| // SPDX-License-Identifier: BSD-2-Clause |
| /* LibTomCrypt, modular cryptographic library -- Tom St Denis |
| * |
| * LibTomCrypt is a library that provides various cryptographic |
| * algorithms in a highly modular and flexible manner. |
| * |
| * The library is free for all purposes without any express |
| * guarantee it works. |
| */ |
| #include "tomcrypt_private.h" |
| |
| /** |
| @file der_encode_octet_string.c |
| ASN.1 DER, encode a OCTET STRING, Tom St Denis |
| */ |
| |
| |
| #ifdef LTC_DER |
| |
| /** |
| Store an OCTET STRING |
| @param in The array of OCTETS to store (one per char) |
| @param inlen The number of OCTETS to store |
| @param out [out] The destination for the DER encoded OCTET STRING |
| @param outlen [in/out] The max size and resulting size of the DER OCTET STRING |
| @return CRYPT_OK if successful |
| */ |
| int der_encode_octet_string(const unsigned char *in, unsigned long inlen, |
| unsigned char *out, unsigned long *outlen) |
| { |
| unsigned long x, y, len; |
| int err; |
| |
| LTC_ARGCHK(in != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| /* get the size */ |
| if ((err = der_length_octet_string(inlen, &len)) != CRYPT_OK) { |
| return err; |
| } |
| |
| /* too big? */ |
| if (len > *outlen) { |
| *outlen = len; |
| return CRYPT_BUFFER_OVERFLOW; |
| } |
| |
| /* encode the header+len */ |
| x = 0; |
| out[x++] = 0x04; |
| len = *outlen - x; |
| if ((err = der_encode_asn1_length(inlen, out + x, &len)) != CRYPT_OK) { |
| return err; |
| } |
| x += len; |
| |
| /* store octets */ |
| for (y = 0; y < inlen; y++) { |
| out[x++] = in[y]; |
| } |
| |
| /* retun length */ |
| *outlen = x; |
| |
| return CRYPT_OK; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |