Generate Rsa Public Key From Modulus Exponent C
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- Generate Rsa Public Key From Modulus Exponent Java
- Generate Rsa Public Key From Modulus Exponent Online
I have a private key components p, q, Dp, Dq, and QInv. I need to calculate the public key modulus and exponent. Modulus was super simple p.q, but exponent I can't figure out. Have searched all the articles and often found how to go opposite way - generating public private key once you pick the exponenet. How to generate public/private key in C#. Asymmetric cryptography also known as public-key encryption uses a public/private key pair to encrypt and decrypt data. In.NET, the RSACryptoServiceProvider and DSACryptoServiceProvider classes are used for asymmetric encryption.
| #include<string.h> |
| #include<openssl/rsa.h> |
| #include<openssl/evp.h> |
| #include<openssl/bn.h> |
| #include<openssl/pem.h> |
| // cheating, . ignoring deprecation warnings |
| #pragma GCC diagnostic ignored '-Wdeprecated-declarations' |
| unsignedchar *base64_decode(constchar* base64data, int* len) { |
| BIO *b64, *bmem; |
| size_t length = strlen(base64data); |
| unsignedchar *buffer = (unsignedchar *)malloc(length); |
| b64 = BIO_new(BIO_f_base64()); |
| BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL); |
| bmem = BIO_new_mem_buf((void*)base64data, length); |
| bmem = BIO_push(b64, bmem); |
| *len = BIO_read(bmem, buffer, length); |
| BIO_free_all(bmem); |
| return buffer; |
| } |
| BIGNUM* bignum_base64_decode(constchar* base64bignum) { |
| BIGNUM* bn = NULL; |
| int len; |
| unsignedchar* data = base64_decode(base64bignum, &len); |
| if (len) { |
| bn = BN_bin2bn(data, len, NULL); |
| } |
| free(data); |
| return bn; |
| } |
| EVP_PKEY* RSA_fromBase64(constchar* modulus_b64, constchar* exp_b64) { |
| BIGNUM *n = bignum_base64_decode(modulus_b64); |
| BIGNUM *e = bignum_base64_decode(exp_b64); |
| if (!n) printf('Invalid encoding for modulusn'); |
| if (!e) printf('Invalid encoding for public exponentn'); |
| if (e && n) { |
| EVP_PKEY* pRsaKey = EVP_PKEY_new(); |
| RSA* rsa = RSA_new(); |
| rsa->e = e; |
| rsa->n = n; |
| EVP_PKEY_assign_RSA(pRsaKey, rsa); |
| return pRsaKey; |
| } else { |
| if (n) BN_free(n); |
| if (e) BN_free(e); |
| returnNULL; |
| } |
| } |
| voidassert_syntax(int argc, char** argv) { |
| if (argc != 4) { |
| fprintf(stderr, 'Description: %s takes a RSA public key modulus and exponent in base64 encoding and produces a public key file in PEM format.n', argv[0]); |
| fprintf(stderr, 'syntax: %s <modulus_base64> <exp_base64> <output_file>n', argv[0]); |
| exit(1); |
| } |
| } |
| intmain(int argc, char** argv) { |
| assert_syntax(argc, argv); |
| constchar* modulus = argv[1]; |
| constchar* exp = argv[2]; |
| constchar* filename = argv[3]; |
| EVP_PKEY* pkey = RSA_fromBase64(modulus, exp); |
| if (pkey NULL) { |
| fprintf(stderr, 'an error occurred :(n'); |
| return2; |
| } else { |
| printf('success decoded into RSA public keyn'); |
| FILE* file = fopen(filename, 'w'); |
| PEM_write_PUBKEY(file, pkey); |
| fflush(file); |
| fclose(file); |
| printf('written to file: %sn', filename); |
| } |
| return0; |
| } |
Generate Rsa Public Key From Modulus Exponent Java
