X509_get_pubkey

X509_get_pubkey

 OpenSSL verify RSA signature, read RSA public key from X509 PEM certificate 
X509_get_pubkey
X509_get_pubkey Free

 openssl-verify-rsa-signature.c 

#include<stdio.h>
#include<openssl/pem.h>
#include<openssl/rsa.h>
voidverifyRSASignature(unsignedchar *originalMessage, unsignedint om_length,
unsignedchar *signature, unsigned siglen)
{
int result;
 FILE *file;
 X509 *x509;
 EVP_PKEY *evp_pubkey;
 RSA *rsa_pubkey;
 file = fopen('developer_signer.pem', 'r');
 x509 = PEM_read_X509(file, NULL, NULL, NULL);
 evp_pubkey = X509_get_pubkey(x509);
 rsa_pubkey = EVP_PKEY_get1_RSA(evp_pubkey);
 result = RSA_verify(NID_md5, originalMessage, om_length,
 signature, siglen, rsa_pubkey);
printf('Signature is %sn', result 1 ? 'valid' : 'invalid');
RSA_free(rsa_pubkey);
EVP_PKEY_free(evp_pubkey);
X509_free(x509);
fclose(file);
}
X509_get_pubkey

OpenSSL verify RSA signature, read RSA public key from X509 PEM certificate - openssl-verify-rsa-signature.c. Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.
 commented Aug 19, 2019
This function is wrong. originalMessage has to be the message digest. Check out the manpage: https://www.openssl.org/docs/man1.1.1/man3/RSA_verify.html

 openssl-verify-rsa-signature.c 
#include<stdio.h>
#include<openssl/pem.h>
#include<openssl/rsa.h>
voidverifyRSASignature(unsignedchar *originalMessage, unsignedint om_length,
unsignedchar *signature, unsigned siglen)
{
int result;
 FILE *file;
 X509 *x509;
 EVP_PKEY *evp_pubkey;
 RSA *rsa_pubkey;
 file = fopen('developer_signer.pem', 'r');
 x509 = PEM_read_X509(file, NULL, NULL, NULL);
 evp_pubkey = X509_get_pubkey(x509);
 rsa_pubkey = EVP_PKEY_get1_RSA(evp_pubkey);
 result = RSA_verify(NID_md5, originalMessage, om_length,
 signature, siglen, rsa_pubkey);
printf('Signature is %sn', result 1 ? 'valid' : 'invalid');
RSA_free(rsa_pubkey);
EVP_PKEY_free(evp_pubkey);
X509_free(x509);
fclose(file);
}
X509_get_pubkeyOpenSSL verify RSA signature, read RSA public key from X509 PEM certificate - openssl-verify-rsa-signature.c. Pastebin.com is the number one paste tool since 2002. Pastebin is a website where you can store text online for a set period of time.
 commented Aug 19, 2019
This function is wrong. originalMessage has to be the message digest. Check out the manpage: https://www.openssl.org/docs/man1.1.1/man3/RSA_verify.html
 commented Aug 20, 2019
…On Tue, Aug 20, 2019 at 1:18 AM paxter ***@***.***> wrote: This function is wrong. originalMessage has to be the message digest. Check out the manpage: https://www.openssl.org/docs/man1.1.1/man3/RSA_verify.html — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub , or mute the thread  .
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