diff options
author | Jason Wright <jason@cvs.openbsd.org> | 2002-05-10 15:45:19 +0000 |
---|---|---|
committer | Jason Wright <jason@cvs.openbsd.org> | 2002-05-10 15:45:19 +0000 |
commit | 7296c24b25daa7d6cf28350cc01bee9cc79c8e4a (patch) | |
tree | 48bf3beaa7919e2377c6369dcea261785a4f60b5 /sys/dev | |
parent | acf44f2f60abcb3f705efded5a01c66feea95609 (diff) |
Normalize base and exponent to the same length as the modulus and fail
if either base length or exponent length is greater than modulus.
Diffstat (limited to 'sys/dev')
-rw-r--r-- | sys/dev/pci/lofn.c | 85 |
1 files changed, 43 insertions, 42 deletions
diff --git a/sys/dev/pci/lofn.c b/sys/dev/pci/lofn.c index 37f90f48122..8edf5c1f7d6 100644 --- a/sys/dev/pci/lofn.c +++ b/sys/dev/pci/lofn.c @@ -1,4 +1,4 @@ -/* $OpenBSD: lofn.c,v 1.18 2002/05/10 15:25:39 jason Exp $ */ +/* $OpenBSD: lofn.c,v 1.19 2002/05/10 15:45:18 jason Exp $ */ /* * Copyright (c) 2001-2002 Jason L. Wright (jason@thought.net) @@ -333,8 +333,9 @@ lofn_modexp_start(sc, q) struct lofn_q *q; { struct cryptkop *krp = q->q_krp; - int ip = 0, bits, err = 0; + int ip = 0, err = 0; int mshift, eshift, nshift; + int mbits, ebits, nbits; if (krp->krp_param[LOFN_MODEXP_PAR_M].crp_nbits > 1024) { err = ERANGE; @@ -347,19 +348,47 @@ lofn_modexp_start(sc, q) lofn_zero_reg(sc, 2); lofn_zero_reg(sc, 3); + /* Write out N... */ + nbits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_N].crp_p, + krp->krp_param[LOFN_MODEXP_PAR_N].crp_nbits); + if (nbits > 1024) { + err = E2BIG; + goto errout; + } + if (nbits < 5) { + err = ERANGE; + goto errout; + } + bzero(&sc->sc_tmp, sizeof(sc->sc_tmp)); + bcopy(krp->krp_param[LOFN_MODEXP_PAR_N].crp_p, &sc->sc_tmp, + (nbits + 7) / 8); + lofn_write_reg(sc, 2, &sc->sc_tmp); + + nshift = 1024 - nbits; + WRITE_REG(sc, LOFN_LENADDR(LOFN_WIN_2, 2), 1024); + if (nshift != 0) { + WRITE_REG(sc, LOFN_REL_INSTR + ip, + LOFN_INSTR2(0, OP_CODE_SL, 2, 2, nshift)); + ip += 4; + + WRITE_REG(sc, LOFN_REL_INSTR + ip, + LOFN_INSTR2(0, OP_CODE_TAG, 2, 2, nbits)); + ip += 4; + } + /* Write out M... */ - bits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_M].crp_p, + mbits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_M].crp_p, krp->krp_param[LOFN_MODEXP_PAR_M].crp_nbits); - if (bits > 1024) { + if (mbits > 1024 || mbits > nbits) { err = E2BIG; goto errout; } bzero(&sc->sc_tmp, sizeof(sc->sc_tmp)); bcopy(krp->krp_param[LOFN_MODEXP_PAR_M].crp_p, &sc->sc_tmp, - (bits + 7) / 8); + (mbits + 7) / 8); lofn_write_reg(sc, 0, &sc->sc_tmp); - mshift = 1024 - bits; + mshift = 1024 - nbits; WRITE_REG(sc, LOFN_LENADDR(LOFN_WIN_2, 0), 1024); if (mshift != 0) { WRITE_REG(sc, LOFN_REL_INSTR + ip, @@ -367,27 +396,27 @@ lofn_modexp_start(sc, q) ip += 4; WRITE_REG(sc, LOFN_REL_INSTR + ip, - LOFN_INSTR2(0, OP_CODE_TAG, 0, 0, bits)); + LOFN_INSTR2(0, OP_CODE_TAG, 0, 0, nbits)); ip += 4; } /* Write out E... */ - bits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_E].crp_p, + ebits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_E].crp_p, krp->krp_param[LOFN_MODEXP_PAR_E].crp_nbits); - if (bits > 1024) { + if (ebits > 1024 || ebits > nbits) { err = E2BIG; goto errout; } - if (bits < 1) { + if (ebits < 1) { err = ERANGE; goto errout; } bzero(&sc->sc_tmp, sizeof(sc->sc_tmp)); bcopy(krp->krp_param[LOFN_MODEXP_PAR_E].crp_p, &sc->sc_tmp, - (bits + 7) / 8); + (ebits + 7) / 8); lofn_write_reg(sc, 1, &sc->sc_tmp); - eshift = 1024 - bits; + eshift = 1024 - nbits; WRITE_REG(sc, LOFN_LENADDR(LOFN_WIN_2, 1), 1024); if (eshift != 0) { WRITE_REG(sc, LOFN_REL_INSTR + ip, @@ -395,35 +424,7 @@ lofn_modexp_start(sc, q) ip += 4; WRITE_REG(sc, LOFN_REL_INSTR + ip, - LOFN_INSTR2(0, OP_CODE_TAG, 1, 1, bits)); - ip += 4; - } - - /* Write out N... */ - bits = lofn_norm_sigbits(krp->krp_param[LOFN_MODEXP_PAR_N].crp_p, - krp->krp_param[LOFN_MODEXP_PAR_N].crp_nbits); - if (bits > 1024) { - err = E2BIG; - goto errout; - } - if (bits < 5) { - err = ERANGE; - goto errout; - } - bzero(&sc->sc_tmp, sizeof(sc->sc_tmp)); - bcopy(krp->krp_param[LOFN_MODEXP_PAR_N].crp_p, &sc->sc_tmp, - (bits + 7) / 8); - lofn_write_reg(sc, 2, &sc->sc_tmp); - - nshift = 1024 - bits; - WRITE_REG(sc, LOFN_LENADDR(LOFN_WIN_2, 2), 1024); - if (nshift != 0) { - WRITE_REG(sc, LOFN_REL_INSTR + ip, - LOFN_INSTR2(0, OP_CODE_SL, 2, 2, nshift)); - ip += 4; - - WRITE_REG(sc, LOFN_REL_INSTR + ip, - LOFN_INSTR2(0, OP_CODE_TAG, 2, 2, bits)); + LOFN_INSTR2(0, OP_CODE_TAG, 1, 1, nbits)); ip += 4; } @@ -441,7 +442,7 @@ lofn_modexp_start(sc, q) ip += 4; WRITE_REG(sc, LOFN_REL_INSTR + ip, - LOFN_INSTR2(OP_DONE, OP_CODE_TAG, 3, 3, bits)); + LOFN_INSTR2(OP_DONE, OP_CODE_TAG, 3, 3, nbits)); ip += 4; } |