Mercurial > dropbear
view libtomcrypt/src/mac/poly1305/poly1305_memory_multi.c @ 1844:7a3cd7b598d8
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author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 18 Oct 2021 23:31:23 +0800 |
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. */ /* The implementation is based on: * Public Domain poly1305 from Andrew Moon * https://github.com/floodyberry/poly1305-donna */ #include "tomcrypt.h" #include <stdarg.h> #ifdef LTC_POLY1305 /** POLY1305 multiple blocks of memory to produce the authentication tag @param key The secret key @param keylen The length of the secret key (octets) @param mac [out] Destination of the authentication tag @param maclen [in/out] Max size and resulting size of authentication tag @param in The data to POLY1305 @param inlen The length of the data to POLY1305 (octets) @param ... tuples of (data,len) pairs to POLY1305, terminated with a (NULL,x) (x=don't care) @return CRYPT_OK if successful */ int poly1305_memory_multi(const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen, const unsigned char *in, unsigned long inlen, ...) { poly1305_state st; int err; va_list args; const unsigned char *curptr; unsigned long curlen; LTC_ARGCHK(key != NULL); LTC_ARGCHK(in != NULL); LTC_ARGCHK(mac != NULL); LTC_ARGCHK(maclen != NULL); va_start(args, inlen); curptr = in; curlen = inlen; if ((err = poly1305_init(&st, key, keylen)) != CRYPT_OK) { goto LBL_ERR; } for (;;) { if ((err = poly1305_process(&st, curptr, curlen)) != CRYPT_OK) { goto LBL_ERR; } curptr = va_arg(args, const unsigned char*); if (curptr == NULL) break; curlen = va_arg(args, unsigned long); } err = poly1305_done(&st, mac, maclen); LBL_ERR: #ifdef LTC_CLEAN_STACK zeromem(&st, sizeof(poly1305_state)); #endif va_end(args); return err; } #endif /* ref: $Format:%D$ */ /* git commit: $Format:%H$ */ /* commit time: $Format:%ai$ */