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7198901: correct the field size check when decoding a point on ECC curve

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Reviewed-by: xuelei
This commit is contained in:
Vinnie Ryan 2012-09-18 11:08:48 +01:00
parent 89a8feeaff
commit 79b3216615
1 changed files with 4 additions and 2 deletions
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6
jdk/src/share/classes/sun/security/ec/ECParameters.java
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@ -87,8 +87,10 @@ public final class ECParameters extends AlgorithmParametersSpi {
if ((data.length == 0) || (data[0] != 4)) {
throw new IOException("Only uncompressed point format supported");
}
int n = data.length / 2;
if (n > ((curve.getField().getFieldSize() + 7 ) >> 3)) {
// Per ANSI X9.62, an encoded point is a 1 byte type followed by
// ceiling(log base 2 field-size / 8) bytes of x and the same of y.
int n = (data.length - 1) / 2;
if (n != ((curve.getField().getFieldSize() + 7 ) >> 3)) {
throw new IOException("Point does not match field size");
}
byte[] xb = new byte[n];