Mercurial > dropbear
view libtomcrypt/src/stream/rc4/rc4_stream.c @ 1659:d32bcb5c557d
Add Ed25519 support (#91)
* Add support for Ed25519 as a public key type
Ed25519 is a elliptic curve signature scheme that offers
better security than ECDSA and DSA and good performance. It may be
used for both user and host keys.
OpenSSH key import and fuzzer are not supported yet.
Initially inspired by Peter Szabo.
* Add curve25519 and ed25519 fuzzers
* Add import and export of Ed25519 keys
author | Vladislav Grishenko <themiron@users.noreply.github.com> |
---|---|
date | Wed, 11 Mar 2020 21:09:45 +0500 |
parents | 6dba84798cd5 |
children |
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/* 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.h" #ifdef LTC_RC4_STREAM /** Initialize an RC4 context (only the key) @param st [out] The destination of the RC4 state @param key The secret key @param keylen The length of the secret key (8 - 256 bytes) @return CRYPT_OK if successful */ int rc4_stream_setup(rc4_state *st, const unsigned char *key, unsigned long keylen) { unsigned char tmp, *s; int x, y; unsigned long j; LTC_ARGCHK(st != NULL); LTC_ARGCHK(key != NULL); LTC_ARGCHK(keylen >= 5); /* 40-2048 bits */ s = st->buf; for (x = 0; x < 256; x++) { s[x] = x; } for (j = x = y = 0; x < 256; x++) { y = (y + s[x] + key[j++]) & 255; if (j == keylen) { j = 0; } tmp = s[x]; s[x] = s[y]; s[y] = tmp; } st->x = 0; st->y = 0; return CRYPT_OK; } /** Encrypt (or decrypt) bytes of ciphertext (or plaintext) with RC4 @param st The RC4 state @param in The plaintext (or ciphertext) @param inlen The length of the input (octets) @param out [out] The ciphertext (or plaintext), length inlen @return CRYPT_OK if successful */ int rc4_stream_crypt(rc4_state *st, const unsigned char *in, unsigned long inlen, unsigned char *out) { unsigned char x, y, *s, tmp; LTC_ARGCHK(st != NULL); LTC_ARGCHK(in != NULL); LTC_ARGCHK(out != NULL); x = st->x; y = st->y; s = st->buf; while (inlen--) { x = (x + 1) & 255; y = (y + s[x]) & 255; tmp = s[x]; s[x] = s[y]; s[y] = tmp; tmp = (s[x] + s[y]) & 255; *out++ = *in++ ^ s[tmp]; } st->x = x; st->y = y; return CRYPT_OK; } /** Generate a stream of random bytes via RC4 @param st The RC420 state @param out [out] The output buffer @param outlen The output length @return CRYPT_OK on success */ int rc4_stream_keystream(rc4_state *st, unsigned char *out, unsigned long outlen) { if (outlen == 0) return CRYPT_OK; /* nothing to do */ LTC_ARGCHK(out != NULL); XMEMSET(out, 0, outlen); return rc4_stream_crypt(st, out, outlen, out); } /** Terminate and clear RC4 state @param st The RC4 state @return CRYPT_OK on success */ int rc4_stream_done(rc4_state *st) { LTC_ARGCHK(st != NULL); XMEMSET(st, 0, sizeof(rc4_state)); return CRYPT_OK; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */