZE);181     assert(aes_crypt_cbc(&aes_dec, AES_DECRYPT, DATA_SIZE, iv, ciphertext, plaintext) == 0);182 183     puts("over");184 }185 186 int main()187 {188     goto    AES;189 190     // RSA191 RSA:192     rsa    r;193     generate_rsa(r);194 195     unsigned char    plaintext[] = "moyakukudi";196     unsigned char    ciphertext[BUFFER_SIZE] = { 0 };197     unsigned int    ciphertext_len = BUFFER_SIZE;198     encrypt(r, plaintext, sizeof(plaintext), ciphertext, ciphertext_len);199     200     unsigned char    output[BUFFER_SIZE] = { 0 };201     unsigned int    output_len = BUFFER_SIZE;202     decrypt(r, ciphertext, ciphertext_len, output, output_len);203 204     // AES205 AES:206 207     test_aes();208 209     system("pause");210     return 0;211 }

 

polarssl rsa & aes 加密与解密


联系
我们