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/*
* CRAM-MD5 (RFC 2195) compatibility code
* Copyright (c) 2003 Joshua Goodall <joshua@roughtrade.net>
*
* This software is released under the MIT license.
*/
#include "lib.h"
#include "md5.h"
#include "hmac-cram-md5.h"
void hmac_md5_get_cram_context(struct hmac_context *_hmac_ctx,
unsigned char context_digest[CRAM_MD5_CONTEXTLEN])
{
struct hmac_context_priv *hmac_ctx = &_hmac_ctx->u.priv;
unsigned char *cdp;
struct md5_context *ctx = (void*)hmac_ctx->ctx;
struct md5_context *ctxo = (void*)hmac_ctx->ctxo;
#define CDPUT(p, c) STMT_START { \
*(p)++ = (c) & 0xff; \
*(p)++ = (c) >> 8 & 0xff; \
*(p)++ = (c) >> 16 & 0xff; \
*(p)++ = (c) >> 24 & 0xff; \
} STMT_END
cdp = context_digest;
CDPUT(cdp, ctxo->a);
CDPUT(cdp, ctxo->b);
CDPUT(cdp, ctxo->c);
CDPUT(cdp, ctxo->d);
CDPUT(cdp, ctx->a);
CDPUT(cdp, ctx->b);
CDPUT(cdp, ctx->c);
CDPUT(cdp, ctx->d);
}
void hmac_md5_set_cram_context(struct hmac_context *_hmac_ctx,
const unsigned char context_digest[CRAM_MD5_CONTEXTLEN])
{
struct hmac_context_priv *hmac_ctx = &_hmac_ctx->u.priv;
const unsigned char *cdp;
struct md5_context *ctx = (void*)hmac_ctx->ctx;
struct md5_context *ctxo = (void*)hmac_ctx->ctxo;
#define CDGET(p, c) STMT_START { \
(c) = (*p++); \
(c) += (*p++ << 8); \
(c) += (*p++ << 16); \
(c) += ((uint32_t)(*p++) << 24); \
} STMT_END
cdp = context_digest;
CDGET(cdp, ctxo->a);
CDGET(cdp, ctxo->b);
CDGET(cdp, ctxo->c);
CDGET(cdp, ctxo->d);
CDGET(cdp, ctx->a);
CDGET(cdp, ctx->b);
CDGET(cdp, ctx->c);
CDGET(cdp, ctx->d);
ctxo->lo = ctx->lo = 64;
ctxo->hi = ctx->hi = 0;
}
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