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| /* | ||
| * @f ccnl-ext-crypto.c | ||
| * @b CCN lite extension, crypto logic (sign, verify, encrypt, decrypt) | ||
| * | ||
| * Copyright (C) 2012-13, Christian Tschudin, University of Basel | ||
| * | ||
| * Permission to use, copy, modify, and/or distribute this software for any | ||
| * purpose with or without fee is hereby granted, provided that the above | ||
| * copyright notice and this permission notice appear in all copies. | ||
| * | ||
| * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | ||
| * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | ||
| * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | ||
| * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | ||
| * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | ||
| * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | ||
| * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | ||
| * | ||
| * File history: | ||
| * 2012-10-03 created | ||
| */ | ||
|
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| #ifdef CCNL_USE_MGMT_SIGNATUES | ||
| #ifndef CCNL_LINUXKERNEL | ||
| #include <openssl/sha.h> | ||
| #include <openssl/rsa.h> | ||
| #include <openssl/objects.h> | ||
| #include <openssl/err.h> | ||
| #endif | ||
| #endif /*CCNL_USE_MGMT_SIGNATUES*/ | ||
|
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| #ifdef CCNL_USE_MGMT_SIGNATUES | ||
| int sha1(void* input, unsigned long length, unsigned char* md) | ||
| { | ||
| #ifndef CCNL_LINUXKERNEL | ||
| SHA_CTX context; | ||
| if(!SHA1_Init(&context)) | ||
| return 0; | ||
|
|
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| if(!SHA1_Update(&context, (unsigned char*)input, length)) | ||
| return 0; | ||
|
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| if(!SHA1_Final(md, &context)) | ||
| return 0; | ||
|
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| return 1; | ||
| #endif | ||
| } | ||
|
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| int sign(char* private_key_path, char *msg, int msg_len, char *sig, int *sig_len) | ||
| { | ||
| #ifndef CCNL_LINUXKERNEL | ||
| //Load private key | ||
| FILE *fp = fopen(private_key_path, "r"); | ||
| if(!fp) { | ||
| printf("Could not find private key\n"); | ||
| return 0; | ||
| } | ||
| RSA *rsa = (RSA *) PEM_read_RSAPrivateKey(fp,NULL,NULL,NULL); | ||
| fclose(fp); | ||
| if(!rsa) return 0; | ||
|
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| unsigned char md[SHA_DIGEST_LENGTH]; | ||
| sha1(msg, msg_len, md); | ||
|
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| //Compute signatur | ||
| int err = RSA_sign(NID_sha1, md, SHA_DIGEST_LENGTH, sig, sig_len, rsa); | ||
| if(!err){ | ||
| DEBUGMSG(99,"Error: %d\n", ERR_get_error()); | ||
| } | ||
| RSA_free(rsa); | ||
| return err; | ||
| #else | ||
| return 0; | ||
| #endif | ||
| } | ||
|
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| int verify(char* public_key_path, char *msg, int msg_len, char *sig, int sig_len) | ||
| { | ||
|
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| #ifndef CCNL_LINUXKERNEL | ||
| //Load public key | ||
| FILE *fp = fopen(public_key_path, "r"); | ||
| unsigned char md[SHA_DIGEST_LENGTH]; | ||
| if(!fp) { | ||
| printf("Could not find public key\n"); | ||
| return 0; | ||
| } | ||
| RSA *rsa = (RSA *) PEM_read_RSA_PUBKEY(fp, NULL, NULL, NULL); | ||
| if(!rsa) return 0; | ||
| fclose(fp); | ||
|
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| //Compute Hash | ||
|
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| sha1(msg, msg_len, md); | ||
| //Verify signature | ||
| int verified = RSA_verify(NID_sha1, md, SHA_DIGEST_LENGTH, sig, sig_len, rsa); | ||
| RSA_free(rsa); | ||
| return verified; | ||
| #else | ||
| return 0; | ||
| #endif | ||
| } | ||
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|
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| int add_signature(unsigned char *out, char *private_key_path, char *file, int fsize) | ||
| { | ||
| int len; | ||
|
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| unsigned char *sig = (unsigned char *)ccnl_malloc(sizeof(char)*4096); | ||
| int sig_len; | ||
|
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| len = mkHeader(out, CCN_DTAG_SIGNATURE, CCN_TT_DTAG); | ||
| len += mkStrBlob(out + len, CCN_DTAG_NAME, CCN_TT_DTAG, "SHA256"); | ||
| len += mkStrBlob(out + len, CCN_DTAG_WITNESS, CCN_TT_DTAG, ""); | ||
|
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| if(!sign(private_key_path, file, fsize, sig, &sig_len)) return 0; | ||
| //DEBUGMSG(99, "SIGLEN: %d\n",sig_len); | ||
| sig[sig_len]=0; | ||
|
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| //add signaturebits bits... | ||
| len += mkHeader(out + len, CCN_DTAG_SIGNATUREBITS, CCN_TT_DTAG); | ||
| len += addBlob(out + len, sig, sig_len); | ||
| out[len++] = 0; // end signaturebits | ||
|
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| out[len++] = 0; // end signature | ||
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| /*char *publickey = "/home/blacksheeep/.ssh/publickey.pem"; | ||
| int verified = verify(publickey, file, fsize, sig, sig_len); | ||
| printf("Verified: %d\n", verified);*/ | ||
| ccnl_free(sig); | ||
| return len; | ||
| } | ||
| #endif /*CCNL_USE_MGMT_SIGNATUES*/ |
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