- Generate Public Key From Modulus And Exponent Online
- Generate Rsa Public Key From Modulus Exponent Online Calculator
Ssh-keygen -t ecdsa -b 521 -C 'ECDSA 521 bit Keys' Generate an ed25519 SSH keypair- this is a new algorithm added in OpenSSH. Ssh-keygen -t ed25519 Extracting the public key from an RSA keypair. Openssl rsa -pubout -in privatekey.pem -out publickey.pem Extracting the public key. Feb 13, 2014 node-rsa-pem-from-mod-exp. Create RSA Public Key PEM from Modulus and Exponent value in node.js.There are no dependencies to other modules for use. This allows you to use the modulus/exponent values for validating signed value.
Takes a RSA public key modulus and exponent in base64 encoding and produces a public key file in PEM format
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Makefile
Jun 01, 2012 Takes a RSA public key modulus and exponent in base64 encoding and produces a public key file in PEM format - Makefile. Takes a RSA public key modulus and exponent in base64 encoding and produces a public key file in PEM format - Makefile. If you've got a private key that can sign with it using the required signature algorithm then that should always be possible. Tool usage (such as openssl, which can be used to generate self signed certificates) is off topic here, but basically you just create the To Be Signed (TBS) part of the certificate and then, well, you sign it. Key generator windows 7 home basic.
CC = clang |
CFLAGS = |
DEPS = |
OBJ = modexp2pubkey.o |
LIBS = -lssl -lcrypto |
%.o: %.c $(DEPS) |
$(CC) -c -o $@$<$(CFLAGS) |
modexp2pubkey: $(OBJ) |
$(CC) -o $@$^$(CFLAGS)$(LIBS) |
.PHONY: clean |
clean: |
rm -f *.o |
modexp2pubkey.c
#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 Public Key From Modulus And Exponent Online
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