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author | rsc <devnull@localhost> | 2004-03-21 14:04:56 +0000 |
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committer | rsc <devnull@localhost> | 2004-03-21 14:04:56 +0000 |
commit | 0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4 (patch) | |
tree | dd9189a823998f494082adb769451f12be056566 /src/libsec/port/decodepem.c | |
parent | 768206abfcf505fb034a0151bf263bc0b1f2380c (diff) | |
download | plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.tar.gz plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.tar.bz2 plan9port-0fc65b37a1e7585ca2347bf61dcb8bc3a6b146a4.zip |
Add most of libsec.
Diffstat (limited to 'src/libsec/port/decodepem.c')
-rw-r--r-- | src/libsec/port/decodepem.c | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/libsec/port/decodepem.c b/src/libsec/port/decodepem.c new file mode 100644 index 00000000..194a4558 --- /dev/null +++ b/src/libsec/port/decodepem.c @@ -0,0 +1,61 @@ +#include <u.h> +#include <libc.h> +#include <mp.h> +#include <libsec.h> + +#define STRLEN(s) (sizeof(s)-1) + +uchar* +decodepem(char *s, char *type, int *len) +{ + uchar *d; + char *t, *e, *tt; + int n; + + *len = 0; + + /* + * find the correct section of the file, stripping garbage at the beginning and end. + * the data is delimited by -----BEGIN <type>-----\n and -----END <type>-----\n + */ + n = strlen(type); + e = strchr(s, '\0'); + for(t = s; t != nil && t < e; ){ + tt = t; + t = strchr(tt, '\n'); + if(t != nil) + t++; + if(strncmp(tt, "-----BEGIN ", STRLEN("-----BEGIN ")) == 0 + && strncmp(&tt[STRLEN("-----BEGIN ")], type, n) == 0 + && strncmp(&tt[STRLEN("-----BEGIN ")+n], "-----\n", STRLEN("-----\n")) == 0) + break; + } + for(tt = t; tt != nil && tt < e; tt++){ + if(strncmp(tt, "-----END ", STRLEN("-----END ")) == 0 + && strncmp(&tt[STRLEN("-----END ")], type, n) == 0 + && strncmp(&tt[STRLEN("-----END ")+n], "-----\n", STRLEN("-----\n")) == 0) + break; + tt = strchr(tt, '\n'); + if(tt == nil) + break; + } + if(tt == nil || tt == e){ + werrstr("incorrect .pem file format: bad header or trailer"); + return nil; + } + + n = ((tt - t) * 6 + 7) / 8; + d = malloc(n); + if(d == nil){ + werrstr("out of memory"); + return nil; + } + n = dec64(d, n, t, tt - t); + if(n < 0){ + free(d); + werrstr("incorrect .pem file format: bad base64 encoded data"); + return nil; + } + *len = n; + return d; +} |