Linking problems in compiling a simple RSA encryption C code -
i have included code using learn rsa encryption , decryption, when try compile using command gcc rsa.c -lcrypto -lssl throws linking errors.
#include <openssl/pem.h> #include <openssl/ssl.h> #include <openssl/rsa.h> #include <openssl/evp.h> #include <openssl/bio.h> #include <openssl/err.h> #include <stdio.h> int padding = rsa_pkcs1_padding; rsa * creatersa(unsigned char * key,int public) { rsa *rsa= null; bio *keybio ; keybio = bio_new_mem_buf(key, -1); if (keybio==null) { printf( "failed create key bio"); return 0; } if(public) { rsa = pem_read_bio_rsa_pubkey(keybio, &rsa,null, null); } else { rsa = pem_read_bio_rsaprivatekey(keybio, &rsa,null, null); } if(rsa == null) { printf( "failed create rsa"); } return rsa; } int public_encrypt(unsigned char * data,int data_len,unsigned char * key, unsigned char *encrypted) { rsa * rsa = creatersa(key,1); int result = rsa_public_encrypt(data_len,data,encrypted,rsa,padding); return result; } int private_decrypt(unsigned char * enc_data,int data_len,unsigned char * key, unsigned char *decrypted) { rsa * rsa = creatersa(key,0); int result = rsa_private_decrypt(data_len,enc_data,decrypted,rsa,padding); return result; } int private_encrypt(unsigned char * data,int data_len,unsigned char * key, unsigned char *encrypted) { rsa * rsa = creatersa(key,0); int result = rsa_private_encrypt(data_len,data,encrypted,rsa,padding); return result; } int public_decrypt(unsigned char * enc_data,int data_len,unsigned char * key, unsigned char *decrypted) { rsa * rsa = creatersa(key,1); int result = rsa_public_decrypt(data_len,enc_data,decrypted,rsa,padding); return result; } int main(void){ char plaintext[2048/8] = "hello ravi"; //key length : 2048 char publickey[]="-----begin public key-----\n"\ "miibijanbgkqhkig9w0baqefaaocaq8amiibcgkcaqeay8dbv8prpj/0kkhlgejy\n"\ "ozo2t60eg8l0561g13r29lvmr5hyvgzlgjpmn65+a4xhxinjyipukzrkunapelz+\n"\ "vw1hocoaztwk0z3r26ua8kqyokx9qt/dbcdvsf9wf8grk0ptx9m6r13nvbxvvqap\n"\ "fc9jb9ntzphogm4jieyvlv8flhg9yzovmyd6wwf3aoxk891vqxtr/kqyoq1yp+68\n"\ "i6t4nnq7nwc+unvjqhxnqmqmzu6lwcx8zyg3yh88oaqkuxixkfq+nkvyq1cxamov\n"\ "ppy72+evthkzpmeyhkbn7ciumk5qgltejafwzpe4f4efzj/rc8y8jj2is5kvpjuy\n"\ "wqidaqab\n"\ "-----end public key-----\n"; char privatekey[]="-----begin rsa private key-----\n"\ "miieowibaakcaqeay8dbv8prpj/0kkhlgejyozo2t60eg8l0561g13r29lvmr5hy\n"\ "vgzlgjpmn65+a4xhxinjyipukzrkunapelz+vw1hocoaztwk0z3r26ua8kqyokx9\n"\ "qt/dbcdvsf9wf8grk0ptx9m6r13nvbxvvqapfc9jb9ntzphogm4jieyvlv8flhg9\n"\ "yzovmyd6wwf3aoxk891vqxtr/kqyoq1yp+68i6t4nnq7nwc+unvjqhxnqmqmzu6l\n"\ "wcx8zyg3yh88oaqkuxixkfq+nkvyq1cxamovppy72+evthkzpmeyhkbn7ciumk5q\n"\ "gltejafwzpe4f4efzj/rc8y8jj2is5kvpjuywqidaqabaoibadhg1u1mv1haalx8\n"\ "omz1gn2f4aaw2aos2cm5udcnw1symj+9srikaxjrse/c4o9sw1oxrg1/z6kajv0e\n"\ "n/t008fdlvkhxaiywf93jmovvipmmt8jft6an/y3nmpivgt2inmmejzyniofjkzg\n"\ "x+/vkyvsviszm2fw8nfnkvaqk55yu+grwbzgoes9k+lbyvowcrjkhhz66m4bedkd\n"\ "gvaix6ne5iwmjnxktsqljmcjbtdnxg/xo1/g4kg2p/mo1hlckfe1n5fgbixj3qjl\n"\ "vgvjjzkh1as2ktgapobqzap03738vnyg23isyvft/tearvgtxrmfp7939evjfkpf\n"\ "1wtxudkcgyea7t0dr37zt+dejy+5vm7zsmn97venwqjfwmiulkhga0yu3llasxxu\n"\ "m0outndijenivsx6t3y+agk2f3epbb0az5wz1p1ixs4vktgeqwssbdqcm8lzfdvz\n"\ "upboqnjordikd62xnp5ekieibafop8v2wfpsfe7nnh2u4cpaxnsf9hscgyea2l8d\n"\ "jrde5m9kkn+j4l+adgfebl1igpf3dnupov67bpgiaagi4h25ujzxidkkoa706s0d\n"\ "4xb74zolx11magpmidhlg+sgeqfnoc5le4zwxnyesjh1svgrgt9nbc2vtl6bxcvv\n"\ "wbktec5d6c/qxcai6yw6oyynndp0uznkure1xvmcgybvyycejwqmuavyferfgv+5\n"\ "nwqr5gm+yjmfm2bequpd/hhsloeimm2o8kikvwseryznohktdz7fwgzyxr8fgmog\n"\ "pxq1vk9dxcvzl4trpvau5rmknud9hg9dqg6xibgidr+f79sb8qjywmcfgc1sywoa\n"\ "skjlykz2yt4xnqi3bfid9qkbggqlgryxmxp1qovibrawui55nzhg1xbkwzqpxvz1\n"\ "i3umlv1jljjlhk3eukqtpmc05hoapkwshea0/gobmg404xyayjtdccidtg6hlf96\n"\ "zbja3xapzuxqm62f6dv4fqqzfx0wwhwp5n301n33r0qr6fummkjzmvj1ta8tmzef\n"\ "yinraogbajqioys8rk6exza8ywyljqtlu/yqslbn/4ta36k8dycolnlnxsuox+a5\n"\ "w6z2vefrvqdq4hm4vbzjdi3qfylnktitqlcvgwz+ex44ogxtdtdo7c+gemkwz4xx\n"\ "ujsuvl5+cvjkljzej6qc2wzll94xswl71e41h4ycivnscqxvc4jw\n"\ "-----end rsa private key-----\n"; unsigned char encrypted[4098]={}; unsigned char decrypted[4098]={}; int encrypted_length= public_encrypt(plaintext,strlen(plaintext),publickey,encrypted); printf("encrypted length =%d\n",encrypted_length); int decrypted_length = private_decrypt(encrypted,encrypted_length,privatekey, decrypted); printf("decrypted text =%s\n",decrypted); printf("decrypted length =%d\n",decrypted_length); encrypted_length= private_encrypt(plaintext,strlen(plaintext),privatekey,encrypted); printf("encrypted length =%d\n",encrypted_length); printf("decrypted text =%s\n",decrypted); printf("decrypted length =%d\n",decrypted_length); } linking errors follows:
/usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 0 has invalid symbol index 11 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 1 has invalid symbol index 12 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 2 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 3 has invalid symbol index 2 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 4 has invalid symbol index 11 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 5 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 6 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 7 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 8 has invalid symbol index 12 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 9 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 10 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 11 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 12 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 13 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 14 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 15 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 16 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 17 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 18 has invalid symbol index 13 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_info): relocation 19 has invalid symbol index 21 /usr/bin/ld: /usr/lib/debug/usr/lib/x86_64-linux-gnu/crt1.o(.debug_line): relocation 0 has invalid symbol index 2 /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../x86_64-linux-gnu/crt1.o: in function `_start': (.text+0x20): undefined reference `main' collect2: error: ld returned 1 exit status i have ensured use flags , include relevant header files, still dont know why there linking error.
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