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Code Issues 1 Releases Wiki Activity

Fix NewHope verify

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https://github.com/mupq/pqm4/issues/132 repoorted that the NewHope verify function does not actually return 0 or 1, but 0 or -1, which consequenctly breaks the cmov in the FO transform.
This bug was introduced when I integrated this into PQClean.
This commit is contained in:
Matthias J. Kannwischer 2020-02-15 10:27:56 +01:00 committed by Kris Kwiatkowski
parent 5a4b5f7358
commit e93a6bef1f
8 changed files with 8 additions and 8 deletions
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2
crypto_kem/newhope1024cca/clean/reduce.c
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@ -5,7 +5,7 @@ static const uint32_t qinv = 12287; // -inverse_mod(p,2^18)
static const uint32_t rlog = 18; static const uint32_t rlog = 18;
/************************************************* /*************************************************
* Name: verify * Name: montgomery_reduce
* *
* Description: Montgomery reduction; given a 32-bit integer a, computes * Description: Montgomery reduction; given a 32-bit integer a, computes
* 16-bit integer congruent to a * R^-1 mod q, * 16-bit integer congruent to a * R^-1 mod q,

2
crypto_kem/newhope1024cca/clean/verify.c
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@ -22,7 +22,7 @@ int PQCLEAN_NEWHOPE1024CCA_CLEAN_verify(const unsigned char *a, const unsigned c
r |= a[i] ^ b[i]; r |= a[i] ^ b[i];
} }
r = (-(int64_t)r) >> 63; r = (-r) >> 63;
return (int)r; return (int)r;
} }

2
crypto_kem/newhope1024cpa/clean/reduce.c
View File

@ -5,7 +5,7 @@ static const uint32_t qinv = 12287; // -inverse_mod(p,2^18)
static const uint32_t rlog = 18; static const uint32_t rlog = 18;
/************************************************* /*************************************************
* Name: verify * Name: montgomery_reduce
* *
* Description: Montgomery reduction; given a 32-bit integer a, computes * Description: Montgomery reduction; given a 32-bit integer a, computes
* 16-bit integer congruent to a * R^-1 mod q, * 16-bit integer congruent to a * R^-1 mod q,

2
crypto_kem/newhope1024cpa/clean/verify.c
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@ -22,7 +22,7 @@ int PQCLEAN_NEWHOPE1024CPA_CLEAN_verify(const unsigned char *a, const unsigned c
r |= a[i] ^ b[i]; r |= a[i] ^ b[i];
} }
r = (-(int64_t)r) >> 63; r = (-r) >> 63;
return (int)r; return (int)r;
} }

2
crypto_kem/newhope512cca/clean/reduce.c
View File

@ -5,7 +5,7 @@ static const uint32_t qinv = 12287; // -inverse_mod(p,2^18)
static const uint32_t rlog = 18; static const uint32_t rlog = 18;
/************************************************* /*************************************************
* Name: verify * Name: montgomery_reduce
* *
* Description: Montgomery reduction; given a 32-bit integer a, computes * Description: Montgomery reduction; given a 32-bit integer a, computes
* 16-bit integer congruent to a * R^-1 mod q, * 16-bit integer congruent to a * R^-1 mod q,

2
crypto_kem/newhope512cca/clean/verify.c
View File

@ -22,7 +22,7 @@ int PQCLEAN_NEWHOPE512CCA_CLEAN_verify(const unsigned char *a, const unsigned ch
r |= a[i] ^ b[i]; r |= a[i] ^ b[i];
} }
r = (-(int64_t)r) >> 63; r = (-r) >> 63;
return (int)r; return (int)r;
} }

2
crypto_kem/newhope512cpa/clean/reduce.c
View File

@ -5,7 +5,7 @@ static const uint32_t qinv = 12287; // -inverse_mod(p,2^18)
static const uint32_t rlog = 18; static const uint32_t rlog = 18;
/************************************************* /*************************************************
* Name: verify * Name: montgomery_reduce
* *
* Description: Montgomery reduction; given a 32-bit integer a, computes * Description: Montgomery reduction; given a 32-bit integer a, computes
* 16-bit integer congruent to a * R^-1 mod q, * 16-bit integer congruent to a * R^-1 mod q,

2
crypto_kem/newhope512cpa/clean/verify.c
View File

@ -22,7 +22,7 @@ int PQCLEAN_NEWHOPE512CPA_CLEAN_verify(const unsigned char *a, const unsigned ch
r |= a[i] ^ b[i]; r |= a[i] ^ b[i];
} }
r = (-(int64_t)r) >> 63; r = (-r) >> 63;
return (int)r; return (int)r;
} }