diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/libstrongswan/plugins/openssl/openssl_util.c | 18 | ||||
| -rw-r--r-- | src/libstrongswan/plugins/openssl/openssl_util.h | 9 |
2 files changed, 27 insertions, 0 deletions
diff --git a/src/libstrongswan/plugins/openssl/openssl_util.c b/src/libstrongswan/plugins/openssl/openssl_util.c index bc10dd28c..0e61086b1 100644 --- a/src/libstrongswan/plugins/openssl/openssl_util.c +++ b/src/libstrongswan/plugins/openssl/openssl_util.c @@ -126,6 +126,24 @@ bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b) /** * Described in header. */ +bool openssl_bn2chunk(BIGNUM *bn, chunk_t *chunk) +{ + *chunk = chunk_alloc(BN_num_bytes(bn)); + if (BN_bn2bin(bn, chunk->ptr) == chunk->len) + { + if (chunk->len && chunk->ptr[0] & 0x80) + { /* if MSB is set, prepend a zero to make it non-negative */ + *chunk = chunk_cat("cm", chunk_from_chars(0x00), *chunk); + } + return TRUE; + } + chunk_free(chunk); + return FALSE; +} + +/** + * Described in header. + */ chunk_t openssl_asn1_obj2chunk(ASN1_OBJECT *asn1) { if (asn1) diff --git a/src/libstrongswan/plugins/openssl/openssl_util.h b/src/libstrongswan/plugins/openssl/openssl_util.h index 25c692a1a..ce2a9e109 100644 --- a/src/libstrongswan/plugins/openssl/openssl_util.h +++ b/src/libstrongswan/plugins/openssl/openssl_util.h @@ -66,6 +66,15 @@ bool openssl_bn_cat(int len, BIGNUM *a, BIGNUM *b, chunk_t *chunk); */ bool openssl_bn_split(chunk_t chunk, BIGNUM *a, BIGNUM *b); +/** + * Exports the given bignum (assumed to be a positive number) to a chunk in + * two's complement format (i.e. a zero byte is added if the MSB is set). + * + * @param bn the BIGNUM to export + * @param chunk the chunk (data gets allocated) + * @return TRUE on success, FALSE otherwise + */ +bool openssl_bn2chunk(BIGNUM *bn, chunk_t *chunk); /** * Allocate a chunk using the i2d function of a given object |