| // 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 base16_encode.c |
| Base16/Hex encode a string, Steffen Jaeckel |
| */ |
| |
| #ifdef LTC_BASE16 |
| |
| /** |
| Base16 encode a buffer |
| @param in The input buffer to encode |
| @param inlen The length of the input buffer |
| @param out [out] The destination of the Base16 encoded data |
| @param outlen [in/out] The max size and resulting size of the encoded data |
| @param options Output 'a-f' on 0 and 'A-F' otherwise. |
| @return CRYPT_OK if successful |
| */ |
| int base16_encode(const unsigned char *in, unsigned long inlen, |
| char *out, unsigned long *outlen, |
| unsigned int options) |
| { |
| unsigned long i, x; |
| const char *alphabet; |
| const char *alphabets[2] = { |
| "0123456789abcdef", |
| "0123456789ABCDEF", |
| }; |
| |
| LTC_ARGCHK(in != NULL); |
| LTC_ARGCHK(out != NULL); |
| LTC_ARGCHK(outlen != NULL); |
| |
| /* check the sizes */ |
| x = inlen * 2 + 1; |
| |
| if (x < inlen) return CRYPT_OVERFLOW; |
| |
| if (*outlen < x) { |
| *outlen = x; |
| return CRYPT_BUFFER_OVERFLOW; |
| } |
| x--; |
| *outlen = x; /* returning the length without terminating NUL */ |
| |
| if (options == 0) { |
| alphabet = alphabets[0]; |
| } else { |
| alphabet = alphabets[1]; |
| } |
| |
| for (i = 0; i < x; i += 2) { |
| out[i] = alphabet[(in[i/2] >> 4) & 0x0f]; |
| out[i+1] = alphabet[in[i/2] & 0x0f]; |
| } |
| out[x] = '\0'; |
| |
| return CRYPT_OK; |
| } |
| |
| #endif |
| |
| /* ref: $Format:%D$ */ |
| /* git commit: $Format:%H$ */ |
| /* commit time: $Format:%ai$ */ |