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more helpful error messages when rsa message and sig sizes exceed that of modulus

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This commit is contained in:
Sanjana Rajan 2018-06-13 13:06:07 +02:00
parent c83c81ca56
commit 0248604a96
1 changed files with 3 additions and 3 deletions
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6
src/crypto/public_key/rsa.js
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@ -57,7 +57,7 @@ export default {
*/ */
sign: async function(m, n, e, d) { sign: async function(m, n, e, d) {
if (n.cmp(m) <= 0) { if (n.cmp(m) <= 0) {
throw new Error('Data too large.'); throw new Error('Message size cannot exceed modulus size');
} }
const nred = new BN.red(n); const nred = new BN.red(n);
return m.toRed(nred).redPow(d).toArrayLike(Uint8Array, 'be', n.byteLength()); return m.toRed(nred).redPow(d).toArrayLike(Uint8Array, 'be', n.byteLength());
@ -73,7 +73,7 @@ export default {
*/ */
verify: async function(s, n, e) { verify: async function(s, n, e) {
if (n.cmp(s) <= 0) { if (n.cmp(s) <= 0) {
throw new Error('Data too large.'); throw new Error('Signature size cannot exceed modulus size');
} }
const nred = new BN.red(n); const nred = new BN.red(n);
return s.toRed(nred).redPow(e).toArrayLike(Uint8Array, 'be', n.byteLength()); return s.toRed(nred).redPow(e).toArrayLike(Uint8Array, 'be', n.byteLength());
@ -89,7 +89,7 @@ export default {
*/ */
encrypt: async function(m, n, e) { encrypt: async function(m, n, e) {
if (n.cmp(m) <= 0) { if (n.cmp(m) <= 0) {
throw new Error('Data too large.'); throw new Error('Message size cannot exceed modulus size');
} }
const nred = new BN.red(n); const nred = new BN.red(n);
return m.toRed(nred).redPow(e).toArrayLike(Uint8Array, 'be', n.byteLength()); return m.toRed(nred).redPow(e).toArrayLike(Uint8Array, 'be', n.byteLength());