| 1 | /** |
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| 2 | ** abac_m64.c |
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| 3 | **/ |
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| 4 | |
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| 5 | #include <stdio.h> |
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| 6 | #include <stdlib.h> |
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| 7 | #include <string.h> |
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| 8 | #include <assert.h> |
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| 9 | |
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| 10 | #include <credentials/certificates/certificate.h> |
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| 11 | |
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| 12 | #include "zlib.h" |
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| 13 | #define CHUNK 1024 /* 16384 */ |
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| 14 | |
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| 15 | static int debug=0; |
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| 16 | static int zip=1; /* to choose to compress/decompress */ |
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| 17 | |
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| 18 | /* |
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| 19 | using strongswan's m64 utility so we can stay within the |
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| 20 | buf len size that strongwan set in using its certifiate |
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| 21 | generation code (512) |
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| 22 | chunk_t b64 = chunk_to_base64(chunk, NULL); |
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| 23 | chunk_t chk = chunk_from_base64(base64, NULL); |
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| 24 | */ |
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| 25 | |
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| 26 | static int _compress(char *string, int ilen, char*ostring) |
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| 27 | { |
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| 28 | int olen=CHUNK; |
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| 29 | int rc=compress(ostring,&olen,string,ilen); |
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| 30 | if(rc==Z_OK) { |
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| 31 | if(debug) fprintf(stderr,"compress from %d to %d\n", ilen, olen); |
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| 32 | return olen; |
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| 33 | } |
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| 34 | return 0; |
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| 35 | } |
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| 36 | |
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| 37 | /* all of these are deep copy of a string */ |
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| 38 | char* abac_encode_string(char *string) |
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| 39 | { |
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| 40 | assert(string); |
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| 41 | char *ret=NULL; |
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| 42 | char *ptr=string;; |
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| 43 | int len=strlen(ptr); |
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| 44 | char ostring[CHUNK]; |
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| 45 | if(zip) { |
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| 46 | int olen=_compress(ptr, len, ostring); |
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| 47 | if(olen==0) { /* can not do the compress */ |
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| 48 | return NULL; |
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| 49 | } else { |
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| 50 | ptr=ostring; |
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| 51 | len=olen; |
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| 52 | } |
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| 53 | } |
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| 54 | chunk_t orig = { ptr, len }; |
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| 55 | chunk_t b64 = chunk_to_base64(orig, NULL); |
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| 56 | if(debug) fprintf(stderr,"abac_encode_string: (%s)\n",b64.ptr); |
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| 57 | ret=strndup(b64.ptr,b64.len); |
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| 58 | chunk_free(&b64); |
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| 59 | return ret; |
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| 60 | } |
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| 61 | |
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| 62 | static int _uncompress(char *string, int ilen, char *ostring) |
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| 63 | { |
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| 64 | int olen=CHUNK; |
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| 65 | int rc=uncompress(ostring,&olen,string,ilen); |
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| 66 | if(rc==Z_OK) { |
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| 67 | if(debug) fprintf(stderr,"uncompress from %d to %d\n", ilen, olen); |
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| 68 | return olen; |
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| 69 | } |
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| 70 | return 0; |
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| 71 | } |
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| 72 | |
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| 73 | char* abac_decode_string(char *string) |
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| 74 | { |
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| 75 | assert(string); |
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| 76 | |
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| 77 | char *ret=NULL; |
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| 78 | int len=strlen(string); |
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| 79 | chunk_t b64 = { string, len }; |
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| 80 | chunk_t chk= chunk_from_base64(b64, NULL); |
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| 81 | |
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| 82 | if(debug) fprintf(stderr,"abac_decode_string: (%s)\n",chk.ptr); |
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| 83 | |
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| 84 | if(zip) { |
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| 85 | char ostring[CHUNK]; |
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| 86 | int olen=_uncompress(chk.ptr, chk.len, ostring); |
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| 87 | if(olen==0) { /* unable to uncompress the string!! */ |
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| 88 | ret=NULL; |
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| 89 | } else ret=strndup(ostring,olen); |
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| 90 | } else { |
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| 91 | ret=strndup(chk.ptr, chk.len); |
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| 92 | } |
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| 93 | chunk_free(&chk); |
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| 94 | return ret; |
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| 95 | } |
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| 96 | |
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